KR20020022678A - Elastic top drawstring bag and method of manufacturing the same - Google Patents

Abstract

Tightening strapped bag 10 includes a pair of both sides and a pair of thermoplastic body panels 16 joined together along a bottom 18 connecting the two sides. This bag 10 may be opened along an inlet end formed opposite the bottom 18. At least one of the body panels 16 forms an edge end 22 along the inlet end 20 of the bag 10, which surrounds the flexible thermoplastic clamping string 24. One or more holes 26 for clamping straps disposed within the edge ends 22 expose the clamping straps 24 so that they can be pulled through the holes 26 and used as handles to seal the bag. . An elastic feature at the top is provided by connecting the elastomeric strip 20 to the annular section of the clamping strap 24 enclosed within the edge end 22. In particular, the clamping string section is corrugated with one or more routes forming a series of tops 35 and valleys 34, with each valley 34 being sealed to a strip 30 of elastomer.

Description

ELASTIC TOP DRAWSTRING BAG AND METHOD OF MANUFACTURING THE SAME}

Sealable polymer packaging materials such as waste bags are common necessities. These bags are distributed to the user in interconnected roll-shaped bags or in separate packaging boxes. In the case of a bag that is supplied in roll form, one end of the bag, i.e., the bottom, is thermally sealed and connected to an adjacent bag along the perforated line, and the other end of the bag, i.e., the inlet end that is open, is independently along another perforated hole. It is fixed to the adjacent bag. In the case of pre-separated bags, usually one bag is removed from the packaging box and adjacent bags are superimposed or shuffled in such a way that they can be drawn out towards the opening of the guarantee box.

In order for the conventional polymer bag to be fully filled and the user to seal it, the bag body close to the opening inlet end of the bag may be fitted and strapped or secured using a separate strap member supplied by the bag vendor. String members typically include a plastic strip having locking means for squeezing and tightening the neck of the elastic wire, rubber band or bag coated with paper. However, the need for a separate string member causes additional costs to the manufacturer or even to the holder. In addition, the separate string member is cumbersome because it is easily lost. To overcome this problem, a polymer package having an integrated closed system is provided. Such an integral closure system may be in the form of a string member, adhesive, or the like.

Particularly good sealing systems are clamping tapes or clamping straps integrally formed on the bag body. Bags of this kind are in the form of a pair of flexible thermoplastic body panels joined together along a pair of both sides and a bottom connecting the two sides. The bag can be opened along an inlet end formed opposite the bottom. The body panel forms an hem along the inlet end of the bag, which surrounds the flexible thermoplastic clamping strap. One or more holes for the clamping straps disposed within the edge ends expose the clamping straps 24 so that they can be pulled through the holes and used as handles to seal the bag.

When the user uses a bag with a strap tied as a liner in the bin, the bag body is inserted into the bin so as to extend downward of the bin. Pull the inlet end of the bag including the edge end to loosely mount it around the top of the bin. Until now, the drawback of such a bag with a strap is that when the user throws the trash into the bag, the inlet end of the bag falls back into the trash. This annoys the user because the inlet end of the bag has to be lifted from the trash around the top of it. If the user does not notice that the inlet end of the bag has dropped into the trash, the garbage discarded by the user is not put in the bag but is in contact with the wall of the trash bin and becomes dirty there. This defeats the purpose of providing a bag to serve as a lining bin.

FIELD OF THE INVENTION The present invention relates generally to plastic bags, and more specifically, to the top of the trash can, allowing the inside of the vat to be lined up, while at the same time having its own strength and elasticity at the top that does not interfere with the manipulation of the drawtape. The sin of having is about a bag with a string.

1 is a plan view of a bag with a clamping strap with a top feature of elasticity in accordance with the present invention,

2 is a cross sectional view of a strip of elastomer used in a bag with a clamping strap secured to the loop section of the clamping strap and in an unpulled state;

3 is a cross sectional view of a strip of elastomer secured to the loop section of the clamping string and in a pulled state;

4 is a perspective view of a bag with a clamping strap firmly mounted in a trash can,

5 is a perspective view of a bag with a clamping string separated from the trash bin and sealed using the clamping strap,

6 is a view schematically showing a manufacturing method of a bag with a fastening strap.

In order to solve the above-mentioned problems, the present invention provides a bag with a clamping strap having an elastic feature at the top so that the bag can fit tightly on the top of the trash can. It is desirable that this upper elastic feature is made so as not to interfere with its inherent strength and manipulation of the string.

According to one embodiment of the present invention, a bag with a clamping strap comprises a pair of both sides and a pair of flexible thermoplastic body panels joined together along a bottom connecting the two sides. The bag can be opened along an inlet end formed opposite the bottom. At least one of the body panels forms an edge end along the inlet end of the bag, which edge end surrounds the flexible thermoplastic clamping strap. One or more holes for the clamping straps disposed within the edge ends expose the clamping straps so that they can be pulled through the holes and used as handles to seal the bag. The upper elastic feature is provided by an elastomeric strip connected to the annular section of the clamping strap which is enclosed at the edge end. Specifically, the clamping strap section is crimped into one or more loops that define a series of tops and valleys, each valley enclosed in an elastomeric strip.

The manufacturing method of bag with clamping string is as follows. In the first step, the thermoplastic tube is extruded in the machine direction to flatten and then cut in half along the centerline. Each half of the tube comprises a pair of flexible thermoplastic sheets joined together along a floor disposed in the machine direction. These sheets can be separated from each other along the inlet end formed opposite the bottom. In the second step, the sheet is passed through a static grounder in the machine direction to make an edge end on each sheet along the inlet end. In a third step, the clamping made by the manufacturing step forms holes for the straps clamped at the edge ends on each sheet at regular intervals consistent with the width of the bag with the straps. The holes for the clamping straps formed in one sheet edge end coincide with the corresponding clamping holes in the edge ends formed in the other sheet. In the fourth step, the clamping of the flexible thermoplastic is inserted into the edge end on each sheet. Before inserting this strap, the elastomeric strip is secured to the annular section of the clamping strap as described above. In a fifth step, the edge on each sheet is sealed on the corresponding sheet in the machine direction. In a sixth step, the clamping enclosed at one sheet edge end 22 is enclosed at the other sheet edge end in a position coincident with the hole for the clamping cord 24. In a seventh step, the sheets are sealed against each other along the side closure structure in the transverse direction of the machine direction and separated into individual fastening bags in the side closure structure. The bag can then be packed in a box for sale to the user.

The above summary of the present invention does not represent each embodiment or every aspect of the present invention, which is intended for the following drawings and detailed description.

Other objects and advantages of the present invention will become more apparent from the following description described in detail with reference to the accompanying drawings.

While the invention can be variously modified and modified, only specific embodiments thereof are shown in the drawings and will be described in detail below. However, the present invention is not limited to this particular embodiment, and the protection scope will encompass all modifications, equivalents and modifications belonging to the spirit and scope of the present invention as defined in the appended claims.

1 shows a clamping strapped bag 10 comprising a pair of flexible thermoplastic body panels 12, 14 (panel 14 is hidden behind panel 12 in FIG. 1 and shown in FIG. 4). Shown, these panels are coupled to each other along a pair of both sides 16a and 16b and a bottom 18 connecting these sides 16a and 16b. The bag 10 may be opened via an inlet end 20 formed opposite the bottom. Each body panel 12, 14 defines a respective edge end 22 hem formed along the inlet end 20 of the bag 10. The edge ends 22 in each of the body panels 12 and 14 enclose each flexible thermoplastic clamping string 24. In order to keep the clamping string 24 in the edge end 22, this edge end 22 is thermally sealed along the suture 23 of the corresponding edge end in each panel 12, 14.

A pair of fastening holes 26a, 26b are formed in the edge end 22 on each panel 12, 14 at each side 16a, 16b. Clamping holes 26a, 26b formed at the edge ends 22 on the panel 12 coincide with corresponding clamping holes 26a, 26b formed at the edge ends on the other panel 14. Clamping strings 24 enclosed at edge ends 22 on panel 12 are edged at edge ends on panel 14 at sutures 28a, 20b that correspond to corresponding clamping holes 26a, 26b. The accumulated sin is thermally sealed to the strings. Clamping string holes 26a, 26b provide heat sealing bars that allow access to clamping string 24 to make clamping string closures 28a, 28b. Moreover, when the clamping strap 24 is fully installed in the bag 10, the clamping strap 24 is pulled through the holes 26a and 26b so that it can be used as a handle for sealing the bag as shown in FIG. (26a, 26b) exposes the string of sin 24.

The clamping strapped bag 10 has a top characteristic of elasticity that allows the bag 10 to fit firmly into the top of the wastebasket and to fit inside the wastebasket while at the same time not disturbing the manipulation of the clamping string. . This upper elastic feature is provided by an elastomeric strip 30 connected to the loop section 32 of the clamping strap 24 enclosed at the edge end 22 of each of the panels 12, 14. Specifically, the loop section 32 of the clamping string is corrugated with a plurality of loops forming a series of tops 35 and valleys 34, each valley thermally sealed to the elastomeric strip 30. . This is shown in FIG. 2 in a cross-sectional view showing the elastomeric strip 30 secured to the annular clamping strap section 32 in the valley 34. The total length of the elastomeric strip 30 is shorter than the length of the clamping thong 24, preferably preferably of approximately the same dimensions as the footprint of the annular clamping thong section 32. The footprint of the annular clamping section 32 may be defined as the horizontal distance between the leftmost valley 34 and the rightmost valley 34, as shown in FIG.

Referring again to FIG. 1, the clamping string 24 is sealed at four specific locations along the inlet end 20 of the bag 10. The above-mentioned sin has two of four string sutures 28a and 28b. In the third and fourth closure positions are anchor sutures 38 which are visible at the center of the edge end 22 on each panel 12, 14. This anchor suture 38 utilizes a clamping string 24 having adjacent layers of the edge end 22.

Referring to FIG. 4, the elastomeric strip 30 includes an edge end 22 so that the inlet end of the strapping bag 10 can be pulled over the top of the bin 36 and firmly mounted around it. To make it possible. Depending on the size of the bin 36, the elastic strip 30 is stretched by mounting the bag 10 to the bin 36 so that the " The wavelength "becomes longer and the height of the top 35 becomes lower. 3 is a cross-sectional view of elastomeric strip 30 secured to annular section 32, with elastomeric strip 30 partially extended. Elastomeric strip 30 extends to the point where the length of elongated elastomeric strip 30 becomes equal to the length of the clamping straps that make up the annular clamping strap section 32, ie the "wavelength" of each loop. It can reach this maximum and extend to the point where its top 35 becomes zero. Beyond this point, the tension characteristics of the inelastic clamping strap 24 control the movement of the dual component structure, one component being provided by the clamping strap 24 and the other component of the elastomeric strip 30. Provided by The dual component structure effectively combines the elastic motion of the elastomeric strip 30 with the strength characteristics of the inelastic clamping string 24.

FIG. 6 is a diagram schematically illustrating a method of making a bag 10 with a fastening strap. In the first step, the thermoplastic tube 50 is extruded in the machine direction to flatten using a roll of the flattening device 51 and then cut in half by the static cutter 52 along the centerline 54. Each half 50a, 50b of the tube 50 comprises a pair of flexible thermoplastic sheets joined together along a bottom 18 arranged in the machine direction. The machine direction is indicated by arrow MD in FIG. 6. The sheets may be separated from one another along the inlet end adjacent to the center cut line 54 and opposite the bottom 18.

In a second step, the sheets are passed through a static grounder 56 in the machine direction MD to make an edge end 22 on each sheet along the inlet end 20.

In a third step, a single hole cutter 58 is provided with the edge end 22 of each sheet at regular intervals consistent with the predetermined width of the clamped bag 10 produced by the manufacturing step. The clamp forms a hole 26 for the string. Clamping holes 26 formed in the edge ends 22 of one of the sheets coincide with corresponding clamping holes in the edge ends formed in the other sheet.

In the fourth step, the clamping of the flexible thermoplastic from the feed roll (not shown) is fed continuously and inserted into the edge end 22 on each sheet. The clamping strap 24 matches the predetermined width of the clamped strapped bag 10 produced by the manufacturing step and the annular section 32 arranged at regular intervals along the clamping strap 24. Equipped. Prior to inserting the elastomer strip 30, the strip 30 is secured to the corresponding annular section 32 of the clamping string 24, as described with reference to FIGS. 1 to 5.

In a fifth step, the static heat sealing device 60 produces an edge seal 23 which secures the edge end 22 on each sheet to the corresponding sheet in the machine direction MD.

In the sixth step, the heat sealing device 62 is surrounded by a clamping strap 24, which is enclosed in one sheet edge end 22, at a position coinciding with the hole 26 for clamping straps. The sin, which secures it to the string, forms a string suture 28. These clamping sutures 28 traverse the machine direction MD. The heat sealing device 62 also fabricates the anchor closure 38 (see FIG. 1).

In a seventh step, the heat sealing and puncturing device 63 traverses the machine direction MD and at regular intervals consistent with the predetermined width of the clamped bag 10 produced by the manufacturing step. The disposed side closure structure 64 is formed. Each side suture structure 64 includes a perforation line disposed between a pair of spaced suture lines. This perforation line allows the sheet to be separated into a bag 10 with a tightening strap. The bag 10 may then be packed in a box for sale to the user.

In the bag with a basic fastening strap according to an embodiment of the present invention, the body panels 12 and 14 are linear low density polyethylene (LLDPE), low density polyethylene (LDPE), high pressure polyethylene (HPPE), high molecular weight high density polyethylene (HDPE). ), Polyesters, polystyrenes, or mixtures of these polymers. In addition, the body panel may be composed of a film co-extruded by combining two or more of the aforementioned polymers. Each panel preferably has a thickness in the range of about 0.4 mils to about 2 mils.

The clamping string 24 is composed of a polymer material having high yield strength and low elasticity in the drawing direction. These properties mean that when the clamping string 24 is subjected to high stress in the drawing direction, the clamping string 24 substantially retains its shape and does not extend beyond its original length. In some conventional clamping straps, when the belt is pulled hard to seal the bag, the clamping string becomes thinner over its entire length, and the area gripped by the hand becomes narrow or threaded, making the hand feel pain. The polymeric material of the clamping string 24 minimizes this "roping". Suitable polymers include, but are not limited to, high molecular weight high density polyethylene, medium density polyethylene (MDPE), linear low density polyethylene, and low density polyethylene. The clamping string 24 preferably has a thickness in the range of about 1 mil to about 5 mils, with thicker strings suitable for carrying heavier loads.

Elastomeric strip 30 is composed of a polymeric material such as elastomeric polyethylene having a low yield strength and high elasticity for each of the yield strength and elasticity of the clamping string 24. These properties mean that when high stress is applied to the elastomeric strip 30, the strip 30 can be stretched to several times its original length and then returned to its original length without changing its shape. Elastomeric strip 30 preferably has a thickness in the range of about 1 mil to about 10 mils.

Although the invention has been described in terms of one or more specific embodiments, those skilled in the art will recognize that many modifications and variations can be made which fall within the spirit and scope of the invention as defined in the appended claims. something to do.

Claims (19)

A pair of thermoplastic body panels joined together along a pair of both sides and a floor connecting these sides, wherein at least one of the body panels extends along an inlet end disposed opposite the floor and one or more clamping The pair of thermoplastic body panels forming an edge end having a hole for strings, A flexible thermoplastic clamping strap, which is enclosed at the edge end and has an annular section pleated with one or more loops forming a series of tops and valleys, through the hole for the strap clamping the strap. The flexible thermoplastic clamping strap, partially exposed by the opening for use as a handle to pull the bag to seal, And a squeezing strap comprising an elastomeric strip connected to the trough of the annular section of the squeezing strap. The bag of claim 1 wherein the elastomeric strip is thermally sealed to the valleys of the annular section of the strap. The bag of claim 1 wherein the total length of the elastomeric strip is shorter than the length of the strap. 4. The clamping strapped bag of claim 3 wherein the total length of the elastomeric strip is approximately equal to the length of the footprint of the annular section of the clamping strap. The bag of claim 1, wherein the edge ends, the elastomeric strip, and the annular sections of the clamping strap are sealed together at anchor sutures. 6. A clamping strap bag according to claim 5, wherein the anchor suture is located in a central one of the valleys of the annular section of the clamping strap. The bag of claim 1 wherein the elastomeric strip has a greater elasticity than the elasticity of the clamping strap and a yield strength less than the yield strength of the clamping strap. 8. The method of claim 7, wherein said elastomeric strip is comprised of elastomeric polyethylene and said clamping strap is comprised of a polymeric material selected from the group comprising high molecular weight high density polyethylene, medium density polyethylene, linear low density polyethylene and low density polyethylene. A bag with a guilt strap characterized in that. A pair of thermoplastic body panels joined together along a pair of both sides and a bottom connecting the two sides, the body panels extending along an inlet end disposed opposite the bottom and for one or more corresponding clamping straps. A pair of thermoplastic body panels adapted to form edge ends each having a hole, A pair of flexible thermoplastic clamping straps enclosed on each edge end and enclosed with each other, wherein each clamping strap is each annular corrugated with one or more loops forming a series of tops and valleys A flexible thermoplastic clamping strap having a section, the respective clamping strap being partially exposed by the corresponding clamping strap opening for use as a handle for sealing the bag by pulling through the strap clamping strap; And each pair of clamping straps comprises a pair of elastomeric strips connected to the valleys of the annular section of the strap. 10. The clamping strap of claim 9, wherein the clamping straps at each of the corresponding edge ends are located on both sides, and the clamping straps at the edge of one of the body panels is substantially one of the other of the body panels. Clamping backed bag, characterized in that it coincides with the hole of the clamping bar at the edge of the hem. 11. A bag with a strapping strap according to claim 10, wherein the strapping straps are sealed together in a pair of clamping strap sutures that coincide with holes for the strapping straps. The bag with a strap according to claim 11, wherein the edge end is sealed to a corresponding body panel along the suture of each edge end extending along the inlet end of the bag. 13. The clamping bag of claim 12 wherein the edge ends, the elastomeric strips and the annular sections of each clamping strap are sealed together at anchor sutures. Forming a thermoplastic tube flattened in the machine direction, Dividing the thermoplastic tube into a first portion and a second portion along a dividing line extending in the machine direction, each of the first and second portions being coupled to each other along a floor disposed in the machine direction; Said dividing step comprising a thermoplastic sheet, said sheets being separable from each other along an inlet end formed opposite said bottom; Forming an edge end along the inlet end in at least one of the sheets; Forming a hole for clamping at the edge end at regular intervals to match the desired width of the clamping bag; Inserting a flexible thermoplastic clamping strap into the edge end, the clamping strap having an annular section pleated with one or more loops forming a series of tops and valleys, wherein the elastomeric strip is The inserting step of allowing the clamping to be connected to the valley of the annular section of the string, Sealing each of the sheets along a side closure structure in a direction nearly transverse to the machine direction to make each bag with a strapping bag. 15. The method of claim 14 wherein the total length of the elastomeric strip is shorter than the length of the tightening straps. 16. The method of claim 15 wherein the total length of the elastomeric strip is approximately equal to the length of the footprint of the annular section of the tightening strap. 15. The method of claim 14, further comprising sealing the edge ends, the elastomeric strips, and the annular sections of the clamping straps together at anchor sutures. 15. The method of claim 14 wherein the elastomeric strip has a greater elasticity than the elasticity of the clamping strap and a yield strength less than the yield strength of the clamping strap. Extruding the thermoplastic tube in the machine direction, Flattening the thermoplastic tube, Cutting the thermoplastic tube in half along a cutting line extending in the machine direction, each half of the tube comprising a pair of flexible thermoplastic sheets joined together along a floor disposed in the machine direction, wherein The cutting step, wherein the sheets are detachable from each other along an inlet end formed opposite the bottom; Folding the sheet along the inlet end to make an edge edge in each sheet, Forming a hole for the strap on the edge of each of the sheets at regular distances to match the desired width of the bag with the strapping bag. The forming step, wherein the clamping at the edge end of the other one of the sheets is substantially coincident with the hole for the string; Inserting a flexible thermoplastic clamping strap into the edge end on the sheet, the clamping strap having an annular section pleated with one or more loops that form a series of tops and valleys, the elastomeric strip The inserting step of connecting the constriction to the bone of the annular section of the string, Sealing edges on each sheet to corresponding sheets in the machine direction; Sealing the edges of one of the sheets at the edges of one of the sheets with a string of edges at the edges of the other edges of the sheets at a position substantially coincident with the holes for the straps for tightening the strings; Sealing each of the sheets along a side closure structure in a direction nearly transverse to the machine direction to make each bag with a strapping bag.