Elastic trash bag and method of making the same
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.
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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 INVENTIONThis 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 INVENTIONTrash 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.
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.
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.
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.
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.
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.
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.
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.
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 INVENTIONThe 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.
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.
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.
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.
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 DRAWINGSThe 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.
Referring to
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
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.
Referring to
The elastic strands 22 may be placed generally parallel to the mouth of the bag 10 in several different configurations.
In another embodiment as shown in
The securing system of the present invention is adaptable to not only traditional trash bags but also to bags having integral closure systems.
The securing system of the present invention may also be easily incorporated into trash bags with integral closure systems.
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.
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's general inventive concept.
Having described the invention, what is claimed is:
Claims
1. A trash bag for a receptacle having an opening to receive the bag, the trash bag comprising:
- a trash bag body having an open bag mouth;
- a hem formed proximate said bag mouth and having at least one opening in said hem;
- a drawtape contained within said hem, said drawtape being accessible at the opening of said hem opening to allow said drawtape to be pulled therethrough relative to said trash bag body so as to close said bag mouth; and
- at least one elongated elastic member adhesively attached directly to a generally flat surface of said drawtape so that essentially the entire length of said elastic member is attached to said drawtape, said elastic member having an unstretched state and a stretched state, said elastic member being adhesively attached to said generally flat surface of said drawtape while in the stretched state.
2. The trash bag of claim 1, wherein said elastic member comprises at least one elongated elastic strand.
3. The trash bag of claim 1, wherein said elastic member comprises at least one elongated elastic band.
4. The trash bag of claim 1, wherein said elastic member is disposed generally parallel to said drawtape along the entire length of said elastic member.
5. The trash bag of claim 1, wherein the adhesive is applied to said at least one elongated elastic member in a manner selected from the group consisting of a spray, a continuous band, a continuous swirl, an omega swirl, a sinusoidal swirl and multiple dots.
6. A method of making a trash bag for a receptacle having an opening to receive the bag, the method comprising:
- providing a trash bag body having an open bag mouth;
- stretching an elongated elastic member;
- applying an adhesive to the elongated elastic member; and
- attaching the elongated elastic member directly to a surface of the trash bag body proximate the bag mouth with the adhesive while the elastic member is in a stretched state, the elastic member forming a stretchable region in the trash bag body when released to an unstretched state.
7. The method of claim 6 wherein the elastic member comprises one of an elastic strand and an elastic band.
8. The method of claim 6 further comprising the step of applying the adhesive in a manner selected from the group consisting of a spray, a continuous band, a continuous swirl, an omega swirl, a sinusoidal swirl and multiple dots.
9. The method of claim 6 further comprising the step of applying the adhesive in a continuous manner so as to adhere the elastic member to the trash bag body essentially along the entire length of the elastic member.
10. The method of claim 6 further comprising the step of applying the adhesive in a discrete manner so as to adhere the elastic member to the trash bag body at spaced apart locations along the length of the elastic member.
11. The method of claim 6 further comprising the step of attaching the elastic member to the trash bag body to form a ring that encircles the bag mouth.
12. A method of making a trash bag for a receptacle having an opening to receive the bag, the method comprising:
- providing a trash bag body having an open bag mouth, a hem formed proximate the bag mouth having at least one opening, and one of a drawtape and a drawstring contained within the hem;
- stretching an elongated elastic member;
- applying an adhesive to the elongated elastic member; and
- attaching the elongated elastic member directly to a surface of the trash bag body proximate the bag mouth with the adhesive while the elastic member is in the stretched state, the elastic member forming a stretchable region in the trash bag body when released to an unstretched state.
13. The method of claim 12 wherein the elastic member comprises one of an elastic strand and an elastic band.
14. The method of claim 12 further comprising the step of applying the adhesive in a manner selected from the group consisting of a spray, a continuous band, a continuous swirl, an omega swirl, a sinusoidal swirl and multiple dots.
15. The method of claim 12 further comprising the step of applying the adhesive in a continuous manner so as to adhere the elastic member to the trash bag body essentially along the entire length of the elastic member.
16. The method of claim 12 further comprising the step of applying the adhesive in a discrete manner so as to adhere the elastic member to the trash bag body at spaced apart locations along the length of the elastic member.
17. The method of claim 12 further comprising the step of attaching the elastic member to the trash bag body so as to be within the hem.
18. The method of claim 12 wherein the hem includes two channels, the one of the drawtape and drawstring positioned within one of the channels and the elastic member attached to the trash bag body within the other channel.
19. A method of making a trash bag for a receptacle having an opening to receive the bag, the method comprising:
- providing a trash bag body having an open bag mouth, a hem formed proximate the bag mouth having at least one opening, and a drawtape contained within the hem;
- stretching an elongated elastic member;
- applying an adhesive to the elongated elastic member; and
- attaching the elongated elastic member directly to a generally flat surface of the drawtape with the adhesive while the elastic member is in the stretched state, the elastic member forming a stretchable region in the drawtape when released to an unstretched state.
20. The method of claim 19 wherein the elastic member comprises one of an elastic strand and an elastic band.
21. The method of claim 19 further comprising the step of applying the adhesive in a manner selected from the group consisting of a spray, a continuous band, a continuous swirl, an omega swirl, a sinusoidal swirl and multiple dots.
22. The method of claim 19 further comprising the step of applying the adhesive in a continuous manner so as to adhere the elastic member to the drawtape essentially along the entire length of the elastic member.
23. The method of claim 19 further comprising the step of applying the adhesive in a discrete manner so as to adhere the elastic member to the drawtape at spaced apart locations along the length of the elastic member.
Type: Application
Filed: May 13, 2005
Publication Date: Sep 22, 2005
Applicant: Nordson Corporation (Westlake, OH)
Inventor: John Raterman (Atlanta, GA)
Application Number: 11/128,702