Source: http://www.google.com/patents/US4589568?dq=5,815,488
Timestamp: 2016-08-27 16:01:26
Document Index: 733119617

Matched Legal Cases: ['art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 11', 'art 12', 'art 31', 'art 32', 'art 31', 'arts 32', 'art 31', 'art 31', 'art 11', 'art 31', 'art 32', 'art 31', 'art 11', 'art 31', 'art 32', 'art 11', 'art 12', 'art 11', 'art 11', 'art 35', 'art 36', 'art 36', 'art 35', 'art 35', 'art 36', 'art 35', 'art 19', 'art 19', 'art 1', 'art 1']

Patent US4589568 - Package - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA package obtained by superposing a sheetlike lid through the medium of a hot melt layer, on a tray provided along the edge of a recess therein with a sheetlike flange part, and then heat sealing the tray and the sheetlike lid at the sheetlike flange part. The heat sealed portion formed between the sheetlike...http://www.google.com/patents/US4589568?utm_source=gb-gplus-sharePatent US4589568 - PackageAdvanced Patent SearchPublication numberUS4589568 APublication typeGrantApplication numberUS 06/597,441Publication dateMay 20, 1986Filing dateApr 6, 1984Priority dateApr 23, 1983Fee statusLapsedAlso published asDE3413352A1, DE3413352C2, US4689099Publication number06597441, 597441, US 4589568 A, US 4589568A, US-A-4589568, US4589568 A, US4589568AInventorsHideyuki Ito, Nobuyasu TakanashiOriginal AssigneeTerumo Corp.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (38), Classifications (43), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetPackage
US 4589568 AAbstract
1. A package, comprising:a sheetlike lid having a hot melt layer; a tray member on which the hot melt layer of said lid is superposed, wherein said tray member is provided along the edge of a recess opening therein with a sheetlike flange part, and said tray member and said sheetlike lid are heat sealed at said sheetlike flange part, the heat sealed portion formed between said sheetlike flange part of said tray member and said sheetlike lid comprising at least one primary joined portion having one of said sheetlike parts strongly pressed down and partially buried in the other sheetlike part, and at least one secondary joined portion adjacent said primary joined portion having said sheetlike parts pressed down less strongly against each other than in said primary joined portion and at least on the inner side of said primary joined portion relative to the tray member in the direction of the cross section of said heat sealed portion for protecting said primary joined portion, wherein the distance from the edge of the inside surface of the wall of said tray member forming said recess opening, to the inner edge of said primary joined portion is at least 0.5 mm, and the width of said secondary joined portion is in the range of 0.1 to 10 mm. 2. A package according to claim 1, wherein two secondary joined portions are formed one each on opposite sides of said primary joined portion.
3. A package according to claim 1, wherein only one primary joined portion is formed.
4. A package according to claim 3, wherein two secondary joined portions are formed one each on opposite sides of said one primary joined portion.
5. A package according to claim 1, wherein said sheetlike lid is buried into said sheetlike flange part of said tray member.
6. A package according to claim 1, wherein said buried portion has a depth of at least 0.05 mm.
7. A package according to claim 2, wherein the partially buried part of said primary joined portion has a depth in the range of 0.1 to 0.4 mm.
8. A package according to claim 7, wherein the distance from the edge of the inside surface of the wall of said tray member forming said recess opening, to the inner edge of said primary joined portion is at least 1 mm.
9. A package according to claim 1, wherein two primary joined portions are formed parallelly to each other.
10. A package according to claim 9, wherein said hot melt layer is superposed or deposited on said sheetlike lid.
11. A package according to claim 1, wherein said tray member is formed of a laminated sheet comprising a layer of polyolefin, an intermediate layer impervious to gas and steam, and another layer of polyolefin, said lid is formed of a laminated sheet comprising of a layer of polyamide, a layer impervious to gas and steam, and a layer resistant to the heat of heat sealing, in the order mentioned, and said hot melt layer is superposed or spread on the polyamide layer side.
12. A package according to claim 11, wherein the polyolefin layer in the laminated sheet of said tray member facing said lid is formed of polypropylene and said hot melt layer is formed of a blend of polyethylene and polypropylene.
13. A package according to claim 1, wherein said lid is in a peelable state relative to said tray member.
Most packages used for accommodating and preserving various articles or substances as described above have their peripheral edges sealed by heating with hot metal dies, high-frequency induction heating or ultrasonic heating. The heat sealing of the peripheral edge of a given package is accomplished, for example as ilustrated in FIG. 1, by interposing between a lower metal die 1 and a heat sealing upper metal die 2, a lower sheet 3 and an upper sheet 5 having a hot melt layer 4 superposed or deposited on the lower sheet 3 side surface thereof and placed on top of the lower sheet 3, and subsequently pressing the upper metal die 2 down against the lower metal die 1 thereby fusing the two sheets 3, 5 along the peripheral edges thereof. The heat sealing upper metal die 2 conventionally used for this heat sealing usually has a land or flat surface.
The objects described above are accomplished by providing a package produced by superposing a sheetlike lid through the medium of a hot melt layer, on a tray member provided along the edge of a recess therein with a sheetlike flange part, and then heat sealing the tray member and the sheetlike lid at the sheetlike flange part. The heat sealed portion formed between the sheetlike flange part of the tray member and the sheetlike lid is comprised of at least one primary joined portion having one of the aforementioned sheetlike parts strongly pressed down and partially buried in the other sheetlike part, and at least one secondary joined portion adjacent said primary joined portion having the sheetlike parts pressed down less strongly adjacent each other than in the primary joined portion. The secondary portion is at least on the inner side of the primary joined portion toward the tray recess, relative to the direction of the cross section of the heat sealed portion, thus serving to provide protection for the primary joined portion.
Further, this invention embraces a method which uses a heat sealing metal die having two secondary press parts formed one each on the opposite sides of the primary press part. It also embraces a method which uses a heat sealing metal die having one primary press part and preferably two secondary press parts formed one each on the opposite sides of the primary press part. It further embraces a method wherein the heat sealing metal die is pressed down from the sheetlike lid side. The invention embraces a method wherein the secondary press part is a curved surface continuing into the leaing end of the primary press part. It also embraces a method wherein the distance from the leading end of the secondary press part to the leading end of the primary press part is in the range of 0.05 to 5 mm, preferably 0.1 to 0.4 mm. It further embraces a method wherein the distance from the shortest section of the secondary press part to the leading end of the primary press part is in the range of 0.05 to 0.4 mm. Further this invention embraces a method wherein the width of each of the primary press parts is 0.05 to 5 mm, preferably 0.1 to 0.04 mm and the width of each of the secondary press parts is 0.1 to 10 mm, preferably 0.1 to 5 mm. It also embraces a method wherein two primary press parts are disposed parallelly to each other. It further embraces a method wherein the heat sealing metal die is pressed down from the sheetlike flange side of the tray member.
Now, the package of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, a package intended to accommodate and preserve a medical container will be depicted by way of illustration. This invention is not limited to this particular package.
The expression "heat seal" as used in this invention refers to an operation for thermally fusing two members through the medium of a hot melt material. As means for effecting this thermal fusion, there may be cited heating by the use of hot metal dies, high-frequency induction heating, and ultrasonic heating. The expression "thickness of the joined part" as used in this invention refers to the sum of the thickness of the flange part of the tray member, the thickness of the hot melt layer, and the thickness of the sheetlike lid as measured in the joined part of the package.
A package for the storage of a medical container according to this invention includes a tray part 12 provided round the opening thereof with a flange portion 11, having a recess portion 13 for receiving a deoxidizer 17 formed in at least one side thereof if necessary, for example, the bottom side, and further at least one groove 14 formed in the bottom portion of the recess portion as illustrated in FIGS. 4-6. Within this deoxidizer receiving portion 13, the deoxidizer 17 covered on at least one side thereof with a gas-impervious sheet 15 such as aluminum foil, synthetic resin film, paper or cloth impregnated or coated with wax or synthetic resin and on at least one other side thereof, generally the side opposite the aforementioned side, with a gas-previous sheet 16 such as paper or cloth, is received in such a manner that the gas-previous sheet 16 is positioned on the groove 14 side. The groove 14 is formed so as to reach the outside of the deoxidizer receiving portion 13 and form a free passage for gases. After the deoxidizer 17 and a medical container 18 have been set in position within the tray part 12, a lid 20 is heat sealed through the medium of the hotmelt adhesive layer 19 to the tray part 12 to be peeled open later.
In the package of the present invention for the storage of the medical container, any of materials which are capable of providing a barrier to passage of gases and steam and are highly heat sealable can be used for the tray part 12 and the lid member 20. Examples are shown below. They are particularly excellent in shape-retaining property, ability to bar passage of gases and steam and heat sealability, and are transparent. As illustrated in FIG. 6, the tray part 12 is produced by molding in the shape of a tray a laminated sheet comprising a polyolefin layer (outer layer) 21, a layer capable of barring passage of gases and steam (intermediate layer) 22 and a polyolefin layer (inner layer) 23. The lid 20 is formed by laminating a polyamide layer (inner layer) 24, a layer capable of barring passage of gases and steam (intermediate layer) 25 and a layer possessed of thermal resistance enough to withstand the conditions of heat sealing (outer layer) 26. The hotmelt adhesive layer 19 is formed of a blend of polyethylene with polypropylene.
Examples of the polyolefin which forms the outer layer 21 and the inner layer 23 of the tray part 12 are polyethylene and polypropylene. Polypropylene is preferred because of its excellence in shape-retaining property and thermal resistance over polyethylene. To be used advantageously herein, the polyethylene is required to have a molecular weight of 3,000 to 200,000, preferably 50,000 to 100,000, and the polypropylene to have a molecular weight of 5,000 to 1,000,000, preferably 100,000 to 500,000. The thickness of each of the polyolefin layers is 500 to 600 μm. The intermediate layer 22 of the tray part 12 which is capable of barring passage of gases and steam is desired to be formed of ethylene-vinyl alcohol copolymer. The thickness of this layer is about 50 μm. The vinyl alcohol content of the copolymer is desired to be 20 to 80 mol%, preferably 40 to 70 mol%. The molecular weight of the copolymer is desired to be 5,000 to 100,000, preferably 10,000 to 50,000.
The hotmelt layer constituting the inner layer 24 of the lid member 20 is desired to be formed of a blend of polyethylene with polypropylene. The weight ratio of the polyethylene to the polypropylene in the blend, when the outer layer 21 of the tray part 12 is made of polypropylene, is desired to fall in the range of 20:80 to 50:50 from the standpoint of both heat sealability and peel openability of the tray part. The thickness of the inner layer 24 is 30 to 60 μm, preferably 40 to 50 μm. This layer of the blend is superposed by a layer of polyamide, such as, for example, a layer of nylon 6 or nylon-6,6. This nylon layer permits the lid member to retain its strength. The intermediate layer 25 which is capable of barring passage of gases and steam is desired to be formed of polyvinylidene chloride or ethylene-vinyl alcohol copolymer. Generally, polyvinylidene chloride is used as superposed on a polyolefin film, particularly a biaxially drawn polypropylene film. Generally the molecular weight of the polyolefin is 5,000 to 1,000,000 preferably 100,000 to 500,000. The thickness of the polyolefin film is 20 to 40 μm. The molecular weight of the aforementioned polyvinylidene chloride is 8,000 to 20,000, preferably 10,000 to 15,000, and the thickness of the polyvinylidene chloride film is 5 to 10 μm. This film exhibits an outstanding ability to bar passage of gases and steam. A still better barrier property is obtained by using a plurality of such layers capable of barring passage of gases and steam in a superposed form. To ensure safe storage of a plastic medical container holding a medicinal fluid therein, the intermediate layer 25 is desired to have not more than 1 g/m2.24 hr (40� C., 90% RH), preferably 0.1-0.2 g/m2.24 hr (40� C., 90% RH), of perviousness to humidity. To ensure prevention of growth of aerobic microorganisms, the gas barrier property of the intermediate layer 25 is desired to be not more than 0.1%/72 hr, preferably not more than 0.1%/50 hr of oxygen concentration within the package. Examples of a resin of the outer layer which is possessed of thermal resistance enough to withstand the conditions of heat sealing, include polyesters such as polyethylene teraphthalate and polybutylene teraphthalate, polyamides such as nylon 6 and nylon 6,6 and polypropylene. Among the polymers mentioned above, polyethylene teraphthalate proves to be particularly desirable. The thickness of the outer layer is 10 to 30 μm, preferably 12 to 25 μm.
In the package of the present invention, the heat sealed part to be formed between the flange part 11 of the tray part 12 and the lid 20 consists of a primary joined part 31 and one secondary joined part 32 formed on the inside of the primary joined part 31, or two secondary joined parts 32 formed one each on the opposite sides of the primary joined part 31 as illustrated in an exaggerated manner in the partially enlarged diagram of FIG. 7. In the aforementioned primary joined part 31, because of the strong pressure exerted by the metal dies during the course of heat sealing, the hot melt material is fused and, at the same time, a depression is formed in the flange part 11, and the lid 20 is partly buried in this depression. Thus, the primary joined part 31 generally has a wall thickness slightly less than any other part. The secondary joined part 32 on one side or on either side of the primary joined part 31 is formed by causing parts of the materials of the lid 20 and the flange part 11 fused or softened in the primary joined part 31 to flow out and, by virtue of capillary action, fill up the gap between the partly fused parts of the lid and the flange part. Thus, the secondary joined part 32 has been pressed less strongly and consequently finished in a large wall thickness. Unlike the conventional package, the package produced by this invention neither produces any burr nor suffers occurrence of a thin wall near the sheet-joined part as illustrated in FIG. 3.
Now, the method to be adopted for the manufacture of a package of the construction described above will be explained with reference to FIGS. 8 and 9. Specifically, this package is manufactured by heat sealing the flange part 11 of the tray part 12 and the sheetlike lid 20 by the use of metal dies constructed as illustrated in FIGS. 8 and 9. The lower metal die 33 is applied to the lower side of the flange part 11 and the heat sealing upper metal die 34 is pressed down against the upper side of the lid 20. The heat sealing upper metal die 34 is disposed along the aforementioned flange part 11 and, as plain in the cross sectional shape illustrated in FIG. 8, is provided with at least one primary press part 35 (one in FIG. 8) having a flat leading end and one secondary press part 36 disposed at least on the inner side of the primary press part (one each on either side in FIG. 8) and having a slightly shorter leading end (of flat surface, for example) than the primary press part. In this heat sealing upper metal die 34, the distance A between the leading end of the secondary press part 36 and the leading end of the primary press part 35 falls in the range of 0.05 to 5 mm, preferably in the range of 0.1 to 0.4 mm. The width B of each primary press part 35 is in the range of 0.1 to 10 mm, preferably in the range of 0.1 to 5 mm. The width C of each secondary press part 36 is in the range of 0.1 to 10 mm, preferably in the range of 0.1 to 5 mm. Just one primary press part 35 does not always suffice. Any number of primary press parts may be used to suit the particular occasion. Further, the primary press part is not limited to the one shown in the drawing, but it may be a triangle shape projected to lower portion in cross section.
When the package finished by the heat sealing described above is accommodating a medical container or other similar article, the heat sealed part 19 is required to resist impacts or manifest a gas barrier property when necessary. On the other hand, this heat sealed part 19 is required to be readily separable by peeling to permit removal of the medical container from the package. In the heat sealed part obtained by this invention, the primary joined part formed at the center is produced because the powerfully pressed portions of the materials of the flange part and the lid are fused and joined intimately. By virtue of the pressure, the lid can be partially buried in the flange part of the tray part to ensure the stability of the formed seal. Since the secondary joined part is formed under a slightly smaller pressure, it is opened more readily by peeling than the primary joined part. Thus, the secondary joined part constitutes itself the part for starting the opening of the package. It further serves to prevent the primary joined part form acquiring a wall thickness reduced to an excessive extent and, at the same time, improve the resistance of the joined part to impacts. The openability of the package is sufficient because the tray part and the lid are made of materials which permit ready peeling.
A blood bag was set in place inside a tray molded of a laminate consisting of a layer of polypropylene (outer layer) 500 μm in thickness, a layer of ethylene-vinyl alcohol copolymer (intermediate layer) 50 μm in thickness, and a layer of polypropylene (inner layer) 500 μm in thickness. Then, a flat lid produced by laminating a layer of polyamide (inner layer) 15 μm in thickness, a layer of polyvinylidene chloride (intermediate layer) 10 μm in thickness, and a layer of polyethylene terephthalate (outer layer) 20 μm in thickness was heat sealed, through the medium of a layer of polyolefin (a 65:25 mixture of polyethylene and polypropylene) deposited as a hot melt material on the lid, with the tray by the use of metal dies 34 having a land 3 mm in width (width of primary joined part 1 mm and width of each secondary joinded part 1 mm) as illustrated in FIG. 7.
In the packages produced as described above, the joined parts had seal strength of 1 to 1.5 kg. These joined parts were tested for peel strength and for strength against impacts of fall. The test for strength against impacts of fall was conducted by dropping a given package from a height of 10 m. Any package which, on landing on the floor, sustained even a slightest peeling in the joined part was reported as one broken. The results were as shown in Table 1.
From the test results given above, it is noted that the packages produced in the working example of this invention exhibited the smallest yet ample peel strength enough to ensure ready peeling of the joined parts, and sustained no breakage under impacts of fall. These results testify that the present invention provides packages with improvement in peeling strength and strength to withstand breakage under impacts of fall.
Where two secondary joined parts formed in a larger wall thickness under less powerful pressure occur, one each on the opposite sides of one primary joined part, they serve to prevent the primary joined part acquiring a wall thickness reduced to an excessive extent and, at the same time, protect the primary joined part from the opposite sides. As the result, the boundaries of the primary joined part are prevented from losing wall thickness and strength or sustaining pinholes, and are enabled to acquire enhanced resistance to impacts.
When the package is constructed of the specific laminates described above, the tray enjoys high shape-retaining property and high transparency owing to the attributes of the polyolefin layers constituting the inner and outer layers of the laminate, exhibits an outstanding gas barrier property owing to the imperviousness to gas and steam exhibited by the ethylene-vinyl alcohol copolymer layer, and possesses transparency. Since the lid is constructed as described above, it possesses ample strengh yet permits ready peeling owing to the attributes of the layer of polyamide such as nylon, exhibits high imperviousness to gas and steam owing to the use of a layer impervious to gas and steam such as, for example, the layer of polyvinylidene chloride or the layer of ethylene-vinyl acetate copolymer, and preserves ample shape-retaining property even after heat sealing owing to the use of polyester, polyamide, or polypropylene as the material for the outer layer expected to withstand the heat during the course of heat sealing. Because all of these component layers of the lid are transparent, the lid enables the contents of the package to be clearly inspected from outside. When the polyolefin layer in the laminate of the tray is formed of polypropylene and the polyolefin layer (inner layer) 24 in the laminate of the lid is formed of a hot melt adhesive agent, specifically a blend of polyethylene and polypropylene, and these two polyolefin layers are produced in a weight ratio of 20:80 to 50:50, the joined part possesses ample adhesive strength and yet permits ready peeling.
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KGSealed container for food productsWO2009058825A1 *Oct 29, 2008May 7, 2009Novartis AgPackaging seal plate having a shaped face* Cited by examinerClassifications U.S. Classification220/359.3, 220/359.4, 229/125.35International ClassificationB65D6/32, B29C65/02, B29C65/76, B65B7/28, B65B51/10, B32B27/08, A61J1/16, B65D77/20Cooperative ClassificationB29C66/71, B29C66/72321, B29C66/723, B29C66/72341, B29C66/72328, B29C66/24244, B29C65/18, B29C65/08, B29C66/8322, Y10T156/16, B29C66/112, B29C66/81419, B29C66/81427, B29C66/131, B32B27/08, B29L2031/712, B65D2577/2025, B65D77/2024, B65D2577/2066, A61M2207/00, B29C65/76, A61J1/16, B29C65/02, B29C66/53461, B29C66/81413, B29C66/81435, B29C66/232European ClassificationB65D77/20E, B29C65/02, B29C66/80, B32B27/08, A61J1/16Legal EventsDateCodeEventDescriptionApr 6, 1984ASAssignmentOwner name: TERUMO KABUSHIKI KAISHA T/A TERUMO CORPORATION, 44Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:ITO, HIDEYUKI;TAKANASHI, NOBUYASU;REEL/FRAME:004247/0628;SIGNING DATES FROM 19840330 TO 19840402Nov 9, 1989FPAYFee paymentYear of fee payment: 4Nov 3, 1993FPAYFee paymentYear of fee payment: 8Feb 14, 1998REMIMaintenance fee reminder mailedMay 17, 1998LAPSLapse for failure to pay maintenance feesJul 28, 1998FPExpired due to failure to pay maintenance feeEffective date: 19980520RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services