JP2003155044A - Gusseted bag with fastener tape and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gusseted bag with a fastener tape and its manufacturing method, made of a laminated film, provided with a fastener tape heat-bonded to an inner face of a mouth of the bag, excellent in usability, and capable of simplifying its manufacturing steps to have excellent productivity. SOLUTION: Both left and right sides of a laminated film 1 provided with a sealant layer laminated on the innermost layer thereof are folded back inwardly to form gusset portions having inward folded pleat-like folded-back parts 2a and 2b, respectively. Both side ends of the laminated film 1 folded back are made to overlap with each other on one of the sides of the laminated film 1 folded back. A fastener tape 50 whose male and female fitting portions are fitted to each other in advance is laterally inserted into the same side as that of the folded pleat-like folded-back parts 2a and 2b on both the sides, or into the side different from their side, so as to extend from the one of the sides of the laminated film 1 folded back, where its side ends are overlapped each other, to the other side thereof, and is heat-bonded to an inner face of a mouth of a bag. The side of the bag is then heat-sealed at a side seal portion 4, thus forming the gusseted bag with the fastener tape. In addition, an outer side of the portion of the bag, where the fastener tape is heat-bonded, can be heat-sealed with a thermal adhesive having easily peeling properties.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gusset bag with a zipper tape, and a method for manufacturing the same, and more particularly, a zipper tape having gusset portions on the left and right side portions of the bag and which can be opened and closed at its mouth. The present invention relates to a gusset bag with a zipper tape to which is attached and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a gusset bag provided with gusset portions on the left and right sides of the bag, that is, a fold-back portion on the inner side is self-supporting and can be compactly packed for its capacity. It is used for various purposes, and in order to improve the usability of this gusset bag, there is a growing demand for attaching a zipper tape that can be opened and closed at its mouth.

However, the gusset bag has a problem that the attachment of the zipper tape is troublesome because the gusset portion has folded-back portions on both right and left sides. Moreover, since the flow direction of the laminated film of the bag and the attachment direction of the zipper tape are different, there is a problem that the processing becomes complicated.

In order to solve such a problem, for example,
Japanese Unexamined Patent Publication (Kokai) No. 5-270552 discloses a tubular bag having front and rear planes forming a gusset bag and two side surfaces formed with folding lines that are folded inward in a fold shape. After forming the main body once by a commonly used method, from the four corners of the bag main body to open the mouth of the bag main body, from the two corners that are both ends of one of the flat portions, Make incisions to the specified distance inward,
Forming two foldable door-shaped open faces, and fixing the male and female members of the zipper on the open faces respectively, and then closing the front and back open faces to fit the zipper,
After that, a gusset bag with a zipper formed by fusing the vicinity of the cut portion and the upper end portion is proposed.

However, even when such a method is adopted, although the bonding itself of the male member and the female member of the zipper to the inner surface of the mouth of the bag becomes simple, the formation of the tubular bag body and
Adhesion of the zipper is a separate step, and when attaching the zipper, cut inward from the two corners of both ends of one flat part of the bag body that was once formed into a tubular shape by a predetermined distance. Form two door-shaped opening surfaces that can be inserted and folded, and heat-bond the male and female members of the zipper separately on the opening surfaces, then close the front and rear opening surfaces to close the zipper. It is necessary to fit them, and it is necessary to fuse the vicinity of the place where the notch is made and the upper end to complete the gusset bag with a zipper, which does not solve the complexity of the manufacturing process, which is still a problem. was there.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a gusset made of a laminated film to which a zipper tape is attached by thermal adhesion. It is a bag, and the zipper tape can be opened and closed freely, and the bag is easy to use. In addition, the zipper tape can be easily attached in-line with the bag-making process when it is manufactured. An object of the present invention is to provide an attached gusset bag and a manufacturing method thereof.

[0007]

The above-mentioned problems can be solved by the present invention described below. That is, the invention according to claim 1 is a gusset having a fold-back portion on the inside of the laminated film in which the sealant layer is laminated on the innermost layer, is folded back so that the sealant layer is on the inside. One end of the laminated film is formed by overlapping the ends of the folded laminated films on one side with each other and heat-bonded to form a tubular bag body, which is the mouth of the bag. A gusset bag with a zipper tape, which is formed by thermally adhering a zipper tape that can be opened and closed on the inner surface in the vicinity thereof, wherein the zipper tape is laterally attached to the other side of the bag body part to which the zipper tape is attached. A gusset bag with a zipper tape, which is inserted up to the side part on the same side of the fold-back part on both sides or on a different side of the other fold-back part and is heat-bonded. .

In the present invention, the zipper tape is
As shown in FIG. 4, a tape body provided with a convex strip that can be fitted to each other and a tape body provided with a concave strip are provided on the inner surface of the opening of the bag. Arranged so that the strips face each other, the tape body is attached to the bag by heat-adhesion, and the bag can be opened and closed easily and repeatedly by fitting or disengaging the convex strips and the concave strips. Is.

Further, when such a zipper tape is attached to a bag, in the present invention, the tape body provided with the convex strip and the tape body provided with the concave strip are fitted in advance in the state described above. It is inserted laterally from the heat-bonded side of the bag body and heat-bonded at a predetermined position. For this purpose, the surfaces of the zipper tape provided with the convex or concave stripes are fused. In order not to do this, each tape body of the zipper tape is formed of two or more layers, and the fusion temperature of the resin on the side where the ridges or grooves are provided is the same as that of the heat-adhesive resin layer on the side in contact with the bag. It is preferably formed so as to be higher than the heat bonding temperature by about 5 to 25 ° C.

By adopting the above-mentioned structure, since the bag is a gusset bag, the bag after the contents are filled can be self-supporting and can be compactly packed for its capacity. Also, since the zipper tape that can be opened and closed is heat-bonded to the inner surface near the opening end that is the mouth of the gusset bag over the entire width of the front and rear wall surfaces, the fitting of the zipper tape must be disengaged when the contents are taken out. Thereby, the mouth portion can be widely opened, and the contents can be easily taken out. Even after a part of the contents is taken out, the zipper tape can be easily fitted and the bag can be resealed, so that the contents can be safely stored.

The production of such a gusset bag with a zipper tape is carried out by using a conventional gusset bag making machine after folding the laminated film of the bag and before heat-sealing the side portions. By incorporating a zipper tape attachment device into the section, and inserting the zipper tape from the lateral direction and thermally adhering it, it is possible to attach the zipper tape in-line with bag making. Since it is not necessary to separately heat-bond the tape body and the tape body provided with the recessed strip, the manufacturing process can be greatly simplified and the manufacturing can be performed with high productivity.

According to a second aspect of the invention, the outer edge portion of the gusset bag to which the zipper tape is heat-bonded is coated with an easy-peel thermal adhesive on its inner surface and sealed by heat-bonding. The gusset bag with a zipper tape according to claim 1 characterized in that.

The above-mentioned easy-peelable thermal adhesive is not particularly limited and may be any one as long as the sealing strength can be weakened within a certain range as compared with the case where the sealant layers of the laminated film of the bag are heat-sealed, For example, a heat seal agent for part coat, specifically, an ethylene-vinyl acetate copolymer (EVA) -based resin emulsion, a chlorinated polypropylene-based resin solution, or the like can be preferably used.

By adopting such a structure, in addition to the effect of the invention described in claim 1, the outer edge portion of the zipper tape is heat-sealed with an easy-peel thermal adhesive. Therefore, even if the gusset bag with the zipper tape filled with the contents is accidentally disengaged from the zipper tape at the distribution stage, the contents will not be scattered to the outside and can be safely sealed. Even when the contents are taken out, the easy-peel heat seal portion can be easily peeled off, and then the fitting of the zipper tape can be disengaged to take out the contents.

According to a third aspect of the present invention, the outer edge of the gusset bag to which the zipper tape is heat-bonded is sealed by a heat seal part, and the bag is provided between the heat seal part and the zipper tape. 2. The gusset bag with a zipper tape according to claim 1, further comprising opening means.

The opening means for the bag may be an opening instruction line such as a cut line displayed by printing or an opening instruction mark, and the following easy opening for facilitating the actual opening operation by tearing. It may be sexual means. Further, a plurality of these may be appropriately combined and provided. As the easy-opening means, for example, in addition to a method of providing a notch that is commonly used in a bag made of a normal laminated film, a method of providing a half-cut line by laser light irradiation, or uniaxial stretching in the laminated film of the bag. There is a method of laminating films (in this case, the uniaxially stretched film is used so that the stretching direction thereof coincides with the opening direction of the bag), and these may be used alone, or, for example,
The notch and the half cut line or a uniaxially stretched film may be appropriately combined and used, for example.

As the notch, a notch such as a single letter shape or a V shape is usually used, but the shape is not particularly limited,
Any shape can be used as long as it has an acute angle portion in the cutting direction. Also, when the half-cut line is provided, the half-cut line is not limited to the linear half-cut line, and the half-cut line may be provided as an intermittent half-cut line such as a perforated line. Further, although one such half-cut line may be provided, assuming that the tearing direction is deviated, one or two half-cut lines may be provided on each side of the center half-cut line. Can also be provided in a shape that converges on the parallel or central half-cut line.

By adopting such a configuration, in addition to the function and effect of the invention described in claim 1, the sealability of the gusset bag with the zipper tape can be further improved, and
When using the contents filled in the bag, it becomes easier to open the bag at the correct position (outside the zipper tape).

According to a fourth aspect of the present invention, there is provided a gusset portion on both left and right sides of the bag, and a zipper tape is formed by thermally adhering an openable / closable zipper tape on the inner surface near one opening end which is the mouth of the bag. A method for manufacturing a gusset bag with a zipper tape, which comprises at least the following steps (1) to (6). That is, (1) while feeding a long laminated film having a sealant layer laminated on the innermost layer in the longitudinal direction, the left and right sides of the laminated film are folded back so that the sealant layer is on the inside, and a fold-back portion is formed inside. A step of forming a gusset portion having the sealant layers at the end portions of the laminated films on both sides that are folded back, and stacking the sealant layers on one side portion to form a tubular bag body portion. (2) While intermittently feeding the tubular bag main body portion at a predetermined pitch in the longitudinal direction, a zipper tape is guided from between the overlapping portions of the laminated films on the side portions of the bag main body portion by a guide. Lateral direction (direction orthogonal to bag feed direction)
The step of inserting up to the other side portion on the same side of the fold-back portion on both sides or on the different side of the other fold-back portion. (3) A step of heating and pressing the inserted zipper tape from the outside of the bag to heat-bond it to the inner surface of the bag. (4) A step of heat-sealing the outer edge of the zipper tape heat-bonded to the bag. (5) A step of heat-sealing the laminated portion of the laminated film on the side portion of the bag body portion. (6) A step of cutting the bag main body having the side portions heat-sealed into individual length bags. It is a manufacturing method including.

In the above manufacturing method, the zipper tape which is inserted in the lateral direction from between the overlapping portions of the laminated films on the side portion of the bag body portion in the step (2), the zipper tape according to claim 1
As described in the invention described in (1), a zipper tape composed of a tape body provided with a convex strip and a tape body provided with a concave strip that can be fitted to each other is used in a pre-fitted state. Yes, and each tape body is
It is formed by multiple layers.

By adopting such a manufacturing method, it is possible to attach the zipper tape in-line with the bag making machine, and at the same time, the tape body provided with the convex stripes and the tape body provided with the concave stripes of the zipper tape can be attached. Since they can be heat-bonded in a state where they are fitted together, instead of heat-bonding separately
The quality of the heat-bonding device can be simplified and the manufacturing process can be greatly simplified as well as the quality of the fitting can be improved by eliminating the fitting failure due to the displacement of the two. Therefore, the gusset bag with the zipper tape of the invention according to any one of claims 1 to 3 can be manufactured with good quality and high productivity.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The materials used for the gusset bag with the zipper tape of the present invention, that is, the laminated film of the bag and the zipper tape will be described below. First, as the laminated film used for the gusset bag with the zipper tape of the present invention, a laminated film mainly made of plastic is used, but it is not particularly limited, and various configurations are adopted depending on the contents to be filled. You can In a simple structure, it can be configured by laminating a sealant layer on the base film layer, depending on the required performance, between the base film layer and the sealant layer, as an intermediate layer, water vapor or other The gas barrier layer, the light shielding layer, the strength improving layer, and the like can be laminated. The intermediate layer is laminated with a uniaxially stretched polypropylene film, a uniaxially stretched high-density polyethylene film, or the like so that the stretching direction thereof coincides with the opening direction of the bag in order to facilitate tearing in a certain direction when opening the bag. Can also be used. The base film layer, the intermediate layer, and the sealant layer may each be formed as a single layer, or may be formed by laminating a plurality of layers.

In addition to the biaxially oriented polypropylene film, biaxially oriented polyester films such as biaxially oriented polyethylene terephthalate film and biaxially oriented polyethylene naphthalate film, nylon 6, nylon 66, MXD6 ( A biaxially stretched polyamide film such as poly (meta-xylylene adipamide) can be preferably used, but various engineering plastic films can also be used if necessary. These may be used alone or in combination of a plurality of layers.

When the intermediate layer is a gas barrier layer, the saponified ethylene-vinyl acetate copolymer (EV
OH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), etc., as well as aluminum foil, or biaxially stretched nylon film provided with a vapor-deposited layer of silica, alumina, aluminum, etc., or a coating layer of PVDC ( ON film), biaxially oriented polyethylene terephthalate film (PET film), biaxially oriented polypropylene film (OPP film) and the like can be used. Among these, a film provided with an aluminum foil or an aluminum vapor-deposited layer is opaque and thus can also serve as a light-shielding layer. When the intermediate layer is used as the strength improving layer, the substrate film may be appropriately additionally laminated, or a biaxially stretched high density polyethylene film or the like may be laminated also as a moistureproof layer. A publicly known dry lamination method or extrusion lamination method (sandwich lamination method) can be used for laminating the base film layer and the intermediate layer.

For the innermost sealant layer, low density polyethylene (LDPE), linear low density polyethylene (L.
LDPE), ethylene / α-olefin copolymer,
An ethylene / vinyl acetate copolymer, an ethylene / acrylic acid copolymer, an ethylene / acrylic acid ester copolymer, polypropylene or a copolymer thereof can be used. For the lamination of the sealant layer, the above resin may be formed into a film and laminated by a dry lamination method or an extrusion lamination method, or the above resin may be extrusion coated to laminate.

Next, the zipper tape used in the present invention will be described with reference to FIG. FIG. 4 is a schematic enlarged cross-sectional view for explaining the structure of the zipper tape used in the present invention. The zipper tape 50 shown in FIG. 4 is a laminated film on both sides in the vicinity of one opening end that is already the mouth of a gusset bag. It is shown in a state in which the inner surfaces of Nos. 1 and 1 are heat-bonded and the fitting is disengaged. That is, the zipper tape 50
Is a tape body 12 with a ridge having a male fitting portion 14 heat-bonded to the inner surface of one laminated film 1 and a female heat-bonded to the inner surface of the other laminated film 1 so as to face the tape body 12. The tape body 13 with a groove having a mold fitting portion 15, and the tape body 12 with a groove and the tape body with a groove 13 each have two or more layers as described above. In the tape body 12 with ridges (two layers in the figure), the male fitting portion 14 side and the heat-adhesive resin layer 16 side thermally bonded to the laminated film 1 have concave portions. In the tape body 13 with strips, the female fitting portion 15 side and the heat-adhesive resin layer 16 side that is heat-bonded to the laminated film 1 are
It is formed of a resin having a different heat fusion temperature or heat adhesion temperature. However, at least the heat-adhesive resin layer 16 of the tape body 12 with convex stripes and the heat-adhesive resin layer 16 of the tape body 13 with concave stripes may be the same resin.

In the present invention, when the zipper tape 50 is heat-bonded to the inner surface of the gusset bag, the tape-shaped tape body 1 is used.
2 and the tape body 13 with recesses are heat-bonded to each other. Therefore, when the fitting portion side and the thermo-adhesive resin layer 16 side are the same resin, the fitted fitting portion side This is because the tape bodies are likely to be heat-sealed to each other, and the heat-sealing makes it impossible to dissociate the fitting portion. Therefore, the resin on the male fitting portion 14 side and the resin on the female fitting portion 15 side are not heat-sealed to each other, or in the case of heat-sealing, the heat-sealing temperature is the heat-adhesive resin layer 16
It is preferable that the temperature is higher by 5 to 25 ° C. than the heat-bonding temperature.

The selection of the resin for the male fitting portion 14 or the female fitting portion 15 side and the thermoadhesive resin layer 16 side of the zipper tape 50 as described above depends on the resin of the sealant layer of the laminated film 1 of the bag. Although it is necessary to determine in consideration of the relationship, for example, polypropylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, poly- When a 4-methylpentene-1 copolymer or the like is used, the heat-adhesive resin layer 1
The resin on the 6 side is a resin having a reduced density or molecular weight, a copolymer thereof, a resin having a high comonomer content in the copolymer, or a resin having a different melting point with the material. Can be appropriately selected and used so that the temperature difference can be provided.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings. However, the present invention is not limited to these drawings. 1 and 2 are plan views showing the construction of an embodiment of a gusset bag with a zipper tape according to the present invention. 3 (a) and 3 (b) are cross-sectional views for explaining a method of inserting the zipper tape when attaching the zipper tape to the gusset bag in the production of the gusset bag with the zipper tape of the present invention, respectively. B), the left and right sides of the laminated film 1 of the bag in which the sealant layer is laminated as the innermost layer are folded back so that the sealant layer is on the inside, and fold-back portions 2a, 2b are formed inside. The end portions of the laminated film 1 on both sides folded back are
In the figure, the left side portion (position of the side seal portion 4) is overlapped to form a tubular bag body portion having gusset portions on both left and right sides, and the zipper tape 50 is laterally attached from the overlapped side portion. It is the figure which showed the state inserted to the other side part in the direction (the right side part in the figure) so that it may become the same side of the fold-back part 2a, 2b of both sides,
(B) is a fold-back part 2a, 2b on both sides from the overlapped side part of the bag body part to the other side part (the right side part in the figure) of the zipper tape 50 in the lateral direction.
It is the figure which showed the state inserted so that it might become a different side. In the present invention, either of the above (a) and (b) insertion methods may be adopted.

In the gusset bag 100 with a zipper tape shown in FIG. 1, the left and right sides of the laminated film 1 in which the sealant layer is laminated as the innermost layer are folded back so that the sealant layer is on the inside, and is folded inward. Turn-back part 2a of the
A tubular folded bag body in which the gusset portions 3a and 3b having 2b are formed and the folded back end portions of the laminated film 1 are superposed on one side portion (the left side portion in the figure). Zipper tape in a state in which a tape body with a ridge having a male fitting portion and a tape body with a ridge having a female fitting portion are preliminarily fitted to each other while forming a portion As shown in (a) or (b) of FIG. 3, 50 is laterally extended to the other side (the side on the right side in the figure), and the fold-shaped folded-back portions 2a, 2b on both sides are on the same side. , Or the other folded-back part 2b on different sides, and heat and pressure are applied from the outside of the bag to heat-bond it to the inner surface of the bag body near the opening end, which serves as the mouth part. The side seal portion 4 heats the side portion of the bag body portion in which the end portions of the film 1 are overlapped. After sealing, the easy-peel thermal adhesive application part 5 previously applied to the inner surface of the laminated film 1 at the outer edge of the part where the zipper tape 50 of the gusset bag 100 is thermally adhered is attached to the upper sealing part 6. It is configured by heat sealing with. Since the lower open end of the gusset bag 100 with the zipper tape is used as a filling port for the contents, it is heat-sealed by the bottom seal portion 7 after filling the contents.

By adopting such a structure, the contents can be easily filled through the opening at the bottom, and the bottom seal portion 7 can be heat-sealed and completely sealed after the filling. The gusset bag 100 filled with contents has self-supporting property because the gusset portions 3a, 3b on both sides are spread forward and backward, and the body has a rectangular cross section and a flat bottom. In addition to improved capacity and appearance, it can be packaged compactly for its capacity.

When the filled contents are taken out, since the upper seal portion 6 has an easy peel property, the upper seal portion 6 can be easily peeled off by pulling the upper ends of the laminated films 1 on both sides back and forth. By doing so, the outside of the chuck tape 50 can be opened, whereby the chuck 50 can be opened and closed. Therefore, by disengaging the zipper tape 50 from the fitting, the contents can be taken out easily, and even after the part of the contents is taken out, it can be easily resealed and the contents can be safely stored. be able to. Furthermore, even after the entire contents are used, any contents can be newly filled and reused as a sealed bag for storage.

Next, the gusset bag 200 with the zipper tape shown in FIG. 2 is the same as the gusset bag 100 with the zipper tape shown in FIG. 1, but the outer edge of the zipper tape 50 heat-bonded to the upper part of the bag. It is configured by changing the sealing method and the unsealing method of the parts as follows, and the other configurations are all formed and configured in the same manner as the gusset bag 100 with the zipper tape shown in FIG. is there. That is, the method of sealing the outer edge of the zipper tape 50 is not easy peel heat sealing,
Similar to normal heat sealing, the upper edge of the bag is heat-sealed by the upper seal portion 6 using the sealant layer of the laminated film 1 of the bag, and the zipper tape 50 and the upper seal portion are used as the opening means. 6, the cutoff line 8 and spot-shaped heat seal parts 17 on both ends thereof,
17 is provided, and notches 9a and 9b are provided in that region.

The cut line 8 of the opening means can be prevented from being misused because the opening position can be clearly indicated only by the opening instruction line by printing or the like, but in the case of a gusset bag, the notch 9a,
When the upper part of the bag is torn along the cutting line 8 using 9b, the tearing is stopped at the ends of the folded-back portions 2a and 2b, so that scissors or the like must be used. Therefore, it is preferable that the cut line 8 is used in combination with an unsealing instruction line such as by printing or the like, together with an easily unsealing means such as a half-cut line by laser light irradiation or lamination of a uniaxially stretched film (easily tearable film).

Zipper tape 5 on top of the bag as described above
Due to the change of the sealing method of the outer edge portion of 0 and the opening method thereof, the sealing performance by the upper sealing portion 6 of the bag is perfect,
Although the ease of opening is somewhat different, there is no particular difference. Even when such a configuration is adopted, it is possible to obtain substantially the same operational effect as the gusset bag 100 with the zipper tape shown in FIG.

In the gusset bags 100 and 200 with the zipper tape shown in FIGS. 1 and 2, an easy peeling upper seal portion is provided on the outer edge of the zipper tape 50 so that it can be used for distribution of products. 6 or the upper seal portion 6 formed by a normal heat seal and the cut line 8 and the notches 9a, 9b as the opening means are provided, but depending on the use such as simply using as a storage bag,
These are not needed and can be removed.

[0037]

As described above in detail, according to the present invention, the zipper tape is a gusset bag made of a laminated film in which the zipper tape is attached to the upper portion of the bag, and the zipper tape has a good sealing property of the contents and the chuck. The bag can be opened and closed with tape and is easy to use, and also in the manufacturing process, the zipper tape can be easily attached in-line with the bag manufacturing process. There is an effect that the manufacturing method can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of a gusset bag with a zipper tape according to the present invention.

FIG. 2 is a plan view showing the configuration of another embodiment of the gusset bag with a zipper tape of the present invention.

3 (a) and 3 (b) are cross-sectional views illustrating a method of inserting a zipper tape when attaching the zipper tape to the gusset bag in the production of the gusset bag with the zipper tape of the present invention. .

FIG. 4 is a schematic enlarged cross-sectional view illustrating the structure of a zipper tape.

[Explanation of symbols]

1 laminated film 2a, 2b Folded back part 3a, 3b Gusset part 4 Side seal part 5 Easy peel thermal adhesive application part 6 Upper seal part 7 Bottom seal 8 cut lines 9a and 9b notches 10 Plane 11 Sides 12 Tape body with ridges 13 Tape body with groove 14 Male fitting part 15 Female fitting part 16 Thermal adhesive resin layer 17 Heat seal part 50 zipper tape 100, 200 Gusset bag with zipper tape

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B31B 23/16 B31B 23/16 23/26 23/26 23/64 23/64 23/90 23/90 B65D 30/16 B65D 30/16 F 33/00 33/00 C 33/22 33/22 F term (reference) 3E064 AA13 BA17 BA27 BA28 BA29 BA30 BA36 BA38 BA55 BB03 BC08 BC18 BC19 EA04 HN01 HN06 HN13 HN18 HP01 3E075 BA42 BB14 BB15 CA02 DB14 DC01 DC48 DD12 DD45 DD47 DE17 GA05

Claims (4)

[Claims] 1. A laminated film having a sealant layer laminated as an innermost layer is folded back so that the sealant layer is inside, and a gusset portion having a fold-back portion is formed inside, and folded back. The ends of the laminated films on both sides are overlapped on one side and heat-bonded to form a tubular bag body, which can be freely opened and closed on the inner surface near one open end that becomes the mouth of the bag. A gusset bag with a zipper tape formed by heat-bonding a zipper tape, wherein
A chuck characterized by being inserted laterally up to the other side, on the same side of the fold-back portion on both sides, or on a different side of the other fold-back portion, and heat-bonded. Gusseted bag with tape. 2. The outer edge of the gusset bag to which the zipper tape is heat-bonded is coated with an easy-peel heat-bonding agent on its inner surface and sealed by heat-bonding. The gusset bag with a zipper tape according to claim 1. 3. The outer edge of the gusset bag to which the zipper tape is heat-bonded is sealed by a heat seal part, and a bag opening means is provided between the heat seal part and the zipper tape. The gusset bag with a zipper tape according to claim 1, wherein the gusset bag has a zipper tape. 4. A method of manufacturing a gusset bag with a zipper tape, which has gusset parts on both left and right sides of the bag, and in which an openable and closable zipper tape is heat-bonded to an inner surface near one opening end which is a mouth part of the bag. There are at least the following (1) to (6)
A method of manufacturing a gusset bag with a zipper tape, the method including: (1) A gusset having a fold-back portion on the inner side of which is folded back so that the sealant layer is on the inside while feeding a long laminated film having a sealant layer laminated on the innermost layer in the longitudinal direction. And a sealant layer at the ends of the folded laminated films on both sides is overlapped on one side to form a tubular bag body. (2) While intermittently feeding the tubular bag main body portion at a predetermined pitch in the longitudinal direction, a zipper tape is guided from between the overlapping portions of the laminated films on the side portions of the bag main body portion by a guide. Lateral direction (direction orthogonal to bag feed direction)
The step of inserting up to the other side portion on the same side of the fold-back portion on both sides or on the different side of the other fold-back portion. (3) A step of heating and pressing the inserted zipper tape from the outside of the bag to heat-bond it to the inner surface of the bag. (4) A step of heat-sealing the outer edge of the zipper tape heat-bonded to the bag. (5) A step of heat-sealing the laminated portion of the laminated film on the side portion of the bag body portion. (6) A step of cutting the bag main body having the side portions heat-sealed into individual length bags.