Patent Publication Number: US-10781022-B2

Title: Easy opening packaging article made from heat-shrinkable film exhibiting directional tear

Description:
This application claims the benefit of provisional application U.S. Ser. No. 60/931,270 filed 21 May 2007, and non-provisional application U.S. Ser. No. 11/895,960, filed 28 Aug. 2007, non-provisional application US 2008/00644, filed 20 May 2008, and non-provisional application Ser. No. 12/313,396 filed 20 Nov. 2008 each of which is incorporated, in its entirety, by reference thereto. 
    
    
     FIELD 
     The present invention pertains to heat-shrinkable packaging articles that are easy to open, particularly packaging articles for food packaging end use. 
     BACKGROUND 
     For several decades, heat-shrinkable packaging articles have been used for the packaging of a variety of products. Food, particularly meat, has been vacuum packaged in such packaging articles. Through the years, these heat-shrinkable packaging articles have developed higher impact strength and higher seal strength, while simultaneously becoming easier to seal, having improved oxygen and moisture barrier properties, and having higher total free shrink at lower temperatures. High seal strength, high impact strength, and high puncture-resistance are particularly important for the packaging of fresh meat products, as leaking packages are less desirable to consumers and retailers alike. Moreover, leaking packages reduce shelf life by allowing atmospheric oxygen and microbes to enter the package. 
     As a result, the packaging articles used for food packaging, particularly meat packaging, have evolved into being quite tough, and therefore difficult to open. Typically, knives and scissors are used for opening the packaging articles that have been evacuated, sealed around, and shrunken against the food product in the package. The use of knives and scissors to open these tough packaging articles increases the risk of injury for consumers and retailers. Moreover, the opening of such tough packaging requires more time and effort due to the toughness of the shrunken packaging article. For many years, the marketplace has desired a tough, heat-shrinkable, packaging article that can be opened quickly and easily, without the need for knives and scissors, so that the product can be easily removed from the packaging article. 
     SUMMARY 
     The heat-shrinkable packaging article of the invention has tear initiators for manually initiating a manual tear that opens the packaging article and allows the product to be readily removed from the torn packaging article, without the use of a knife or scissors or any other implement. A first aspect is directed to a heat-shrinkable packaging article comprising a heat-shrinkable multilayer film having an inside seal layer heat sealed to itself at a heat seal. The packaging article further comprises a first side, a second side, and a skirt or header outward of the heat seal. The skirt or header comprises an article edge and a first tear initiator. The first tear initiator is in the first side of the article. The article skirt or header further comprises a second tear initiator in the second side of the article. The article is capable of having a manually-initiated, manually-propagated first tear in the first side, and a manually-initiated and manually-propagated second tear in the second side, with the first tear and the second tear each being capable of being propagated in a machine direction from the respective first and second tear initiators, with each tear being propagated in the machine direction through the heat seal and down the length of the article, or across the article, with each tear being capable of being manually propagated through to an opposite article edge, so that upon using the multilayer film to make a packaged product by providing a product inside the article with the article being sealed closed around the product so that a package is formed, and thereafter shrinking the film around the product, the resulting package can be manually opened, and the product readily removed from the article, by manually initiating machine-direction tears from the first and second tear initiators, with the tears being manually propagated through the seal and toward the opposite edge of the article. The multilayer film exhibits a Peak Load Impact Strength of at least 50 Newtons per mil measured using ASTM D 3763-95A. The multilayer film has at least one layer containing at least one incompatible polymer blend selected from the group consisting of:
         (A) a blend of from 90 to 30 weight percent ethylene homopolymer and/or ethylene/alpha-olefin copolymer with from 10 to 70 weight percent ethylene/unsaturated ester copolymer having an unsaturated ester content of at least 10 weight percent;   (B) a blend of ionomer resin with ethylene/unsaturated ester copolymer, and/or polybutylene, and/or propylene homopolymer and/or propylene copolymer   (C) a blend of homogeneous ethylene/alpha-olefin copolymer with recycled polymer blend comprising ethylene homopolymer, propylene homopolymer, ethylene copolymer, propylene copolymer, polyamide, ethylene/vinyl alcohol copolymer, ionomer resin, anhydride-modified ethylene/alpha-olefin copolymer, and antiblocking agent;   (D) a blend of ethylene/unsaturated ester copolymer with polypropylene and/or propylene/ethylene copolymer, and/or polybutylene, and/or modified ethylene/alpha-olefin copolymer, and/or styrene homopolymer, and/or styrene/butadiene copolymer;   (E) a blend of ethylene/norbornene copolymer with ethylene/unsaturated ester copolymer and/or polypropylene and/or polybutylene;   (F) a blend of ethylene/alpha-olefin copolymer with polypropylene and/or polybutylene and/or ethylene/norbornene;   (G) a blend of homogeneous propylene homopolymer and/or homogeneous propylene copolymer with homogeneous ethylene/alpha-olefin copolymer and/or ethylene/unsaturated ester copolymer;   (H) a blend of propylene homopolymer and/or propylene/ethylene copolymer and/or polybutylene with ethylene/methyl acrylate copolymer and/or ethylene/acrylic acid copolymer and/or ethylene/butyl acrylate copolymer;   (I) a blend of polyamide with polystyrene and/or ethylene/alpha-olefin copolymer and/or ethylene/vinyl acetate copolymer and/or styrene/butadiene copolymer; and   (J) a blend of polyamide 6 and polyamide 6I6T.       

     In one embodiment, the packaging article can be torn in the machine direction after the product is placed into the article and the atmosphere evacuated from the packaging article before the article is sealed closed around the product and the film thereafter shrunk around the product. 
     A second aspect is directed to a heat-shrinkable packaging article as in the first aspect, except that instead of the multilayer, heat-shrinkable film having at least one layer containing an incompatible polymer blend, at least one layer of the multilayer film contains: (A) at least one member selected from the group consisting of ethylene/alpha-olefin copolymer, polypropylene, propylene/ethylene copolymer, polybutylene, polystyrene/butadiene copolymer, ionomer resin, ethylene/vinyl acetate copolymer, ethylene/butyl acrylate copolymer, ethylene/methyl acrylate copolymer, ethylene/acrylic acid copolymer, polyester, and polyamide, and (B) an inorganic filler selected from the group consisting of silicates, silica, siloxane, silicone resin, zinc sulfide, wollastonite, microspheres, glass fiber, metal oxide, calcium carbonate, sulfate, aluminum trihydrate, feldspar, perlite, gypsum, iron, fluoropolymer, crosslinked polymethylmethacrylate, talc, diatomaceous earth, zeolites, mica, kaolin, carbon black, and graphite. The inorganic filler is present in the at least one layer in an amount of at least 5 weight percent, based on layer weight. 
     A third aspect is directed to a heat-shrinkable packaging article as in the first aspect, except that instead of at least one of the film layers comprising an incompatible polymer blend, at least one of one layer of the multilayer film comprises a polymer having a Young&#39;s modulus of at least 80,000 psi, the polymer comprising at least one polymer selected from the group consisting of high density polyethylene, ultra high molecular weight polyethylene, polypropylene, styrene copolymer, ethylene/norbornene copolymer, polycarbonate, and polyester. 
     A fourth aspect is directed to a plurality of heat-shrinkable bags in a continuous strand. Each of the bags is connected to an adjacent bag along a weakened tear line. Each bag is a packaging article in accordance with the first, second, and/or third aspects set forth above. 
     A fifth aspect is directed to a process for making an easy-open packaged product. The process comprises (A) inserting a product into a lay-flat packaging article having at least one layer comprising an incompatible polymer blend in accordance with the first aspect or an inorganic filler in accordance with the second aspect or a high modulus polymer in accordance with the third aspect; (B) sealing the packaging article closed with at least one heat seal, thereby forming a packaged product in which the packaging article surrounds or substantially surrounds the product, with the packaging article having at least one header portion between the at least one heat seal and at least one edge of the package; (C) making a first tear initiator at a first location of the packaging article that is, or later becomes, the header portion of a first side of the packaging article, and a second tear initiator at a second location of the packaging article that is, or later becomes, the header portion of a second side of the packaging article, wherein the first side of the packaging article corresponds with the first lay-flat side of the packaging article, and the second side of the packaging article corresponds with the second lay-flat side of the packaging article; and (D) heating the heat-shrinkable film to shrink the package around the product. The heat-shrinkable multilayer film exhibits a Peak Load Impact Strength, determined using ASTM D 3763-95A, of at least 50 Newtons per mil. While this process can be carried out using a packaging article that is a bag or pouch, it can also be carried out using a seamless or backseamed lay-flat tubing, wherein after the product is inserted into the tubing, a first heat seal is made across the tubing on a first end of the product and a second heat seal is made across the tubing on a second end of the product. 
     A sixth aspect is directed to a process for making a package and manually opening the package, comprising: (A) placing a product inside a heat-shrinkable packaging article in accordance with the first, second, or third aspects above; (B) sealing the bag closed so that a package is formed; (C) shrinking the film around the product; and (D) manually initiating and manually propagating a first tear in the first side of the package, and a second tear in the second side of the package, the first tear and the second tear each being manually propagated from the respective first and second tear initiators, with each tear being manually propagated through the heat seal and across the package, or down the length of the bag, with the first and second tears being manually propagated towards an opposite edge of the packaging article, so that the product can be readily removed from the package. 
     In one embodiment, the atmosphere is evacuated from the packaging article before the packaging article is sealed closed with the product therein. The packaging article used in the process is a packaging article in accordance with the first aspect and/or the second aspect and/or the third aspect set forth above. 
     A seventh aspect is directed to a heat-shrinkable packaging article comprising a heat-shrinkable multilayer film having an inside seal layer heat sealed to itself at a heat seal, with the article having a first side and a second side, a skirt or header outward of the heat seal. The skirt or header comprises an article edge and a plurality of pairs of tear initiators. Each pair of tear initiators having a first tear initiator and a second tear initiator, with the first tear initiator being in the first side of the article, and the second tear initiator being in the second side of the article. Each pair of tear initiators is at a location for generating a manually-initiated, manually-propagated first tear in the first side of the article, and a manually-initiated and manually-propagated second tear in the second side of the article. The first tear and the second tear are each capable of being propagated in a machine direction from the respective first and second tear initiators. Each tear is capable of being propagated in the machine direction through the heat seal and down the length of the article, or across the article. Each tear is capable of being manually propagated in the machine direction through and to an opposite article edge, so that upon using the multilayer film to make a packaged product by providing a product inside the article with the article being sealed closed around the product so that a package is formed, and thereafter shrinking the film around the product, the resulting package can be manually opened. Tearing from one or more of the pairs of tear initiators allows a portion of the package to be removed from the packaged product so that an uncovered portion of the product can be separated from a remainder of the product, leaving a remainder of the package around at least a portion of the remainder of the product, by initiating first and second machine-direction tears from at least one pair of tear initiators, with the tears being propagated through the seal and toward the opposite edge of the article. The multilayer film exhibits a Peak Load Impact Strength of at least 50 Newtons per mil measured using ASTM D 3763-95A. At least layer of the multilayer film containing at least one incompatible polymer blend selected from the group set forth in the first aspect described above, which is further discussed below. 
     The heat-shrinkable packaging article can be a lay-flat, side-seal bag made from a seamless tubing, the side-seal bag having an open top, a folded bottom edge, and first and second side seals with respective first and second bag skirts outward of respective first and second side seals, with the plurality of pairs of tear initiators being spaced apart along the first bag skirt, with each tear being capable of being manually propagated across the full width of the side-seal bag through both side seals and through second skirt. 
     In the heat-shrinkable packaging article, at least a portion of the skirt or header comprising the plurality of tear initiators can be heatset, in order to reduce the shrinkage of the skirt or header upon shrinking the film around the product. 
     In the heat-shrinkable packaging article, at least a portion of a first side of the skirt or header can be heat sealed to the second side of the skirt or header in at least one heat seal. 
     In the heat-shrinkable packaging article, the first side of the skirt or header can be heat sealed to the second side of the skirt or header in a plurality of spot seals. 
     In the heat-shrinkable packaging article, the first side of the skirt or header can be heat sealed to the second side of the skirt or header in a heat seal along an outer edge of the skirt or header. 
     In the heat-shrinkable packaging article, the plurality of pairs of tear initiators can be located at intervals of from 1 to 3 inches, or at intervals of from 1 to 2 inches. 
     In the heat-shrinkable packaging article, each of the first tear initiators can be coincident or substantially coincident with the second tear initiator with which it is paired, and each of the first tear initiators can be a slit through the first side of the article, and each of the second tear initiators can be a slit through the second side of the article, and each of the slits can be oriented in the machine direction. 
     In the heat-shrinkable packaging article, each of the slits can be oriented within 20 degrees of the machine direction, or within 10 degrees of the machine direction. 
     In the heat-shrinkable packaging article, the multilayer film can have been biaxially oriented in the solid state and can have a total free shrink, as measured by ASTM D 2732, of from 20 percent to 105 percent at 185° F., or a total free shrink of from 40 percent to 100 percent at 185° F. 
     In the heat-shrinkable packaging article, the heat-shrinkable multilayer film can exhibit a Peak Load Impact Strength, determined using ASTM D 3763-95A, of from 50 to 250 Newtons per mil, and the multilayer film can have a total thickness, before shrinking, of from 1.5 mils to 5 mils. 
     In the heat-shrinkable packaging article, the multilayer film can comprise an O 2 -barrier layer, and can exhibit an oxygen transmission rate of from 1 to 20 cc/m 2  day atm at 23° C. and 100% relative humidity. 
     In the heat-shrinkable packaging article, the multilayer film can comprise: (A) a first layer that is an outer food-contact layer and that also serves as a seal layer, the first layer comprising a blend of homogeneous ethylene/alpha-olefin copolymer and linear low density polyethylene; (B) a second layer comprising a blend of heterogeneous ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer; (C) a third layer comprising ethylene/vinyl acetate copolymer; (D) a fourth layer comprising polyvinylidene chloride; (E) a fifth layer comprising ethylene/vinyl acetate copolymer; (F) a sixth layer comprising a blend of heterogeneous ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer; (G) a seventh layer comprising a blend of homogeneous ethylene/alpha-olefin copolymer and linear low density polyethylene. The layers can be present in the order of first/second/third/fourth/fifth/sixth/seventh. 
     An eighth aspect is directed to a heat-shrinkable packaging article comprising a heat-shrinkable multilayer film having an inside seal layer heat sealed to itself at a heat seal, with the article having a first side and a second side. The article has a skirt or header outward of the heat seal. The skirt or header comprises an article edge and a pair of tear initiators, each pair of tear initiators having a first tear initiator and a second tear initiator. The first tear initiator of the pair is in the first side of the article, and the second tear initiator of the pair is in the second side of the article. The article is capable of having a manually-initiated, manually-propagated first tear in the first side of the article, and a manually-initiated and manually-propagated second tear in the second side of the article. The first tear and the second tear are each being capable of being propagated in a machine direction from the pair of first and second tear initiators, with each tear being propagated in the machine direction through the heat seal and down the length of the article, or across the article. Each tear is capable of being manually propagated in the machine direction through and to an opposite article edge, so that upon using the multilayer film to make a packaged product by placing a product inside the article with the article being sealed closed around the product so that a package is formed, and thereafter shrinking the film around the product, the resulting package can be manually opened, and the product readily removed from the package, by manually initiating machine-direction tears from the first and second tear initiators, with the tears being manually propagated through the seal and toward the opposite edge of the article. The multilayer film exhibits a Peak Load Impact Strength of at least 50 Newtons per mil measured using ASTM D 3763-95A. At least one layer of the multilayer film containing at least one incompatible polymer blend selected from the group set forth in the first aspect described above, and as further discussed below. At least a portion of the skirt or header is heatset, so that upon forming the package and shrinking the film around the product, the shrinkage and curl of the skirt or header is reduced. The header or skirt further comprises at least one grip assister for assisting grip of the multilayer film during manual tearing. 
     In the heat-shrinkable article a portion of the skirt or header on the first side of the article can be heatset, and a corresponding portion of the skirt or header on the second side of the article can also be heat-set. 
     The heat-shrinkable packaging article can be an end-seal bag and the first and second tear initiators can be present in the bag skirt, and a heat seal can be present within the heatset portion of the first and second sides of the article. 
     In the heat-shrinkable article, the first tear initiator can be aligned over the second tear initiator, and the heat seal present within the heatset portion can be a perimeter seal, and the skirt can further comprise a first grip assister between the pair of tear initiators and a first end of the skirt, and a second grip assister between the pair of tear initiators and a second end of the skirt. 
     In the heat-shrinkable article, a first portion of a first side of the skirt or header can be spot sealed to the second side of the skirt or header at a first spot seal, and a second portion of the first side of the skirt or header can be spot sealed to the second side of the skirt or header at a second spot seal. 
     In the heat-shrinkable article, the heat-set portions of the first and seconds sides of the skirt or header can comprise a perimeter seal in the skirt or header. 
     In the heat-shrinkable article, the first tear initiator can align directly over the second tear initiator, and the skirt or header can further comprise a first spot seal within 1 inch of the first and second tear initiators and a first end of the skirt, and a second spot seal within 1 inch of the first and second tear initiators and a second end of the skirt or header. 
     In the heat-shrinkable article, the header or skirt can further comprise a first grip assister between the first spot seal and the first end of the header or skirt, and a second grip assister between the first and second tear initiator and a second end of the header or skirt. 
     The heat-shrinkable article can be a side seal bag or pouch having a skirt comprising a plurality of pairs of first and second tear initiators, with each first tear initiator being aligned directly over the second tear initiator with which is it paired. 
     The heat-shrinkable article can be a side-seal bag having a skirt that comprises, for each pair of first and second tear initiators, a first spot seal within 1 inch of the pair of tear initiators, the first spot seal being between the pair of tear initiators and a first end of the skirt, and a second spot seal within 1 inch of the pair of tear initiators, with the second spot seal being between the pair of tear initiators and the a second end of the skirt. 
     The heat-shrinkable article can comprise a multilayer film having an oxygen transmission rate of at least 50 cc/m 2  day at stp and 100% relative humidity, or at least 100 cc/m 2  day at stp and 100% relative humidity, or at least 150 cc/m 2  day at stp and 100% relative humidity. 
     The heat-shrinkable packaging article can comprise a multilayer film having a non-symmetrical polymeric layer arrangement. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a schematic of a first heat-shrinkable, end-seal bag in lay-flat configuration. 
         FIG. 1B  is a schematic of a second heat-shrinkable, end-seal bag in lay-flat configuration. 
         FIG. 1C  is an enlarged, detailed view of a portion of the bag of  FIG. 1B . 
         FIG. 1D  is an enlarged, detailed view of a first less desirable embodiment of a bag otherwise corresponding with the bag of  FIG. 1B . 
         FIG. 1E  is an enlarged, detailed view of a second less desirable embodiment of a bag otherwise corresponding with the bag of  FIG. 1B . 
         FIG. 1F  is an enlarged, detailed view of a third less desirable embodiment of a bag otherwise corresponding with the bag of  FIG. 1B . 
         FIG. 2  is a transverse cross-sectional view of the heat-shrinkable, end-seal bag of  FIG. 1 . 
         FIG. 3  is a schematic of a first heat-shrinkable, side-seal bag in lay-flat configuration. 
         FIG. 4  is a transverse cross-sectional view of the heat-shrinkable, side-seal bag of  FIG. 3   
         FIG. 5  is a schematic of a second heat-shrinkable, side-seal bag in lay-flat configuration. 
         FIG. 6A  is an enlarged detailed view of the tear initiation feature of the heat-shrinkable, end-seal bag of  FIG. 1 . 
         FIG. 6B  is an enlarged detailed view of an alternative tear initiation feature to be used on an alternative heat-shrinkable, end-seal bag. 
         FIG. 6C  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6D  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6E  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6F  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6G  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6H  is an enlarged detailed view of an alternative tear initiation feature to be used on another alternative heat-shrinkable, end-seal bag. 
         FIG. 6I  is an enlarged detailed view of the tear initiation feature of the bag of  FIG. 1 , with the further addition of a manual grip-enhancer. 
         FIG. 6J  is an enlarged detailed view of the tear initiation feature of the bag of  FIG. 1 , with the further addition of another manual grip enhancer. 
         FIG. 6K  is an enlarged detailed view of the tear initiation feature of the bag of  FIG. 1 , with the further addition of another manual grip enhancer. 
         FIG. 6L  is an enlarged detailed view of the tear initiation feature of the bag of  FIG. 1 , with the further addition of another manual grip enhancer. 
         FIGS. 6M, 6N, 6O, 6P, 6Q, 6R, 6S, 6T, 6U, 6V, 6W, 6X, 6Y, 6Z, 6AA, 6BB, 6CC, 6DD, 6EE, and 6FF  are enlarged detailed views of various alternative tear initiation features, some of which include manual grip enhancer. 
         FIG. 7A  is a schematic view of a first embodiment of a continuous strand of bags connected by a serration line. 
         FIG. 7B  is a schematic view of a second embodiment of a continuous strand of bags connected by a serration line. 
         FIG. 7C  is a schematic view of a third embodiment of a continuous strand of bags connected by a serration line. 
         FIG. 8  is a schematic view of the process used to make various heat-shrinkable, seamless film tubings set forth in several of the examples below, this tubing thereafter being converted into end-seal and side-seal bags by heat sealing and cutting operations (not illustrated). 
         FIG. 9  is a schematic of a packaged product made up of a meat product vacuum packaged in a shrunken end-seal bag having the tear initiation feature in the bag skirt. 
         FIG. 10  is a schematic of the packaged product of  FIG. 9  after the tearing has been initiated, but as the tearing remains in an intermediate state, the tearing proceeding down the bag film in the machine direction. 
         FIG. 11  is a schematic of the packaged product of  FIGS. 8 and 9 , after the tearing is completed. 
         FIG. 12  is a schematic of a comparative packaged product exhibiting a tear character that does not allow tearing for the full length of the bag. 
         FIG. 13  is a schematic of an alternative heat-shrinkable end-seal bag in lay-flat configuration. 
         FIG. 14  is a schematic of an alternative heat-shrinkable side-seal bag in lay-flat configuration. 
         FIG. 15  is a schematic of another alternative side-seal bag in lay-flat configuration. 
         FIG. 16  is a schematic of yet another side-seal bag in lay-flat configuration. 
         FIG. 17  is a schematic of an apparatus for carrying out the process of placing tear initiators in the header region of a packaging article. 
         FIG. 18  illustrates a schematic of an easy open package in which the easy open feature is similar to the feature in  FIG. 6J , but which is designed for automated package opening. 
         FIG. 19  illustrates a schematic of a heat-shrinkable, easy-open, side-seal bag having a plurality of pairs of tear initiators at intervals along one of the bag skirts. 
         FIG. 20  illustrates a schematic of a portion of a heat-shrinkable, easy-open, end-seal bag  370  having a pair of tear initiators along at intervals along the bag skirt. 
         FIG. 21  is an enlarged detailed view of a portion of a header or skirt having a pair of tear initiators with heatset, bonded regions on each side of the pair of tear initiators. 
         FIG. 22  is an enlarged, detailed view of a portion of a header or skirt having a pair of tear initiators with heatset, bonded regions and grip assisters. 
         FIG. 23  is an enlarged, detailed view of a portion of a header or skirt having a plurality of pairs of tear initiators, with a pair of heatset, bonded regions associated with each pair of tear initiators and a pair of grip assisters associated with each pair of tear initiators. 
         FIG. 24  is a perspective partial view of a packaged product made from an end-seal bag shrunk around a product, with curling of the shrunken skirt obscuring tear initiators and grip assisters. 
         FIG. 25  is a perspective view of a packaged product as in  FIG. 24 , but with two spot seals of the skirt to itself. 
         FIG. 26  is a perspective view of a packaged product as in  FIG. 24 , but with four spot seals of the skirt to itself. 
         FIG. 27  is a perspective view of a packaged product as in  FIG. 24 , but with a perimeter seal of the skirt to itself. 
         FIG. 28  illustrates a schematic of a heat-shrinkable, easy-open, side-seal bag having a plurality of pairs of tear initiators at intervals along one of the bag skirts, as well as an elongated heat set area on either side of each pair of tear initiators. 
     
    
    
     DETAILED DESCRIPTION 
     As used herein, the term “film” is inclusive of plastic web, regardless of whether it is film or sheet. The film can have a total thickness of 0.25 mm or less, or a thickness of from 1.5 mils to 10 mils, or from 1.5 to 5 mils, or from 1.8 mils to 4 mils, or from 2 mils to 3 mils. 
     The multilayer, heat-shrinkable film from which the packaging article is made exhibits a Peak Load Impact Strength, determined using ASTM D 3763-95A, of at least 50 Newtons per mil. ASTM D 3763-95A is hereby incorporated, in its entirety, by reference thereto. The heat-shrinkable film can have a Peak Load Impact Strength, determined using ASTM 3763-95A, of from 50 to 250 Newtons per mil, or from 60 to 200 Newtons per mil, or from 70 to 170 Newtons per mil; or from 80 to 150 Newtons per mil; or from 85 to 140 Newtons per mil; or from 95 to 135 Newtons per mil. In one embodiment, the heat-shrinkable multilayer film exhibits a Peak Load Impact Strength, determined using ASTM D 3763-95A, of from 50 to 250 Newtons per mil, and the multilayer film has a total thickness, before shrinking, of from 1.5 mils to 5 mils. 
     The multilayer film has a seal layer and at least one additional layer. At least one layer of the multilayer film contains a blend of incompatible polymers. 
     As used herein, the phrase “machine direction” refers to the direction in which the film emerges from the die. Of course, this direction corresponds with the direction the extrudate is forwarded during the film production process. The phrase “machine direction” corresponds with “longitudinal direction”. Machine direction and longitudinal direction are abbreviated as “MD” and “LD”, respectfully. However, as used herein, the phrase “machine direction” includes not only the direction along a film that corresponds with the direction the film traveled as it passed over idler rollers in the film production process, it also includes directions that deviate up to 44 degrees from the direction the film traveled as it passed over idler rollers in the production process. 
     As used herein, the phrase “transverse direction” refers to a direction perpendicular to the machine direction. Transverse direction is abbreviated as “TD”. The transverse direction also includes directions that deviate up to 44 degrees from the direction the film traveled as it passed over idler rollers in the production process. 
     As used herein, the phrase “packaging article” is inclusive end-seal bags, side-seal bags, L-seal bags, U-seal bags (also referred to as “pouches”), gusseted bags, backseamed tubings, and seamless casings, as well as packages made from such articles by placing a product in the article and sealing the article so that the product is substantially surrounded by the heat-shrinkable multilayer film from which the packaging article is made. 
     As used herein, packaging articles have two “sides”. Generally, a “side” of a packaging article corresponds with half of the article. For example, an end-seal bag is a lay-flat bag and has two sides (in this case two lay-flat sides), with each side corresponding with a lay-flat side of the seamless tubing from which the end-seal bag is made. Each lay-flat side of a seamless tubing is bounded by the creases formed as the tubing is collapsed into its lay-flat configuration between nip rollers. Each side of an end-seal bag is bounded by the bag top edge, the bag bottom edge, and the two tubing creases running the length of the bag. Likewise, a side-seal bag also has two sides, with each side also being a lay-flat side, with each side of the side-seal bag being bounded by bag side edges, a bag top edge, and a bag bottom corresponding with a tubing crease. A casing, whether seamless or backseamed, also has two sides, with each side being bounded by the ends of the casing and by creases formed as the casing is configured into its lay-flat configuration. While gusseted bags and other packaging articles may not be fully lay-flat in their structure because they have more than two flat sides, they nevertheless have “sides” bounded by creases and edges. 
     As used herein, the term “package” refers to packaging materials configured around a product being packaged. As such, the term “package” includes all of the packaging around the product, but not the product itself. 
     As used herein, the phrase “packaged product” refers to the combination of a product and the package that surrounds or substantially surrounds the product. The packaged product can be made by placing the product into a packaging article made from the heat-shrinkable multilayer film, with the article then being sealed closed so that the multilayer film surrounds or substantially surrounds the product. The film can then be shrunk around the product. 
     As used herein, the term “bag” refers to a packaging article having an open top, side edges, and a bottom edge. The term “bag” encompasses lay-flat bags, pouches, casings (seamless casings and backseamed casings, including lap-sealed casings, fin-sealed casings, and butt-sealed backseamed casings having backseaming tape thereon). Various casing configurations are disclosed in U.S. Pat. No. 6,764,729 B2, to Ramesh et al, entitled “Backseamed Casing and Packaged Product Incorporating Same, which is hereby incorporated in its entirety, by reference thereto. Various bag configurations, including L-seal bags, backseamed bags, and U-seal bags (also referred to as pouches), are disclosed in U.S. Pat. No. 6,970,468, to Mize et al, entitled “Patch Bag and Process of Making Same”, which is hereby incorporated, in its entirety, by reference thereto. While the bag configurations illustrated in the &#39;468 patent have a patch thereon, for purposes of the present invention, the patch is optional. 
     In one embodiment, the packaging article is a lay-flat, end-seal bag made from a seamless tubing, the end-seal bag having an open top, first and second folded side edges, and an end seal across a bottom of the bag, with the first and second tear initiators being in the bag skirt that is outward of the end seal, with the first tear being a machine-direction tear of the film, and the second tear being a machine-direction tear of the film, with each tear being capable of being manually propagated down the length of the end-seal bag to the opposite edge of the end-seal bag. 
     In one embodiment, the packaging article is a lay-flat, side-seal bag made from a seamless tubing, the side-seal bag having an open top, a folded bottom edge, and first and second side seals with respective first and second bag skirts outward of respective first and second side seals, with the first and second tear initiators being in the first bag skirt and outward of the first side seal, with the first tear being a machine-direction tear and the second tear being a machine-direction tear, with each tear being capable of being manually propagated across the full width of the side-seal bag to the opposite edge of the side-seal bag. 
     In one embodiment, the packaging article is a lay-flat, side-seal bag made from a seamless tubing, the side-seal bag having an open top, a folded bottom edge, a first side seal with a first bag skirt outward thereof, a second side seal with a second bag skirt outward thereof, and a third seal that extends from the first side seal to the second side seal, the third seal being at an opposite end of the bag from the open top, the third seal having a third bag skirt outward thereof, the folded bottom edge being in the third bag skirt, the third bag skirt comprising the first and second tear initiators, with the first tear being a transverse-direction tear and the second tear being a transverse-direction tear, with the first and second tears each being capable of being manually propagated down the length of the side-seal bag and to the opposite edge of the side-seal bag. 
     In one embodiment, the packaging article is a lay-flat pouch made by heat sealing two flat films to one another, the pouch having an open top, a first side seal with a first bag skirt outward thereof, a second side seal with a second bag skirt outward thereof, a bottom seal with a third bag skirt outward thereof, the bottom seal extending from the first side seal to the second side seal, the bottom seal being at an opposite end of the bag from the open top, with at least one of the bag skirts having first and second tear initiators for tearing each of the two flat films in the machine direction. 
     End-seal bags, side-seal bags, L-seal bags, T-seal bags (also referred to as backseamed bags), and U-seal bags all have an open top, closed sides, a closed bottom, and at least one heat seal. Each of these heat seals is referred to as a “factory seal” because these seals are made in a bag-making factory, rather than in a packaging factory where the bag is used to package a product. Each of the heat seals illustrated in  FIGS. 1A-1F, 3, 4, 5, 6A-6FF, 7A -C, and  13 - 16  is a factory seal. Each of the factory seals is generally made a short distance inward of the edge of the article, so that a relatively small amount of film remains outward of the heat seal, i.e., on the other side of the seal from the film that envelopes the product. A gusseted bag can also be made with a bottom seal that has a skirt, and a casing (backseamed or seamless) can have a transverse heat seal with a skirt. As used herein, the term “skirt” refers to that portion of the film that is outward of any one or more of the factory seals. The “length” of a skirt is the distance corresponding to the length of the seal inward of the skirt, and the “width” of the skirt is the distance taken perpendicular to from this seal, across the skirt, to the edge of the article. Length and width of a header (described below) are determined in the same manner. The length of a skirt or header terminates in the “ends” of the skirt or header. 
     In contrast, only one of the heat seals on the packaged product of  FIGS. 9-12  is a factory seal. The other seal is made after the product is placed in the packaging article, and is herein referred to as a “packers seal” or as an “applied seal” or as a “customer seal”. While the film outward of a factory heat seal is referred to as a “skirt”, the film outward of a customer seal is referred to as a “tail” or “header” of the packaging article. In the packaged product illustrated in  FIGS. 9-12 and 18 , one of the heat seals is a factory seal and the other heat seal is a customer seal. If tear initiator  53  in  FIG. 9  is in the skirt, then heat seal  51  is the factory seal and heat seal  55  is the customer seal. While a tear initiator may be in a skirt, it may also be in a header region of the bag. If tear initiator  53  is in the header, then heat seal  51  is the customer seal and heat seal  55  is the factory seal. Usually, the header is larger (i.e., longer) than the skirt. 
     The term “bag” also includes that portion of a package that is derived from a bag. That is, once a product is placed inside a bag, the bag is sealed closed so that it surrounds the product. Excess bag length (i.e., the bag tail or bag header) can optionally be cut off along a line close to the seal made across the bag to enclose the product within the bag, and thereafter optionally the film can be shrunk around the product. The portion of the bag that remains and is configured around the product is herein also within the term “bag”. The phrase “an opposite edge of the packaging article” refers to the edge of the bag that is directly across from the edge of the packaging article having the tear initiator. For example, a bag top edge is opposite the bag bottom edge; a first bag side edge is opposite the second bag side edge. As used herein, the phrase “a side of the bag” is used with reference to each of the first and second sides of a lay-flat bag, as well as each of the two principal, flat sides of a gusseted bag. 
     As used herein, the phrase “skirt” refers to that portion of the packaging article that is outward of a heat seal, e.g., the excess length or width on the non-product side of any factory heat seal on the packaging article. In an end-seal bag, the bag skirt is short in the machine direction and long in the transverse direction. In a side-seal bag, the bag skirt is long in the machine direction and short in the transverse direction. In either case, the “width” of the bag skirt is the shorter dimension of the skirt, and the “length” of the bag skirt is the longer dimension of the skirt. A bag skirt (or any skirt of any packaging article) can have a width, before the film is shrunk, of at least 5 millimeters, or at least 10 millimeters, or at least 15 millimeters, or at least 20 millimeters, or at least 25 millimeters, or at least 30 millimeters. Alternatively, the skirt can have a width of from 5 to 100 millimeters, or from 10 to 50 millimeters, or from 15 to 40 millimeters, or from 20 to 35 millimeters. 
     As used herein, the phrase “lay-flat bag” refers generically to non-gusseted bags used for the packaging of a variety of products, particularly food products. More specifically, the phrase “lay-flat bag” includes side seal bag, end-seal bag, L-seal bag, U-seal bag (also referred to as a pouch), and backseamed bag (also referred to as T-seal bag). The backseam can be a fin seal, a lap seal, or a butt-seal with a backseaming tape. Before the bag is shrunk, it can have a length-to-width ratio of from 1:1 to 20:1; or from 1.5:1 to 8:1; or from 1.8:1 to 6:1; or from 2:1 to 4:1. 
     The tear initiator can be a cut in the skirt or header of the packaging article. As used herein, the term “cut” refers to the penetration through the film, or shearing through the film, with a shearing means or edged instrument. Preferably the cut is made through both sides of the packaging article. The term “cut” is inclusive of both slits and notches. As used herein, the term “slit” refers to a cut through the film without the separation and removal of a piece of film from the packaging article. A slit can be from the edge of the packaging article (i.e., an “edge slit”) or internal, i.e., not extending to an edge (i.e., “internal slit” also referred to as a “slit hole”). The slit can be straight or curved or wavy. 
     The term “hole”, as used herein, includes both an internal puncture (i.e., internal hole) or internal cut (i.e., an internal slit) through the packaging article, as well as an internal cut that removes a piece of film from the article. The hole can utilize a straight cut or a curved cut. The hole can be round or square or rectangular or irregular in shape. 
     A “notch” is formed by a cut that removes a piece of film along an otherwise straight or smooth curved edge of an article skirt or Tail®, producing a point for stress concentration during the subsequent manual application of tearing force. A notch can be V-shaped or round or square or rectangular or oval or of any regular or irregular profile. 
     The slit or notch or hole in the skirt or tail can extend across at least 10 percent of the width of the skirt before the bag is shrunk; or at least 20 percent, or at least 30 percent or at least 40 percent, or at least 50 percent, or at least 60 percent, or at least 70 percent, or at least 80 percent, or at least 90 percent, of the width of the skirt or tail. The slit or notch or hole can angle inward, toward the center of the packaging article. 
     In end-seal and side-seal bags, as well as other packaging articles, a portion of the skirt is in a first lay-flat side of the article (e.g., bag), and a portion of the same skirt is in a second lay-flat side of the article (e.g., bag). The first lay-flat side of the skirt can have a first tear initiator, and the second lay-flat side of the skirt can have a second tear initiator. 
     The first tear initiator can overlap the second tear initiator when the end-seal or side-seal bag (or any other packaging article) is in its lay-flat configuration, as well as in the shrunken package. Overlapping enhances the ease of simultaneously initiating and propagating the tears in the first and second sides of the packaging article. Moreover, the first tear initiator can coincide (i.e., be positioned directly over and correspond with in length and shape) with the second tear initiator when the packaging article is in its lay-flat configuration. 
     The packaging article can be provided with both a first tear initiator that is overlapping or coincident with the second tear initiator, and a third tear that is overlapping or coincident with a fourth tear initiator. The first and second tear initiators can be positioned in a skirt or header portion of the article for making a manual tear in a machine direction, with the third and fourth tear initiators being positioned for making a manual tear in a transverse direction. The third and fourth tear initiators can be positioned in a skirt or a header. 
     As used herein, the verb “to tear” refers to pulling an object apart by force. The noun “tear” refers to the resulting break in the object being torn. The tearing of the film results from placing the film under enough tension that it is pulled apart by the force. The pulling force is concentrated by the tear initiator, which allows a smaller pulling force to pull the film apart, i.e., tear the film. High impact strength heat-shrinkable films are not susceptible to being manually torn without the presence of the tear initiator. In the heat-shrinkable packaging article, the high impact strength multilayer film undergoes tearing from the tear initiator toward the opposite edge of the packaging article. 
     The phrase “tear initiator”, as used herein, refers to any one or more of a variety of means that can be located in the skirt or header of a packaging article. The tear initiator allows manual tearing force to be concentrated on a point or small region of the film(s), so that tear initiation and tear propagation can be produced manually. A slit in the bag skirt, as illustrated in  FIG. 6A , can serve as the tear initiator. Alternatively, the tear initiator can be a V-shaped notch in a bag skirt (see  FIG. 6B ) or a rounded notch in the bag skirt (see  FIG. 6C ), or a rectangular notch in the bag skirt (see  FIG. 6D ), or a slit hole in the bag skirt (see  FIG. 6E ) or a round hole in the bag skirt (see  FIG. 6F ), or a pointed oval hole in the bag skirt (see  FIG. 6G ), or a rectangular hole in the bag skirt (see  FIG. 6H ). 
     As used herein, the terms “overlapping” and “coincident” are used with respect to the relative positioning of paired tear initiators both when the article is in its lay-flat configuration and/or after a product is placed in the article and the article sealed closed around the product. The term “coincident” refers to two paired tear initiators that are directly on top of one another. The term “overlapping” refers to two paired tear initiators that are close enough to one another than an effort to manually tear one side of the packaging article at one of the tear notches results in tearing both sides of the article, i.e., from each of the paired tear initiators. The phrase “substantially coincident” is used interchangeably with the term “overlapping”. Typically, tear initiators within one half inch of being coincident with one another are deemed to be “overlapping”. 
     As used herein, the phrase “manual” and the term “manually” are both used with reference to tearing with the hands alone i.e., without the need for a knife, scissors, or any other implement to assist with initiating or propagating tearing of the film. The term “manual” is used with respect to tear initiation, i.e., the manual starting of the tearing action, as well as with respect to tear propagation, i.e., the manual continuation (i.e., extension) of a tear that has been manually initiated. 
     In addition to the tear initiator, the packaging article can be provided with “grip assister”, also referred to herein as a “grip enhancer”. The grip assister can enhance the ease with which the film can be torn. The grip assister can be in one lay-flat side of the packaging article or in both lay-flat sides of the packaging article. The grip assister can be a hole in the skirt (and/or in the header), an integral extension of the skirt or header, or a separate film tab fastened to the skirt or header. The separate film tab can be made from a thermoplastic polymer, paper, or other material, and can be heat-shrinkable or non-heat-shrinkable. The packaging article can be provided with the combination of a tear-initiator and a grip-assister. For example, the skirt can have a slit as the tear-initiator and a hole as the grip-assister. See  FIG. 6I . The skirt can have a slit as the tear initiator and two holes providing serving as the grip assister. See  FIG. 6J . Alternatively, the grip assister can be a tab, as illustrated in  FIG. 6K , this figure further illustrating the tab being used in combination with a slit. 
     With respect to the tearing of the film from which the packaging article is made, as used herein the phrase “the tear is capable of being propagated . . . ” refers to the manner in which the film tends to propagate the tear when the bag is subjected to an ordinary manual opening thereof, i.e., the packaging article can be “gripped and ripped” or “gripped and torn” in the ordinary course of opening. The packaging article exhibits substantially linear tear. Usually, the linear tear is substantially in line with the machine direction, or substantially in line with the transverse direction. The tearing is carried out after shrinking the heat-shrinkable film. 
     If the tear is being made in the machine direction of the film, the tear may be within from 0 to 44 degrees of the actual machine direction of the film, i.e., so long as the tear can be propagated toward and to the opposite side edge of the bag; or the tear may be within from 0 to 20 degrees, or within from 0 to 15 degrees, or within from 1 to 20 degrees, or within from 0 to 10 degrees; or within from 0 to 5 degrees, or within from 0 to 2 degrees of the machine direction of the film. The same holds true of transverse direction tearing, i.e., the tear may be within from 0 to 44 degrees of the actual transverse direction of the film; or the tear may be within 0 to 20 degrees, or within 1 to 20 degrees, or within from 0 to 10 degrees; or within from 0 to 5 degrees, or within from 0 to 2 degrees of the transverse direction of the film. 
     As used herein, the phrase “readily removed” is applied to the removal of a product from a packaging article surrounding or substantially surrounding the product. As used herein, the phrase “readily removed” refers to the manual removal of the product from within the confines of the packaging article without any further substantial amount of tearing, and without any substantial further permanent deformation of the film. As used herein, the phrase “substantial tearing of the film” refers to tearing greater than or equal to 2 millimeters in length. As used herein, the phrase “substantial permanent deformation of the film” refers to a permanent stretching of the film greater than or equal to 2 millimeters at any location on the film. 
     As used herein, the phrases “seal layer,” “sealing layer,” “heat seal layer,” and “sealant layer,” refer to an outer film layer, or layers, involved in heat sealing the film to itself, another film layer of the same or another film, and/or another article which is not a film. Heat sealing can be performed in any one or more of a wide variety of manners, such as melt-bead sealing, thermal sealing, impulse sealing, ultrasonic sealing, hot air sealing, hot wire sealing, infrared radiation sealing, ultraviolet radiation sealing, electron beam sealing, etc.). A heat seal is usually a relatively narrow seal (e.g., 0.02 inch to 1 inch wide) across a film. One particular heat sealing means is a heat seal made using an impulse sealer, which uses a combination of heat and pressure to form the seal, with the heating means providing a brief pulse of heat while pressure is being applied to the film by a seal bar or seal wire, followed by rapid cooling. 
     In some embodiments, the seal layer can comprise a polyolefin, particularly an ethylene/alpha-olefin copolymer and/or an ionomer resin. For example, the seal layer can contain a polyolefin having a density of from 0.88 g/cc to 0.917 g/cc, or from 0.90 g/cc to 0.917 g/cc. More particularly, the seal layer can comprise at least one member selected from the group consisting of very low density polyethylene and homogeneous ethylene/alpha-olefin copolymer. Very low density polyethylene is a species of heterogeneous ethylene/alpha-olefin copolymer. The heterogeneous ethylene/alpha-olefin (e.g., very low density polyethylene) can have a density of from 0.900 to 0.917 g/cm 3 . The homogeneous ethylene/alpha-olefin copolymer in the seal layer can have a density of from 0.880 g/cm 3  to 0.910 g/cm 3 , or from 0.880 g/cm 3  to 0.917 g/cm 3 . Homogeneous ethylene/alpha-olefin copolymers useful in the seal layer include metallocene-catalyzed ethylene/alpha-olefin copolymers having a density of from 0.917 g/cm 3  or less, as well as a very low density polyethylene having a density of 0.912 g/cm 3 , these polymers providing excellent optics. Plastomer-type metallocene sealants with densities less than 0.910 g/cm 3  also provided excellent optics. 
     As used herein, the term “barrier”, and the phrase “barrier layer”, as applied to films and/or film layers, are used with reference to the ability of a film or film layer to serve as a barrier to one or more gases. The multilayer heat-shrinkable film used to make the article can optionally comprise a barrier layer. In the packaging art, oxygen (i.e., gaseous O 2 ) barrier layers can comprise, for example, at least one member selected from the group consisting of hydrolyzed ethylene/vinyl acetate copolymer (designated by the abbreviations “EVOH” and “HEVA”, and also referred to as “saponified ethylene/vinyl acetate copolymer” and “ethylene/vinyl alcohol copolymer”), polyvinylidene chloride, amorphous polyamide, polyamide MXD6 (particularly MXD6/MXDI copolymer), polyester, polyacrylonitrile, etc., as known to those of skill in the art. In addition to the first and second layers, the heat-shrinkable film may further comprise at least one barrier layer. 
     The heat-shrinkable film can exhibit O 2 -transmission rate of from 1 to 20 cc/m 2  day atm at 23° C. and 100% relative humidity, or from 2 to 15 cc/m 2  day atm at 23° C. and 100% relative humidity, or from 3 to 12 cc/m 2  day atm at 23° C. and 100% relative humidity, or from 4 to 10 cc/m 2  day atm at 23° C. and 100% relative humidity. Alternatively, the heat-shrinkable film can exhibit an O 2 -transmission rate of from 21 cc/m 2  day atm to 15,000 cc/m 2  day atm, or from 500 cc/m 2  day atm to 10,000 cc/m 2  day atm, or from 2000 cc/m 2  day atm to 6,000 cc/m 2  day atm. O 2 -transmission rate can be measured in accordance with ASTM-D-3985. 
     As used herein, the phrase “tie layer” refers to any internal layer having the primary purpose of adhering two layers to one another. Tie layers can comprise any polymer having a polar group grafted thereon. Such polymers adhere to both nonpolar polymers such as polyolefin, as well as polar polymers such as polyamide and ethylene/vinyl alcohol copolymer. Tie layers can comprise at least one member selected from the group consisting of polyolefin (particularly homogeneous ethylene/alpha-olefin copolymer), anhydride-modified polyolefin, ethylene/vinyl acetate copolymer, and anhydride-modified ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, and ethylene/methyl acrylate copolymer. Typical tie layer polymers comprise at least one member selected from the group consisting of anhydride modified linear low density polyethylene, anhydride modified low density polyethylene, anhydride modified polypropylene, anhydride modified methyl acrylate copolymer, anhydride modified butyl acrylate copolymer, homogeneous ethylene/alpha-olefin copolymer, and anhydride modified ethylene/vinyl acetate copolymer. 
     As used herein, the phrases “inner layer” and “internal layer” refer to any layer, of a multilayer film, having both of its principal surfaces directly adhered to another layer of the film. 
     As used herein, the phrase “outer layer” refers to any film layer having less than two of its principal surfaces directly adhered to another layer of the film. A multilayer film has two outer layers, each of which has a principal surface adhered to only one other layer of the multilayer film. 
     As used herein, the term “adhered” is inclusive of films which are directly adhered to one another using a heat seal or other means, as well as films which are adhered to one another using an adhesive which is between the two films. This term is also inclusive of layers of a multilayer film, which layers are of course adhered to one another without an adhesive therebetween. The various layers of a multilayer film can be “directly adhered” to one another (i.e., no layers therebetween) or “indirectly adhered” to one another (i.e., one or more layers therebetween). 
     Once a multilayer film is heat sealed to itself or another member of the package being produced (i.e., is converted into a packaging article, e.g., a bag, pouch, or casing), one outer layer of the film is an inside layer of the packaging article and the other outer layer becomes the outside layer of the packaging article. The inside layer can be referred to as an “inside heat seal/product contact layer”, because this is the film layer that is sealed to itself or another article, and it is the film layer closest to the product, relative to the other layers of the film. The other outer layer can be referred to as the “outside layer” and/or as the “outer abuse layer” or “outer skin layer”, as it is the film layer furthest from the product, relative to the other layers of the multilayer film. Likewise, the “outside surface” of a packaging article (i.e., bag) is the surface away from the product being packaged within the article. 
     While the multilayer heat-shrinkable film can be sealed to itself to form a packaging article, optionally a heat-shrinkable patch film can be adhered to article (particularly to a bag). The patch film can be heat-shrinkable, and can have a total free shrink at 185° F. of at least 35 percent, measured in accordance with ASTM D-2732. The bag film and the patch film can have a total free shrink at 185° F. that are within 50 percent of one another, or within 20 percent of one another, or with 10 percent of one another, or within 5 percent of one another, or within 2 percent of one another. The patch may or may not cover the heat seal. If the patch covers a heat seal, optionally the heat seal may be made through the patch. If the tear is to be made through the bag and through the patch, the patch should cover a heat seal, and the tear initiator should be through both the bag film and the patch film. The bag can have a curved seal and the patch can extend into and through the region of the curved seal and over and past the curved seal. If the bottom edge of the bag is curved, a bottom edge of the patch can also be curved. The patch bag can have any desired configuration of patch on bag as disclosed in any one or more of U.S. Pat. Nos. 4,755,403, 5,540,646, 5,545,419, 6,296,886, 6,383,537, 6,663,905, and 6,790,468, each of which is hereby incorporated, in its entirety, by reference thereto. 
     End-seal bags with curved heat seals, and end-seal patch bags with curved heat seals, can be designed for have manual tear initiation and manual directional tear propagation. While the end-seal may be curved, the bottom edge of the bag may be straight across the tubing, or may also be curved. A curved bottom heat seal and a straight across bag bottom edge leaves more space in the bottom corners of the bag skirt for providing tear initiators, as well as for grip assisters. Patch bags with curved end seals are disclosed in U.S. Pat. No. 6,270,819, to Wiese, which is hereby incorporated, in its entirety, by reference thereto. 
     The term “polymer”, as used herein, is inclusive of homopolymer, copolymer, terpolymer, etc. “Copolymer” includes copolymer, terpolymer, etc. 
     Blends of incompatible polymers in one or more film layers can enhance the tear initiation, tear propagation, and linear tear properties of the film, including the ability to manually tear down the full length or across the full width of a package made from a packaging article comprising a multilayer packaging film, i.e., tearing through a seal and through and to an opposite edge of the package. For a package made from an end-seal bag, a machine-direction tear can be manually initiated in the bag skirt, and the machine-direction tear can be manually propagated through the seal and down the length of the bag, for a distance up to the full length of the package, i.e., to that portion of the package that corresponds with the opposite edge of the package after the packaging article is used to make the package. For a package made from a side-seal bag, the machine direction tear can be manually initiated in a bag skirt, and the machine direction tear can be manually propagated through the skirt and through the associated heat seal, with the tear thereafter being propagated in the machine direction, across the full width of the package, i.e., to that portion of the package that corresponds with the opposite edge of the side-seal bag after the bag is used to make the package. 
     As used herein, the phrase “incompatible polymers” refers to two polymers (i.e., a blend of at least two polymers) that are incapable of forming a solution or even a stable two-phase blend, and that tend to separate after being mixed. When blended, incompatible polymers are not miscible with one another, and phase separate into a continuous domain and a discontinuous domain that may be finely dispersed. The presence of one or more film layers comprising a blend of incompatible polymers may assist, enhance, or even cause the linear tear property of the multilayer heat-shrinkable film used to make the heat-shrinkable bag. 
     The blend of incompatible polymers comprises at least one blend selected from the group of (A) through (I) set forth above under the first aspect of the invention. In the (A) blend above, the ethylene homopolymer and/or ethylene/alpha-olefin copolymer can be present in an amount of from 80 to 40 weight percent, or from 70 to 50 weight percent, based on total blend weight. The ethylene/unsaturated ester can be present in an amount of from 20 to 60 weight percent, or from 30 to 50 weight percent, based on total blend weight. The ethylene/unsaturated ester copolymer can have an unsaturated ester content of from 10 to 85 weight percent, or 10 to 50 weight percent, or 10 to 30 weight percent, or 12 to 30 weight percent, based on weight of ethylene/unsaturated ester copolymer. 
     In the (D) blend above, the ethylene/unsaturated ester copolymer can be present in an amount of from 10 to 75 weight percent, 20 to 50 weight percent, or 25 to 40 weight percent, or 25 to 35 weight percent, based on total blend weight. The polypropylene and/or propylene/ethylene copolymer and/or polybutylene and/or modified ethylene/alpha-olefin copolymer, and/or styrene homopolymer, and/or styrene/butadiene copolymer can be present in the blend in an amount of from 90 to 15 weight percent, or from 80 to 50 weight percent, or from 75 to 60 weight percent, or from 75 to 65 weight percent, based on total blend weight. 
     In the (F) blend above, the ethylene/alpha-olefin copolymer can be present in the blend in an amount of from 90 to 15 weight percent, based on total blend weight, or from 80 to 50 weight percent, or from 75 to 60 weight percent, or from 25 to 65 weight percent, based on total blend weight, with polypropylene (particularly propylene/ethylene copolymer) and/or polybutylene and/or ethylene/norbornene in an amount of from 10 to 85 weight percent, or from 20 to 50 weight percent, or from 25 to 40 weight percent, or from 25 to 35 weight percent, based on total blend weight. 
     In the (G) blend above, the homogeneous propylene homopolymer and/or homogeneous propylene copolymer can be present in the blend in an amount of from 90 to 25 weight percent, or 85 to 50 weight percent, or 80 to 60 weight percent, or 75 to 65 weight percent, based on total blend weight, with homogeneous ethylene/alpha-olefin copolymer and/or ethylene/unsaturated ester copolymer in an amount of from 10 to 75 weight percent, or 15 to 50 weight percent, or 20 to 40 weight percent, or 25 to 35 weight percent, based on total blend weight. 
     In one embodiment, the film comprises an incompatible blend of ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer having a vinyl acetate content of from 10 to 50 weight percent based on copolymer weight, the blend containing the ethylene/alpha-olefin copolymer in an amount of from 80 to 35 weight percent based on blend weight and ethylene/unsaturated ester copolymer in an amount of from 20 to 65 weight percent based on blend weight, with the multilayer film containing the blend in an amount of from 20 to 95 weight percent, based on the weight of the multilayer film, wherein the multilayer film has been biaxially oriented in the solid state and has a total free shrink, as measured by ASTM D 2732, of from 15 percent to 120 percent at 185° F. 
     In another embodiment the film can comprises an incompatible blend of ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer having a vinyl acetate content of from 10 to 30 weight percent based on copolymer weight, the blend containing the ethylene/alpha-olefin copolymer in an amount of from 75 to 45 weight percent based on blend weight and ethylene/unsaturated ester copolymer in an amount of from 25 to 55 weight percent based on blend weight, with the multilayer film containing the blend in an amount of from 30 to 70 weight percent, based on the weight of the multilayer film, wherein the multilayer film has been biaxially oriented in the solid state and has a total free shrink, as measured by ASTM D 2732, of from 20 percent to 105 percent at 185° F. 
     In another embodiment, the film can comprise an incompatible blend of ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer having a vinyl acetate content of from 12 to 30 weight percent, the blend containing the ethylene/alpha-olefin copolymer in an amount of from 70 to 50 percent based on blend weight and ethylene/unsaturated ester copolymer in an amount of from 30 to 50 weight percent based on blend weight, the multilayer film containing the blend in an amount of from 30 to 70 weight percent, based on the weight of the multilayer film, and wherein the multilayer film has been biaxially oriented in the solid state and has a total free shrink, as measured by ASTM D 2732, of from 40 percent to 100 percent at 185° F. The shrinking is typically carried out by immersion in hot water, such as water at 185° F., for a period of from 2 to 60 seconds. 
     If any one or more of the incompatible blends comprises an ethylene/alpha-olefin copolymer, the ethylene/alpha-olefin copolymer can comprise at least one member selected from the group consisting of: (i) ethylene/hexene copolymer having a density of from about 0.90 g/cc to about 0.925 g/cc, and (ii) ethylene/octene copolymer having a density of from about 0.90 g/cc to about 0.925 g/cc. 
     Other blends of incompatible polymers that may be used include the following: (i) a blend of 50 weight percent cyclic olefin copolymer with 50 weight percent propylene homopolymer; (ii) a blend of 70 wt. percent polystyrene with 30 wt. percent ethylene/vinyl acetate copolymer having a vinyl acetate content of 9 percent or 15 percent; (iii) a blend of 70 wt. percent very low density polyethylene and 30 wt. percent cyclic olefin copolymer; (iv) a blend of 70 weight percent ethylene/propylene copolymer and 30 weight percent homogeneous ethylene/alpha-olefin copolymer; (v) a blend of 70 weight percent ethylene/propylene copolymer and 30 wt. percent ethylene/vinyl acetate copolymer having a vinyl acetate content of 9 percent or 15 percent; (vi) a blend of 70 weight percent ethylene/propylene copolymer and 30 weight percent ethylene/methyl acrylate copolymer; (vii) a blend of 70 weight percent polystyrene with 30 weight percent amorphous nylon; (viii) a blend of 70 weight percent ionomer resin with 30 weight percent ethylene/vinyl acetate copolymer having a vinyl acetate content of 4 percent; (ix) a blend of 70 weight percent polyamide with 30 weight percent low density polyethylene; (x) a blend of 65 weight percent amorphous polyamide with 35% styrene/butadiene/styrene block copolymer. 
     The tear initiation, tear propagation, and linear tear property of a multilayer heat-shrinkable film may also be enhanced by providing one or more layers of the film with a filler material, such as an inorganic filler. Polymeric systems that incorporate high filler concentrations may also enhance linear tear behavior. Depending on the particle size and dispersion, a filler concentration as low as 5 weight percent filler (i.e., based on total layer weight) in ethylene/alpha-olefin copolymer, polypropylene, propylene/ethylene copolymer, polybutylene, polystyrene/butadiene copolymer, ionomer resin, ethylene/vinyl acetate copolymer, ethylene/butyl acrylate copolymer, ethylene/methyl acrylate copolymer, ethylene/acrylic acid copolymer, polyester, polyamide, etc., may contribute to the linear tear behavior. More particularly, the presence of filler in an amount of from 5 to 95 weight percent, or in an amount of from 5 to 50 weight percent, or in an amount of from 10 to 40 weight percent, or from 20 to 35 weight percent, may be used. 
     Suitable fillers include silicates (particularly sodium silicate, potassium silicate, and aluminum silicate, alkali alumino silicate), silica (particularly amorphous silica), siloxane, silicone resin, zinc sulfide, wollastonite, microspheres, glass fiber, metal oxide (particularly oxides of titanium, zinc, antimony, magnesium, iron, and aluminum), calcium carbonate, sulfate (particularly barium sulfate and calcium sulfate), aluminum trihydrate, feldspar, perlite, gypsum, iron, fluoropolymer, crosslinked polymethylmethacrylate, talc, diatomaceous earth, zeolites, mica, kaolin, carbon black, and graphite. 
     The filler concentration required to achieve low tear initiation force is dependent on particle geometry, particle size, particle aspect ratio, and compatibility of the filler and the polymer matrix. Some fillers are chemically treated to improve the compatibility of the particle and the polymer into which it is dispersed. 
     The tear initiation, tear propagation, and linear tear property of a multilayer heat-shrinkable film may also be enhanced by providing one or more layers of the film with a polymer that provides the film with a relatively high Young&#39;s modulus, e.g., a polymer having a Young&#39;s modulus of at least 80,000 psi. Such polymers can comprise at least one member selected from the group consisting of high density polyethylene, ultra high molecular weight polyethylene, polypropylene (particularly propylene homopolymer), styrene copolymer (particularly styrene/butadiene block copolymer), ethylene/norbornene copolymer, polycarbonate, and polyester. The multilayer heat-shrinkable film may have a Young&#39;s Modulus of at least 80,000 psi. Young&#39;s modulus may be measured in accordance with one or more of the following ASTM procedures: D638, D882; D5026-95a; D4065-89, each of which is incorporated herein in its entirety by reference. The film may have a Young&#39;s modulus of at least about, and/or at most about, any of the following: 100,000; 130,000; 150,000; 200,000; 250,000; 300,000; 350,000; and 400,000 pounds/square inch, measured at a temperature of 73° F. The film may have any of the forgoing ranges of Young&#39;s modulus in at least one direction (e.g., in the machine direction or in the transverse direction) or in both directions (i.e., the machine (i.e., longitudinal) and the transverse directions). 
     As used herein, terms such as “polyamide”, “polyolefin”, “polyester”, etc are inclusive of homopolymers of the genus, copolymers of the genus, terpolymers of the genus, etc, as well as graft polymers of the genus and substituted polymers of the genus (e.g., polymers of the genus having substituent groups thereon). 
     As used herein, the phrase “propylene/ethylene copolymer” refers to a copolymer of propylene and ethylene wherein the propylene mer content is greater than the ethylene mer content. Propylene/ethylene copolymer is not a species of “ethylene/alpha-olefin copolymer”. 
     The phrase “ethylene/alpha-olefin copolymer” is particularly directed to heterogeneous copolymers such as linear low density polyethylene (LLDPE), very low and ultra low density polyethylene (VLDPE and ULDPE), as well as homogeneous polymers such as metallocene catalyzed polymers such as EXACT® resins obtainable from the Exxon Chemical Company, and TAFMER® resins obtainable from the Mitsui Petrochemical Corporation. All these latter copolymers include copolymers of ethylene with one or more comonomers selected from C 4  to C 10  alpha-olefin such as butene-1 (i.e., 1-butene), hexene-1, octene-1, etc. in which the molecules of the copolymers comprise long chains with relatively few side chain branches or cross-linked structures. This molecular structure is to be contrasted with conventional low or medium density polyethylenes which are more highly branched than their respective counterparts. The heterogeneous ethylene/alpha-olefins commonly known as LLDPE have a density usually in the range of from about 0.91 grams per cubic centimeter to about 0.94 grams per cubic centimeter. Other ethylene/alpha-olefin copolymers, such as the long chain branched homogeneous ethylene/alpha-olefin copolymers available from the Dow Chemical Company, known as AFFINITY® resins, are also included as another type of homogeneous ethylene/alpha-olefin copolymer useful in the film and process described herein. 
     As used herein, the phrase “heterogeneous polymer” refers to polymerization reaction products of relatively wide variation in molecular weight and relatively wide variation in composition distribution, i.e., typical polymers prepared, for example, using conventional Ziegler-Natta catalysts. Heterogeneous copolymers typically contain a relatively wide variety of chain lengths and comonomer percentages. Heterogeneous copolymers have a molecular weight distribution (Mw/Mn) of greater than 3.0. 
     As used herein, the phrase “homogeneous polymer” refers to polymerization reaction products of relatively narrow molecular weight distribution and relatively narrow composition distribution. Homogeneous polymers are useful in various layers of the multilayer heat-shrinkable film. Homogeneous polymers are structurally different from heterogeneous polymers, in that homogeneous polymers exhibit a relatively even sequencing of comonomers within a chain, a mirroring of sequence distribution in all chains, and a similarity of length of all chains, i.e., a narrower molecular weight distribution. Furthermore, homogeneous polymers are typically prepared using metallocene, or other single-site type catalysis, rather than using Ziegler Natta catalysts. Homogeneous ethylene/alpha-olefin copolymer can have a Mw/Mn of ≤3.0. 
     As used herein, the term “polyamide” refers to a polymer having amide linkages, more specifically synthetic polyamides, either aliphatic or aromatic, either in semi-crystalline or amorphous form. It is intended to refer to both polyamides and co-polyamides. The polyamides can be selected from nylon compounds approved for use in producing articles intended for use in processing, handling, and packaging food, including homopolymers, copolymers and mixtures of the nylon materials described in 21 C.F.R. 177.1500 et seq., which is incorporated herein by reference. Exemplary of such polyamides include nylon homopolymers and copolymers such as those selected from the group consisting of nylon 4,6 (poly(tetramethylene adipamide)), nylon 6 (polycaprolactam), nylon 6,6 (poly(hexamethylene adipamide)), nylon 6,9 (poly(hexamethylene nonanediamide)), nylon 6,10 (poly(hexamethylene sebacamide)), nylon 6,12 (poly(hexamethylene dodecanediamide)), nylon 6/12 (poly(caprolactam-co-laurallactam)), nylon 6,6/6 (poly(hexamethylene adipamide-co-caprolactam)), nylon 6/66 (poly(caprolactam-co-hexamethylene adipamide)), nylon 66/610 (e.g., manufactured by the condensation of mixtures of nylon 66 salts and nylon 610 salts), nylon 6/69 resins (e.g., manufactured by the condensation of epsilon-caprolactam, hexamethylenediamine and azelaic acid), nylon 11 (polyundecanolactam), nylon 12 (polyauryllactam), nylon MXD6, nylon MXDI, nylon 6I/6T, and copolymers or mixtures thereof. Unless otherwise indicated, the phrase “semi-crystalline polyamide” includes all polyamides that are not considered to be amorphous polyamides. All semi-crystalline polyamides have a determinable melting point. 
     The film is a heat-shrinkable film. The film can be produced by carrying out only monoaxial orientation, or by carrying out biaxial orientation. As used herein, the phrase “heat-shrinkable” is used with reference to films which exhibit a total free shrink (i.e., the sum of the free shrink in both the machine and transverse directions) of at least 10% at 185° F., as measured by ASTM D 2732, which is hereby incorporated, in its entirety, by reference thereto. All films exhibiting a total free shrink of less than 10% at 185° F. are herein designated as being non-heat-shrinkable. The heat-shrinkable film multilayer film can have a total free shrink at 185° F. of from 10 percent to 150 percent, or from 15 percent to 120 percent, or from 20 percent to 100 percent, or from 45 to 95 percent, or from 40 to 90 percent, or from 30 percent to 80 percent, or from 35 percent to 60 percent, as measured by ASTM D 2732. 
     Heat shrinkability can be achieved by carrying out orientation in the solid state (i.e., at a temperature below the glass transition temperature of the polymer). The total orientation factor employed (i.e., stretching in the transverse direction multiplied by drawing in the machine direction) can be any desired factor, such as at least 2×, at least 3×, at least 4×, at least 5×, at least 6×, at least 7×, at least 8×, at least 9×, at least 10×, at least 16×, or from 1.5× to 20×, from 2× to 16×, from 3× to 12×, or from 4× to 9×. 
     In the packaging of a product in a heat-shrinkable film that is thereafter shrunk around the product, the header and/or skirt of the packaging article tends to shrink and curl. This is because the shrinkage of the film making up the header and/or skirt is relatively unrestrained during the period it is heated to induce shrinkage. Since the tear initiators are present in the header and/or skirt, the relatively unrestrained shrinking and curling of the header and/or skirt makes it more difficult for a consumer to detect the presence and location of the tear initiators, as well as making it more difficult to manually (or automatically) grab and use the tear initiators to tear the package open or to tear off a portion of the package. 
     Heatsetting at least a portion of the header and/or skirt reduces the unrestrained shrink and curling of the header and/or skirt as the film shrinks around the product. As used herein, the term “heatsetting” refers to reheating the film under restraint, i.e., so that it cannot undergo substantial shrinkage during reheating. Heatsetting is carried out by heating the film (while under restraint) to a temperature, and for a time, so that the resulting heatset portion of the film exhibits a total free shrink at 185° F. of no more than 49% of the total free shrink at 185° F. of the film before the onset of the heatsetting process. The reheating can be of the entire skirt and/or header, or of one or more regions of the skirt and/or header. Small regions can be heatset, including isolated spots or lines or even elongated regions across the skirt or header, such as heat seal lines and areas extending outward therefrom. The heatsetting of at least a portion of the header and/or skirt allows the packaging article to later be shrunk around the product while leaving the header and/or skirt more apparent and more accessible for the consumer to use. 
     Heatsetting can be carried out in a variety of manners. For example, the skirt and/or header (or any portion thereof) can be subjected to heat and pressure by contact with a hot platen, such as applying heat and pressure using a hot iron, a heated platen press, or even a seal bar, such as an impulse sealer. Heat sealing devices, such as a spot sealer or an impulse sealer using a hot wire or hot seal bar, inherently heatset that portion (i.e., region) of the film being heat sealed during the heat sealing process, as the amount of heat required to heatset is less than the amount of heat needed to seal the film to itself or another component of the package. Heat sealing utilizes enough heat that regions extending outward from the seal are also heatset. The size of these regions outward of the seal depends upon the manner in which the heat seal is made, and the characteristics of the film being heat sealed. The processes used for heatsetting generally causes both lay-flat sides of a packaging article to be heatset in “corresponding” areas or portions or regions, i.e., areas or portions or regions of substantially equal size that are in contact with one another but which are on opposite sides of the article. 
     Heatsetting reduces the total free shrink exhibited by the heatset portion of the heat-shrinkable film. While heatsetting can be carried out to any desired degree, the heatset film can exhibit a total free shrink at 185° F. of up to 50 percent; or up to 40%; or up to 30%; or up to 20%, or up to 10%; or from 0 to 5%. Heatsetting a skirt or header of a package, or regions of the skirt or header, reduces the unrestrained shrinkage of at least the heatset regions of the skirt or header during the heating of the package to shrink the film against the product inside the package. Reducing the unrestrained shrinkage of the even a portion of the skirt or header allows the skirt and/or header to remain closer to its initial size and shape after the remainder of the film is shrunk around the product. Heatsetting also reduces the curling of the skirt and/or header as the film is shrunk around the product, particularly when the heatsetting is carried out by heat sealing a first side of the skirt and/or header to the second side of the skirt and/or header. Reductions in unrestrained shrinkage and unrestrained curling of the skirt and/or header make it easier for a consumer to detect and utilize tear initiators located in the skirt and/or header. 
     As used herein, the term “spot” is used with reference to heat sealing and heat-setting, the term referring any discrete area of a packaging article in which (i) the film of one or both sides of the article are heat-set in the discrete area, or (ii) a first side of the article is heat sealed to a second side of the article in the discrete area. The term “spot” is used with reference to both a “spot seal” as well as a “spot heatset area”. Spot seals of a first side of a skirt to the second side of the skirt have been made using a HAKO 936 soldering station set for 100° C., attached to which is a HAKO 907 soldering iron designated as being 24V/50W. 
     As used herein, the phrase “perimeter seal” refers to a seal in a skirt or header of an article, the seal extending along at least 51 percent of the length of the skirt or header, the seal being outward of any tear initiators and grip assisters present in the skirt or header. 
     In one embodiment, the film does not comprise a crosslinked polymer network. In another embodiment, the film comprises a crosslinked polymer network. Optionally, the film can be irradiated to induce crosslinking of polymer, particularly polyolefin in the film. The film can be subjected to irradiation using an energetic radiation treatment, such as corona discharge, plasma, flame, ultraviolet, X-ray, gamma ray, beta ray, and high energy electron treatment, which induce cross-linking between molecules of the irradiated material. The irradiation of polymeric films is disclosed in U.S. Pat. No. 4,064,296, to BORNSTEIN, et. al., which is hereby incorporated in its entirety, by reference thereto. BORNSTEIN, et. al. discloses the use of ionizing radiation for crosslinking polymer present in the film. 
     Radiation dosages are referred to herein in terms of the radiation unit “RAD”, with one million RADS, also known as a megarad, being designated as “MR”, or, in terms of the radiation unit kiloGray (kGy), with 10 kiloGray representing 1 MR, as is known to those of skill in the art. A suitable radiation dosage of high energy electrons is in the range of up to about 16 to 166 kGy, more preferably about 30 to 90 kGy, and still more preferably, 30 to 50 kGy. Preferably, irradiation is carried out by an electron accelerator and the dosage level is determined by standard dosimetry processes. Other accelerators such as a van der Graaf or resonating transformer may be used. The radiation is not limited to electrons from an accelerator since any ionizing radiation may be used. 
     The heat-shrinkable, multilayer film in the packaging article can be fully coextruded, or prepared using an extrusion-coating process. Optionally, an annular extrudate (herein also referred to as a “tape”) can be irradiated before the additional layers are extrusion coated onto the substrate tape. Irradiation produces a stronger polymer network by crosslinking the polymer chains. Extrusion-coating allows a portion of the final multilayer structure to be crosslinked by irradiation (and thereby strengthened), in combination with avoiding irradiation of, for example, a layer of polyvinylidene chloride applied to the substrate via extrusion coating. Irradiation of polyvinylidene chloride is undesirable because irradiation can cause degradation of polyvinylidene chloride. Extrusion coating and irradiation are disclosed in U.S. Pat. No. 4,278,738, to Brax et al, which is hereby incorporated, in its entirety, by reference thereto. 
     In the multilayer, heat-shrinkable film, all of the film layers can be arranged symmetrically with respect to the polymeric composition of each film layer. In addition, all of the film layers can be arranged symmetrically with respect to both composition and thickness. In one embodiment, the seal layer is thicker than the second outer layer. The seal layer can have a thickness of from 110% to 300% of the thickness of the second outer layer, or from 150% to 250% of the thickness of the second outer layer. 
     One heat-shrinkable multilayer film from which the packaging article can be made comprises seven layers in the order: 1/2/3/4/5/6/7. The first layer is an outer food-contact layer and seal layer, and comprises homogeneous ethylene/alpha-olefin copolymer. The second layer comprising ethylene/methyl acrylate copolymer. The third layer comprises a blend of polyamide 6 with polyamide 6I,6T. The fourth layer comprises EVOH. The fifth layer comprises a blend of polyamide 6 with polyamide 6I,6T. The sixth layer comprises ethylene/methyl acrylate copolymer. The seventh layer comprises a blend of low density polyethylene and linear low density polyethylene. See Example 16, below. 
     Another heat-shrinkable film from which the packaging article can be made has the structure: seal/tie/barrier/blend of polyamide 6 and/or polyamide 6/66 with polyamide 6I6T/tie/outer abuse layer. The seal layer can contain ethylene/alpha-olefin copolymer or other polymer suitable for use in a seal layer. The tie layers can contain an anhydride-modified ethylene/alpha-olefin copolymer or other suitable polymer for use in a tie layer. The barrier layer can contain EVOH or any other suitable polymer for use in a barrier layer. The outer abuse layer can contain polyester or any other suitable polymer for use in an outer abuse layer, e.g., polyolefin or polyamide, particularly high density polyethylene or linear low density polyethylene. 
     Another heat-shrinkable multilayer film from which the packaging article can be made comprises three layers in the order: 1/2/3. The first layer is an outer food-contact layer that also serves as a seal layer. The first layer comprises a blend of ethylene/vinyl acetate copolymer, linear low density polyethylene, and homogeneous ethylene/alpha-olefin copolymer. The second layer comprising polyvinylidene chloride. The third layer comprises a blend of ethylene/vinyl acetate copolymer, linear low density polyethylene, and homogeneous ethylene/alpha-olefin copolymer. See Example 12, below. 
     Another heat-shrinkable multilayer film from which the packaging article can be made comprises seven layers in the order: 1/2/3/4/5/6/7. The first layer that is an outer food-contact layer and that also serves as a seal layer. The first layer comprises a blend of homogeneous ethylene/alpha-olefin copolymer and linear low density polyethylene. The second layer comprises a blend of heterogeneous ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer. The third layer comprises ethylene/vinyl acetate copolymer. The fourth layer comprises polyvinylidene chloride. The fifth layer comprises ethylene/vinyl acetate copolymer. The sixth layer comprises a blend of heterogeneous ethylene/alpha-olefin copolymer and ethylene/vinyl acetate copolymer. The seventh layer comprises a blend of homogeneous ethylene/alpha-olefin copolymer and linear low density polyethylene. See Examples 1 and 2, below. 
       FIGS. 1A and 2  together illustrate a schematic of end-seal bag  10 , in a lay-flat position. End-seal bag  10  can be made from a seamless film tubing.  FIG. 2  is a transverse cross-sectional view of end-seal bag  10  of  FIG. 1A , taken through section  2 - 2  of  FIG. 1A . Viewing  FIGS. 1A and 2  together, end-seal bag  10  comprises heat-shrinkable bag film  11 , bag top edge  12  defining an open top, folded first side edge  13 , folded second side edge  14 , bottom edge  15 , and end seal  16 . End seal  16  is commonly referred to as a “factory seal” because it is a seal made at the bagmaking factory, rather than at the site where the bag is used to package a product. End-seal bag  10  further has first lay-flat side  17 , second lay-flat side  18 , and bag skirt  19 . Bag skirt  19  is outward of end seal  16  (i.e., “outward” in that bag skirt  19  is further from the center of end-seal bag  10 , and exterior of the product-containing cavity within end-seal bag  10 ). Bag skirt  19  includes a portion of first lay-flat side  17  and a portion of second lay-flat side  18 . Bag skirt  19  further comprises first tear initiator  20  in first lay-flat side  17 , and second tear initiator  21  (illustrated by a dashed line because it is underneath first lay-flat side  17 ) in second lay-flat side  18 . 
       FIG. 1B  illustrates a schematic of an alternative end-seal bag  10 ′, in a lay-flat position. End-seal bag  10 ′ can be made from a seamless film tubing. End-seal bag  10 ′ comprises heat-shrinkable bag film  11 ′, bag top edge  12 ′ defining an open top, folded first side edge  13 ′, folded second side edge  14 ′, bottom edge  15 ′, and curved end seal  16 ′. End-seal bag  10 ′ further has first lay-flat side  17 ′, second lay-flat side  18 ′, and bag skirt  19 ′. Bag skirt  19 ′ is outward of curved end seal  16 ′. Bag skirt  19 ′ comprises first tear initiator  20 ′ in first lay-flat side  17 ′, and second tear initiator  21 ′ (illustrated by a dashed line because it is underneath first lay-flat side  17 ′) in second lay-flat side  18 ′. Both first tear-initiator  20 ′ and second tear initiator  21 ′ are slits though the bag that do not extend to either curved end seal  16 ′ or bag bottom edge  15 ′. End seal bag  10 ′ also has grip assist hole  35  in first lay-flat side  17 ′ and second grip assist hole (not illustrated) in second lay-flat side  18 ′. These grip-assist holes facilitate gripping the bag for the manual tear initiation and manual tear propagation. 
     Grip assist holes can be sized to allow a user&#39;s finger(s) to be inserted therethrough to assist in gripping the film. Grip assist holes work in conjunction with the tear initiators, by providing a secure manual grip of the bag in a location designed to assist in generating tear initiation force along a tear line emanating from the tear initiators. 
     The grip assist hole in a first lay-flat side of the packaging article can overlap or coincide with the grip assist hole in a second lay-flat side of the packaging article. While grip assist holes can have any desired shape (e.g., round, rectangular, square, triangular, pentagonal, hexagonal, etc.), preferably the holes are round, or any “corners” on the holes are rounded, to reduce the presence of stress concentration points that could cause a tear to initiate from the grip assist hole, as an objective is to have the tear initiated from the tear initiator, with the tear running to an opposite side edge of the bag. 
     In one embodiment, the grip-assist holes can be made by cutting through both lay-flat sides of the packaging article to remove a piece of film to form the holes. However, this process is more difficult to carry out, and it produces small, loose pieces of film corresponding with the size of the cut hole. These pieces of film may lodge inside the packaging article and thereafter adhere to a food product placed in the packaging article, which of course is an undesirable result. In order to prevent the production of a small, loose pieces of film, a cut can be made in the film in a shape that corresponds with a “partial hole cut”, i.e., a cut through the film to make a portion of the hole, the cut not being complete so that a hole is formed. Such a cut leaves a “hanging chad” so that no separated small pieces of film are produced by the cut. 
       FIG. 1B  and  FIG. 1C  each illustrate hanging chad  36  formed by the partial hole cut made in bag  10 ′. As illustrated in  FIG. 1C , hanging chad  36  is formed by a cut having endpoints  63  and  64 . It has been found that leaving hanging chad  36  connected to film  11 ′ by the film connecting cut endpoints  63  and  64  results in a tear emanating from tear initiation cuts  20 ′ and  21 ′, with the tear running through seal  16 ′ and through the length of bag  11 ′. On the other hand, if a hanging chad is formed by a cut as illustrated in  FIG. 1D , or  FIG. 1E , or  FIG. 1F , use of the partial hole cut as some grip assistors results in a tear that likely will not emanate from tear initiation cuts  20 ′ and  21 ′, but rather is likely to initiate a tear from the partial hole cut towards side edge  13 ′ or towards bottom edge  15 ′, as illustrated by the dashed lines in each of  FIGS. 1D, 1E, and 1F . 
     Hanging chad  36  can be made so that it is connected to film  11 ′ at a region oriented towards tear initiation cuts  20 ′ and  21 ′, as illustrated in  FIG. 1B  and  FIG. 1C . The cut that forms hanging chad  36  can have endpoints that, if connected by a line, provide a line that is parallel to side edge  13 ′ and/or parallel to tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 30 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 25 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 20 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 15 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 10 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 5 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 3 degrees of being parallel to side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′, or by a line within plus or minus 2 degrees of side edge  13 ′ and/or tear initiation cuts  20 ′ and  21 ′. 
       FIGS. 3 and 4  together illustrate a schematic of side-seal bag  22 , in a lay-flat position. Side-seal bag  22  can be made from a seamless film tubing.  FIG. 4  is a transverse cross-sectional view of side-seal bag  22  of  FIG. 3 , taken through section  4 - 4  of  FIG. 3 . Side-seal bag  22  comprises heat-shrinkable bag film  23 , top edge  24  defining an open top, folded bottom edge  25 , first side seal  26 , and second side seal  27 . Side-seal bag  22  has first lay-flat side  28 , second lay-flat side  29 , first bag skirt  30 , and second bag skirt  31 . First bag skirt  30  is outward of first side seal  26  and second bag skirt  31  is outward of second side seal  27 . First bag skirt  30  includes a portion of first lay-flat side  28  and a portion of second lay-flat side  29 . First bag skirt  30  further comprises first tear initiator  31  in first lay-flat side  28 , and second tear-initiator  33  (illustrated by a dashed line because it is underneath first lay-flat side  28 ) in second lay-flat side  29 . 
       FIG. 5  illustrates a schematic of alternate side-seal bag  70 , also in lay-flat position. Alternate side-seal bag  70  can be made from a seamless film tubing. Alternate side-seal bag  70  comprises heat-shrinkable bag film  71 , top edge  72  defining an open top, folded bottom edge  73 , first side seal  74 , second side seal  75 , and bottom seal  76 . Alternate side-seal bag  70  has first lay-flat side  77 , second lay-flat side  78 , first bag skirt  79 , second bag skirt  80 , and third bag skirt  81 . First bag skirt  79  is outward of first side seal  74 . Second bag skirt  80  is outward of second side seal  75 . Third bag skirt  81  is outward of bottom seal  76 . Third bag skirt  81  includes a portion of first lay-flat side  77  and a portion of second lay-flat side  78 . Third bag skirt  81  further comprises first tear initiator  82  in first lay-flat side  77 , and second tear initiator  83  (illustrated by a dashed line because it is underneath first lay-flat side  77 ) in second lay-flat side  78 . 
       FIGS. 6A through 6L  illustrate enlarged cutaway portions of various embodiments of for a heat-shrinkable end-seal bag such as the bag illustrated in  FIG. 1  and  FIG. 2 . 
     In  FIG. 6A , bag  10 A has end seal  16 A and bag skirt  19 A in first and second lay-flat sides of bag  10 A. First lay-flat side  17 A of bag  10 A has slit  20 A, and second lay-flat side  18 A of bag  10 A has coinciding slit  21 A. 
     In  FIG. 6B , bag  10 B has end seal  16 B and bag skirt  19 B in first and second lay-flat sides of bag  10 B. First lay-flat side  17 B of bag  10 B has V-notch  20 B, and second lay-flat side  18 B of bag  10 B has coinciding V-notch  21 B. 
     In  FIG. 6C , bag  10 C has end seal  16 C and bag skirt  19 C in first and second lay-flat sides of bag  10 C. First lay-flat side  17 C of bag  10 C has round notch  20 C, and second lay-flat side  18 C of bag  10 C has coinciding round notch  21 C. 
     In  FIG. 6D , bag  10 D has end seal  16 D and bag skirt  19 D in first and second lay-flat sides of bag  10 D. First lay-flat side  17 D of bag  10 D has rectangular notch  20 D, and second lay-flat side  18 D of bag  10 D has coinciding rectangular notch  21 D. 
     In  FIG. 6E , bag  10 E has end seal  16 E and bag skirt  19 E in first and second lay-flat sides of bag  10 E. First lay-flat side  17 E of bag  10 E has slit hole  20 E, and second lay-flat side  18 E of bag  10 E has coinciding slit hole  21 E. 
     In  FIG. 6F , bag  10 F has end seal  16 F and bag skirt  19 F in first and second lay-flat sides of bag  10 F. First lay-flat side  17 F of bag  10 F has round hole  20 F, and second lay-flat side  18 F of bag  10 F has coinciding round hole  21 F. 
     In  FIG. 6G , bag  10 G has end seal  16 G and bag skirt  19 G in first and second lay-flat sides of bag  10 G. First lay-flat side  17 G of bag  10 G has pointed oval hole  20 G, and second lay-flat side  18 G of bag  10 G has coinciding pointed oval hole  21 G. 
     In  FIG. 6H , bag  10 H has end seal  16 H and bag skirt  19 H in first and second lay-flat sides of bag  10 H. First lay-flat side  17 H of bag  10 H has rectangular hole  20 H, and second lay-flat side  18 H of bag  10 H has coinciding rectangular hole  21 H. 
     In  FIG. 6I , bag  10 I has end seal  16 I and bag skirt  19 I in first and second lay-flat sides of bag  10 I. First lay-flat side  17 I of bag  10 I has slit  20 I and grip-assist hole  35 I, and second lay-flat side  18 I of bag  10 I has coinciding slit  21 I and coinciding grip-assist hole  361 . 
     In  FIG. 6J , bag  10 J has end seal  16 J and bag skirt  19 J in first and second lay-flat sides of bag  10 J. First lay-flat side  17 J of bag  10 J has slit  20 J and grip-assist holes  35 J and  37 J, and second lay-flat side  18 J of bag  10 J has coinciding slit  21 J and coinciding grip-assist holes  36 J and  38 J. 
     In  FIG. 6K , bag  10 K has end seal  16 K and bag skirt  19 K in first and second lay-flat sides of bag  10 K. First lay-flat side  17 K of bag  10 K has slit  20 K and grip-assist tab  39 K, and second lay-flat side  18 K of bag  10 K has coinciding slit  21 K and coinciding grip-assist tab  40 K. 
     In  FIG. 6L , bag  10 L has end seal  16 L and bag skirt  19 L in first and second lay-flat sides of bag  10 L. First lay-flat side  17 L of bag  10 L has slit  20 L and grip-assist tabs  39 L and  41 L, and second lay-flat side  18 L of bag  10 L has coinciding slit  21 L and coinciding grip-assist tabs  40 L and  42 L. 
       FIGS. 6M, 6N, 6O, 6P, 6Q, 6R, 6S, 6T, 6U, 6V, 6W, 6X, 6Y, 6Z, 6AA, 6BB, 6CC, 6DD, 6EE, and 6FF  are enlarged detailed views of various alternative embodiments including tear initiator, with most of these embodiments further including a grip assister. The grip assister is illustrated as a chadless-hole in  FIGS. 6M, 6Q, 6U, 6BB, 6CC, and 6DD . The grip assister is illustrated as a hole with hanging chad in  FIGS. 6N, 6O, 6P, 6R, 6S, 6T, 6V, 6W, 6X, 6Y, and 6FF . 
     It has been found that tear initiation can be generated with less force if the tear initiator is a slit angled relative to the side edge of the packaging article, i.e., into the packaging article, as illustrated in, for example,  FIG. 6M . The slit can be angled from 1 to 45 degrees off of the machine direction, or angled from 3 to 30 degrees, or angled from 5 to 25 degrees, or angled from 10 to 20 degrees, or angled about 15 degrees. 
     A plurality of the heat-shrinkable end-seal bags of can be supplied individually in a container, or as a set of individual bags in shingled relationship on one or more tapes in accordance with U.S. Pat. No. 4,113,139, hereby incorporated, in its entirety, by reference thereto. 
     Alternatively, a plurality of bags can be provided as a continuous strand of serrated bags, as illustrated in  FIGS. 7A, 7B, and 7C . The continuous strands of bags in these figures are end-seal bags connected to one another in end-to-end, with a tear line of perforations being present so that bags can be torn off of the strand.  FIG. 7A  illustrates a portion of an elongate strip composed of a large number of end seal bags  65  made from a continuous seamless film tubing. Each end-seal bag has first side edge  67 , second side edge  69 , bottom seal  71 , a bottom edge connected to top edge of adjoining bag along frangible tear line  73  formed by perforations through both lay-flat sides of the seamless film tubing. Each end-seal bag  65  is also provided with tear initiator  75  and grip assister  77 , in the form of a hole through each lay-flat side of the bag. One or both of the holes can be made with a hanging chad therein, as described above. 
       FIG. 7B  illustrates an alternative set of bags  65 ′ also made from a continuous seamless film tubing. Each end-seal bag  65 ′ has first side edge  67 , second side edge  69 , curved bottom seal  71 ′, a curved bottom edge connected to a curved top edge of the adjoining bag along curved tear line  73 ′ formed by perforations through both lay-flat sides of the seamless film tubing. Each end-seal bag  65 ′ is also provided with tear initiator  75 , and grip assister  77  in the form of a hole through each lay-flat side of the bag. 
       FIG. 7C  illustrates an alternative set of bags  65 ″ also made from a continuous seamless film tubing. Each end-seal bag  65 ″ has first side edge  67 , second side edge  69 , curved bottom seal  71 ′, and straight bottom edge connected to a straight top edge of the adjoining bag along straight tear line  73  formed by perforations through both lay-flat sides of the seamless film tubing. Each end-seal bag  65 ″ is also provided with tear initiator  75 , and grip assister  77  in the form of holes through each lay-flat side of the bag. 
     The combination of the straight tear line  73  and the curved bottom seal  71 ′ in the strand of serrated bags illustrated in  FIG. 7C , provide extra space for the tear initiators and manual grip assisters while at the same time providing a curved seal to better fit a variety of meat products to be packaged in the shrinkable bags. Otherwise, the tear initiators and the manual grip assisters require greater bag skirt length (e.g., the bags in  FIGS. 7A and 7B ) to provide the same amount of space for the tear initiators and grip assisters. Moreover, straight tear line  73  provides bags that avoid the curvature at the open top end of the bag. Curved top edge of the packaging articles of a curved edge bag top as in the bags of  FIG. 7B  can cause problems on various commercial automated bag loaders that utilize pressurized air inflation to open the bag, as the pointed edge regions of the bags tend to fold inward. Moreover, the pointed edge of a curved edge bag top may get out of the required alignment for use with suction cup style bag commercial bag opening devices. 
       FIG. 8  illustrates a schematic of a preferred process for producing the multilayer heat-shrinkable film from which the packaging article can be made. In the process illustrated in  FIG. 8 , solid polymer beads (not illustrated) are fed to a plurality of extruders  120  (for simplicity, only one extruder is illustrated). Inside extruders  120 , the polymer beads are forwarded, melted, and degassed, following which the resulting bubble-free melt is forwarded into die head  122 , and extruded through an annular die, resulting in tubing  124  which is 10 to 30 mils thick, more preferably 15 to 25 mils thick. 
     After cooling or quenching by water spray from cooling ring  126 , tubing  124  is collapsed by pinch rolls  128 , and is thereafter fed through irradiation vault  130  surrounded by shielding  132 , where tubing  124  is irradiated with high energy electrons (i.e., ionizing radiation) from iron core transformer accelerator  134 . Tubing  124  is guided through irradiation vault  130  on rolls  136 . Preferably, tubing  124  is irradiated to a level of about 4.5 MR. 
     After irradiation, irradiated tubing  138  is directed through nip rolls  140 , following which tubing  138  is slightly inflated, resulting in trapped bubble  142 . However, at trapped bubble  142 , the tubing is not significantly drawn longitudinally, as the surface speed of nip rolls  144  are about the same speed as nip rolls  140 . Furthermore, irradiated tubing  138  is inflated only enough to provide a substantially circular tubing without significant transverse orientation, i.e., without stretching. 
     Slightly inflated, irradiated tubing  138  is passed through vacuum chamber  146 , and thereafter forwarded through coating die  148 . Second tubular film  150  is melt extruded from coating die  148  and coated onto slightly inflated, irradiated tube  138 , to form two-ply tubular film  152 . Second tubular film  150  preferably comprises an O 2 -barrier layer, which does not pass through the ionizing radiation. Further details of the above-described coating step are generally as set forth in U.S. Pat. No. 4,278,738, to BRAX et. al., which is hereby incorporated, in its entirety, by reference thereto. 
     After irradiation and coating, two-ply tubing film  152  is wound up onto windup roll  154 . Thereafter, windup roll  154  is removed and installed as unwind roll  156 , on a second stage in the process of making the tubing film as ultimately desired. Two-ply tubular film  152 , from unwind roll  156 , is unwound and passed over guide roll  158 , after which two-ply tubular film  152  passes into hot water bath tank  160  containing hot water  162 . The now collapsed, irradiated, coated tubular film  152  is submersed in hot water  162  (having a temperature of about 210° F.) for a retention time of at least about 5 seconds, i.e., for a time period in order to bring the film up to the desired temperature for biaxial orientation. Thereafter, irradiated tubular film  152  is directed through nip rolls  164 , and bubble  166  is blown, thereby transversely stretching tubular film  152 . Furthermore, while being blown, i.e., transversely stretched, nip rolls  168  draw tubular film  152  in the longitudinal direction, as nip rolls  168  have a surface speed higher than the surface speed of nip rolls  164 . As a result of the transverse stretching and longitudinal drawing, irradiated, coated biaxially-oriented blown tubing film  170  is produced, this blown tubing preferably having been both stretched in a ratio of from about 1:1.5-1:6, and drawn in a ratio of from about 1:1.5-1:6. More preferably, the stretching and drawing are each performed a ratio of from about 1:2-1:4. The result is a biaxial orientation of from about 1:2.25-1:36, more preferably, 1:4-1:16. While bubble  166  is maintained between pinch rolls  164  and  168 , blown tubing film  170  is collapsed by rolls  172 , and thereafter conveyed through nip rolls  168  and across guide roll  174 , and then rolled onto wind-up roll  176 . Idler roll  178  assures a good wind-up. 
       FIG. 9  illustrates a perspective view of package  50  made by placing a meat product into an end-seal bag having end seal  51 , evacuating the atmosphere from within the bag, and sealing the bag closed with packing seal  55 , and thereafter trimming off and discarding the excess bag length. Bag skirt  52  has slit  53  therein as the tear initiators for initiating manual opening of package  50 . Slit  53  extends in the machine direction, toward end seal  51  from bag bottom edge  54 . 
       FIG. 10  illustrates package  50 ′ at an intermediate stage of the manual opening process, i.e., after having initiated tearing of the bag for a distance of about 25% of the length of the bag, revealing meat product  58 . Linear, machine-direction tear  56  has been manually propagated through end seal  51  and down the length of the end-seal bag. Note that machine direction tear  56  is not terminated by being propagated to side edge  57  of package  50 . 
       FIG. 11  illustrates package  50 ″ at a final stage in the manual opening process, i.e., after having torn the end-seal bag for a distance corresponding with over 90% of its length, toward the opposite edge of the packaging article of the package, exposing enough of the length of meat product  58  that the product can be readily removed from package  50 ″. Linear, machine-direction tear  56 ′ has been manually propagated through end seal  51  and down the length of the end-seal bag. 
       FIG. 12  illustrates a perspective view of comparative package  60  after tearing has been initiated and propagated almost to completion, i.e., almost to termination at side edge  61 , about 15 to 20 percent down the length of the package. Package  60  is representative of most heat-shrinkable bags in the marketplace today, which, if provided with a tear initiator in the bag skirt, undergo this type of “dog-leg” manual tear  62  initiation and propagation to side edge  61 , whereby meat product  58  cannot be readily removed from torn package  60 . 
       FIG. 13  illustrates a schematic of an alternative heat-shrinkable end-seal bag  10 , in a lay-flat position. End-seal bag  10  comprises heat-shrinkable bag film  11 , bag top edge  12  defining an open top, folded first side edge  13 , folded second side edge  14 , bottom edge  15 , and end seal  16 . End-seal bag  10  further has bag skirt  19  outward of end seal  16 . The end-seal bag has slit  20  that is a tear initiator in the first lay-flat side of the bag, and slit  21  that is a tear initiator in the second lay-flat side of the bag. The end-seal bag also has hole  120  that is a grip assister in the first lay-flat side of the bag, and hole  123  that is a grip assister in the second lay-flat side of the bag. The tear initiator and the grip assister are located near bag top edge  12 . When a product is placed in the bag and the bag sealed closed so that it surrounds the product, the tear initiator and the grip assister will then be located in the excess bag length known as the “bag tail” or as the bag “header”. Frequently, the bag tail provides more area for inclusion of the tear initiator and the grip assister than bag skirt  19 . 
       FIG. 14  illustrates a schematic view of alternative side-seal bag  22  in lay-flat configuration. Side-seal bag  22  comprises top edge  24  defining an open top, folded bottom edge  25 , first side seal  26 , and second side seal  27 , transverse bottom seal  34 , first lay-flat side  28 , second lay-flat side  29 , first bag skirt  30 , and second bag skirt  31 , and third bag skirt  204 . First bag skirt  30  is outward of first side seal  26 , second bag skirt  31  is outward of second side seal  27 , and third bag skirt  204  is outside of bottom seal  34 . Third bag skirt  204  comprises first tear initiator  201  and first grip assister  203 , each of which is present in both lay-flat sides of bag  22 . First bag skirt  30  comprises second tear initiator  202  and second grip assister  204 , each of which are present in both lay-flat sides of bag  22 . After a product is placed in the bag, and the bag sealed closed, side-seal bag  22  can be opened by making a first tear propagated from first tear initiator  201 , the tear being propagated for the full length of bag  22 , thereby opening the bag for removal of the product. Thereafter, side-seal bag  22  can undergo a second tear propagated from second tear initiator  202 , the second tear being propagated across the full remaining width of bag  22 , enhancing the ease of removal of the product from the opened package. 
       FIG. 15  illustrates a schematic view of alternative side-seal bag  22 ′ in lay-flat configuration. Bag  22 ′ has top edge  24  defining an open top, folded bottom edge  25 , first side seal  26 , and second side seal  27 , transverse bottom seal  34 , first lay-flat side  28 , second lay-flat side  29 , first bag skirt  30 , second bag skirt  31 , and third bag skirt  204 . First bag skirt  30  is outward of first side seal  26 , second bag skirt  31  is outward of second side seal  27 , and third bag skirt  204  is outside of bottom seal  34 . Third bag skirt  204  comprises first tear initiator  201  and first grip assister  203 , each of which is present in both lay-flat sides of bag  22 . First bag skirt  30  comprises second tear initiator  206  and second grip assister  208 , each of which are present in both lay-flat sides of bag  22 ′. After a product is placed in the bag, and the bag sealed closed, the package made from bag  22 ′ can be opened by making a first tear propagated from first tear initiator  201 , the tear being propagated for the full lengths of bag  22 ′, thereby opening the bag for removal of the product. Thereafter, bag  22 ′ can undergo a second tear propagated from second tear initiator  206 , the second tear being propagated across the full remaining width of bag  22 ′, thereby enhancing the ease of removal of the product from the opened package. Unlike bag  22  of  FIG. 14 , the order of which tear is made first is not important in the opening of bag  22 ′. 
       FIG. 16  illustrates a schematic view of alternative side-seal bag  22 ″ in lay-flat configuration. Bag  22 ″ has top edge  24  defining an open top, folded bottom edge  25 , first side seal  26 , and second side seal  27 , transverse bottom seal  34 , first lay-flat side  28 , second lay-flat side  29 , first bag skirt  30 , second bag skirt  31 , and third bag skirt  204 . First bag skirt  30  is outward of first side seal  26 , second bag skirt  31  is outward of second side seal  27 , and third bag skirt  204  is outward of bottom seal  34 . Near the top edge  24  of bag  22 ″, in a region intended to be a bag tail after a product is placed into bag  22 ″ and a seal made across bag  22 ″ so that the product is fully enclosed within the bag, is first tear initiator  207  and first grip assister  209 , each of which are present in both lay-flat sides of bag  22 ″. First bag skirt  30  comprises second tear initiator  211  and second grip assister  213 , each of which are present in both lay-flat sides of bag  22 ″ After a product is placed in bag  22 ″, and the bag sealed closed, the package made from bag  22 ″ can be opened by making a first tear propagated from first tear initiator  207 , the tear being propagated for the full lengths of bag  22 ″, thereby opening the bag for removal of the product. Thereafter, bag  22 ″ can undergo a second tear propagated from second tear initiator  211 , the second tear being propagated across the full remaining width of bag  22 ″, thereby enhancing the ease of removal of the product from the opened package. 
       FIG. 17  is a schematic of an apparatus for carrying out the process of placing tear initiators in the header region of a heat-shrinkable end-seal bag, with the tear initiators being made in the header during the packaging process. The tear initiators (and the optional grip assisters) can be made in the bag either before or after the product is placed into the packaging article, either before or after the bag is evacuated, and either before or after the heat seal is made to close the bag. Placing the tear initiators in the bag after the product is placed in the bag eliminates the potential for the tear initiator to cause the bag to tear during loading. Although the packaging article in  FIG. 17  is an end-seal bag, the packaging article could be any packaging article in accordance with any one or more of the various aspects of the invention described above. 
       FIG. 17  illustrates a portion of vacuum chamber packaging machine  300 , such as a series  8600  automated rotary chamber vacuum packaging machine from Cryovac, Inc. After end-seal bag  302  having product  304  therein is placed into the opened vacuum chamber, vacuum chamber lid  306  comes down to close the vacuum chamber and clamp across the top (header) portion of bag  302 , so that bag  302  is clamped between chamber lid  306  and vacuum chamber base  308 . For simplicity, only small portions of chamber lid  306  and chamber base  308  are illustrated in  FIG. 17 . For more detailed information on this machine, see U.S. Pat. No. 4,550,548, which is hereby incorporated by reference, in its entirety. 
     Once bag  302  is clamped into position and chamber lid  306  closed, one or more holes are punched through both sides of the header portion of bag  302  by the downward movement of piercing knife  310 , which thereafter is retracted to the position illustrated. These holes allow atmosphere to readily evacuate bag  302  as the atmosphere is evacuated from the closed vacuum chamber. After atmospheric evacuation has been completed, seal seat  312  moves downward (i.e., into the position illustrated in  FIG. 17 ) so that bag  302  is clamped between heat seal wires  314  and heat seal platen  316 . Heat seal wires  314  are heated to produce a heat seal across bag  302 , resulting in the closure of bag  302  and the formation of a packaged product. Shortly thereafter, tear-initiator knife  318  is activated downward and then retracted, with tear-initiator knife  318  piercing both sides of bag  302  to produce machine-direction tear initiators in each side of the header of bag  302 . Optionally, a separate grip-assister knife (not illustrated, but preferably located alongside and spaced a short distance from knife  318 ) is activated downwardly and then retracted, so that it cuts through both sides of the header of bag  302 , to form a grip assister in each side of bag  302 . Cut-off knife  320  is then downwardly activated to cut off the excess length from the header of bag  302 . Then the chamber is opened and the now easy-open packaged product is removed from the chamber. 
     While the process described above with respect to  FIG. 17  could be used to make an easy open packaged product, alternatively the process could be carried out on vertical form fill and seal machines or on horizontal form fill and seal machines, to produce easy open packaged products. Typically, vertical and horizontal form fill and seal processes are not carried out under vacuum. Such equipment, packages, and processes are set forth in U.S. Pat. Nos. 4,905,452, 4,861,414, and 4,768,411, each of which is hereby incorporated, in its entirety, by reference thereto. 
     The tear initiators (and the optional grip assisters) can also be designed to facilitate automated opening, in addition to being designed to facilitate manual tearing to open the package. Automated tearing devices include hooks actuated by pneumatic actuators (air or hydraulic or electric), divergent hooks on chain conveyors, motorized hooks, and clamps in place of hooks. 
       FIG. 18  illustrates a schematic of packaged product  330  in which product  332  is packaged inside packaging article  334  having factory seal  336  and customer seal  338 . Packaging article  334  includes header  340  with tear initiator  342  through each side of the package and with pairs of grip assisters  344  and  346 , each pair being through both sides of the package, with one pair being on a first side of tear initiator  342 , and the other pair being on the other side of tear initiator  342 . In this manner, pairs of hooks or clamps can grip the package utilizing grip assisters  344  and  346  to thereafter automatically open packaging article  334 . A robot, or another device that grips and tears the package open, or hanging the packaged product on hooks on diverging tracks, could be used to automatically open package  334 . 
       FIG. 19  illustrates side-seal bag  350  having first side seal  352 , second side seal  354 , skirt sides  356  and  357  outward of first side seal  352 , skirt sides  358  and  359  outward of second side seal  354 , open top  360 , and folded bottom edge  362 . Skirt side  356  has a plurality of tear initiators  364  therein, and skirt side  357  has therein a plurality of tear initiators  366  (illustrated with dotted lines). The plurality of tear initiators  364  are positioned at intervals along skirt side  356 , and the plurality of tear initiators  366  are positioned at intervals along skirt side  357 . Each individual tear initiator  364  in skirt side  356  is paired with an individual tear initiator  366  in skirt side  357 , so that paired sets of tear initiators  364  and  366  are provided. In the embodiment of  FIG. 19 , bag  350  is shown in lay-flat configuration, with each individual tear initiator  364  aligning directly over each individual tear initiator  366 . 
     Upon packaging a product in bag  350  and sealing bag  350  closed and shrinking bag  350  around the product inside, a tearing force exerted at a paired set of individual tear initiators  364  and  366  simultaneously initiates two machine-direction tears, each tear passing through heat seal  352  and thereafter propagating across the film along a line traversing a portion of the film that corresponds with what was a single lay-flat side of bag  350  before the shrinking of the film around the product. The tears are propagated through skirt sides  356  and  357 , through heat seal  352 , across the package, through seal  354 , and then through skirt sides  358  and  359 , so that a portion of the film can be detatched from the remainder of the film, in order to expose a portion of the product and/or allow the product to be removed from the package. Of course, if the film has been shrunk tightly around the product, the removal of a portion of the film leaves the remainder of the film wrapped tightly around the product, thereby preserving freshness. As is also apparent from  FIG. 19 , tear initiators  364  and  366  can be slits oriented perpendicular to seal  352 . As such, tear initiators  364  and  366  are oriented directly in line with the machine direction in which the film was produced. 
     In  FIG. 19 , skirt sides  356  and  357  are each provided with a plurality of tear initiators so that upon packaging a product within bag  350  and shrinking the film around the product, two tears can be initiated from a first paired set of tear initiators  364  and  366 , i.e., a pair of tear initiators close to either folded bottom edge  362  or the transverse heat seal (not illustrated) made across the top of bag  350  to close bag  350  after the product is placed into bag  350 . The two tears can be propagated across the film in tears corresponding with the width of the package. Each tear is made across what was originally one lay-flat side of bag  350 . The result of tearing all the way across the package is that a portion of the film making up the package is removed to expose a portion of the product, while leaving a remainder of the product covered by the remaining portion of the film making up the package. In this manner, most or substantially all of the unused portion of the product can remain covered by the film, with the remainder of the product thereby retaining greater freshness than if it is exposed to the environment, including handling. 
     If desired, the now-exposed end of the remainder of the product can be covered with a separate cover, such as a separate piece of film, such as stretch film or the like. As more product is desired for consumption, the next pair of individual tear initiators in the sequence can be utilized to make another tear across the entirety of the package, and more product removed, and the process repeated, until all of the product is consumed. 
       FIG. 20  illustrates a portion of an end-seal bag  370  having end seal  372 , first folded side edge  374 , second folded side edge  376 , bottom edge  378 , skirt  379 , a plurality of first tear initiators  380  in a first side of skirt  379 , a plurality of second tear initiators  382  (illustrated with dotted lines) in a second side (not illustrated) of skirt  379 , with the plurality of first tear initiators  380  being positioned at intervals along the first side of skirt  379 , and the plurality of second tear initiators  382  being positioned at intervals along the second side of skirt  379 . Each individual tear initiator  380  in the first side of skirt  379  is paired with an individual tear initiator  382  in the second side of skirt  379 , to together provide a paired set of two tear initiators. When end-seal bag  370  is in the lay-flat configuration, each of the first tear initiators  380  aligns directly over a corresponding second tear initiator  382 . After placing a product in the bag and sealing it closed under vacuum and shrinking the bag around the product, a manual tearing action at the location of a single pair of tear initiators  380  and  382  causes the simultaneous initiation of two machine-direction tears down the length of each lay-flat side of bag  350 . In the embodiment of  FIG. 20 , end-seal bag  370  is showing in lay-flat configuration, with each individual tear initiator  384  aligning directly over each individual tear initiator  386 . Each tear passes through heat seal  372  and thereafter propagates down the length of bag  370  along a line traversing a portion of the film that corresponds with what was a single lay-flat side of bag  370  before the shrinking of the film around the product. The tears thereafter pass through the top seal (not illustrated) as well as through the header (not illustrated) above the top seal, so that a portion of the film can be detatched from the remainder of the film, exposing a portion of the product and/or allowing the product to be removed from the package. As in  FIG. 19 , in  FIG. 20  skirt  379  is provided with a plurality of tear initiators for use in a manner analogous to the manner described above for  FIG. 19 . 
       FIG. 21  is an enlarged detailed view of a portion of side seal bag  390  having side seal  392  outward of which is skirt  391  having first tear initiator  396  on first side  394  and second tear initiator  400  on second side  398 , with spot heat seals  402  and  404  at which first side  394  of skirt  391  is heat sealed to second side  398  of skirt  391 . Those portions of the skirt  391  within spot seals  402  and  404  are heatset. Moreover, a small area of film surrounding the spot seals is also heatset, as the heat from the sealing operation generally radiates outward, heatsetting more film than just the bonded areas. After placing a product into bag  390  and evacuating the atmosphere from within bag  390  and sealing across the top of bag  390  to seal the product within the package, the packaged product is typically passed through a hot air tunnel to shrink the film around the product. Heatsetting reduces the tendency of skirt  391  to shrink during shrinking of the remainder of the film surrounding the product. Heatsetting also reduces the curling of skirt sides  394  and  398  during the shrinking of the film. The diminished curling and diminished shrink resulting from the heatsetting of portions of skirt  391  provides improved identification and utilization of tear initiators  396  and  400  by a consumer of the package. 
       FIG. 22  is an enlarged detailed view of a portion of side seal bag  406  having side seal  408  outward of which is skirt  410  having tear initiator  412  and skirt  414  having tear initiator  416 , with spot heat seals  418  and  420  at which skirt  410  is heat sealed to skirt  414 . As with the embodiment of  FIG. 21 , those portions of the films within spot seals  418  and  420  are heatset, as are small areas of film surrounding the spot seals. In addition, the embodiment of  FIG. 22  has grip assisting holes having borders  422  and  424  in first skirt  410 , and respective grip assisting holes having borders  426  and  428  in skirt  414 . Grip assisting holes bounded by borders  422 ,  424 ,  426 , and  428  provide locations that are easier to grip for the purpose of initiating tears from tear initiators  412  and  416 . 
       FIG. 23  is an enlarged detailed view of a portion of side seal bag  430  having open top  431 , folded bottom edge  433 , side seal  432  outward of which is skirt  434  having a plurality of tear initiators  436 , skirt  438  having a plurality of tear initiators  440 , and a plurality of spot heat seals  442  and  444  on either side of each of tear initiators  436  and  440 , at which skirt  434  is heat sealed to skirt  438 . As with the embodiment of  FIG. 21 , those portions of the films within spot seals  442  and  444  are heatset, as are small areas of film surrounding spot seals  442  and  444 . In addition, the embodiment of  FIG. 23  has grip assisting holes having borders  446  on either side of each tear initiator  436  in first skirt  434 , and respective grip assisting holes having borders  448  on either side of each tear initiator  440  in skirt  438 . The embodiment of  FIG. 23  provides multiple locations of paired tear initiators  436  and  440  so that portions of the package can be torn off, leaving a remainder of the film around the product in the bag. For purposes of simplicity, only two pairs of tear initiators are illustrated in  FIG. 23 . 
       FIG. 24  illustrates a perspective view of a portion of a comparative packaged product  450  made by placing a product into an end seal bag, after which the atmosphere is evacuated from the bag and the bag sealed closed with a heat seal made across the top of the bag (not illustrated), with the film having been shrunk tight against the product. The bag has a skirt ( 452 ) below end seal ( 454 ), with skirt ( 452 ) having two lay-flat sides, with each lay-flat side being provided with a tear initiator ( 456 ) therethrough. While the end seal bag is provided with tear initiators in the form of slits through each lay-flat side of the bag skirt, during shrinkage of the film the tear initiator slits take on the somewhat “pointed oval” shape of tear initiators  456 , as illustrated in  FIG. 24 . The excess bag length has been trimmed off of the header (not illustrated) and the packaged product run through a shrink tunnel in which the film was heated and shrunk around the product. During shrinking of the film, skirt  452  undergoes substantially unrestrained free shrink and curling, thereby partially or fully obscuring tear initiators from direct view, making it more difficult to find and use the tear initiators. 
       FIG. 25  illustrates a perspective view of a portion of a packaged product  460  also made using an end seal bag from which the atmosphere is evacuated and the bag sealed closed with a heat seal made across the top of the bag (not illustrated), with the film having been shrunk tight against the product. Skirt ( 462 ) extends below end seal ( 464 ), with skirt ( 462 ) having two lay-flat sides, with each lay-flat side being provided with a tear initiator ( 466  and  468 , respectively). During the shrinking of the film, transverse shrinkage causes tear initiation slits to take on the somewhat pointed oval shape of tear initiators  466  and  468  of  FIG. 25 . Grip assisting holes defined by borders  470  and  474  are located on either side of tear initiator  466 , and grip assisting holes defined by borders  472  and  476  are located on either side of tear initiator  468 . The two lay-flat sides of skirt  462  are also heat sealed together at spot seals  478  and  480 . In addition to providing a mechanical bond of the lay-flat sides to one another to resist curling, the film is heatset in the region of spot seals  470  and  472 , and an area extending radially outward a short distance around each of spot seals  470  and  472  is also heatset. The heatsetting of these portions of skirt  462  reduces shrinking of the skirt during the shrinking of the film, causing skirt  462  to undergo less free shrink and curling than would occur without the heatsetting. As a result, it is apparent from  FIG. 25  that tear initiators  466  and  468 , as well as grip assisting holes defined by borders  470 ,  472 ,  474 , and  476 , are more readily identified and used by a consumer, due to less shrinkage and less curing, making it easier to find and use the tear initiators  466  and  468  than for the embodiment of  FIG. 24 . 
       FIG. 26  illustrates a perspective view of a portion of a packaged product  490  also made using an end seal bag from which the atmosphere is evacuated and the bag sealed closed with a heat seal made across the top of the bag (not illustrated), with the film having been shrunk tight against the product. As in the package of  FIG. 25 , packaged product  490  of  FIG. 26  has skirt  492  extending below end seal ( 494 ), with skirt ( 492 ) having two lay-flat sides, each of which is provided with a tear initiator ( 496  and  498 , respectively). Grip assisting holes defined by borders  500  and  502  are located on either side of tear initiator  496 , and grip assisting holes defined by borders  504  and  506  are located on either side of tear initiator  498 . The two lay-flat sides of skirt  462  are heat sealed together at four discrete spot seals:  508 ,  510 ,  512 , and  514 , each of which heatsets the film in the seal region as well as a region extending radially outward a short distance around each of the spot seals. The heatsetting of these portions of skirt  492  reduces shrinking of the skirt during the shrinking of the film, causing skirt  462  to undergo less free shrink and curling than would occur without the heatsetting. As a result, it is apparent from  FIG. 26  that tear initiators  496  and  498 , as well as grip assisting holes defined by borders  470 ,  472 ,  474 , and  476 , are even more readily apparent than in  FIG. 25 , making it still making it easier to find and use the tear initiators  466  and  468  than for the embodiment of  FIG. 25 . 
       FIG. 27  illustrates a perspective view of a portion of an alternative packaged product  520  also made using an end seal bag from which the atmosphere is evacuated and the bag sealed closed with a heat seal made across the top of the bag (not illustrated), with the film having been shrunk tight against the product. As in the package of  FIG. 25 , packaged product  520  of  FIG. 27  has skirt  522  extending below end seal ( 524 ), with skirt ( 522 ) having two lay-flat sides, each of which is provided with a tear initiator ( 526  and  528 , respectively). Grip assisting holes defined by borders  530  and  532  are located on either side of tear initiator  526 , and grip assisting holes defined by borders  534  and  536  are located on either side of tear initiator  528 . The two lay-flat sides of skirt  522  are heat sealed together at perimeter heat seal  538  that extends the full width of skirt  522  and is located near the bottom edge  540  of packaged product  520 . Perimeter heat seal  540  heatsets the portion of the film in the seal region as well as a region extending outward a short in both directions from the seal itself. 
     The heatsetting of this portion of skirt  522  reduces shrinking of the skirt during the shrinking of the film, causing skirt  522  to undergo less free shrink and curling than would occur without the heatsetting. As a result, it is apparent from  FIG. 27  that tear initiators  526  and  528 , as well as grip assisting holes defined by borders  530 ,  532 ,  534 , and  536 , are in a configuration to be more easily seen by a consumer, and more readily used by a consumer. It also helps a consumer distinguish the design and intended use of the package. Less curling, together with the opening up of the tear initiation slits, makes it easier to place fingers through the grip assist holes. Less curling and the opening up of the tear initiation slits also makes it easier to utilize automated machinery to open the package. Heatsetting makes it easier to detect, find, and use tear initiators  526  and  528  as well as the grip assisting holes defined by borders  530 ,  532 ,  534 , and  536 . The heat setting of particular areas prevents shrink of the tab, makes them easier to grip, and allows the notches to open into an easily seen oval holes. 
       FIG. 28  illustrates a lay-flat schematic view of an alternative embodiment of a side-seal bag  550  having first side seal  552 , second side seal  554 , skirts  556  and  558  outward of first side seal  552 , skirts  560  and  562  outward of second side seal  554 , open top  564 , and folded bottom edge  566 . Skirt  556  has a plurality of first tear initiators  568  and skirt  558  has a plurality of second tear initiators (not illustrated), with the plurality of first tear initiators  568  being positioned at intervals along skirt  556 , and the plurality of second tear initiators (not illustrated) being positioned at intervals along skirt  558 . Each individual tear initiator  568  in skirt  556  is paired with an individual tear initiator (not illustrated) in skirt  558 , to together provide a set of paired tear initiators. In  FIG. 28 , bag  550  is showing in lay-flat configuration, with each individual tear initiator  568  in skirt  556  being positioned directly over each individual tear initiator (not illustrated) in skirt  558 . The film is heatset along the hatched perimeter area  570  of skirt  556  as well as a corresponding area (not illustrated) of skirt  558 . Moreover, the film is heatset at hatched areas  572  and  574  along each side of each tear initiator  568 , as well as at corresponding areas (not illustrated) along each side of each corresponding tear initiator (not illustrated) in skirt  558 . While heatset areas  570 ,  572 , and  574  of skirt  556 , as well as corresponding heatset areas (not illustrated) of skirt  558  can be heated only enough to reduce the shrink of the areas, heatset areas  570 ,  572 , and  574  of skirt  556  and corresponding areas of skirt  558  can further be heat sealed to one another. The heatsetting (and also any heat sealing) results in reduced shrinkage of the heated regions, thereby making it easier to detect, find, and use tear initiators. In addition, skirts  556  and  558  can be provided with grip assisting holes (not illustrated) on one or both sides of the tear initiators. 
     Resins Utilized in the Examples 
     Unless otherwise indicated, the following listing of resins identifies the various resins utilized in Examples 1-35 below. 
     
       
         
           
               
               
               
               
               
               
             
               
                   
               
               
                   
                   
                 Generic Resin Name 
                   
                 Melt 
                   
               
               
                   
                   
                 {additional 
                 Density 
                 Index 
               
               
                 Resin code 
                 Tradename 
                 information} 
                 (g/cc) 
                 (dg/min) 
                 Supplier 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 ION 1 
                 Surlyn ® 
                 Zinc neutralized ethylene 
                 0.940 
                 14 
                 DuPont 
               
               
                   
                 1702-1 
                 methacrylic acid 
               
               
                   
                   
                 copolymer 
               
               
                 ION 2 
                 Surlyn ® 
                 Zinc neutralized ethylene 
                 0.950 
                 1.55 
                 DuPont 
               
               
                   
                 1650 SB 
                 methacrylic acid 
               
               
                   
                   
                 copolymer + slip additive 
               
               
                 SSPE 1 
                 Affinity ® 
                 Homogeneous 
                 0.900 
                 6.0 
                 Dow 
               
               
                   
                 1280G 
                 ethylene/alpha-olefin 
               
               
                   
                   
                 copolymer 
               
               
                 SSPE 2 
                 Affinity ® PL 
                 Homogeneous 
                  0.900 g/cc 
                 6.0 
                 Dow 
               
               
                   
                 1281G1 
                 ethylene/octene 
               
               
                   
                   
                 copolymer 
               
               
                 SSPE3 
                 Affinity ® PL 
                 Homogeneous 
                 0.902 
                 3.0 
                 Dow 
               
               
                   
                 1850G 
                 ethylene/octene 
               
               
                   
                   
                 copolymer 
               
               
                 SSPE4 
                 Affinity ® PF 
                 Homogeneous 
                 0.8965 g/cc 
                 1.6 
                 Dow 
               
               
                   
                 1140G 
                 ethylene/octene 
               
               
                   
                   
                 copolymer 
               
               
                 SSPE5 
                 DPF 1150.03 
                 Homogeneous 
                 0.901 
                 0.9 
                 Dow 
               
               
                   
                   
                 Ethylene/octene 
               
               
                   
                   
                 copolymer 
               
               
                 SSPE6 
                 Exceed ® 
                 Homogeneous 
                 0.918 
                 4.5 
                 Exxon 
               
               
                   
                 4518 PA 
                 Ethylene/hexene 
                   
                   
                 Mobil 
               
               
                   
                   
                 copolymer 
               
               
                 VLDPE 1 
                 XUS 
                 Very low density 
                 0.903 
                 0.5 
                 Dow 
               
               
                   
                 61520.15L 
                 polyethylene 
               
               
                 VLDPE 2 
                 Attane ® 4203 
                 Very low density 
                 0.905 
                 0.80 
                 Dow 
               
               
                   
                   
                 polyethylene 
               
               
                 VLDPE 3 
                 Rexell ® 
                 Very low density 
                 0.915 
                 6.6 
                 Huntsman 
               
               
                   
                 V3401 
                 polyethylene 
               
               
                 VLDPE 4 
                 ECD 364 
                 VLDPE (ethylene/hexene 
                 0.912 
                 1.0 
                 ExxonMobil 
               
               
                   
                   
                 copolymer) 
               
               
                 LLDPE 1 
                 Dowlex ® 
                 Linear Low Density 
                 0.920 
                 1.0 
                 Dow 
               
               
                   
                 2045.03 
                 Polyethylene 
               
               
                 LLDPE 2 
                 LL 3003.32 
                 Heterogeneous 
                 0.9175 
                 3.2 
                 Exxon 
               
               
                   
                   
                 Ethylene/hexene 
                   
                   
                 Mobil 
               
               
                   
                   
                 copolymer 
               
               
                 HDPE 
                 Fortiflex ® 
                 High density 
                 0.961 
                 6.0 
                 Ineos 
               
               
                   
                 T60-500-119 
                 polyethylene 
               
               
                 Ion&amp;Eva&amp;Pb 
                 Appel 
                 Blend of ionomer, EVA, 
                 0.932 
                 3.7 
                 DuPont 
               
               
                   
                 72D799 
                 and polybutylene 
               
               
                 EVA&amp;PP 
                 Versify 
                 Blend of EVA and 
                 0.89 
                 3.0 
                 Dow 
               
               
                   
                 XUR-YM 
                 Polypropylene 
               
               
                   
                 2006268985 
               
               
                 RECLAIM 
                 TO35B 
                 Recycled multilayer film 
                 — 
                 — 
                 Sealed 
               
               
                   
                   
                 containing wide variety 
                   
                   
                 Air Corp 
               
               
                   
                   
                 of polymers, including 
               
               
                   
                   
                 ionomer resin, ethylene 
               
               
                   
                   
                 homo- and co-polymers, 
               
               
                   
                   
                 propylene homo- and co- 
               
               
                   
                   
                 polymers, EVOH, 
               
               
                   
                   
                 polyamide, anhydride 
               
               
                   
                   
                 modified polymers, 
               
               
                   
                   
                 ionomer, antiblock, etc. 
               
               
                 PP1 
                 Inspire 112 
                 Propylene homopolymer 
                 0.9 
                 0.4 
                 Dow 
               
               
                 PP2 
                 Basell Pro- 
                 Propylene homopolymer 
                 0.902 
                 34 
                 Basell 
               
               
                   
                 Fax PH835 
                   
                   
                   
                 Polyolefins 
               
               
                 PP3 
                 PP3155 
                 Propylene homopolymer 
                 0.900 
                 36 
                 Exxon 
               
               
                   
                   
                   
                   
                   
                 Mobil 
               
               
                 PP4 
                 Escorene ® PP 
                 Propylene homopolymer 
                 0.900 
                 36.0 
                 Exxon 
               
               
                   
                 3445 
                   
                   
                   
                 Mobil 
               
               
                 PB 
                 PB8640M 
                 Butene homopolymer 
                 0.908 
                 1 
                 Basell 
               
               
                   
                   
                   
                   
                   
                 Polyolefins 
               
               
                 ssPP 
                 Eltex ® 
                 Propylene/ethylene 
                 0.900 
                 5.5 
                 Ineos 
               
               
                   
                 P KS 409 
                 copolymer 
               
               
                 znPP 
                 Escorene ® 
                 Propylene/ethylene 
                 0.902 
                 6.00 
                 Ineos 
               
               
                   
                 PP9012E1 
                 copolymer 
               
               
                 EPC 1 
                 Pro-Fas 
                 Propylene/ethylene 
                 0.902 
                 6.5 
                 Lyondell - 
               
               
                   
                 SA 861 
                 copolymer (single site 
                   
                   
                 basell 
               
               
                   
                   
                 catalyzed) 
               
               
                 Et—Pr TER 
                 Vistalon 
                 Ethylene-propylene diene 
                 0.870 
                 1.5 
                 Exxon 
               
               
                   
                 7800 
                 terpolymer 
                   
                   
                 Mobil 
               
               
                 MA-LLD 1 
                 Tymor ® 
                 Maleic anhydride 
                 0.921 
                 2.0 
                 Rohm &amp; 
               
               
                   
                 1228B 
                 modified polyethylene 
                   
                   
                 Haas 
               
               
                   
                   
                 {blended with linear low 
               
               
                   
                   
                 density polyethylene} 
               
               
                 MA-LLD 2 
                 PX 3227 
                 Maleic anhydride 
                 0.913 
                 1.7 
                 Equistar 
               
               
                   
                   
                 modified polyethylene 
                   
                   
                 Division of 
               
               
                   
                   
                 {blended with linear low 
                   
                   
                 Lyondell 
               
               
                   
                   
                 density polyethylene} 
               
               
                 MA-LLD 3 
                 PX3236 
                 Maleic anhydride 
                 0.922 
                 2.00 
                 Equistar 
               
               
                   
                   
                 modified polyethylene 
                   
                   
                 Division of 
               
               
                   
                   
                 {blended with linear low 
                   
                   
                 Lyondell 
               
               
                   
                   
                 density polyethylene} 
               
               
                 MA-EVA 
                 Bynel ® 3101 
                 Acid/Acrylate 
                 0.943 
                 3.2 
                 DuPont 
               
               
                   
                   
                 Anhydride-Modified 
               
               
                   
                   
                 Ethylene/Vinyl Acetate 
               
               
                   
                   
                 Copolymer 
               
               
                 modPP 
                 Admer ® 
                 Maleic anhydride 
                 0.900 
                 3.2 
                 Mitsui 
               
               
                   
                 QB510A 
                 modified polypropylene 
               
               
                 modEVA 
                 SPS-33C-3 
                 Compounded modified 
                 0.92 
                 1.6 
                 MSI 
               
               
                   
                   
                 EVA polymer blend 
                   
                   
                 Technology 
               
               
                 Et-Norb 1 
                 Topas ® 
                 Ethylene norbornene 
                 0.974 
                 1.0 
                 Topas 
               
               
                   
                 9506X1 
                 copolymer 
                   
                   
                 Advanced 
               
               
                   
                   
                   
                   
                   
                 Polymers 
               
               
                   
                   
                   
                   
                   
                 Inc. 
               
               
                 ET-Norb2 
                 Topas ® 8007 
                 Ethylene norbornene 
                 1.02 
                 1.7 
                 Topas 
               
               
                   
                 F-04 
                 copolymer 
                   
                   
                 Advanced 
               
               
                   
                   
                   
                   
                   
                 Polymers 
               
               
                   
                   
                   
                   
                   
                 Inc. 
               
               
                 Nylon 1 
                 Ultramid ® 
                 Polyamide 6 
                 1.13 
                 — 
                 BASF 
               
               
                   
                 B40 
               
               
                 Nylon 2 
                 Ultramid ® 
                 Polyamide 6 
                 1.14 
                 — 
                 BASF 
               
               
                   
                 B40LN01 
               
               
                 Nylon 3 
                 Ultramid ® 
                 Polyamide 6/66 
                 1.13 
                 — 
                 BASF 
               
               
                   
                 C33 01 
               
               
                 Nylon 4 
                 Grilamid XS 
                 Blend of Polyamide 6/12 
                 1.03 
                 — 
                 EMS- 
               
               
                   
                 1392 
                 and Polyamide 12 
                   
                   
                 Grivory 
               
               
                 EVA 1 
                 Escorene ® 
                 Ethylene/vinyl acetate 
                 0.933 
                 3.5 
                 Exxon 
               
               
                   
                 LD 713.93 
                 copolymer (14.4% VA) 
                   
                   
                 Mobil 
               
               
                 EVA 2 
                 Escorene LD 
                 Ethylene/vinyl acetate 
                 0.93 
                 2.0 
                 Exxon 
               
               
                   
                 318.92 
                 copolymer (8.7% VA) 
                   
                   
                 Mobil 
               
               
                 EVA 3 
                 Escorene ® 
                 Ethylene/vinyl acetate 
                 0.950 
                 5.75 
                 Exxon 
               
               
                   
                 LD 761.36 
                 copolymer (26.7% VA) 
                   
                   
                 Mobil 
               
               
                 EVA 4 
                 Escorene ® 
                 Ethylene/vinyl acetate 
                 0.935 
                 0.4 
                 Exxon 
               
               
                   
                 LD 705.MJ 
                 copolymer (12.8% VA) 
                   
                   
                 Mobil 
               
               
                 EVA 5 
                 Escorene ® 
                 Ethylene/vinyl acetate 
                 0.942 
                 2.55 
                 Exxon 
               
               
                   
                 LD 721.IK 
                 copolymer (18.5% VA) 
                   
                   
                 Mobil 
               
               
                 EVA 6 
                 Elvax ® 3175 
                 Ethylene/vinyl acetate 
                 0.950 
                 6 
                 DuPont 
               
               
                   
                   
                 copolymer (28% VA) 
               
               
                 EVA 7 
                 PE 1651 
                 Ethylene/vinyl acetate 
                 0.928 
                 0.5 
                 Flint Hills 
               
               
                   
                   
                 copolymer (6.5% VA) 
                   
                   
                 Resources 
               
               
                   
                   
                   
                   
                   
                 LP 
               
               
                 EBA 
                 SP 1802 
                 Ethylene/butyl acrylate 
                 0.928 
                 6 
                 Eastman 
               
               
                   
                   
                 copolymer (22.5% BA) 
                   
                   
                 Chemical 
               
               
                 EVOH 
                 Soarnol ® 
                 Hydrolyzed ethylene 
                 1.17 
                 3.2 
                 Nippon 
               
               
                   
                 ET3803 
                 vinyl acetate copolymer 
                   
                   
                 Gohsei 
               
               
                   
                   
                 (EVOH with 38 mol % 
               
               
                   
                   
                 ethylene) 
               
               
                 PVdC 
                 Saran ® 806 
                 Vinylidene chloride/ 
                 1.69 
                 — 
                 Dow 
               
               
                   
                   
                 methyl acrylate 
               
               
                   
                   
                 copolymer 
               
               
                 Sty-But 
                 Styrolux 
                 Styrene/butadiene 
                 1.02 
                 99 
                 BASF 
               
               
                   
                 656C 
                 copolymer 
               
               
                 AOX 
                  10555 
                 Antioxidant in linear low 
                 0.932 
                 2.5 
               
               
                   
                   
                 density polyethylene 
               
               
                 SLIP 1 
                 FSU 93E 
                 Slip and antiblock in low 
                 0.975 
                 7.5 
                 Schulman 
               
               
                   
                   
                 density polyethylene 
               
               
                 SLIP 2 
                 1062 Ingenia 
                 Slip masterbatch amide 
                 0.92 
                 2 
                 Ingenia 
               
               
                   
                   
                 wax (erucamide) in linear 
                   
                   
                 Polymers 
               
               
                   
                   
                 low density polyethylene 
               
               
                 WCC 
                  11853 
                 White color concentrate 
                 1.513 
                 2.90 
                 Ampacet 
               
               
                   
                   
                 in linear low density 
               
               
                   
                   
                 polyethylene 
               
               
                 CCC 
                 130374 
                 Cream color concentrate 
                 — 
                 — 
                 Ampacet 
               
               
                   
                   
                 in low density 
               
               
                   
                   
                 polyethylene 
               
               
                 BCC 
                 16417-81 
                 Blue color concentrate 
                 0.951 
                 — 
                 Colortech 
               
               
                   
                 blue 
                 masterbatch 
               
               
                 ABConc 
                 18042 
                 Optical brightener in 
                 0.92 
                 — 
                 Teknor 
               
               
                   
                 antiblock 
                 linear low density 
                   
                   
                 Color 
               
               
                   
                 concentrate 
                 polyethylene 
               
               
                 procAID1 
                 100458 
                 Processing aid: 
                 0.93 
                 2.3 
                 Ampacet 
               
               
                   
                   
                 fluoropolymer in 
               
               
                   
                   
                 polyethylene 
               
               
                 procAID2 
                 IP 1121 
                 Processing aid: 
                 0.92 
                 2 
                 Ampacet 
               
               
                   
                   
                 fluoropolymer in linear 
               
               
                   
                   
                 low density polyethylene 
               
               
                   
               
            
           
         
       
     
     Example 1 (Working) 
     An end-seal bag approximately 7 to 8 inches wide (lay-flat) and approximately 16 inches long was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, in the following order, with the thickness of each layer of the film shown in mils in the bottom row of each column representing a layer of the multilayer structure. The composition of each layer is provided in the second row, with each code corresponding with the composition in the resin table set forth above. 
     Example 1 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 80% 
                 70% 
                 100% 
                 PVDC 
                 100% 
                 70% 
                 85% 
               
               
                 SSPE1 
                 VLDPE2 
                 EVA1 
                   
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 20% 
                 30% 
                   
                   
                   
                 30% 
                 15% 
               
               
                 LLDPE 
                 EVA1 
                   
                   
                   
                 EVA1 
                 LLDPE 
               
               
                 2 
                   
                   
                   
                   
                   
                 1 
               
               
                 0.42 mil 
                 0.76 mil 
                 0.08 mil 
                 0.18 mil 
                 0.13 mil 
                 0.25 mil 
                 0.13 mils 
               
               
                   
               
            
           
         
       
     
     Both lay-flat sides of the skirt below the end-seal were manually slit (using scissors) about one to two inches from a side edge of the bag, the slit being in the machine direction, the slit extending from the bottom edge of the bag and across about 30 to 50 percent of the 1½ inch wide bag skirt, to produce first and second coincident tear initiators. The bag was then used to package a simulated product, after which it was tested for linear tearing in the machine direction after shrinking by immersion in 185° F. water. The simulated product was a simulated meat product, i.e., simulated by a sealed bag of water, the bag of water containing about 1300 milliliters of water in a heat-shrinkable bag having a lay-flat width of about 5½ inches and a length of about 9 inches, this bag having been sealed closed with the water therein (and minimal air) and thereafter immersed in water at 195° F. and shrunk tightly around the water to result in a simulated product having a substantially round cross sectional area. The bag of water was placed into the heat-shrinkable end-seal bag being tested, with the bag and simulated product then being placed into a vacuum chamber, and the atmosphere evacuated. The bag was then sealed closed and the resulting packaged product removed from the vacuum chamber and immersed in 185° F. water for about 5 seconds, during which the bag shrunk tightly around the simulated product. After removal from the hot water, the bag was allowed to stand for a period of at least 5 minutes, and thereafter a manual tear was made by grasping the shrunken skirt portion of the article on either side of the tear initiators. The manual machine direction tear test results are set forth in the table below, following the examples. 
     A plurality of side seal bags were produced using the film of Example 1. The bags had a lay-flat length of 13.5 inches and a lay-flat width of 6.25 inches. Each of the skirts had a width of 1 inch. Pairs of tear initiators were made at intervals of 1.5 inches down the full length of one of the skirts. Each of the tear initiators was a slit ⅝ inch long in the machine direction. 
     Example 2 (Working) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 2 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 80% 
                 70% 
                 100% 
                 PVDC 
                 100% 
                 70% 
                 80% 
               
               
                 SSPE2 
                 VLDPE1 
                 EVA1 
                   
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 20% 
                 30% 
                   
                   
                   
                 30% 
                 20% 
               
               
                 LLDPE 
                 EVA1 
                   
                   
                   
                 EVA1 
                 LLDPE 
               
               
                 2 
                   
                   
                   
                   
                   
                 1 
               
               
                 0.43 mil 
                 0.78 mil 
                 0.09 mil 
                 0.18 mil 
                 0.09 mil 
                 0.26 mil 
                 0.17 mils 
               
               
                   
               
            
           
         
       
     
     Example 3 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 4 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 3 (Comparative) 
     
       
         
           
               
               
               
               
               
             
               
                   
                   
               
               
                   
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
               
               
                   
                   
               
             
            
               
                   
                 100% 
                 100% 
                 100% 
                 100% 
               
               
                   
                 VLDPE3 
                 EVA2 
                 PVDC 
                 EVA 2 
               
               
                   
                 0.26 mil 
                 1.26 mils 
                 0.18 mil 
                 0.6 mil 
               
               
                   
                   
               
            
           
         
       
     
     Example 4 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 4 (Comparative) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 80% 
                 100% 
                 PVDC 
                 100% 
                 99% 
                 85% 
               
               
                 SSPE1 
                 VLDPE2 
                 EVA1 
                   
                 EVA3 
                 VLDPE2 
                 SSPE3 
               
               
                 10% 
                 20% 
                   
                   
                   
                  1% 
                 15% 
               
               
                 SLIP1 
                 LLDPE1 
                   
                   
                   
                 AOX 
                 LLDPE 1 
               
               
                 0.44 mil 
                 0.71 mil 
                 0.09 mil 
                 0.18 mil 
                 0.09 mil 
                 0.27 mil 
                 0.18 mils 
               
               
                   
               
            
           
         
       
     
     Example 5 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 5 (Comparative) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 80% 
                 80% 
                 100% 
                 PVDC 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE2 
                 VLDPE1 
                 EVA1 
                   
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 20% 
                 20% 
                   
                   
                   
                 20% 
                 20% 
               
               
                 LLDPE 
                 VLDPE4 
                   
                   
                   
                 VLDPE4 
                 LLDPE 
               
               
                 2 
                   
                   
                   
                   
                   
                 1 
               
               
                 0.46 mil 
                 1.11 mil 
                 0.09 mil 
                 0.18 mil 
                 0.09 mil 
                 0.28 mil 
                 0.18 mils 
               
               
                   
               
            
           
         
       
     
     Example 6 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 6 (Comparative) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 90% 
                 100% 
                 PVDC 
                 100% 
                 80% 
                 100% 
               
               
                 SSPE1 
                 SSPE5 
                 EVA1 
                   
                 EVA3 
                 SSPE5 
                 SSPE3 
               
               
                 10% 
                 10% 
                   
                   
                   
                 20% 
               
               
                 SLIP 2 
                 Et-PrTER 
                   
                   
                   
                 VLDPE1 
               
               
                 0.49 mil 
                 0.89 mil 
                 0.1 mil 
                 0.19 mil 
                 0.1 mil 
                 0.26 mil 
                 0.18 mils 
               
               
                   
               
            
           
         
       
     
     Example 7 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 7 (Comparative) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 100% 
                 100% 
                 100% 
                 PVDC 
                 100% 
                 100% 
                 85% 
               
               
                 ION 1 
                 EVA1 
                 EVA1 
                   
                 EVA3 
                 SSPE4 
                 SSPE3 
               
               
                   
                   
                   
                   
                   
                   
                 15% 
               
               
                   
                   
                   
                   
                   
                   
                 LLDPE1 
               
               
                 0.32 mil 
                 0.87 mil 
                 0.16 mil 
                 0.18 mil 
                 0.08 mil 
                 0.21 mil 
                 0.12 mils 
               
               
                   
               
            
           
         
       
     
     Example 8 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 4 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. 
     Example 8 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
               
               
                   
               
             
            
               
                   
                 100% 
                 84% 
                 85% 
                 85% 
               
               
                   
                 SSPE6 
                 LLDPE1 
                 EVA2 
                 EVA2 
               
               
                   
                   
                 16% 
                 15% 
                 15% 
               
               
                   
                   
                 CCC 
                 LLDPE1 
                 LLDPE1 
               
               
                   
                 0.25 mil 
                 1.09 mil 
                 0.76 mil 
                 0.25 mil 
               
               
                   
               
            
           
         
       
     
     Example 9 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 6 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. 
     Example 9 
     
       
         
           
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
               
               
                   
               
             
            
               
                 100% 
                 100% 
                 100% 
                 100% 
                 100% 
                 85% 
               
               
                 SSPE6 
                 VLDPE2 
                 EVA2 
                 EVA2 
                 VLDPE2 
                 EVA2 
               
               
                   
                   
                   
                   
                   
                 15% 
               
               
                   
                   
                   
                   
                   
                 LLDPE1 
               
               
                 0.31 mil 
                 0.8 mil 
                 0.09 mil 
                 0.13 mil 
                 0.4 mil 
                 0.27 mils 
               
               
                   
               
            
           
         
       
     
     Example 10 (Comparative) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 3 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. 
     Example 10 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 80% 
                 100% 
                 85% 
               
               
                 SSPE1 
                 EBA 
                 SSPE3 
               
               
                 20% 
                   
                 15% 
               
               
                 LLDPE2 
                   
                 LLDPE1 
               
               
                 0.08 mil 
                 1.84 mil 
                 0.08 mil 
               
               
                   
               
            
           
         
       
     
     Example 11 (Working) 
     An end-seal bag was made from a fully coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above, but without the extrusion coating step. The multilayer film had a total of 3 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 11 (Working) 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 100% 
                 75% 
                   75% 
               
               
                 EVA 6 
                 VLDPE2 
                 VLDPE2 
               
               
                   
                 25% 
                 16.5% 
               
               
                   
                 LLDPE1 
                 LLDPE1 
               
               
                   
                   
                  8.5% 
               
               
                   
                   
                 ABConc 
               
               
                 0.68 mil 
                 3.08 mil 
                 1.24 mil 
               
               
                   
               
            
           
         
       
     
     Example 12 (Working) 
     An end-seal bag marketed commercially by Curwood, Inc., under the name “Protite™ 34” was obtained from the marketplace. Analysis of the bag from which the multilayer film was made revealed the following layers, with the order, thickness, and composition being set forth in the table below. A small cut was made into the bag skirt, i.e., as illustrated in  FIG. 4A . The end-seal bag was tear-tested as set forth in Example 1. 
     Example 12 (Working) 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 Blend of EVA (3% vinyl 
                 Polyvinylidene 
                 Blend of EVA (3% vinyl 
               
               
                 acetate), LLDPE, and 
                 chloride 
                 acetate), LLDPE, and 
               
               
                 metallocene-catalyzed 
                   
                 metallocene-catalyzed 
               
               
                 ethylene/alpha-olefin 
                   
                 ethylene/alpha-olefin 
               
               
                 copolymer 
                   
                 copolymer 
               
               
                 1.53 mil 
                 0.21 mil 
                 0.74 mil 
               
               
                   
               
            
           
         
       
     
     Example 13 (Comparative) 
     An end-seal bag marketed commercially by Curwood, Inc., under the name “Cleartite™ 52” was obtained from the marketplace. Analysis of the bag from which the multilayer film was made revealed the following layers, with the order, thickness, and composition being set forth in the table below. A small cut was made into the bag skirt, i.e., as illustrated in  FIG. 4A . The end-seal bag was tear-tested as set forth in Example 1. 
     Example 13 (Comparative) 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 Blend of EVA (4% vinyl 
                 Polyvinylidene 
                 Blend of EVA (4% vinyl 
               
               
                 acetate), LLDPE, and 
                 chloride 
                 acetate), LLDPE, and 
               
               
                 metallocene-catalyzed 
                   
                 metallocene-catalyzed 
               
               
                 ethylene/alpha-olefin 
                   
                 ethylene/alpha-olefin 
               
               
                 copolymer 
                   
                 copolymer 
               
               
                 1.39 mil 
                 0.23 mil 
                 0.68 mil 
               
               
                   
               
            
           
         
       
     
     Example 14 (Comparative) 
     An end-seal bag marketed commercially by Curwood, Inc., under the name “Perflex™ 64” was obtained from the marketplace. Analysis of the bag from which the multilayer film was made revealed the following layers, with the order, thickness, and composition being set forth in the table below. A small cut was made into the bag skirt, i.e., as illustrated in  FIG. 4A . The end-seal bag was tear-tested as set forth in Example 1. 
     Example 14 (Comparative) 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 Blend of EVA (4% vinyl 
                 Polyvinylidene 
                 Blend of EVA (4% vinyl 
               
               
                 acetate), LLDPE, and 
                 chloride 
                 acetate), LLDPE, and 
               
               
                 metallocene-catalyzed 
                   
                 metallocene-catalyzed 
               
               
                 ethylene/alpha-olefin 
                   
                 ethylene/alpha-olefin 
               
               
                 copolymer 
                   
                 copolymer 
               
               
                 1.54 mil 
                 0.19 mil 
                 0.63 mil 
               
               
                   
               
            
           
         
       
     
     Example 15 (Comparative) 
     An end-seal bag marketed commercially by Asahi Corporation, under the name “SN3” was obtained from the marketplace. Analysis of the bag from which the multilayer film was made revealed the following layers, with the order, thickness, and composition being set forth in the table below. A small cut was made into the bag skirt, i.e., as illustrated in  FIG. 4A . The end-seal bag was tear-tested as set forth in Example 1. 
     Example 15 (Comparative) 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
               
               
                   
               
             
            
               
                 Polyethylene 
                 Ethylene/vinyl 
                 Polyvinylidene 
                 Ethylene/vinyl 
                 Low Density 
               
               
                 blend 
                 acetate 
                 chloride 
                 acetate 
                 Polyethylene 
               
               
                   
                 copolymer, 
                   
                 copolymer, 
                 (possibly a blend) 
               
               
                   
                 containing (15 
                   
                 containing (15 
                   
               
               
                   
                 wt % vinyl 
                   
                 wt % vinyl 
                   
               
               
                   
                 acetate mer) 
                   
                 acetate mer) 
                   
               
               
                 0.39 mil 
                 0.7 
                 0.35 mil 
                 0.66 
                 0.63 mil 
               
               
                   
               
            
           
         
       
     
     Example 16 (Working) 
     An end-seal bag marketed commercially by Pechiney Plastic Packaging, Inc., under the name “Clearshield™” was obtained from the marketplace. Analysis of the bag from which the multilayer film was made revealed the following layers, with the order, thickness, and composition being set forth in the table below. A small cut was made into the bag skirt, i.e., as illustrated in  FIG. 4A . The end-seal bag was tear-tested as set forth in Example 1. 
     Example 16 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 Metallocene- 
                 100% 
                 Blend of 
                 EVOH 
                 Blend of 
                 100% 
                 Blend of low 
               
               
                 catalyzed 
                 Ethylene/ 
                 polyamide 
                 (27 mol % 
                 polyamide 
                 Ethylene/ 
                 density 
               
               
                 ethylene/alpha- 
                 methyl 
                 6 with 
                 ethylene) 
                 6 with 
                 methyl 
                 polyethylene 
               
               
                 olefin copolymer 
                 acrylate 
                 polyamide 
                   
                 polyamide 
                 acrylate 
                 and linear low 
               
               
                 (possibly with 
                 copolymer 
                 6I, 6T 
                   
                 6I, 6T 
                 copolymer 
                 density 
               
               
                 LDPE or 
                   
                   
                   
                   
                   
                 polyethylene 
               
               
                 LLDPE) 
               
               
                 1.58 mil 
                 0.22 mil 
                 0.9 mil 
                 0.21 mil 
                 0.85 mil 
                 0.16 mil 
                 0.57 mil 
               
               
                   
               
            
           
         
       
     
     Example 17 (Working) 
     An end-seal bag was made from a coextruded, multilayer, heat-shrinkable film produced utilizing the apparatus and process set forth in  FIG. 8 , described above. The multilayer film had a total of 7 layers, with the order, thickness, and composition being set forth in the table below in a manner corresponding with the description in Example 1, above. The end-seal bag was tear-tested as set forth in Example 1. 
     Example 17 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Ion&amp;Eva&amp;PB 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     An end-seal bag was made from the coextruded, multilayer, heat-shrinkable films of each of Examples 18 through 35, below, using the apparatus and process set forth in  FIG. 5 , described above. Each of the multilayer films had a total of 7 layers, with the order, thickness, and composition being set forth in the tables below in a manner corresponding with the description in Example 1, above. The end-seal bags were tear-tested as set forth in Example 1. 
     An end-seal bag was made from the fully coextruded, multilayer, heat-shrinkable films of each of Examples 36-42, below, using the apparatus and process set forth in  FIG. 8 , described above, except that all layers were extruded from die head  122 , and no extrusion coating was employed. Each of the multilayer films of Examples 36-42 had the layer order, thickness, and composition set forth in the corresponding table below. The end-seal bags were tear-tested as set forth in Example 1. 
     Ten bags made from the film of Example 40 were filled with water and clipped. Before filling some of the bags with water, the header of the basgs were spot sealed. The bags were placed in a smokehouse for 12 hours at 195° F. After 12 hours, one of the bags had experienced a seal failure. Some bags had 2 spot seals and some had 4 spot seals. Spot seals improved the appearance of the header by preventing extreme curling of the header. The 4 spot seal bags had better appearance overall, making it easier to see the holes and slit of the header. 
     Example 18 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 EVA&amp;PP 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 19 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 75% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 EVA2 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 25% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 modEVA 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 20 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Et- 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 Norb2 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mil t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 21 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Et- 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 Norb1 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 22 (Comparative) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Sty-But 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 23 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 PP1 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 24 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Sty-But 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 EVA5 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 25 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 Sty-But 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 EVA2 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 26 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 VLDPE2 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 ET-Norb2 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 27 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 ssPP 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 SSPE3 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 28 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 ssPP 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 EVA2 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 29 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 80% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 SSPE3 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 20% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 WCC 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 30 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 ION 2 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 31 Working 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 EVA6 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 32 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 100% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 PB 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                   
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                   
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 33 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 85% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 SSPE1 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 15% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 RECLAIM 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 34 (Working) 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 70% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 SSPE1 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 30% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 RECLAIM 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 35 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
                 Layer 6 
                 Layer 7 
               
               
                   
               
             
            
               
                 90% 
                 55% 
                 50% 
                 100% 
                 100% 
                 80% 
                 80% 
               
               
                 SSPE1 
                 SSPE1 
                 EVA4 
                 PVdC 
                 EVA3 
                 VLDPE1 
                 SSPE3 
               
               
                 10% 
                 45% 
                 50% 
                   
                   
                 20% 
                 20% 
               
               
                 SLIP2 
                 RECLAIM 
                 LLDPE1 
                   
                   
                 VLDPE4 
                 LLDPE1 
               
               
                 3.0 mil t   
                 3.7 mil t   
                 11.4 mil t   
                 2.2 mil t   
                 1 mil t   
                 1.5 mils t   
                 1.5 t   
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 36 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
                 Layer 5 
               
               
                   
               
             
            
               
                 SSPE6 
                 70% 
                 EVA2 
                 70% 
                 85% 
               
               
                   
                 VLDPE4 
                   
                 VLDPE4 
                 EVA2 
               
               
                   
                 30% 
                   
                 30% 
                 15% 
               
               
                   
                 EVA1 
                   
                 EVA1 
                 LLDPE 1 
               
               
                 3.5 
                 9 
                 0.22 
                 4.5 
                 3 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 37 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 EPC 1 
                 70% 
                 80% 
               
               
                   
                 VLDPE4 
                 EVA-7 
               
               
                   
                 30% 
                 20% 
               
               
                   
                 EVA1 
                 HDPE 
               
               
                 5 
                 12 
                 5.5 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 38 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 98% 
                 70% 
                 80% 
               
               
                 EPC1 
                 VLDPE4 
                 EVA-7 
               
               
                  2% 
                 30% 
                 20% 
               
               
                 BCC 
                 EVA1 
                 HDPE 
               
               
                 5 
                 12 
                 5.5 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 39 
     
       
         
           
               
               
               
             
               
                   
               
               
                 Layer 1 
                 Layer 2 
                 Layer 3 
               
               
                   
               
             
            
               
                 EPC-1 
                 70% 
                 80% 
               
               
                   
                 VLDPE4 
                 EVA-7 
               
               
                   
                 28% 
                 20% 
               
               
                   
                 EVA1 
                 HDPE 
               
               
                   
                  2% 
                   
               
               
                   
                 BCC 
                   
               
               
                 5 
                 12 
                 3.5 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 40 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
               
               
                   
               
             
            
               
                   
                 Nylon 3 
                 MALLD-2 
                 70% 
                 80% 
               
               
                   
                   
                   
                 VLDPE4 
                 EVA-7 
               
               
                   
                   
                   
                 30% 
                 20% 
               
               
                   
                   
                   
                 EVA1 
                 HDPE 
               
               
                   
                 2.00 
                 1.00 
                 10.00 
                 3.50 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 41 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
               
               
                   
               
             
            
               
                   
                  98% 
                 MALLD-2 
                 70% 
                 80% 
               
               
                   
                 Nylon 3 
                   
                 VLDPE4 
                 EVA-7 
               
               
                   
                 2% 
                   
                 30% 
                 20% 
               
               
                   
                 BCC 
                   
                 EVA1 
                 HDPE 
               
               
                   
                 2 
                 1 
                 10 
                 3.5 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     Example 42 
     
       
         
           
               
               
               
               
               
             
               
                   
               
               
                   
                 Layer 1 
                 Layer 2 
                 Layer 3 
                 Layer 4 
               
               
                   
               
             
            
               
                   
                 Nylon 3 
                 MALLD-2 
                 70% 
                 80% 
               
               
                   
                   
                   
                 VLDPE4 
                 EVA-7 
               
               
                   
                   
                   
                 28% 
                 20% 
               
               
                   
                   
                   
                 EVA1 
                 HDPE 
               
               
                   
                   
                   
                  2% 
                   
               
               
                   
                   
                   
                 BCC 
                   
               
               
                   
                 2 
                 1 
                 10 
                 3.5 
               
               
                   
               
               
                   t thickness in table represents thickness of extrudate before solid state orientation at trapped bubble stage of process 
               
            
           
         
       
     
     A seamless film tubing of each of the films of Examples 1-35 is cut and sealed to form an end-seal bag. A small cut was made in the bag skirt, about 1 to 2 inches from the folded bag side edge. The bag skirt had a width of about 1.5 inches. A product was placed in the bag, and the bag was sealed closed and shrunk around the product. The resulting end-seal bags exhibit the following characteristics. 
     
       
         
           
               
             
               
                 TABLE 
               
             
            
               
                   
               
               
                 Results of Bag Testing 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                 Straight, 
                   
                   
                   
                   
               
               
                   
                   
                   
                 Full Length 
                   
                   
                   
                 Peak Load 
               
               
                   
                   
                   
                 Manual 
                   
                   
                   
                 Impact 
               
               
                   
                   
                 Free 
                 MD Tear 
                 LD Tear 
                 LD Tear 
                   
                 Strength 
               
               
                   
                 Total 
                 Shrink 
                 after 
                 Propagation 
                 Propagation 
                 LD Tear 
                 per mil, via 
               
               
                 Bag of 
                 Film 
                 at 185° F. 
                 shrinking in 
                 Max Load 
                 Energy to 
                 Resistance 
                 ASTM D 
               
               
                 Example 
                 Gauge 
                 (% MD/ 
                 water at 
                 (gmf, i.e., 
                 Break 
                 Max Load 
                 3763-95A 
               
               
                 No. 
                 (mils) 
                 % TD) 
                 185° F. 
                 grams force) 
                 (gmf-in) 
                 (gmf) 
                 (N/mil) 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 1 
                 2.0 
                 32/45 
                 Yes 
                 31 
                 — 
                 545 
                 98 
               
               
                   
                   
                   
                 (94.4%)*** 
                   
                   
                   
                   
               
               
                 2 
                 2.0 
                 35/51 
                 Yes 
                 23 
                 31 
                 598 
                 114* 
               
               
                   
                   
                   
                 (90.5%)*** 
                   
                   
                   
                   
               
               
                 3 
                 2.3 
                 — 
                 No 
                 22 
                 36 
                 673 
                  54.9* 
               
               
                   
                   
                   
                 (5%)*** 
                   
                   
                   
                   
               
               
                 4 
                 1.96 
                 — 
                 No 
                 31 
                 39 
                 566 
                   102.6* 
               
               
                   
                   
                   
                 (0%)*** 
                   
                   
                   
                   
               
               
                 5 
                 2.4 
                 — 
                 No 
                 54 
                 58 
                 791 
                 100* 
               
               
                   
                   
                   
                 (0%)*** 
                   
                   
                   
                   114.3* 
               
               
                   
                   
                   
                   
                   
                   
                   
                   137.2* 
               
               
                 6 
                 2.2 
                 — 
                 No 
                 61 
                 68 
                 625 
                   138.7* 
               
               
                   
                   
                   
                 (0%)*** 
                   
                   
                   
                   104.5* 
               
               
                 7 
                 1.9 
                 — 
                 No 
                 28 
                 34 
                 659 
                 102* 
               
               
                   
                   
                   
                 (0%)*** 
                   
                   
                   
                   
               
               
                 8 
                 2.35 
                 17/28 
                 — 
                 24.8 
                 — 
                 — 
                 113* 
               
               
                 9 
                 2.0 
                 26/42 
                 — 
                 — 
                 — 
                 — 
                 110* 
               
               
                 10 
                 2.0 
                 — 
                 — 
                 — 
                 — 
                 — 
                 — 
               
               
                 11 
                 5.0 
                 — 
                 Yes 
                 50 
                 86 
                 1470 
                 105* 
               
               
                 12 
                 2.18 
                 32/40 
                 Yes 
                 20 
                 38 
                 840 
                  116.3 
               
               
                 13 
                 2.03 
                 35/39 
                 No 
                 22 
                 35 
                 732 
                   73.9 
               
               
                 14 
                 2.18 
                  22/30* 
                 No 
                 23 
                 44 
                 732 
                 — 
               
               
                 15 
                 2.47 
                 50/50 
                 No 
                 279 
                 330 
                 685 
                   71.9 
               
               
                 16 
                 4.6 
                   
                 Yes 
                 284 
                 440 
                 3110 
                  155.0 
               
               
                 17 
                 2.42 
                 24/36 
                 Yes 
                 35 
                 — 
                 747 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 18 
                 2.48 
                 19/36 
                 Yes 
                 205 
                 — 
                 797 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 19 
                 2.48 
                 20/35 
                 Yes 
                 23 
                 — 
                 817 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 20 
                 — 
                 — 
                 Yes 
                 — 
                 — 
                 — 
                 — 
               
               
                 21 
                 2.56 
                 23/33 
                 Yes 
                 21 
                 30 
                 676 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 22 
                 2.53 
                 24/36 
                 Yes 
                 40 
                 — 
                 726 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 23 
                 2.53 
                 20/33 
                 Yes 
                 21 
                 29 
                 724 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 24 
                 2.5 
                 23/34 
                 Yes 
                 32 
                 47 
                 848 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 25 
                 2.5 
                 22/34 
                 Yes 
                 22 
                 35 
                 707 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 26 
                 2.51 
                 24/32 
                 Yes 
                 20 
                 27 
                 723 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 27 
                 2.39 
                 18/32 
                 Yes 
                 13 
                 23 
                 843 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 28 
                 2.36 
                 15/34 
                 Yes 
                 21 
                 — 
                 820 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 29 
                 2.39 
                 17/34 
                 Yes 
                 17 
                 30 
                 643 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 30 
                 2.29 
                 — 
                 Yes 
                 71.0 
                 81 
                 551 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 31 
                 2.31 
                 — 
                 Yes 
                 15.3 
                 — 
                 557 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 32 
                 2.18 
                 — 
                 Yes 
                 113.0 
                 140 
                 693 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 33 
                 2.55 
                 — 
                 Yes 
                 55.0 
                 50 
                 427 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 34 
                 2.41 
                 — 
                 Yes 
                 57.3 
                 55 
                 477 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 35 
                 2.45 
                 — 
                 Yes 
                 40.2 
                 46 
                 638 
                 — 
               
               
                   
                   
                   
                 (100%)** 
                   
                   
                   
                   
               
               
                 36 
                 2.0 
                 26/37 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 37 
                 2.34 
                 14/26 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 38 
                 2.4 
                 19/32 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 39 
                 2.4 
                 19/29 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 40 
                 2.4 
                 17/33 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 41 
                 2.4 
                 19/32 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
                   
                   
                   
                   
               
               
                 42 
                 2.4 
                 19/28 
                 Yes**** 
                 ″ 
                 ″ 
                 ″ 
                 ″ 
               
               
                   
                   
                   
                 (100%) 
               
               
                   
               
               
                 *impact strength tested on different sample of film with same designation 
               
               
                 **test results based on tearing 5 samples 
               
               
                 ***test results based on tearing 20 samples 
               
               
                 ****test results based on tearing 10 samples 
               
            
           
         
       
     
     The various preferred features in preferred embodiments of the invention as set forth above are useful in combination with one another. Any of the various preferred film compositions (e.g., blend of ethylene/hexene copolymer and ethylene/vinyl acetate copolymer) are preferred in combination with any one or more of the various preferred film properties (e.g., thickness of from 1.5 to 5 mils, peak load impact strength of from 50 to 250 Newtons, etc.) and/or in combination with any one or more preferred types of packaging articles (e.g., end-seal bag, etc).