Abstract:
A trash bag capable of being secured to a receptacle includes a trash bag body having a bag mouth, a hem formed proximate the mouth and a drawtape contained within the hem to close the bag. At least one elastic member, such as one or more elastic strands or bands, is adhesively attached to the drawtape and elastically secures the mouth to the receptacle. A method of making a trash bag includes adhesively attaching an elastic member to the trash bag body or drawtape proximate the bag mouth while the elastic member is in a stretched state. When released, the elastic member returns to an unstretched state and the bag gathers along the elastic member thereby providing a stretchable region adjacent the mouth.

Description:
[0001]     This application is a divisional of co-pending U.S. application Ser. No. 10/285,233 filed Oct. 31, 2002, the disclosure of which is fully incorporated herein by reference in its entirety. 
     
    
     FIELD OF THE INVENTION  
       [0002]     This invention relates generally to plastic trash bags and, more specifically, to trash bags having a securing system that enables the trash bag to be securely fitted to an upper portion of a trash container.  
       BACKGROUND OF THE INVENTION  
       [0003]     Trash bags are typically formed from two panels of thermoplastic materials that are sealed along opposing vertical sides. The horizontal seam along the bottom of the panels is also sealed. The top side of the panels, however, is not sealed and provides an opening or mouth for access to the interior of the bag. The trash bag is inserted as an interior liner of a formed container or receptacle. The bag mouth is then loosely laid over the top end of the receptacle to provide an unobstructed opening for inserting trash into the bag.  
         [0004]     A differentiating feature in many trash bag designs, however, is the bag closure system. In the typical trash bag closure system, the bag adjacent to the opening is gathered together at a point some distance below the mouth. If there is sufficient bag length above the gathering point, this length may be tied into a knot to secure its contents. Otherwise, a separate bag tie may be used to secure the bag from reopening. Typical bag ties are paper coated flexible wires or a plastic strip with a self-adjusting locking mechanism. Having separate tie mechanisms is often undesirable due to the additional expense in manufacturing and the inconvenience they cause the consumer.  
         [0005]     One way to avoid these problems is to have a closure system integral to the overall bag design. One particular integral bag closure system includes tie members that are simple extensions of the bag body. In this system, an extra length of plastic integral to the bag body extends above the mouth on opposing sides of the bag. Now instead of gathering the plastic at a point below the mouth, the mouth may in essence become the gathering point and the two lengths of plastic extending upwardly from the mouth are used to tie a knot in order to secure the bag contents.  
         [0006]     Another integral bag closure system includes a drawtape or drawstring internal to a hem formed along the mouth of the bag to form a so-called cinch. The hem may be formed by folding the plastic of the bag body over itself a short length and heat sealing the seam with the drawtape/drawstring internal to the hem. In this design, the hem is provided with one or more access holes that allow the drawtape/drawstring to be pulled through, gathering the bag along its mouth to secure its contents. The drawtape/drawstring advantageously serves as a handle for which to carry the bag. Furthermore, if two access holes are provided, the drawtape can then be tied together in a knot to ensure that the contents stay inside the bag while also providing a handle for which to carry the bag.  
         [0007]     One shortcoming of traditional trash bags as well as trash bags with integral closure systems is the securing of the bag mouth to the opening of the receptacle. For many trash bags, the bag mouth is loosely laid over the container edge. When consumers fill the trash bag, the bag mouth often becomes detached from the formed container and consequently falls down inside the container. This may occur from the shear weight of the inserted trash or from simply dragging the mouth into the bag as the consumer repeatedly inserts trash into the bag. The consumer must then pick up the bag relative to the container and put the mouth back over the top edge of the container. Otherwise, the consumer risks missing the inside of the bag completely and having trash in immediate contact with the inside surface of the container. This defeats the purpose of the bag and creates a nuisance for the consumer.  
         [0008]     A mouth securing system has been proposed to overcome this shortcoming by inserting an elastic ring inside a hem formed along the mouth of the bag. The ring or loop element is not attached to the bag but instead just freely floats within the formed hem. The ring may be completely made from elastic material or have only a portion made from elastic material. This mouth securing system may be used with a cinch-type closure system. A number of disadvantages exist in this design. First, because the elastic ring is not attached to the bag, it requires that a hem be formed along the mouth of the bag which adds to the manufacturing cost of the bag. Without the hem, the ring would simply slide off the bag in its unstretched state. Second, this design requires that the loop completely traverse the mouth of the bag. Again, because the elastic ring is free floating and not attached to the bag, stretching along the mouth can only occur if the ring forms a closed loop. Anything less than a closed looped ring would not be effective in this design.  
         [0009]     Another mouth securing system has been proposed that augments a closure system utilizing a drawtape design with an elastic member adhered to the drawtape. In essence, the securing system is incorporated into the closure system. In this design, a section of the drawtape is gathered into folds forming a plurality of crests and troughs. An unstretched elastomeric strip is then attached to the troughs of the gathered drawtape. This provides the drawtape with a level of elasticity related to the length of drawtape attached to the elastic strip. When the drawtape is stretched, the elastic strip stretches moving the drawtape crests closer to the troughs. The drawtape may stretch until the crests and troughs are substantially coplanar. Any further stretching results in plastic deformation of the drawtape just as if there were no elastic member. The augmented drawtape is incorporated within a hem about the mouth of the bag as previously discussed. For this design to be effective as a way to secure the bag mouth to the receptacle, the unstretched mouth opening must be smaller than the receptacle opening. In this way, the mouth must then be stretched to cover the container opening, thus creating an elastic restoring force that secures the bag to the receptacle.  
         [0010]     This design, however, also has some disadvantages. First, this mouth securing system is limited to trash bag designs having closure systems that employ drawtapes or drawstrings. This is a significant disadvantage because the drawtape manufacturing process is more expensive, requires additional materials, and requires more steps than other closure systems. Furthermore, this design attaches the elastic member to the drawtape at discrete locations along the drawtape, i.e., at the troughs of the gather sections, which complicates the manufacturing process and thereby may add cost to the bag.  
         [0011]     Therefore, a need exists for a system that secures the mouth of a trash bag to a container but that overcomes the disadvantages of the previous designs and additionally works with a host of closure systems.  
       SUMMARY OF THE INVENTION  
       [0012]     The present invention overcomes the foregoing and other shortcomings and drawbacks of securing systems designed to secure trash bags to receptacles. While this invention will be described in connection with certain embodiments, it will be understood that the invention is not limited to these embodiments. On the contrary, the invention includes all alternatives, modifications, and equivalents as may be included within the spirit and scope of the present invention.  
         [0013]     The present invention discloses a securing system utilizing elastic strands, or alternatively elastic bands, adhesively attached to a trash bag and extending along the bag mouth. There may be one or more elastic strands or bands of various lengths that encircle the entire bag or only a selected portion thereof. The elastic strands or bands are adhesively attached to the bag while the strands or bands are stretched, or elongated. The adhesive may be applied to the strands or bands in a continuous manner or at discrete points along the strands or bands. By way of example, the adhesive may be applied as a spray, a continuous band, a continuous swirl, an omega swirl or as multiple dots. When the strands or bands are allowed to return to their unstretched state, the bag gathers along the strands or bands thereby providing a stretchable region along the mouth of the bag. The trash bag and attached elastic strands or bands are configured so that when the strands or bands are unstretched, the bag mouth is smaller than the receptacle opening, but when the elastic strands or bands are stretched, the bag mouth is larger than the receptacle opening. With this design, a consumer inserts a bag into a receptacle, stretches the bag mouth to be larger than the receptacle opening, places the bag mouth over the receptacle opening, and then releases the bag. The elastic strands or bands retract creating a restoring force along the bag mouth that secures the bag to the receptacle.  
         [0014]     The elastic strands or bands may be placed along the mouth of the bag in several different configurations. In accordance with one aspect of the present invention, a single strand or band completely encircles the mouth of the bag as a ring proximate the bag mouth. In accordance with another aspect of the present invention, multiple strands or bands that completely encircle the bag mouth as rings may be placed adjacent each other proximate the bag mouth to further secure the bag to the receptacle. In accordance with yet another aspect of the present invention, multiple elastic strands or bands are spaced circumferentially about the bag mouth so that in their unstretched state, the bag mouth is smaller than the receptacle opening and in the stretched state, the bag mouth is larger than the receptacle opening.  
         [0015]     The securing system of the present invention may be easily incorporated into existing bags with or without integral closure systems. For traditional trash bags with no integral closure system, the elastic strands or bands previously described may be placed immediately adjacent the bag mouth, in which case a separate bag tie would have to be used at a gathering point somewhere below the strands. In one exemplary embodiment, the elastic strands or bands may be hidden by forming a hem along the mouth of the bag by folding the top edge over the bag for a distance to cover the strands or bands and sealing the edge of the hem to the bag body. The elastic strands or bands are fully enclosed within the hem. Alternatively, the elastic strands or bands may be placed some distance away from the mouth end to provide a length of bag material sufficient to tie a knot or otherwise provide a gathering point somewhere above the strands or bands that would be secured using a separate bag tie.  
         [0016]     The securing system of the present invention may also be easily incorporated into trash bags with integral closure systems. For trash bags that shape or contour the bag in order to provide integral tie ends extending above the bag mouth, the elastic strands or bands previously described may be placed adjacent the bag mouth. When the bag is full, the mouth is stretched and removed from the receptacle and the integral tie ends are used to secure the bag contents. For cinch-type closure systems, the elastic strands or bands may be placed within the hem, below the hem, or on the drawtape itself. In this way, the strands or bands effectively secure the bag to the receptacle while the cinch effectively closes the bag and may further provide a handle for which to carry the bag. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0017]     The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with a general description of the invention given above, and the detailed description of the embodiments given below, serve to explain the principles of the invention.  
         [0018]      FIG. 1  is a side elevational view of an elastic trash bag with elastic strand segments adhered along their entire lengths to the trash bag proximate the bag mouth in accordance with the principles of the present invention.  
         [0019]      FIG. 2  is a perspective view of an elastic trash bag with elastic strand segments adhered intermittently along their lengths to the trash bag proximate the bag mouth in accordance with the principles of the present invention and shown securely mounted to a trash receptacle.  
         [0020]      FIG. 3A  is a side elevational view of an elastic trash bag of the present invention wherein the elastic strands are elongated to encircle the entire mouth of the bag to form multiple elastic rings.  
         [0021]      FIG. 3B  is a side elevational view of an elastic trash bag of the present invention wherein each elastic ring that encircles the bag mouth comprises a pair of elastic strand segments attached to the bag to form the rings.  
         [0022]      FIG. 3C  is a side elevational view of an elastic trash bag of the present invention having multiple ring sets that encircle the entire mouth of the bag.  
         [0023]      FIG. 4A  is a side elevational view of an elastic trash bag of the present invention having a pair of elastic strand segments attached to the bag proximate the bag mouth.  
         [0024]      FIG. 4B  is a side elevational view of an elastic trash bag of the present invention having multiple elastic strand segments spaced circumferentially about the bag mouth.  
         [0025]      FIG. 5A  is a side elevational view of an elastic trash bag of the present invention wherein a bag tie closes the bag below elastic strands which encircle the bag mouth.  
         [0026]      FIG. 5B  is a side elevational view of an elastic trash bag of the present invention having a hem formed about the mouth of the bag and elastic strands located within the hem.  
         [0027]      FIG. 6  is a side elevational view of an elastic trash bag of the present invention wherein elastic strands are spaced a distance from the bag mouth.  
         [0028]      FIG. 7  is a side elevational view of an elastic trash bag of the present invention incorporating integral tie ends extending above the bag mouth that are used to close the bag.  
         [0029]      FIG. 8A  is a side elevational view of an elastic trash bag of the present invention incorporating a drawtape closure system within a hem, wherein elastic strand segments are located below the hem.  
         [0030]      FIG. 8B  is a perspective view of an elastic trash bag of the present invention with the bag removed from the trash receptacle and closed using a drawtape, wherein elastic strands encircle the entire mouth of the bag to form multiple elastic rings.  
         [0031]      FIG. 8C  is a side elevational view of an elastic trash bag of the present invention wherein the elastic strands encircle the mouth of the bag to form elastic rings as in  FIG. 3A .  
         [0032]      FIG. 8D  is a side elevational view of an elastic trash bag of the present invention wherein the elastic ring comprises a pair of elastic strand segments that encircle the entire mouth of the bag as in  FIG. 3B .  
         [0033]      FIG. 8E  is a side elevational view of an elastic trash bag of the present invention having multiple ring sets that encircle the entire mouth of the bag as in  FIG. 3C .  
         [0034]      FIG. 8F  is a side elevational view of an elastic trash bag of the present invention having multiple elastic strand segments spaced circumferentially about the bag mouth as in  FIG. 4B .  
         [0035]      FIG. 9  is a side elevational view of an elastic trash bag of the present invention wherein a double hem is formed, the first hem containing a drawtape and the second hem containing elastic strand segments.  
         [0036]      FIG. 10  is a side view of an elastic trash bag of the present invention wherein a drawtape and elastic strand segments are contained inside a single hem.  
         [0037]      FIG. 11  is a side view of an elastic trash bag of the present invention wherein elastic strand segments are attached to a drawtape located within a single hem. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0038]     Referring to  FIG. 1 , an elastic trash bag  10  is schematically illustrated in accordance with one embodiment of the present invention and comprises a trash bag body having two panels of plastic  12  and  14  ( FIG. 2 ) that are sealed along two vertical sides  16  and along the bottom side  18  of the two panels  12  and  14 . The top side of the panels  12  and  14  is not sealed and thereby provides an opening or mouth  20  for access into the interior of the bag. It will be appreciated that other formations of the trash bag  10  known to those skilled in the art are possible as well.  
         [0039]     In one embodiment of the present invention, multiple elastic strand segments  22  are adhesively attached to the trash bag  10  and extend generally parallel to the bag mouth  20  and are positioned relatively close to the bag mouth. The elastic strands  22  are attached to at least one of the plastic panels  12  and  14  while the strands  22  are stretched or elongated. In accordance with one embodiment, the adhesive may be applied to the strands  22  in a continuous manner along the entire length of the strands  22  as shown in  FIG. 1  so that the elastic strands  22  are adhered to the bag  10  along their entire lengths. Alternatively, the strands  22  may be adhered to the bag  10  at discrete spaced locations along the length of the strands  22  as shown in  FIG. 2 . When the strands  22  return to their unstretched state (see  FIG. 2 ), the bag panels  12  and  14  gather along the strands  22  thereby providing a stretchable region  24  along the mouth of the bag  20 .  
         [0040]     The strands  22  may comprise elastic strands of LYCRA XAJ Spandex, a synthetic stranded product manufactured by DuPont, or any other stranded elastic products such as threaded natural rubber by way of example. It will be appreciated by those of ordinary skill in the art that strands  22  may be replaced with one or more generally flat bands (not shown) without departing from the spirit and scope of the present invention. The strands  22  can be adhesively attached to the bag  10  in a number of different manners such as, by way of example, applying the adhesive as a spray, a continuous band, a continuous swirl spray, a non-looping swirl spray in the shape of an omega or sinusoid or as multiple adhesive dots as known by those skilled in the art. Examples of several of these adhesive dispensing patterns are fully disclosed in U.S. Pat. No. 6,435,425, entitled Module and Nozzle for Dispensing Controlled Patterns of Liquid Material, U.S. Pat. No. 6,582,518, entitled Guide System for Positioning an Elongated Strand In a Liquid Dispensing Environment, and co-pending U.S. Ser. No. 10/021,176, entitled Method and Apparatus for Use in Coating Elongated Bands, each disclosure of which is hereby incorporated herein by reference in its entirety.  
         [0041]     Referring to  FIG. 2 , the trash bag  10  is inserted as an interior liner of a formed container or receptacle  26  having an opening  28 . The trash bag  10  and attached elastic strands  22  are configured so that when the elastic strands  22  are unstretched, the bag mouth  20  is smaller than the receptacle opening  28 . But when the strands  22  are stretched, the bag mouth is larger than the receptacle opening  28 . Thus, to secure the bag  10  to receptacle  26 , the consumer inserts a bag into the receptacle opening  28 , stretches the bag mouth  20  to be larger than opening  28  and places the bag mouth  20  over opening  28 . When the consumer releases the bag mouth  20 , the elastic strands  22  retract and create a restoring force along the bag mouth  20  that secures the bag to the receptacle.  
         [0042]     The elastic strands  22  may be placed generally parallel to the mouth of the bag  10  in several different configurations.  FIGS. 3A-3C  illustrate several strand configurations according to the principles of the present invention.  FIG. 3A  shows one embodiment wherein the elastic strands  22  completely encircle the bag mouth  20 . This type of configuration might be accomplished by using a single strand  22  or multiple strands  22  (three (3) shown) that are either continuously or intermittently adhered to the panels  12  and  14  to form a single ring set  30  which encircles the bag mouth  20 .  
         [0043]     In another embodiment as shown in  FIG. 3B , each ring in set  30  may be composed of two discrete strand segments  22   a  and  22   b  that abut each other end-to-end to form a complete ring.  FIG. 3C  shows another embodiment of the present invention wherein multiple ring sets  30   a  and  30   b  may be formed to secure the bag  10  to the receptacle  26 . Multiple ring sets  30   a  and  30   b  might be appropriate when the bag  10  must hold a significant amount of weight or perhaps the bag is not supported along the bottom.  
         [0044]      FIGS. 4A-4B  show additional embodiments of strand configurations.  FIG. 4A  shows one embodiment of the present invention wherein a pair of discrete segments of elastic strands  22  (one shown) are adhered along their entire respective lengths to the bag  10  and extend proximate the mouth end  20  for respective lengths less than the width of either bag panel  12  or  14 . Alternatively, the discrete segments of elastic strands  22  may be adhered to the bag  10  at intermittent locations as shown in  FIG. 2 . The minimum length for strands  22  in this configuration is a length such that when the stretchable region  24 , defined by strands  22 , is fully expanded, the bag mouth  20  is just slightly larger than the receptacle opening  28  thus allowing the bag mouth  20  to be placed over the receptacle opening  28 . This configuration is advantageous in that it minimizes the amount of elastic material used to secure the bag  10  to the receptacle  26 .  
         [0045]      FIG. 4B  shows another embodiment of the present invention wherein multiple discrete strand segments  22   a ,  22   b , and  22   c  are spaced circumferentially about the bag mouth  20  to provide multiple points along the receptacle opening  28  where the bag  10  is secured to receptacle  26 . The strand segments  22   a ,  22   b  and  22   c  may each have equal lengths and may be uniformly spaced about the mouth end  20 , although other configurations are possible as well. The strand segments  22   a ,  22   b  and  22   c  may be adhered to the bag  10  along their entire respective lengths or at intermittent locations. The lengths for the bands  22   a ,  22   b  and  22   c  for this configuration are provided such that when all the stretchable regions  24   a ,  24   b , and  24   c  are fully expanded, the bag mouth  20  is just slightly larger than the receptacle opening  28  thus allowing the bag mouth  20  to be placed over receptacle opening  28 .  
         [0046]     The securing system of the present invention is adaptable to not only traditional trash bags but also to bags having integral closure systems.  FIG. 5A  shows one embodiment of the present invention adapted to a traditional trash bag.  FIG. 5A  shows elastic strand segments  22   a  and  22   b  placed immediately adjacent the bag mouth  20 . The strand segments  22   a  and  22   b  are adhered to the bag  10  end-to-end to form complete rings. When the bag is full, the bag is gathered together at a point below the strands  22   a ,  22   b  and a separate bag tie  32  is used to prevent the bag from reopening. Preferably, the strand segments  22   a  and  22   b  are hidden from view by forming a hem  34  along bag mouth  20  and placing the strands internal to the hem as shown in  FIG. 5B .  
         [0047]      FIG. 6  shows an alternate embodiment for traditional trash bags wherein the elastic strands  22  are located some distance away from bag mouth  20  to provide a length of bag material  36  sufficient to tie a knot or provide a gathering point above the bands that could be secured using a separate bag tie  32 .  
         [0048]     The securing system of the present invention may also be easily incorporated into trash bags with integral closure systems.  FIG. 7  illustrates one embodiment of a securing system used in conjunction with a trash bag that is shaped or contoured in order to provide integral tie ends  38  and  40  extending above bag mouth  20 . Elastic strands  22  may be placed proximate the bag mouth  20 . When the bag is full, the integral tie ends  38  and  40  are used to tie a knot to prevent the bag from reopening.  
         [0049]      FIGS. 8A-8F  further illustrate embodiments of the present invention used in cinch-type closure systems. Cinch-type closure systems have a drawtape/drawstring  42  internal to a bag hem  34  that encircles the bag mouth  20 . Elastic strands  22  may be placed below the hem  34  as shown in  FIG. 8A . The strands  22  secure the bag  10  to the receptacle  26  and when the bag is full, the drawtape/drawstring  42  is used to secure the bag contents and provide a handle to carry the bag, as shown in  FIG. 8B . As discussed previously, the elastic members  22  may completely encircle the bag mouth  20  to form a single ring set ( FIG. 8C ) or the ring set  30  may be composed of two discrete strand segments  22   a  and  22   b  that abut each other end-to-end for form a complete ring ( FIG. 8D ). As shown in  FIG. 8E , multiple ring sets  30   a  and  30   b  may be formed along the mouth of the bag. Additionally, as shown in  FIG. 8F , multiple discrete strand segments  22   a ,  22   b , and  22   c  may be spaced circumferentially about the bag mouth  20 .  
         [0050]      FIG. 9  shows an alternate embodiment for cinch-type closure systems wherein trash bag  10  has two hems  34   a  and  34   b , with the top hem  34   a  preferably containing the drawtape/drawstring  42  and the bottom hem  34   b  preferably containing elastic strands  22 .  FIG. 10  shows another embodiment wherein the elastic strands  22  and the drawtape/drawstring  42  are contained in a single hem  34 .  
         [0051]      FIG. 11  shows yet another embodiment for a cinch-type closure system wherein the elastic strands  22  are attached to the drawtape  42  and enclosed in the hem  34 . The drawtape  42  is generally flat, i.e. ungathered, so that the strands  22  lie generally parallel with the drawtape  42 . In this design, the elastic cinch secures the bag mouth  20  to the receptacle  26  and further provides for closure of the bag and a handle for which to carry the bag.  
         [0052]     Those of ordinary skill in the art will recognize the many other configurations of strands  22  and bands (not shown) that will effectively secure the bag  10  to the receptacle  26  without departing from the spirit and scope of the present invention.  
         [0053]     While the present invention has been illustrated by a description of various embodiments and while these embodiments have been described in considerable detail, it is not the intention of the applicant to restrict or in any way limit the scope of the appended claims to such detail. Additional advantages and modifications will readily appear to those skilled in the art. The invention in its broader aspects is therefore not limited to the specific details, representative apparatus and method, and illustrative example shown and described. Accordingly, departures may be made from such details without departing from the spirit or scope of applicant&#39;s general inventive concept.  
         [0054]     Having described the invention, what is claimed is: