WO2020017149A1 - Zipper tape, and container with zipper tape - Google Patents

Abstract

This zipper tape is provided with: a first resin part, which is formed from a resin composition having a polyolefin as a main polymer and which includes a pair of base strips and engaging portions protruding from mutually facing surfaces of the pair of base strips and engageable with each other; and a second resin part, which is formed from a resin composition having a polyester as a main polymer and which covers surfaces opposite to the engaging portions from at least one pair of base strips.

Description

Zipper tape and container with zipper tape

The present invention relates to a zipper tape and a container with the zipper tape.

包装 In packaging for foods and other pharmaceuticals, an inner layer that comes into contact with the contents is often formed of a polyolefin resin film containing polyethylene or polypropylene as a main component, which is excellent in safety and heat sealability. However, since the polyolefin resin has high permeability and absorptivity of aroma components, it emits a plastic odor when used as an inner layer material, or impairs commercial value due to migration or adsorption of medicinal components and aroma components of contents. There are cases. Therefore, there is known a package using PET (polyethylene terephthalate) as an inner layer in which migration and adsorption of a medicinal component and an aroma component of the content are unlikely to occur.

For example, Patent Literature 1 describes a zippered bag using PET as an inner layer. The bag described in Patent Document 1 has an inner layer formed of heat-sealable PET, and the zipper member is a mixed resin obtained by blending PET and a polyester-based elastomer at a specific ratio, or a mixture obtained by adding a compatibilizer to PET and polyethylene. It is formed of resin. This allows the zipper member to be fused to the PET in the inner layer of the bag, and the zipper member is given flexibility to facilitate opening and closing.

Japanese Patent No. 6309925

However, when the zipper member is formed of a mixed resin as described in Patent Document 1, the flexibility of the zipper member and the fusion strength with PET greatly vary depending on the blend ratio. Was not easy. More specifically, when the ratio of PET is high, the flexibility of the zipper member is insufficient to make opening and closing difficult, and when the ratio of PET is low, the fusion strength between the PET and the bag inner layer becomes insufficient. . Therefore, in the bag with a zipper described in Patent Literature 1, it is not easy to stabilize the quality related to the zipper member.

Therefore, the present invention provides a zipper tape whose inner layer can be reliably fused to a container body containing PET while maintaining the functionality as a zipper tape such as a stable sealing property and an appropriate opening feeling. It is an object of the present invention to provide a container with a zipper tape in which a tape is fused to a container body.

According to an aspect of the present invention, a pair of base strips and a pair of base strips are formed of a resin composition containing a polyolefin as a main polymer, and each of the pair of base strips and the pair of base strips can be engaged with each other by protruding from mutually facing surfaces. And a second resin portion formed of a resin composition containing polyester as a main polymer and covering at least a surface opposite to the engaging portion of the pair of base strips. A zipper tape is provided.
According to the above configuration, since the engaging portion of the zipper tape is formed of the resin composition containing polyolefin as a main polymer, the functionality as the zipper tape such as stable sealing property and appropriate opening feeling is maintained. be able to. In addition, since the joining surface is formed of a resin composition containing polyester as a main polymer, the sealant layer can reliably fuse the zipper tape to the container body containing PET.

According to another aspect of the present invention, there is provided a container with a zipper tape, comprising the zipper tape described above and a container body to which the zipper tape is fused.
For example, the functionality of the PET layer and the functionality of the zipper tape can be made compatible by fusing the zipper tape to a container body in which the sealant layer contains PET to form a container with a zipper tape.

As described above, according to the present invention, a zipper whose inner layer can be reliably fused to a container body containing PET while maintaining functionality as a zipper tape such as stable sealing properties and an appropriate opening feeling. It is possible to provide a tape and a container with a zipper tape capable of balancing the functions of the container body and the zipper tape by fusing such a zipper tape to the container body.

It is a top view of a bag with a zipper tape concerning a 1st embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II of the bag with a zipper tape shown in FIG. 1. It is sectional drawing of the bag with a zipper tape which concerns on 2nd Embodiment of this invention. It is sectional drawing of another example of the bag with a zipper tape which concerns on 2nd Embodiment of this invention. It is sectional drawing of further another example of the bag with a zipper tape which concerns on 2nd Embodiment of this invention. It is sectional drawing of the bag with a zipper tape which concerns on 3rd Embodiment of this invention. It is sectional drawing of the bag with a zipper tape which concerns on the modification of 3rd Embodiment. It is sectional drawing of the bag with a zipper tape which concerns on 4th Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the specification and the drawings, components having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted.

In addition, in this specification, the main polymer means the largest component among the constituent components of each layer, and when each layer is composed of a polymer of n components (n is an integer of 2 or more), 100 / n% As described above, it means a component containing preferably 100 / n × 1.2 times or more. The main polymer can be analyzed by infrared spectroscopy, NMR, DSC and the like. Note that impurities can be contained within a range not to lose the effects of the present invention.

(First embodiment)
FIG. 1 is a plan view of a bag with a zipper tape according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of the bag with a zipper tape shown in FIG. As shown in FIGS. 1 and 2, the bag 1 with a zipper tape according to the first embodiment includes a film 10 forming a bag having a first surface 11 </ b> A and a second surface 11 </ b> B, and a zipper tape 20. Including.

The film 10 is formed of, for example, a single-layer or multi-layer thermoplastic resin. More specifically, film 10 may include a layer formed of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). The PP may be a homopolypropylene (HPP), a random polypropylene (RPP), or a block polypropylene (BPP). When the film 10 has a multilayer structure, biaxially oriented polypropylene (OPP), biaxially oriented polyethylene terephthalate (OPET), or biaxially oriented nylon (ONy) may be used for the front substrate. Further, the film 10 may include a layer of an inorganic material formed by, for example, aluminum deposition or aluminum foil lamination. In the present embodiment, the sealant layers on the first surface 11A and the second surface 11B of the film 10, that is, the layer facing the zipper tape 20, are formed of a resin composition containing heat-sealable PET (polyethylene terephthalate) as a main polymer. You.

In the present embodiment, the two films 10 are joined to each other at the bottom seal portion 12 and the side seal portion 13 to form a bag having the first surface 11A and the second surface 11B. In the embodiment, the first surface 11A and the second surface 11B may be formed by folding one film 10 at a portion corresponding to the side seal portion 13. Alternatively, a portion where the film 10 is folded inward at a portion corresponding to the bottom seal portion 12 or the side seal portion 13 in the example of FIG. 1, that is, a so-called gusset may be formed. In this case, the gusset may be formed by the film 10 or may be formed by another film bonded to the film 10. Moreover, the bag 1 with a zipper tape may be a standing pouch that can be placed upright by forming a gusset on the bottom.

In the present embodiment, while the bottom seal portion 12 and the side seal portion 13 are formed, the opening portion 14 of the zipper tape-attached bag 1 is formed by not forming the top seal portion. In the embodiment, a top seal portion is formed in addition to the bottom seal portion 12 and the side seal portion 13, and the opening 14 is formed in the bag 1 with the zipper tape afterward by cutting between the top seal portion and the zipper tape 20. It may be possible to form. In still another embodiment, the bag body may be provided in a state where the bottom seal portion 12 is not formed, that is, the bag 1 with the zipper tape is not sealed on the side opposite to the zipper tape 20. In this case, the bottom seal portion 12 is formed after filling the contents into the bag 1 with the zipper tape. In addition, as long as the zipper tape is fused, the present invention can be applied to bags having various known structures and containers other than the bags.

As shown in FIG. 2, the zipper tape 20 includes a first member 20A fused to the first surface 11A of the film 10 and a second member 20B fused to the second surface 11B. Each of the first member 20A and the second member 20B has a polyolefin portion 21A, 21B formed of a resin composition containing polyolefin as a main polymer, adhesive resin layers 22A, 22B, and a resin composition containing polyester as a main polymer. And polyester portions 23A and 23B formed by The polyolefin portions 21A and 21B include base strips 211A and 211B, and engaging portions 212A and 212B that protrude from mutually facing surfaces of the base strips 211A and 211B. On the other hand, the polyester portions 23A and 23B cover the surfaces of the base strips 211A and 211B on the side opposite to the engaging portions 212A and 212B, and the joining surfaces 231A and 231B of the film 10 with the first surface 11A and the second surface 11B. To form The adhesive resin layers 22A and 22B are located between the polyolefin portions 21A and 21B and the polyester portions 23A and 23B, and join these portions to each other. Such a zipper tape 20 is formed, for example, by co-extrusion of the resin of each part.

Here, the adhesive resin layers 22A and 22B are made of, for example, polyethylene, acid-modified polyolefin, epoxy group-containing monomer-ethylene copolymer, copolymer of ethylene- (meth) acrylate and dicarboxylic anhydride monomer, ethylene- It is made of vinyl acetate copolymer, ethylene-isobutyl acrylate copolymer, polyamide resin, thermoplastic polyester, polyvinyl acetate and its copolymer, and adhesive resin such as styrene, polyester and olefin elastomer. . By using these adhesive resins, higher interlayer bonding strength can be obtained between the polyolefin portions 21A and 21B and the polyester portions 23A and 23B. Thereby, for example, when the bag 1 with the zipper tape as shown in FIG. 1 is formed, the gap between the layers of the zipper tape 20 in the side seal portion 13 becomes a pinhole and the scent retention of the bag 1 with the zipper tape Can be prevented from decreasing.

係 合 In the zipper tape 20 as described above, the engaging portions 212A and 212B formed by the polyolefin portions 21A and 21B can engage with each other. In the example shown in FIG. 2, the engaging portion 212A has a male cross-sectional shape, the engaging portion 212B has a female cross-sectional shape, and these engaging portions 212A and 212B engage with each other. Thereby, the zipper tape 20 is closed, and the opening 14 of the bag 1 with the zipper tape is sealed. The shapes of the engaging portions of various known zipper tapes, which are not limited to the male type and the female type, and are formed by combining claws, hooks, or knobs, are applied to the engaging portions 212A and 212B in the above example. It is also possible. Two or more sets of engaging portions may be provided on a pair of polyolefin portions. In any case, the engaging portions 212A and 212B are irregular portions protruding from the base strips 211A and 211B having a substantially rectangular cross section. By maintaining the shape of such a deformed portion, the opening 14 is reliably sealed when the engaging portions 212A and 212B are engaged, and a proper opening feeling is exhibited when the engagement is released. For this purpose, it is advantageous to form the engaging portions 212A and 212B in the polyolefin portions 21A and 21B whose main polymer is polyolefin.

On the other hand, when the sealant layers on the first surface 11A and the second surface 11B of the film 10 are formed of a resin composition having heat-sealable PET as a main polymer as in the present embodiment, polyolefin and heat-sealable PET are used. Therefore, it is not easy to directly fuse the polyolefin portions 21A and 21B forming the engaging portions 212A and 212B to the first surface 11A and the second surface 11B. Therefore, in the present embodiment, the surfaces of the polyolefin portions 21A and 21B opposite to the engaging portions 212A and 212B are covered with the polyester portions 23A and 23B, and the joining surfaces 231A and 231B formed on the polyester portions 23A and 23B are respectively formed. The film 10 is fused to the first surface 11A and the second surface 11B. Since the fusion property between the polyester and the heat-sealable PET is high, the polyester portions 23A and 23B can be stably fused to the first surface 11A and the second surface 11B. The polyolefin portions 21A, B and the polyester portions 23A, 23B may be joined in any manner, but in the present embodiment, the polyolefin portions 21A, B and the polyester portions 23A, 23B are formed using the adhesive resin layers 22A, 22B. And has joined.

According to the first embodiment of the present invention as described above, since the engaging portions 212A and 212B of the zipper tape 20 are formed of a resin composition containing polyolefin as a main polymer, stable sealing performance is achieved. And a moderate opening feeling while maintaining the function as a zipper tape, while the joining surface 231A, 231B is formed of a resin composition containing polyester as a main polymer, so that the sealant layer contains PET. The zipper tape 20 can be securely fused to the first surface 11A and the second surface 11B of the ten.

(Second embodiment)
FIG. 3 is a cross-sectional view of a bag with a zipper tape according to a second embodiment of the present invention. As shown in FIG. 3, the bag 2 with a zipper tape according to the second embodiment includes a film 10 and a zipper tape 40. Note that the configuration of the film 10 is the same as that of the first embodiment described above, and a duplicate description will be omitted below.

As shown in FIG. 3, the zipper tape 40 includes a first member 40A fused to the first surface 11A of the film 10 and a second member 40B fused to the second surface 11B. Each of the first member 40A and the second member 40B includes polyolefin portions 21A and 21B, adhesive resin layers 42A and 42B, and polyester portions 43A and 43B. Note that the base strips 211A and 211B and the engaging portions 212A and 212B of the polyolefin portions 21A and 21B are the same as those in the first embodiment, and a duplicate description will be omitted.

The polyester portions 43A and 43B are formed of a resin composition containing polyester as a main polymer, as in the first embodiment, and cover the surfaces of the base strips 211A and 211B on the side opposite to the engaging portions 212A and 212B, The joining surfaces 231A and 231B are formed. In addition, in this embodiment, the polyester portions 43A and 43B include rising portions 432A and 432B that cover the end surfaces 213A and 213B of the base strips 211A and 211B in the width direction of the zipper tape 40 (vertical direction in FIG. 3). Here, the rising portions 432A and 432B are portions where both ends in the width direction rise in the cross-sectional shape of the polyester portions 43A and 43B. In the illustrated example, the rising portions 432A and 432B cover the entire end surfaces 213A and 213B, but the rising portions 432A and 432B are a part of the end surfaces 213A and 213B, specifically, the side closer to the polyester portions 43A and 43B. May be covered.

The adhesive resin layers 42A and 42B are made of, for example, polyethylene, acid-modified polyolefin, epoxy group-containing monomer-ethylene copolymer, copolymer of ethylene- (meth) acrylate and dicarboxylic anhydride monomer, as in the first embodiment. Formed from polymers, ethylene-vinyl acetate copolymers, ethylene-isobutyl acrylate copolymers, polyamide resins, thermoplastic polyesters, polyvinyl acetates and their copolymers, styrene-based, polyester-based, olefin-based elastomers, etc. However, not only the surfaces of the base strips 211A and 211B on the side opposite to the engaging portions 212A and 212B but also the end surfaces 213A and 213B are formed and formed between the polyester strips 43A and 43B.

In the present embodiment, in addition to obtaining the same effects as those of the first embodiment, the polyester portions 43A and 43B cover the end faces 213A and 213B in the width direction of the base strips 211A and 211B. Preventing the formation of pinholes in the side seal portion 13 (see FIG. 1) where the first member 40A and the second member 40B of the zipper tape 40 are joined together with the first surface 11A and the second surface 11B of the film 10. Can be.

More specifically, for example, when the side seal portion 13 is formed by fusion, the resin of the polyolefin portions 21A and 21B melts and the end faces 213A and 213B of the base strips 211A and 211B protrude from the polyester portion, and When the resin comes into contact with the resin of the sealant layer on the first surface 11A or the second surface 11B, there is a possibility that a pinhole is formed without being fused at that portion. In the present embodiment, the end faces 213A, 213B of the base strips 211A, 211B are covered with the rising portions 432A, 432B of the polyester portions 43A, 43B, so that the resin of the polyolefin portions 21A, 21B and the first surface 11A or the second surface 11B. The formation of pinholes due to the contact of the sealant layer with the resin can be prevented. It should be noted that, if the polyester portions 43A and 43B have a shape capable of covering the end surfaces of the base strips 211A and 211B, the shape is not limited to the shape called the rising portions 432A and 432B. The effect is obtained.

FIG. 4 is a cross-sectional view of another example of the zipper tape-attached bag according to the second embodiment of the present invention. In the bag 2A with a zipper tape shown in FIG. 4, the width of the zipper tape 40 is substantially the same as the example shown in FIG. 3, but the base strips 411A and 411B are formed to be narrow in the polyolefin portions 41A and 41B. ing. The width of the base strips 411A, 411B may be the same as or narrower than the engaging portions 212A, 212B, for example, as in the illustrated example. As a result, in the illustrated example, the polyester portions 43A and 43B form slab-shaped portions 433A and 433B that extend outward in the width direction from the end surfaces 213A and 213B of the base strips 411A and 411B.

In the illustrated example, the slab-shaped parts 433A and 433B cover the end faces 213A and 213B of the base strips 411A and 411B, but in other examples, the slab-shaped parts 433A and 433B are part of the end faces 213A and 213B. Specifically, only the side close to the polyester portions 43A, 43B may be covered, or the slab-shaped portions 433A, 433B may not cover the end faces 213A, 213B. In this case, a step is formed between the base strips 411A and 411B and the slab-shaped portions 433A and 433B on the inner surfaces of the zipper tape 40 facing the first member 40A and the second member 40B.

FIG. 5 is a cross-sectional view of still another example of the bag with the zipper tape according to the second embodiment of the present invention. In the bag 2B with zipper tape shown in FIG. 5, the zipper tape 40 includes two sets of polyolefin portions formed of a resin composition containing polyolefin as a main polymer, that is, polyolefin portions 41A and 41B and polyolefin portions 44A and 44B. The polyolefin portions 44A, 44B are also configured similarly to the polyolefin portions 41A, 41B, and have narrow base strips 441A, 441B, and engaging portions 442A, 442B configured similarly to the above-described engaging portions 212A, 212B. including. In the illustrated example, a so-called double zipper is configured by arranging the polyolefin portions 41A and 41B and the polyolefin portions 44A and 44B in parallel in the width direction of the zipper tape 40.

In the illustrated example, since the base strips 411A, 411B, 441A, 441B of the polyolefin portions 41A, 41B, 44A, 44B are narrow, the polyester portions 43A, 43B are formed of the zipper tape 40 similarly to the example of FIG. In addition to forming the slab-shaped portions 433A and 433B at both ends in the width direction, the slab-shaped portions are respectively provided between the base strip 411A and the base strip 441A and between the base strip 411B and the base strip 441B. 434A and 434B are formed. In this specification, the slab-shaped portions (the slab-shaped portions 433A and 433B and the slab-shaped portions 434A and 434B) are formed by joining the polyester portions 43A and 43B to the polyolefin portion when the zipper tape 40 is viewed in the thickness direction. The zipper tape 40 is a portion formed by the slab (single plate) -shaped polyester portions 43A and 43B in this portion.

In the example described above with reference to FIGS. 4 and 5, the base strips of the polyolefin portions 41A, 41B, 44A, and 44B are formed to have a narrow width, and the zipper tape 40 is arranged in parallel at both ends in the width direction and in the width direction. The slab- like portions 433A, 433B, 434A, and 434B formed by the polyester portions 43A and 43B are provided between the plurality of polyolefin portions, so that the polyolefin portions 41A, 41B, 44A, and 44B are bonded to the polyester portions 43A and 43B. The bonding area can be minimized, and the deformation of the zipper tape 40 due to the occurrence of warpage or the like at the bonded portion can be suppressed.

Note that a double zipper such as the example described above with reference to FIG. 5 can be employed in other examples. For example, in the example shown in FIG. 4, a double zipper may be formed by projecting two engagement portions 212A and 212B from surfaces of base strips 411A and 411B that face each other. In addition, in the example shown in FIGS. 2 and 3, a double zipper may be formed by projecting two engagement portions 212A and 212B from surfaces of the base strips 211A and 211B facing each other. In other embodiments and modified examples described later, a double zipper can be formed by projecting two engagement portions from surfaces of the base strip facing each other. Alternatively, three or more engaging portions may protrude from the mutually opposing surfaces of the base strip.

(Third embodiment)
FIG. 6 is a sectional view of a bag with a zipper tape according to a third embodiment of the present invention. As shown in FIG. 6, the bag 3 with a zipper tape according to the third embodiment includes a film 10 and a zipper tape 60. Note that the configuration of the film 10 is the same as that of the first embodiment described above, and a duplicate description will be omitted below.

The zipper tape 60 includes, as shown in FIG. 6, a first member 60A fused to the first surface 11A of the film 10 and a second member 60B fused to the second surface 11B. Each of the first member 60A and the second member 60B includes polyolefin portions 61A and 61B, adhesive resin layers 62A and 62B, and polyester portions 63A and 63B.

The polyolefin portions 61A and 61B are formed of a resin composition containing polyolefin as a main polymer similarly to the first embodiment, and project from the opposing surfaces of the base strips 611A and 611B and the base strips 611A and 611B, respectively. Engaging portions 212A and 212B. Note that the engagement portions 212A and 212B are the same as those in the first embodiment described above, and thus redundant description will be omitted. The base strips 611A and 611B have a surface on the side of the engaging portions 212A and 212B and a surface on the opposite side, as in the first embodiment. In addition, in the present embodiment, at both ends of the base strips 611A and 611B in the width direction of the zipper tape 60 (vertical direction in FIG. 6), the shapes corresponding to the return portions 633A and 633B of the polyester portions 43A and 43B described later. Step portions 614A and 614B are formed. In the present embodiment, the step portions 614A and 614B are a part of the surfaces of the base strips 611A and 611B on the engaging portions 212A and 212B side.

The polyester portions 63A and 63B are formed of a resin composition containing polyester as a main polymer similarly to the second embodiment, and cover the surfaces of the base strips 611A and 611B on the side opposite to the engaging portions 212A and 212B, The joining surfaces 231A and 231B are formed. In addition, the polyester portions 63A and 63B include rising portions 432A and 432B that cover the end surfaces 213A and 213B of the base strips 611A and 611B in the width direction of the zipper tape 60. Further, in the present embodiment, the polyester portions 63A and 63B include return portions 633A and 633B that cover the steps 614A and 614B of the base strips 611A and 611B. Here, the return portions 633A and 633B are bent so that the respective ends of the rising portions 432A and 432B whose both ends in the width direction rise in the cross-sectional shape of the polyester portions 63A and 63B return toward the inside in the width direction. Part. As described above, in the present embodiment, the steps 614A and 614B are a part of the surface of the base strips 611A and 611B on the side of the engaging portions 212A and 212B. Accordingly, the return portions 633A and 633B partially cover the surfaces of the base strips 611A and 611B on the engagement portions 212A and 212B side. In another example, the base strip may have a substantially rectangular cross section where no step is formed, and the return portions 633A and 633B may partially cover the flat surface of the base strip on the engaging portion side. .

The adhesive resin layers 62A and 62B are made of, for example, polyethylene, acid-modified polyolefin, epoxy group-containing monomer-ethylene copolymer, copolymer of ethylene- (meth) acrylate and dicarboxylic anhydride monomer, as in the first embodiment. Formed from polymers, ethylene-vinyl acetate copolymers, ethylene-isobutyl acrylate copolymers, polyamide resins, thermoplastic polyesters, polyvinyl acetates and their copolymers, styrene-based, polyester-based, olefin-based elastomers, etc. However, not only the surfaces of the base strips 611A and 611B on the side opposite to the engaging portions 212A and 212B, but also the end surfaces 213A and 213B and the step portions 614A and 614B are wrapped around the polyester portions 63A and 63B. Formed between them.

In the present embodiment, in addition to obtaining the same effect as the above-described second embodiment, the polyester portions 63A, 63B are provided in addition to the end faces 213A, 213B in the width direction of the base strips 611A, 611B, and the engaging portions are formed. By covering a part of the surface on the 212A, 212B side, the first member 60A and the second member 60B of the zipper tape 60 are joined together with the first surface 11A and the second surface 11B of the film 10. 13 (see FIG. 1) can be more reliably prevented from forming pinholes. More specifically, for example, when the side seal portion 13 is formed by fusion, the resin of the polyolefin portions 61A and 61B melts and crosses over the rising portions 432A and 432B to form the first surface 11A or the second surface 11B. When it comes into contact with the resin of the sealant layer, pinholes may be formed due to low fusion between the resins. In the present embodiment, the polyester portions 63A and 63B cover the surfaces of the base strips 611A and 611B on the engagement portions 212A and 212B side with the return portions 633A and 633B, so that the resin of the polyolefin portions 61A and 61B and the first surface are covered. The formation of pinholes due to the contact of the sealant layer on the first surface 11A or the second surface 11B with the resin can be more reliably prevented. In addition, even if it is not a shape called the return part 633A, 633B, the shape which can partially cover the surface of the base part 211A, 211B on the engaging part 212A, 212B side is similarly the polyester part 63A, When formed in 63B, the same effect can be obtained.

(Modification)
FIG. 7 is a cross-sectional view of a bag with a zipper tape according to a modification of the third embodiment. In the bag 3A with a zipper tape shown in FIG. 7, the return portions 633A and 633B of the polyester portions 63A and 63B are extended and reach the roots of the engagement portions 212A and 212B. Also in this case, since the roots of the engagement portions 212A and 212B are not covered with the return portions 633A and 633B, the polyester portions 63A and 63B partially cover the surfaces of the base strips 211A and 211B on the engagement portions 212A and 212B side. Covering is the same as in the example described above with reference to FIG. However, in the example of FIG. 7, the step portions 614A and 614B are not formed.

In the second and third embodiments described above, it is possible to prevent the formation of pinholes when the side seal portions 13 are formed in the bags 2 and 3 with zipper tape. When the inner layer of the film 10 is formed of a resin composition containing PET, the bag with the zipper tape has excellent scent retention, but the scent retention can be further improved by preventing the formation of pinholes. . Note that even if there is no structure for preventing the formation of pinholes as in the first embodiment, a remarkable pinhole may not be formed depending on the material and dimensions of the polyolefin portions 21A and 21B. Depending on the performance required of the attached bag 1, the formation of the pinhole may be of an acceptable level. For the same reason, the second and third embodiments can be appropriately selected according to the necessity of preventing the formation of the pinhole and the degree thereof.

FIG. 8 is a sectional view of a bag with a zipper tape according to the fourth embodiment of the present invention. In the bag 4 with a zipper tape shown in FIG. 8, in the first portions 70A and 70B of the zipper tape 70, the engagement portions of the polyolefin portions 71A and 71B are such that the male member 712A and the female member 712B are in surface contact with each other. An engaging portion is formed. Such a sealing type engaging portion is described in, for example, Japanese Patent Application Laid-Open No. 8-268445. In the present embodiment, the sealing performance and the pressure resistance of the zipper tape-attached bag 4 can be improved by the seal-type engagement portion formed by the male member 712A and the female member 712B of the zipper tape 70. In the example shown in FIG. 8, the polyolefin portions 71A and 71B include the narrow base strips 411A and 411B as in the example described above with reference to FIGS. 4 and 5; It is also possible to combine a sealing engagement with a base strip that is not narrow, as in the example described with reference to FIG.

The bag 1 with the zipper tape according to the first embodiment of the present invention described above with reference to FIG. 2 is described in Example 1, and the bag 2 with the zipper tape according to the second embodiment described with reference to FIG. Example 2 The bag 3 with the zipper tape according to the third embodiment described with reference to FIG. 6 was used as the example 3 and the zipper tape 60 was used as the example 3 using a resin composition containing heat-sealable PET as a main polymer. The heat sealability of the zipper tapes 20, 40, 60 with respect to the formed sealant layer and the presence or absence of pinholes in the side seal portions 13 of the zipper tape-attached bags 1, 2, 3 were evaluated.

In the zipper tapes 20, 40, and 60 of Examples 1 to 3, as the material of the polyolefin portions 21A, 21B, 61A, and 61B, linear low-density polyethylene having a density of 915 kg / m3 and a melt flow rate of 4.0 g / min. And low-density polyethylene, ethylene-propylene rubber, and alicyclic resin as materials for the adhesive resin layers 22A, 22B, 42A, 42B, 62A, and 62B in a ratio of 63:23:14 (unit: wt%). As a material for the adhesive resin and the polyester portions 23A, 23B, 43A, 43B, 63A and 63B, a crystalline polyester (a 6: 4 blend of Toyobo Co., Ltd. Byron SI-173 and GM-913) was prepared. These raw material compositions were extruded by an extruder and then water-cooled to produce zipper tapes 20, 40, and 60.

As a comparative example, the polyester parts 23A and 23B are omitted from the zipper tape 20 of the first embodiment, and a zipper tape composed of the polyolefin parts 21A and 21B and the adhesive resin layers 22A and 22B is obtained by using the same raw material as described above. A bag with a zipper tape was prepared by the composition and the molding method, and bonded to the same film 10 as in the first embodiment.

Table 1 shows the evaluation results of the heat sealability and the presence or absence of pinholes in Examples 1 to 3 and Comparative Example. The evaluation method is as follows.

(1) Heat Sealability Examples 1 to 3 were performed using a laminate film of PET # 12 / heat sealability PET # 20 (total thickness: 32 μm) using a “heat gradient tester” manufactured by Toyo Seiki Seisaku-sho, Ltd. The zipper tape of the comparative example and the laminated film were sealed at a sealing time of 1.0 second, a sealing pressure of 2.0 MPa, and a sealing temperature of 180 ° C. to obtain an evaluation sample. For this evaluation sample, the heat seal strength (N / 15 mm) of the zipper tape and the laminate per 15 mm width was measured using “Digital Force Gauge” manufactured by Imada. In addition, the tension | pulling speed at the time of a seal strength measurement was 300 mm / min. In Table 1, the case where the heat seal strength is 15 (N / 15 mm) or more is indicated as OK, and the case where the heat seal strength is less than 15 (N / 15 mm) is indicated as NG.

(2) Presence or absence of pinholes Alcohol colored with ink was sealed in the bags with zipper tapes of Examples 1 to 3 and Comparative Example, and the presence or absence of pinholes in the side seal portion 13 was evaluated. In Table 1, the case where the colored alcohol did not leak from the side seal portion was shown as OK, and the case where the colored alcohol leaked from the side seal portion was shown as NG.

The Examples and Comparative Examples described above show that in each embodiment of the present invention, the heat sealability of the zipper tape with respect to the sealant layer formed of the resin composition containing heat-sealable PET as the main polymer is improved. Was done. Further, although the degree of improvement in the pinholes of the side seal portions in the first embodiment was smaller than that in the second and third embodiments, the necessity of preventing the formation of the pinholes and the degree thereof were determined as described above. It is also possible to select the first embodiment.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is apparent that those skilled in the art to which the present invention pertains can conceive various changes or modifications within the scope of the technical idea described in the claims. It is understood that the present invention naturally belongs to the technical scope of the present invention.

1, 2, 3 ... bag with zipper tape, 10 ... film, 11A ... 1st surface, 11B ... 2nd surface, 12 ... bottom seal portion, 13 ... side seal portion, 14 ... opening, 20, 40, 60 ... Zipper tape, 20A, 40A, 60A: first member, 20B, 40B, 60B: second member, 21A, 21B, 61A, 61B: polyolefin portion, 211A, 211B, 611A, 611B: base strip, 212A, 212B ... Engaging portion, 22A, 22B, 42A, 42B, 62A, 62B ... adhesive resin layer, 23A, 23B, 43A, 43B, 63A, 63B ... polyester portion, 231A, 231B ... joining surface.

Claims (10)

1. A first resin formed of a resin composition containing polyolefin as a main polymer, the first resin including: a pair of base strips; and an engaging portion projecting from mutually facing surfaces of the pair of base strips and capable of engaging with each other. Part and
   A second resin portion formed of a resin composition containing polyester as a main polymer, the second resin portion covering at least a surface of the pair of base strips opposite to the engaging portion.
2. The zipper tape according to claim 1, further comprising an adhesive resin layer located between the first resin portion and the second resin portion.
3. 3. The zipper tape according to claim 1, wherein the second resin portion further at least partially covers an end surface of the base strip in a width direction of the zipper tape. 4.
4. 4. The zipper according to claim 3, wherein the second resin portion further partially covers a surface of the base strip on the engaging portion side that follows an end face of the base strip in the width direction of the zipper tape. 5. tape.
5. The second resin portion according to any one of claims 1 to 4, wherein the second resin portion forms a slab-shaped portion that extends outward in the width direction from an end surface of the base strip in the width direction of the zipper tape. Zipper tape as described.
6. The first resin portion includes a plurality of resin portions arranged in parallel in the width direction of the zipper tape,
   The zipper tape according to any one of claims 1 to 5, wherein the second resin portion forms a slab-like portion between the plurality of resin portions.
7. The zipper tape according to any one of claims 1 to 6, wherein the engaging portion includes a sealing type engaging portion in which the male member and the female member are in surface contact with each other.
8. A zipper tape according to any one of claims 1 to 7,
   And a container body to which the zipper tape is fused.
9. The container with a zipper tape according to claim 8, wherein the layer of the container body facing the zipper tape is formed of a resin composition containing heat-sealable PET as a main polymer.
10. The container with a zipper tape according to claim 8 or 9, wherein the container body forms a bag.

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