US20160114939A1 - Draw tape bag - Google Patents
Draw tape bag Download PDFInfo
- Publication number
- US20160114939A1 US20160114939A1 US14/965,624 US201514965624A US2016114939A1 US 20160114939 A1 US20160114939 A1 US 20160114939A1 US 201514965624 A US201514965624 A US 201514965624A US 2016114939 A1 US2016114939 A1 US 2016114939A1
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- US
- United States
- Prior art keywords
- drawstring
- draw tape
- tape film
- stretched
- stretched draw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/16—End- or aperture-closing arrangements or devices
- B65D33/28—Strings or strip-like closures, i.e. draw closures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/004—Closing bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B70/813—Applying closures
- B31B70/8134—Applying strings; Making string-closed bags
- B31B70/8136—Applying strings; Making string-closed bags the strings being applied in the cross direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B70/813—Applying closures
- B31B70/8134—Applying strings; Making string-closed bags
- B31B70/8137—Applying strings; Making string-closed bags the ends of the strings being attached to the side edges of the bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/001—Flexible containers made from webs by folding webs longitudinally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/001—Flexible containers made from webs by folding webs longitudinally
- B31B2155/0014—Flexible containers made from webs by folding webs longitudinally having their openings facing transversally to the direction of movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B70/16—Cutting webs
- B31B70/18—Cutting webs longitudinally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/74—Auxiliary operations
- B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
- B31B70/813—Applying closures
Abstract
The bag may include a draw tape that may be used to cinch closed the opening of the bag. The draw tape has at least one stretched elastomeric strip attached to the draw tape in an extended condition. The draw tape may be smaller in size than the bag sidewalls. The draw tape may include an elastic characteristic, such as patterned ribs. In one embodiment, the roll of bag is kept under tension to maintain the elastomeric strips in a stretched condition.
Description
- This application is a Continuation and claims the benefit of U.S. application Ser. No. 12/471,727, filed Aug. 17, 2009, which is hereby incorporated by reference in their entirety.
- 1. Field of the Invention
- This invention relates generally to bags having a draw tape. More particularly, the present invention relates generally to trash bags having a draw tape.
- 2. Description of the Related Art
- Among their many applications, it is known to use thermoplastic bags as liners in trash or refuse receptacles. Trash receptacles that employ such liners may be found at many locations, such as, from small household waste baskets and kitchen garbage cans. The trash canisters are typically made from a rigid material such as metal or plastic. Bags that are intended to be used as liners for such refuse containers are typically made from low-cost, pliable thermoplastic material. When the receptacle is full, the thermoplastic liner actually holding the trash can be removed for further disposal and replaced with a new liner. To avoid inadvertently spilling the contents during disposal, the bags may be provided with a draw tape that allows for constricting or closing the open circumference of the bag. The draw tape may also be tied into a knot to simplify handling of the bag during disposal.
- When being utilized as a trash canister liner, it is important that the bag be easily secured into the canister and as the full bag is removed that the open top part of the bag can be easily closed over the contents. U.S. Pat. No. 6,939,042 to Rusnak et al. discloses a plastic bag with a live elastic strip that contracts to restrict the opening.
- Another potential difficulty is securing the bag to a canister which is larger than the bag mouth opening. If the canister is larger than the bag mouth opening, then the user cannot fold the bag over the rim of the canister. U.S. Pat. No. 6,059,458 to Belias et al. describes a drawtape bag where the drawtape section is gathered into one or more loops defining a series of crests and troughs, and each trough is sealed to the elastomeric strip. The elastomeric strip allows the mouth of the bag to be drawn over the upper portion of a trash container.
- However, consumers still may have trouble inserting stretchy top bags into trash containers. Therefore, it is desirable to develop a simpler and quicker method of inserting and securing trash bag liners to trash canisters. It is also desirable to implement the inserting and securing method in such a manner that it is inexpensive and may be facilitated in a high speed manufacturing environment.
- In accordance with the principles of the present invention, in one embodiment, a draw tape bag comprises a first sidewall; a second sidewall, the second sidewall joined to the first sidewall by a closed bottom end, a first edge, and a second edge, thereby defining an open top end having a top surface with a top length; at least one of the sidewalls forming a hem having a top length and extending along the open top end disposed opposite the bottom end having a bottom length, the hem including one or more draw tape notches; a pliable thermoplastic draw tape in an extended state housed within the hem; a strip of elastic material having a fully relaxed length and a stretched expanded length, the elastic strip attached in the stretched expanded length condition to at least a first discrete region and a second discrete region of the extended draw tape, such that the hem is gathered together when the stretched elastic material attached to the draw tape is allowed to relax.
- In an embodiment, a roll of draw tape bags comprises a plurality of bags, each bag including a first sidewall, a second sidewall joined to the first sidewall so as to define a closed bottom end, a first edge, a second edge, and an open top end; the plurality of bags arranged to define a length with the first sealed edge of at least one bag joined to the second sealed edge of an adjacent bag; at least one of the sidewalls forming a hem extending along the open top end disposed opposite the bottom end, the hem including one or more draw tape notches; a pliable thermoplastic draw tape in an extended state housed within the hem; a strip of elastic material having a relaxed condition and a stretched condition, the elastic strip stretched lengthwise under tension to an expanded stretched length; a first discrete region and a second discrete region along the length of the elastic strip attached in the stretched expanded length condition to a first discrete region and a second discrete region of the draw tape in the extended state; wherein the length of the plurality of bags is rolled together about an axis normal to the first and second edges of the bags to form a roll, the roll being perforated and continuous or interleaved, whereby the roll can prevent some attached elastic strips from returning to the relaxed condition or eliminate a bag folding step.
- In one embodiment, the draw tape bag comprises a pair of pliable thermoplastic body panels joined to each other along a pair of opposing sides and a bottom bridging the opposing sides, at least one of the body panels forming a hem extending along a mouth end disposed opposite the bottom, the hem including one or more draw tape notches; a pliable thermoplastic draw tape in an extended state housed within the hem, the draw tape being partially exposed by the respective draw tape notches which allow the draw tape to be pulled therethrough to close the bag and to be used as a handle; and a stretched elastomeric strip having a first end and a second end wherein the first and second ends are connected to a first portion and a second portion respectively of an extended section of the draw tape.
- In one embodiment, the method of manufacturing draw tape bags, comprising forming a flattened thermoplastic tube in a machine direction; dividing the thermoplastic tube into first and second portions along a dividing line extending in the machine direction, each of the portions including a pair of pliable thermoplastic sheets joined to each other along a bottom disposed in the machine direction, the sheets being separable from each other along a mouth end formed opposite the bottom; forming a hem on at least one of the sheets along the mouth end; forming draw tape notches in the hem at regular distance intervals corresponding to a desired width of the draw tape bags; inserting a pliable thermoplastic, extended draw tape into the hem, a stretched elastomeric strip having a first end and a second end, the first and second ends being connected to a first section and a second section of the draw tape respectively; and sealing the sheets to each other along side seal structures generally transverse to the machine direction to create individual draw tape bags.
- The thermoplastic bag may be produced in a high speed manufacturing process that develops continuous sheet-like webs of thermoplastic material into the finished bag via automated equipment. The process may form hems along an edge of the advancing web for accommodating the draw tape. The process may provide a strip of tape material in a relaxed or pre-stretched condition, insert the strip into the hem, and form the side seals in the relaxed or pre-stretched condition. The process may provide a strip or strips of elastic material in a stretched state that is attached to the tape material and/or the hem. The stretched elastic material may be relaxed after or during the manufacture of the rest of the bag.
- An advantage is that the elastic characteristic added to the hem or the draw tape enables the bag opening to gather to a relaxed state to allow the bag to have easier insertion into a trash container and to better secure itself to the container and may resist falling into the container. Another advantage of the thermoplastic bag is that it includes a draw tape that may be used to constrict the opening and reduce spillage of any contents. Another advantage is that the user may be able to stretch the bag opening to secure the bag to a canister which is larger than the bag mouth opening. A further possible advantage is that the thermoplastic bag may be produced by a high speed, low cost manufacturing process. These and other advantages and features of the thermoplastic bag will become apparent from the following description and accompanying drawings.
- The foregoing aspects and others will be readily appreciated by the skilled artisan from the following description of illustrative embodiments when read in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a perspective view of a thermoplastic bag having a draw tape in a contracted state that partially constricts the bag opening. -
FIG. 2 is a cross-sectional view of the thermoplastic bag taken along line 3-3 ofFIG. 1 and illustrating a draw tape accommodated in a hem. -
FIG. 3 is a partial cut away view of the thermoplastic bag showing the draw tape attached to the bag. -
FIG. 4 is a partial cut away view of the thermoplastic bag showing the draw tape material having two stretched elastic strips and attached to the bag. -
FIG. 5 is a partial cut away view of the thermoplastic bag showing the draw tape material having a stretched elastic strip and attached to the bag. -
FIG. 6 is a partial cut away view of the thermoplastic bag ofFIG. 4 showing the draw tape and elastic strips in the relaxed condition attached to the bag. -
FIG. 7 is a perspective view of a thermoplastic bag having a draw tape in an extended state. -
FIG. 8 is a partial cut away view of another embodiment of the bag having end cutout notches and the draw tape material having an attached stretched elastic strip. -
FIG. 9 is a partial cut away view of another embodiment of the bag having end cutout notches and the draw tape material having an attached stretched elastic strip. -
FIG. 10 is a partial cut away view the bag ofFIG. 9 with the elastic strips in a relaxed condition. -
FIG. 11 is cross-sectional view of an embodiment of the elastic strip. -
FIG. 12 is a partial cut away view of an embodiment of the bag having a patterned draw tape. -
FIG. 13 is an illustration of an embodiment of a manufacturing process of the invention. -
FIG. 14 is a perspective view of a roll of bags of the invention. - Reference will now be made to the drawings wherein like numerals refer to like parts throughout. For ease of description, the components of this invention are described in the normal (upright) operating position, and terms such as upper, lower, horizontal, top, bottom, etc., are used with reference to this position. It will be understood, however, that the components embodying this invention may be manufactured, stored, transported, used, and sold in an orientation other than the position described.
- Figures illustrating the components of this invention show some conventional mechanical elements that are known and that will be recognized by one skilled in the art. The detailed descriptions of such elements are not necessary to an understanding of the invention, and accordingly, are herein presented only to the degree necessary to facilitate an understanding of the novel features of the present invention.
- All publications, patents and patent applications cited herein, whether supra or infra, are hereby incorporated by reference in their entirety to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated by reference.
- As used herein and in the claims, the term “comprising” is inclusive or open-ended and does not exclude additional unrecited elements, compositional components, or method steps. Accordingly, the term “comprising” encompasses the more restrictive terms “consisting essentially of” and “consisting of”.
- The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
- Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although a number of methods and materials similar or equivalent to those described herein can be used in the practice of the present invention, the preferred materials and methods are described herein.
- Referring to
FIG. 1 , there is illustrated athermoplastic bag 100 of the kind useful as a liner for trash receptacles and refuse containers. Of course, the illustrated bag may have additional or different uses. Thebag 100 may be made from afirst sidewall 102 and opposingsecond sidewall 104 overlaid and joined to the first sidewall to define aninterior volume 106 for holding trash. The first and second sidewalls may have matching rectangular or square shapes and may be joined along afirst side edge 110, asecond side edge 112 that may be parallel to and spaced apart from the first side edge, and a closedbottom edge 114 that extends between the first and second side edges. Thesidewalls - The first and
second sidewalls - To access the
interior volume 106, thetop edges 120, 122 of the first and second sidewalls between the first and second side edges and which are located opposite thebottom edge 114 may remain un-joined to provide the periphery of anopening 124. When thebag 100 is placed in a trash receptacle, thetop edges 120, 122 corresponding to theopening 124 are typically folded back over the rim to help retain the bag in a vertical position within the receptacle. - To close the
opening 124 of thebag 100 when, for example, disposing of the trash receptacle liner, the bag may be fitted with adraw tape 130. To accommodate thedraw tape 130, referring toFIG. 2 , thetop edges 120, 122 of the first andsecond sidewalls opening 124 may include respective first and second hem flaps 140, 142. Thefirst hem flap 140 may be folded back into theinterior volume 106 and attached to the interior surface of thefirst sidewall 102 to form afirst hem 144. Similarly, thesecond hem flap 142 of thesecond sidewall 104 is similarly folded back into theinterior volume 106 and attached to the second sidewall to form a second hem 146. The hem flaps may be attached to the interior surfaces of the sidewalls by adhesive, heat seals or otherwise. In other embodiments, the hems may be formed by folding the hem flaps toward the exterior of the sidewalls and attaching them to the sidewall exterior surface, or the hems may be formed as separate elements that are attached to the sidewalls. To access thedraw tape 130, as illustrated inFIG. 1 , first andsecond notches top edges 120, 122. Pulling thedraw tape 130 through thenotches top edges 120, 122 thereby drawing closed theopening 124. - Referring to
FIGS. 2 and 3 , thedraw tape 130 may be formed as an elongated strip of thermoplastic material. When inserted into thehems 144, 146, the draw tape first and second ends 131, 132 may be attached to the first andsecond sidewalls second hems 144, 146 proximately along the first and secondtop edges 120, 122. In those embodiments in which the bag is heat sealed together, the draw tape first and second ends 131, 132 may be heat sealed to and in-between the first andsecond sidewalls second edges elastic strip 150 may be attached to the fullyextended draw tape 130 at the opposite first and second ends 131, 132 and atintermediate points 134, 135 in between. Theextended draw tape 130 haslength 161 between opposite first and second ends 131, 132 which are spaced apart by an intermediate section 133. The extendeddraw tape length 161 is equal to thebottom length 160. Referring toFIG. 4 showing two stretched elastic strips, one length of expanded stretchedelastic strip 151 is attached tofirst end 131 andintermediate point 136 and another length of expanded stretchedelastic strip 152 is attached to thedraw tape 130second end 132 andintermediate point 137. Theextended draw tape 130 with the stretchedelastic strips length 161 equal to thebottom length 160. In other embodiments, the extended draw tape has a length longer than the bottom length. Referring toFIG. 5 , one length of expanded stretchedelastic strip 153 is attached to thedraw tape 130 atintermediate point 138 and atintermediate point 139. Theextended draw tape 130 with the stretchedelastic strip 153 haslength 161 equal to thebottom length 160. Theelastic strip 153 is not attached to thehem 144, 146. Theelastic strip 153 is not attached to the sidewall.FIG. 6 shows that when thedraw tape 130 with the attachedelastic strips bag 100 ofFIG. 4 is allowed to relax, so that theelastic strips bag 100 and thehems 144, 146 gather so that the relaxedtop length 162 is shorter than thebottom length 160. - In another embodiment, only the draw tape ends 131, 132 may be attached together to form a closed loop that is freely accommodated in the hems, such as, the bag shown in
FIG. 7 . Thedraw tape 130 may be accessed through the first andsecond end notches 149. Pulling thedraw tape 130 through thenotches 149 constricts thetop edges 120, 122 thereby drawing closed theopening 124. One length of expanded stretchedelastic strip 151 is attached tofirst end 131 andintermediate point 136 and another length of expanded stretchedelastic strip 152 is attached to thedraw tape 130second end 132 andintermediate point 137. Theextended draw tape 130 with the expanded stretchedelastic strips length 161 equal to thebottom length 160. Referring toFIG. 8 , an expanded stretchedelastic strip 150 may be attached to theextended draw tape 130 at the opposite first and second ends 131, 132 and atintermediate points 134, 135 in between. Theextended draw tape 130 with the stretchedelastic strip 150 haslength 161 equal to thebottom length 160. Referring toFIG. 9 , one length of expanded stretchedelastic strip 153 is attached to theextended draw tape 130 atintermediate point 138 and atintermediate point 139. Theextended draw tape 130 with the expanded stretchedelastic strip 153 haslength 161 equal to thebottom length 160.FIG. 10 shows that when thebag 100 ofFIG. 9 is allowed to relax, so that theelastic strip 153 is allowed to relax into the unstretched condition, thebag 100 gathers so that the relaxedtop length 162 is shorter than thebottom length 160. In all embodiments, the number of attached regions can be varied from 2, 3, 4, more than 4, or more than 10. - Attachment of the elastic strip to the draw tape can be achieved by adhesive, heat sealing, stitching, or other methods well known in the art. The elastic strip is illustrated in a prestretched expanded length condition where the strip is tensioned along the direction of the length of the draw tape. Placing the elastic strip in the stretched expanded length condition causes the
draw tape 130 to bunch together when the elastic strip contracts to the relaxed condition, thereby constricting theopening 106, causing thesidewall 102 and thetop edges 120, 122 to bunch together, and causing thebag 100 to assume a shined appearance, as inFIG. 1 . - Additionally, the
draw tape 130 may have an elastic quality that allows it to expand and contract along its length. When the contracteddraw tape 130 constricts the opening, the sidewall material at thetop edges 120, 122 and/or the hems may gather or shirr together to provide a pleat-like appearance, as inFIG. 1 . In one embodiment, thedraw tape 130 may be made from an elastic material. For example, the elastic material may be low density polyethylene, very low density polyethylene, linear low density polyethylene, ultra low density polyethylene, or ethylene vinyl acetate, and may be formed in combinations and in single or multiple layers. The draw tape may have elastic characteristics which allow the draw tape to stretch or extend when under tension and which allow the draw tape to relax or retract when not under tension. Referring theFIG. 3-5 , thedraw tape 130 may be attached at the first andsecond edges draw tape 130 is in an stretched state under tension. For example, the draw tape may be stretched from about 10% to about 30%, or from about 5% to about 50%, from its relaxed state. After the side seals are completed, thedraw tape 130 will relax or retract and the draw tape contracts and narrows the mouth of the bag as shown inFIG. 6 . Since the relaxed draw tape is shorter than the hem, the hem will gather and the gathered hem will make the “stretch to grip” feature of the draw tape apparent to the consumer. The shorter than normal draw tape also provides a potential reduction in the cost of material. - The elastic draw tape or strip can be made from any suitable material, such as, EVA (ethylene-vinyl acetate co-polymer), VLDPE (very low density polyethylene), linear low density polyethylene, Lycra® by DuPont, EPDM (ethylene propylene diene monomer rubber), and rubber, for example. In some embodiments, the elastic strip may be provided as a multi-layer structure as illustrated in
FIG. 11 . For example, theelastic strip 200 can be made of acore layer 201 disposed between twoskin layers elastic strip 200 to the draw tape while thecore 201 can provide the desired elastic properties, as describe in U.S. Pat. No. 6,939,042, which is hereby incorporated in its entirety by reference herein. - To provide the elastic characteristic, the
draw tape 130 may be stretched prior to insertion in the hem. Pre-stretching may modify the elastic quality, for instance to change from relatively non-elastic to relatively elastic, of the draw tape allowing expansion and contraction and may facilitate stretching of the draw tape by a consumer during insertion of the bag into a receptacle. Pre-stretching may be accomplished by placing the draw tape under tension such as by pulling the ends of the draw tape to stretch it along its length. After insertion into the hem and attachment to the bag, the stretched draw tape may then be allowed to recover, at least in part, towards its original length. Recovery of the stretched tape may partially constrict the opening in a similar fashion to the above described embodiments of the bag. Thus, the pre-stretched tape is easier to stretch and expand when attaching to a container. Another possible advantage of pre-stretching the draw tape is that the pre-stretched draw tape retains or increases its tensile strength per unit thickness in the direction of stretch. This enables a greater quantity of draw tapes to be made from a single roll of draw tape material resulting in cost savings of material. In other embodiments, the pre-stretched draw tape may also be imparted with a pattern to modify the elastic characteristics. - Referring to
FIG. 12 , the draw tape may be formed with a pattern. Formed intermittently along the length of thedraw tape strip 270 may bemultiple regions 271 ofpatterns 272. Thepatterns 272 may take the form of linearly arrangedribs 276 that may extend across the width of thestrip 270. Theribs 276 may be parallel and adjacent to one another and perpendicular to the length of thestrip 270 such that the thermoplastic material has a generally corrugated or wavy shape with the ribs bunched closely together. However, when a tensioning force is applied to thepattern 272 by, for example, pulling the strip in thedirection 278, theribs 276 may unfold thereby flattening the thermoplastic material out in a manner that causes the strip to expand in length. Additionally, the thermoplastic material of the strip may demonstrate shape memory or resiliency by which, when the tensioning force is released, theribs 276 reform or refold thereby causing thestrip 270 to contract. The pattern thereafter may regain its corrugated or wavy shape. Thus, as may be appreciated, thepattern 272 may provide the draw tape with an elastic quality. Patterns may also include decorative patterns, such as logos. Examples of such patterns and similar features are disclosed in U.S. Pat. No. 6,139,185; U.S. Publication No. 2004/0134923; U.S. Pat. No. 6,394,651; U.S. Pat. No. 6,394,652; U.S. Pat. No. 6,150,647; U.S. Pat. No. 6,513,975; and U.S. Pat. No. 6,695,476, each of which is herein incorporated by reference in its entirety and is set forth in its entirety herein. Thedraw tape 130 may include elastic characteristics as described herein, such as, the pre-stretched draw tape, the pre-stretched draw tape with a pattern, or the draw tape with a pattern and no pre-stretch. - Process
- Referring to
FIG. 13 , there is illustrated an embodiment of a manufacturing process for producing the above-described bag. The manufacturing process is carried out by automated machinery operating continuously at high speeds. First, athermoplastic tube 300 is extruded in a machine direction, flattened by rollers in aflattening mechanism 301, and then slit in half by astatic slitting mechanism 302 along acenter line 304. Each half 300 a and 300 b of thetube 300 includes a pair of pliable thermoplastic sheets joined to each other along a bottom 14 disposed in the machine direction. The machine direction is designated by an arrow labeled MD. The sheets are separable from each other along a mouth end proximate to center slitline 304 and opposite the bottom 14. - Second, the sheets are passed through a
static folding mechanism 306 in the machine direction (MD) to produce ahem 144, 146 on each sheet along the mouth end. Third, a single-hole cutting mechanism 308 createsdraw tape notches 149 in thehem 144, 146 on each sheet at regular distance intervals corresponding to a predetermined width of thedraw tape bags 100 produced by the manufacturing method. Thedraw tape notches 149 in thehem 144, 146 on one of the sheets coincide with the respective draw tape notches in the hem on the other of the sheets. - Fourth, in
mechanism 309, a pliablethermoplastic draw tape 130 from a supply roll (not shown) is continuously fed and inserted into thehem 144, 146 on each sheet. Thedrawtape 130 is extended corresponding to the predetermined width of thedraw tape bags 100 produced by the manufacturing method. Prior to insertion, stretchedelastomeric strips 151 are attached to the respective extended sections of thedraw tape 130 as described above in connection withFIGS. 7-9 , for example theintermediate seal 138, 139 (seeFIG. 9 ). Fifth, a staticheat sealing mechanism 310 generates a hem seal in the machine direction (MD) which attaches thehem 144, 146 on each sheet to the respective sheet. - Sixth, a
heat sealing mechanism 312 generates draw tape seals 131, 132 which attach thedraw tape 130 housed within thehem 144, 146 on the one of the sheets to the draw tape housed within the hem on the other of the sheets at the locations of the coincidingdraw tape notches 149. These draw tape seals 131, 132 are transverse to the machine direction (MD). Seventh, a heat sealing andperforation mechanism 313 generatesside seal structures draw tape bags 100 produced by the manufacturing method. Eachside seal structure draw tape bags 100. Thebags 100 may then be packaged in a dispensing box for sale to consumers. - In one embodiment, the sheets can be continuously wound into a
roll 400 by a winder. Prior to the winding operation, the sheets may pass through a V-folder assembly that folds the sheets into a smaller size. In the embodiment inFIG. 14 , in which thesheets 401 are wound into aroll 400, the tension of thesheets 401 is preferably maintained so that the draw tape and stretched elastic strips remain in at least a partially stretched condition. In the embodiments in which the finished bags are distributed on a roll with the perforations intact, the bags can be tightly wound to prevent some of the stretched elastic strips from fully contracting and returning to their relaxed condition. For example, referring toFIG. 14 , thesheets 401 and attacheddraw tape 130 with stretchedelastic strips axis 402 so that successive layers of the web and tape bury and hold the inner layers in at least a partially stretched condition. In some embodiments, to facilitate winding, a core may be provided at the winding operation around which the bag can be wound. Once the outermost bag is unwound from theroll 400 and detached along the perforation line, the tension is removed from the bag and the draw tape and elastic strip contracts to constrict the opening and gather the hem together. When the bags are detached along the perforation line, the bags can be interleaved in a stack, such as described in WO2007/146877 to Mack-Robles and U.S. Pat. No. 5,390,875 to Geitman, which are incorporated in their entirety herein. - Exemplary embodiments are described herein. Variations of those embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventor(s) expect skilled artisans to employ such variations as appropriate, and the inventor(s) intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
Claims (21)
1. A drawstring comprising:
a stretched draw tape film comprising a thermoplastic material, the stretched draw tape film being formed from an un-stretched draw tape film; and
an elastic characteristic provided by subjecting the un-stretched draw tape film to a stretching process;
wherein the elastic characteristic provides the stretched draw tape film with an elastic recovery that is greater than an elastic recovery of the un-stretched draw tape film; and
wherein the stretched draw tape film has a tensile strength greater than a tensile strength of the un-stretched draw tape film.
2. The drawstring of claim 1 , wherein the elastic characteristic allows the drawstring to expand and contract along a length of the drawstring.
3. The drawstring of claim 1 , wherein the stretched draw tape film has a tensile strength per square inch greater than a tensile strength per square inch of the un-stretched draw tape film.
4. The drawstring of claim 1 , wherein the thermoplastic material of the stretched draw tape comprises low-density polyethylene and linear low density polyethylene.
5. The drawstring of claim 1 , further comprising a first plurality of linearly arranged ribs.
6. The drawstring of claim 1 , wherein the ribs of the first plurality of linearly arranged ribs extend in a direction perpendicular to a length of the drawstring.
7. The drawstring of claim 6 , further comprising a second plurality of linearly arranged ribs that extend in the direction perpendicular to the length of the drawstring, the second plurality of linearly arranged ribs being separated a region of the drawstring lacking linearly arranged ribs.
8. The drawstring of claim 1 , wherein a width of the drawstring varies along a length of the drawstring.
9. The drawstring of claim 1 , wherein the drawstring comprises a plurality of layers.
10. The drawstring of claim 1 , wherein the drawstring further comprises an elastomeric strip attached to the stretched draw tape film.
11. The drawstring of claim 1 , wherein the drawstring is positioned with in a hem of a trash bag.
12. A thermoplastic drawstring comprising:
a stretched draw tape film formed from an un-stretched draw tape film; and
an elastic characteristic provided by subjecting the un-stretched draw tape film to the stretching process;
wherein the elastic characteristic provides the stretched draw tape film with an elastic recovery that is greater than an elastic recovery of the un-stretched draw tape film;
wherein the stretched draw tape film is elastic and the un-stretched draw tape film is non-elastic.
13. The thermoplastic drawstring of claim 12 , wherein the stretched draw tape film has a tensile strength greater than a tensile strength of the un-stretched draw tape film.
14. The thermoplastic drawstring of claim 12 , the drawstring comprises a core layer consisting of the stretched draw tape film and outer skin layers.
15. The thermoplastic drawstring of claim 14 , further comprising an elastomeric strip attached to one of the outer skin layers.
16. The thermoplastic drawstring of claim 13 , wherein the stretched draw tape film comprises low density polyethylene.
17. The thermoplastic drawstring of claim 12 , wherein the drawstring is positioned with in a hem of a trash bag.
18. The thermoplastic drawstring of claim 17 , wherein the drawstring is attached to sides of trash bag and unattached to the hem between the sides of the trash bag.
19. The thermoplastic drawstring of claim 18 , wherein a width of the trash bag along a top of trash bag is less than a width of the trash bag along a bottom when the stretched draw tape film is in the relaxed state.
20. The thermoplastic drawstring of claim 12 , further comprising a first plurality of linearly arranged ribs.
21. The drawstring of claim 12 , wherein the ribs of the first plurality of linearly arranged ribs extend in a direction perpendicular to a length of the drawstring.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/965,624 US20160114939A1 (en) | 2009-05-26 | 2015-12-10 | Draw tape bag |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/471,727 US10023361B2 (en) | 2009-05-26 | 2009-05-26 | Draw tape bag |
US14/965,624 US20160114939A1 (en) | 2009-05-26 | 2015-12-10 | Draw tape bag |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/471,727 Continuation US10023361B2 (en) | 2009-05-26 | 2009-05-26 | Draw tape bag |
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US20160114939A1 true US20160114939A1 (en) | 2016-04-28 |
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Application Number | Title | Priority Date | Filing Date |
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US12/471,727 Active US10023361B2 (en) | 2009-05-26 | 2009-05-26 | Draw tape bag |
US14/965,608 Active US9550610B2 (en) | 2009-05-26 | 2015-12-10 | Draw tape bag |
US14/965,624 Abandoned US20160114939A1 (en) | 2009-05-26 | 2015-12-10 | Draw tape bag |
US15/657,807 Active US10647476B2 (en) | 2009-05-26 | 2017-07-24 | Draw tape bag |
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US12/471,727 Active US10023361B2 (en) | 2009-05-26 | 2009-05-26 | Draw tape bag |
US14/965,608 Active US9550610B2 (en) | 2009-05-26 | 2015-12-10 | Draw tape bag |
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US15/657,807 Active US10647476B2 (en) | 2009-05-26 | 2017-07-24 | Draw tape bag |
Country Status (5)
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US (4) | US10023361B2 (en) |
CN (1) | CN102459016A (en) |
AU (1) | AU2010254446A1 (en) |
CA (1) | CA2762979A1 (en) |
WO (1) | WO2010138276A1 (en) |
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US9586726B1 (en) * | 2015-09-21 | 2017-03-07 | Poly-America, L.P. | Drawstring trash bag |
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Also Published As
Publication number | Publication date |
---|---|
US10647476B2 (en) | 2020-05-12 |
US20100303388A1 (en) | 2010-12-02 |
AU2010254446A1 (en) | 2011-12-15 |
CA2762979A1 (en) | 2010-12-02 |
US10023361B2 (en) | 2018-07-17 |
US20160096660A1 (en) | 2016-04-07 |
US9550610B2 (en) | 2017-01-24 |
WO2010138276A1 (en) | 2010-12-02 |
CN102459016A (en) | 2012-05-16 |
US20170320634A1 (en) | 2017-11-09 |
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Legal Events
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Owner name: THE GLAD PRODUCTS COMPANY, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KENT, GREGORY STUART;BROERING, SHAUN T.;SIGNING DATES FROM 20090505 TO 20090506;REEL/FRAME:040405/0359 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |