WO2019244725A1

WO2019244725A1 - Zipper tape

Info

Publication number: WO2019244725A1
Application number: PCT/JP2019/023158
Authority: WO
Inventors: 厚地　善行; 謙太鈴木; 梓大澤; 明良村上; 晃大山本
Original assignee: 共同印刷株式会社; ハイパック株式会社
Priority date: 2018-06-22
Filing date: 2019-06-11
Publication date: 2019-12-26
Also published as: JP7145658B2; JP2019217188A

Abstract

A zipper tape of the present invention comprises a band-shaped male member 10 and female member 20 that can be fitted with each other. The male member 10 and the female member 20 are configured from a resin composition. The resin composition when formed into a film of 100 μm has a tensile modulus of elasticity of more than or equal to 400 MPa. The male member 10 is provided with a root portion 12, and a first male hook portion 14a and a second male hook portion 14b which are arranged at a distal end of the root portion 12. In a cross section perpendicular to the longitudinal direction of the male member 10, the angle between the root portion 12 and the first male hook portion 14a and the angle between the root portion 12 and the second male hook portion 14b are both obtuse angles.

Description

Chuck tape

The present invention relates to a chuck tape.

Conventionally, as a component of a packaging container for packaging foods, medicines, and the like, a zipper tape composed of a male and female strip-shaped member that can be fitted to each other has been widely used. Such a zipper tape is required to have properties such as opening strength and airtightness. In order to satisfy such demands, various chuck tapes have been proposed.

In Patent Document 1, in a pair of plastic chucks in which a male claw and a female claw are engaged, a female claw constituted by two claws of an opening side female hook portion and a content side female hook portion is provided on a flange. The plastic chuck is characterized in that when an opening force is applied from the opening side of the plastic chuck, a portion of the flange sandwiched between the bases of the female claws is bendable. Patent Document 1 discloses that the plastic chuck is made of polyethylene.

JP 2000-262307 A

When the zipper tape of Patent Document 1 is manufactured using a resin having low rigidity such as polyethylene, good performance such as good opening strength and tightness can be obtained.

However, depending on the use of the packaging bag using the zipper tape, it may be required to provide the zipper tape itself with various functions such as non-adsorption. In such a case, it may be necessary to use a resin having high rigidity as a resin constituting the chuck tape. In this case, even if the shape of the zipper tape described in Patent Literature 1 assuming use of polyethylene is applied, a desired opening strength may not be obtained.

Therefore, there is a need to provide a zipper tape made of a highly rigid resin and having good opening strength.

Means for Solving the Problems The present inventors have conducted intensive studies and found that the above-mentioned problems can be solved by the following means, and completed the present invention. That is, the present invention is as follows:
<Aspect 1> A zipper tape comprising a strip-shaped male member and female member that can be fitted to each other,
The male member and the female member are formed of a resin composition, a tensile modulus when the resin composition is formed into a 100 μm film is 400 MPa or more, and the male member has a root portion, and It has a first male hook and a second male hook located at the tip of the root,
In a cross section perpendicular to the longitudinal direction of the male member, the angle between the root and the first male hook and the angle between the root and the second male hook are both obtuse.
Chuck tape.
<Aspect 2> The chuck tape according to aspect 1, wherein in the cross section, an angle between the root and the first male hook is larger than an angle between the root and the second male hook.
<Aspect 3> The chuck tape according to aspect 1 or 2, wherein, in the cross section, a projection width of the first male hook from the root is smaller than a projection width of the second male hook from the root.
<Aspect 4> The chuck tape according to any one of aspects 1 to 3, wherein the resin composition contains an ethylene-vinyl alcohol copolymer and an acid-modified polyolefin-based resin.
<Aspect 5> The chuck tape according to aspect 4, wherein the resin composition contains 65 to 95% by mass of an ethylene-vinyl alcohol copolymer and 5 to 35% by mass of an acid-modified polyolefin-based resin.
<Embodiment 6> The content of the ethylene monomer in the ethylene-vinyl alcohol copolymer in the resin composition is the total mole of the ethylene monomer and the vinyl alcohol monomer in the entire ethylene-vinyl alcohol copolymer. The zipper tape according to aspect 4 or 5, which is 10 to 70 mol% based on the number.
<Aspect 7> Any of aspects 1 to 6, wherein the resin composition has a melt mass flow rate in accordance with JIS K7210-1 of 0.4 g / 10 min or more at a temperature of 190 ° C. and a load of 21.18 N. A chuck tape according to any one of claims 1 to 7.
<Embodiment 8> A packaging bag comprising a packaging bag film having a non-adsorbing layer containing an ethylene-vinyl alcohol copolymer as an innermost layer, and wherein the male member and the female member are 8. The zipper tape according to any one of aspects 1 to 7, wherein the zipper tapes are opposed to each other and are fused to the non-adsorptive layer such that the first male hook portion is located on the opening side. Has a packaging bag with zipper tape.
<Aspect 9> The zipper tape according to any one of aspects 1 to 7,
A method for producing a packaging bag with a zipper tape using a packaging bag film having a non-adsorbent layer containing an ethylene-vinyl alcohol copolymer,
Fusing the male member and the female member of the chuck tape to the non-adsorptive layer, respectively; and the male member and the female member of the chuck tape face each other, and the first male hook is open. So that the ends of the non-adsorptive layer face each other and are fused to form a bag,
When the ends of the non-adsorptive layer are made to face each other and fused to form a bag, at least a part of the chuck tape is placed between the ends of the non-adsorptive layers facing each other. Fused and crushed integrally with the end of the non-adsorbent layer,
Manufacturing method of packaging bag with zipper tape.

According to the present invention, it is possible to provide a zipper tape made of a resin having high rigidity and having a good opening strength.

FIG. 1 is a view showing one embodiment of the chuck tape of the present invention. FIG. 2 is a view showing a conventional chuck tape. FIG. 3 is a diagram showing one embodiment of the packaging bag with the zipper tape of the present invention. FIG. 4 is a diagram showing each step of one embodiment of the method of the present invention for producing a packaging bag with a zipper tape.

《Chuck tape》
As shown in FIG. 1, the zipper tape of the present invention is a zipper tape comprising a strip-shaped male member 10 and female member 20 that can be fitted to each other,
The male member 10 and the female member 20 are made of a resin composition, the tensile elastic modulus when the resin composition is formed into a 100 μm film is 400 MPa or more, and the male member 10 has a root portion 12 and a root portion. 12 comprises a first male hook 14a and a second male hook 14b arranged at the tip of 12,
In the cross section perpendicular to the longitudinal direction of the male member 10, the angle between the root 12 and the first male hook 14a and the angle between the root 12 and the second male hook 14b are both obtuse.

Conventional zipper tapes are designed using a resin having low rigidity such as polyethylene so that the angle between the root 12 ′ and the second male hook 14b ′ is an acute angle as shown in FIG. . In such a structure, the interaction between the elasticity of the resin and the fitting property of the second male hook portion 14b 'has provided good opening strength while maintaining good hermeticity.

However, when a chuck tape having the shape shown in FIG. 2 was produced using the resin composition having a tensile modulus of 400 MPa or more, the sealing strength was maintained, but the opening strength was not good.

On the other hand, the shape of the male member shown in FIG. 1, that is, the angle between the root 12 and the first male hook 14a and the angle between the root 12 and the second male hook 14b are both obtuse. In terms of shape, conventionally, it has been considered that the male member and the female member cannot be sufficiently fitted, and as a result, the opening strength is extremely weak. However, the present inventors unexpectedly found that when the resin composition having the above tensile elastic modulus of 400 MPa or more was used, good opening strength was obtained by using the male member shown in FIG. 1. Was found.

Hereinafter, the shapes of the male member and the female member of the chuck tape of the present invention will be described.

<Male members>
The male member is a belt-shaped member that can be fitted with the female member. The male member has a root and a first male hook and a second male hook disposed at the tip of the root. Hereinafter, the specific shape of the male member will be described with reference to FIG.

In the cross section perpendicular to the longitudinal direction of the male member 10, the angle α between the root 12 and the first male hook 14a and the angle β between the root 12 and the second male hook 14b are both obtuse. . This makes it possible to obtain a zipper tape having good opening strength when the resin composition having the above tensile elastic modulus of 400 MPa or more is used. In the present invention, the term “obtuse angle” means an angle of more than 90 ° and 180 ° or less.

In the above cross section, when the angle α is larger than the angle β, it is easy to open from the first male hook portion 14a side, but it is difficult to open from the second male hook portion 14b side. Become. When the packaging bag is formed using the zipper tape, the appropriate opening strength from the opening side means that the opening strength is good. Further, a high opening strength from the non-opening side (content side) means that the sealing property is good. Therefore, in the packaging bag, when the first male hook portion 14a is arranged on the opening side and the second male hook portion 14b is arranged on the non-opening side, good opening strength and airtightness can be achieved at the same time. .

角 The angle α is preferably 155 ° or more, 160 ° or more, or 165 ° or more, and 180 ° or less, 175 ° or less, or 170 ° or less, from the viewpoint of obtaining a good opening strength.

The angle β is more than 90 °, 95 ° or more, 100 ° or more, 105 ° or more, 110 ° or more, 115 ° or more, 120 ° or more, 125 ° or more, 130 ° or more, 135 ° or more, 140 ° or more, Or 145 ° or more, and 160 ° or less, or 155 ° or less, from the viewpoint of obtaining good airtightness.

The angle α may be larger than the angle β by 10 ° or more, 15 ° or more, 20 ° or more, 25 ° or more, 30 ° or more, 40 ° or more, 50 ° or more, or 60 ° or more. .

Also, in the section perpendicular to the longitudinal direction of the male member, when the projection width A of the first male hook 14a from the root 12 is smaller than the projection width B of the second male hook 14b from the root 12, It becomes easier to open from the first male hook portion 14a side, but hard to open from the second male hook portion 14b side. Similarly to the above, when the packaging bag is formed using the zipper tape, the appropriate opening strength from the opening side means that the opening strength is good. Further, a high opening strength from the non-opening side (content side) means that the sealing property is good. Therefore, in the packaging bag, when the first male hook portion 14a is arranged on the opening side and the second male hook portion 14b is arranged on the non-opening side, good opening strength and airtightness can be achieved at the same time. .

The above-mentioned protrusion width A may be, for example, 0 mm or more, 0.03 mm or more, or 0.05 mm or more, and may be 0.12 mm or less, 0.10 mm or less, or 0.08 mm or less.

The above-mentioned protrusion width B may be, for example, 0.05 mm or more, 0.08 mm or more, or 0.10 mm or more, and may be 0.20 mm or less, 0.18 mm or less, or 0.15 mm or less.

The protrusion width A may be smaller than the protrusion width B by 0.01 mm or more, 0.02 mm or more, 0.03 mm or more, 0.05 mm or more, or 0.07 mm or more.

The male member 10 may further include an optional flange portion 16 that is continuous with the root portion 12. Through the flange portion, another member, for example, a film for a packaging bag and a male member can be joined, particularly fused.

<Female member>
The female member is a belt-shaped member that can be fitted with the male member. The female member may include a first female hook and a second female hook.

The first female hook and the second female hook may be fittable with the first male hook and the second male hook, respectively.

The female member may further include an optional flange portion continuous with the first female hook portion and the second female hook portion. Through the flange portion, another member, for example, a packaging bag film and the female member can be joined, particularly fused.

Next, the resin composition forming the male member and the female member of the chuck tape of the present invention will be described.

<Resin composition>
The resin composition constituting the male member and the female member is a resin composition having a tensile modulus of elasticity of 400 MPa or more when formed into a 100 μm film. This tensile elasticity modulus may be 400 MPa or more, 450 MPa or more, 500 MPa or more, 550 MPa or more, 600 MPa or more, 650 MPa or more, 700 MPa or more, or 750 MPa or more, and 1500 MPa or less, 1400 MPa or less, 1300 MPa or less, 1200 MPa or less, 1100 MPa or less. , 1000 MPa or less, or 900 MPa or less.

The resin composition is not particularly limited, but may contain an ethylene-vinyl alcohol copolymer (EVOH) and an acid-modified polyolefin-based resin. According to this resin composition, in particular, the zipper tape can be fused with sufficient strength to a packaging bag having a layer containing an ethylene-vinyl alcohol copolymer as the innermost layer, and an aroma component For example, the chuck tape can be made non-sucking.

The content of EVOH can be 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 82% by mass or more, and 95% by mass or less, 93% by mass or less. % Or less, or 90% by weight or less. The content is 65% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, or 82% by mass or more, and 90% by mass or less. This is preferable from the viewpoint of achieving both good heat seal strength and good non-adsorption property.

The content of the acid-modified polyolefin-based resin can be 5% by mass or more, 7% by mass or more, or 10% by mass or more, and is 40% by mass or less, 35% by mass or less, 30% by mass or less, 25% by mass or less. Hereinafter, it can be 20% by mass or less, or 18% by mass or less. This content is 10% by mass or more, and 35% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, or 18% by mass or less. This is preferable from the viewpoint of achieving both good heat seal strength and good non-adsorption property. Further, by setting the content to the above range, appropriate flexibility can be imparted to the resin composition, and favorable opening strength can be obtained when molded into a zipper tape.

When a resin composition has a melt mass flow rate in accordance with JIS K7210-1 of 0.4 g / 10 min or more under the conditions of a temperature of 190 ° C. and a load of 21.18 N, it is necessary to manufacture a packaging bag with a zipper tape. At least a part of the zipper tape is integrated with the innermost layer of the packaging bag facing each other, particularly the end of the innermost layer of the packaging bag between the ends of the non-adsorbent layer of the non-adsorbent packaging bag. It can be fused and crushed, and as a result, it is preferable from the viewpoint of improving the sealing property of the packaging bag. This melt mass flow rate may be not less than 0.4 g / 10 min, not less than 0.5 g / 10 min, or not less than 0.6 g / 10 min, and not more than 4.5 g / 10 min, not more than 4 g / 10 min, not more than 3 g / 10 min, It can be not more than 2.5 g / 10 min, not more than 2 g / 10 min, not more than 1.5 g / 10 min, or not more than 1 g / 10 min.

This MFR may be directly measured for the mass of the extrudate extruded for 10 minutes according to JIS K7210-1 method A, or extruded for 10 minutes according to method B. The volume of the extrudate may be measured, and the mass of the extrudate may be calculated using the density of the extrudate.

(Ethylene-vinyl alcohol copolymer (EVOH))
EVOH can generally be obtained by saponifying an ethylene-vinyl ester copolymer. EVOH can provide the chuck tape with a non-adsorbing property for a fragrance component.

The content of the ethylene monomer in the EVOH is 10 mol% or more, 15 mol% or more, 20 mol% or more, 25 mol% or more, 30 mol, based on the total number of moles of the ethylene monomer and the vinyl alcohol monomer in the entire EVOH. % Or more, or 35 mol% or more, and 70 mol% or less, 60 mol% or less, or 55 mol% or less, 50 mol% or less, or 45 mol% or less.

EVOH can generally be obtained by saponifying an ethylene-vinyl ester copolymer. In this case, the saponification degree of the vinyl ester unit of EVOH may be 90 mol% or more, 95 mol% or more, 99 mol% or more, or 100 mol%. When the saponification degree is high, crystallization is easy, the gas barrier property is enhanced, and the thermal stability at the time of melting is also improved. Therefore, in general, the higher the degree of saponification, the better.

Examples of vinyl esters include vinyl acetate as a typical example, and vinyl esters such as vinyl propionate, vinyl pivalate, vinyl valerate, vinyl caprate, and vinyl benzoate. These vinyl esters may be used alone or in combination of two or more.

As the EVOH, a mixture of EVOHs different in at least one of the ethylene content, the degree of saponification, and the degree of polymerization may be used. EVOH may contain other copolymer components as long as the object of the present invention is not hindered. A plurality of these EVOHs may be used in combination.

(Acid-modified polyolefin resin)
The acid-modified polyolefin-based resin can be obtained by graft-polymerizing an acid to a polyolefin. The acid-modified polyolefin-based resin can provide the chuck tape with adhesiveness to the packaging bag. As the acid-modified polyolefin resin, for example, maleic anhydride-modified polyolefin or the like is used.

Polyolefins include polyethylene {low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ultra-low-density polyethylene (ULDPE), medium-density polyethylene, high-density polyethylene (HDPE)}, and polypropylene-polypropylene (PP) homopolymer. (Homo PP), random polypropylene (random PP), block polypropylene (block PP)} are preferably used.

The acid-modified polyolefin-based resin may be used in combination of two or more.

For example, as the maleic anhydride-modified polyolefin, based on 100 parts by mass of polyolefin, maleic anhydride is 0.05 parts by mass or more, 0.1 parts by mass or more, 0.3 parts by mass or more, 0.5 parts by mass or more, Alternatively, a polymer obtained by graft polymerization of 1.0 part by mass or more, 50 parts by mass or less, 30 parts by mass or less, 20 parts by mass or less, 10 parts by mass or less, or 5.0 parts by mass or less can be used. Examples of such a maleic anhydride-modified polyolefin include those described in JP-A-9-278956.

《Packaging bag with zipper tape》
As shown in FIG. 3, a packaging bag 300 with a zipper tape includes a non-adsorbent layer 200 containing an ethylene-vinyl alcohol copolymer as an innermost layer, a packaging bag, a male member 10 and a female member. It has the above-mentioned chuck tape in which the members 20 are opposed to each other, and the first male hook portions 14a are fused to the non-adhesive layer 200 such that they are located on the opening side.

The packaging bag with the zipper tape having the above configuration can achieve both the non-adsorption property of the zipper tape and the non-adsorption property of the packaging bag particularly when the zipper tape contains EVOH and an acid-modified polyolefin-based resin. Therefore, good non-adsorptivity can be obtained as a whole packaging bag.

<Packaging bag>
The packaging bag may have a non-adsorptive layer containing an ethylene-vinyl alcohol copolymer as the innermost layer.

This packaging bag may be composed of a packaging bag film having at least a non-adsorbent layer. This packaging bag film may further include an optional base layer.

(Non-adsorptive layer)
The non-adsorptive layer may contain an ethylene-vinyl alcohol copolymer. As the ethylene-vinyl alcohol copolymer, those described for the chuck tape can be used.

In addition, it is preferable that the non-adsorptive layer further contains an acid-modified polyolefin-based resin from the viewpoint of further improving the adhesiveness with the chuck tape. As the acid-modified polyolefin-based resin, those described for the chuck tape can be used.

(Base material layer)
The base material layer may be laminated on the non-adsorptive layer in the packaging bag film. It is preferable that this base material layer can provide the non-adsorptive layer with an appropriate stiffness and a barrier property for preventing intrusion of moisture and oxygen from the outside.

Examples of such a base layer include polyolefin, polyvinyl chloride, polyvinylidene chloride, polychlorotrifluoroethylene, polytetrafluoroethylene, saturated or unsaturated polyester (for example, polyethylene terephthalate (PET), polybutylene terephthalate), polyamide , Polyacrylonitrile, and the like, and combinations thereof. The base material layer made of these materials may be used as a single layer, or may be used by laminating. For the purpose of further enhancing the barrier properties, a barrier layer such as a pure aluminum foil, an aluminum alloy foil, or an evaporated alumina or silica film may be laminated.

(Other layers)
The packaging bag film may have an optional other layer. As another layer, for example, an adhesive layer existing between the respective layers may be mentioned.

<< Production method of packaging bag with zipper tape >>
The method of the present invention for producing a packaging bag with a zipper tape comprises a fusing step of fusing the male member and the female member of the zipper tape to the non-adsorbent layer of the packaging bag film, respectively, A bag making process in which the member and the female member are opposed to each other, and the first male hook is located on the opening side, and the ends of the non-adsorbent layer are opposed to each other and fused to form a bag. Including.

When the ends of the non-adsorptive layer are fused to each other so as to face each other, at least a part of the chuck tape is placed between the ends of the non-adsorptive layers facing each other. And crushed integrally with the end of

Hereinafter, each step of the method of the present invention for producing a packaging bag with a zipper tape will be described with reference to FIG. Although FIG. 4 refers to an embodiment in which the packaging bag is a three-side sealed bag, the packaging bag may be a four-side sealed bag.

(Fusing process)
This is a step of fusing the chuck tape to the non-adsorptive layer of the packaging bag film.

In this step, for example, as shown in FIG. 4A, a film for a packaging bag having a non-adsorbent layer 200 is prepared, and then, as shown in FIG. This can be performed by fusing the male member 10 and the female member 20 to the adsorptive layer 200.

The fusing of the chuck tape may be performed separately from the formation of the chuck tape, or may be performed simultaneously with the formation of the chuck tape. In particular, when a four-side seal bag is to be manufactured, the male member and the female member may be fused to different packaging bag films.

(Bag making process)
In the bag making process, the male member and the female member of the zipper tape are opposed to each other, and the first male hook portion is located on the opening side, and the ends of the non-adsorbent layer are opposed to each other and fused. This is the step of making a bag.

In this step, for example, as shown in FIG. 4C, the male member 10 and the female member 20 of the chuck tape 100 are made to face each other, particularly, the male member 10 and the female member 20 are fitted to each other. In addition, the ends of the non-adhesive layer 200 are opposed to each other such that the first male hook portion 14a is located on the opening side, and as shown in FIG. This can be done by fusing the ends of 200 to form a bag. When the ends of the non-adsorptive layer 200 are made to face each other and fused to form a bag, for example, a part of the chuck tape 100 in a region 150 where the chuck tape 100 and the end overlap each other may be separated from each other. Between the end portions of the non-adsorbent layer 200 facing each other, the end portions of the non-adsorbent layer 200 can be fused and crushed integrally.

本 The present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these.

<< Preparation of resin composition >>
<Resin composition A>
Ethanol-vinyl alcohol copolymer (EVOH) (Evar, Kuraray Co., Ltd., ethylene monomer content: 44 mol%) and maleic anhydride-modified polyolefin (Admer, Mitsui Chemicals, Inc.) were subjected to high shear at a mass ratio of 88:12. Was melt-kneaded with a twin-screw extruder to produce a resin composition A.

<Resin composition B>
Resin composition B was prepared in the same manner as resin composition A, except that the above mass ratio was changed to 75:25.

<< Characteristic evaluation of resin composition >>
The following evaluation was performed about resin composition A and B, and low density polyethylene.

<Tensile modulus>
Using each of the prepared resin compositions, a 100 μm evaluation film was formed using a single-layer film forming machine.

(4) The formed evaluation film was cut into a width of 15 mm, and the tensile modulus was measured using a tensile tester at a tensile speed of 300 mm / min.

<Melt mass flow rate>
The melt mass flow rate (MFR) of each of the prepared resin compositions was measured under the conditions of a temperature of 190 ° C. and a load of 21.18 N according to the method A (mass measurement method) of JIS K7210-1.

構成 Table 1 shows the composition and evaluation results of each resin composition.

<Preparation of chuck tape>
A chuck tape having a female member that can be fitted to each other and a male member having a shape shown in Table 2 by using the prepared respective resin compositions by profile melt extrusion, and having a flange portion width of 7 mm and a thickness of about 100 μm. Was prepared. All of the samples were capable of forming the chuck tape. In addition, as the low-density polyethylene, the low-density polyethylene whose characteristics were evaluated above was used. The symbols α, β, A and B of “the shape of the male member” in Table 2 correspond to the respective symbols in FIG.

(4) The dimensions of the manufactured chuck tape were measured and confirmed by cross-sectional observation.

Next, using the above-mentioned zipper tape and the above-mentioned film for packaging bags, a packaging bag of 9 cm × 17 cm was produced by the method mentioned above with reference to FIG. 4, and the following items were evaluated.

《Evaluation》
<Opening strength>
A sensory evaluation of the opening strength was performed by performing an opening and closing test by five persons. Next, the non-open side of the produced packaging bag was cut, and the open / close test was similarly performed from the non-open side.

<Non-adsorbent>
The non-adhesiveness of the chuck tape was relatively evaluated based on the content of EVOH, which is a non-adsorptive resin, in each resin composition. The evaluation criteria are as follows.
〇: The content of EVOH is large, and good non-adsorption property is obtained.
Δ: EVOH content is somewhat high, and somewhat good non-adsorptivity is obtained.
X: The content of EVOH is low and the non-adsorption property is not good.

Table 2 shows the configurations and evaluation results of Examples and Comparative Examples.

From Table 1, it can be understood that the opening strength of the chuck tapes of Examples 1 to 5 was generally moderate. Further, in these examples, since the opening strength from the non-opening side was high, it can be understood that good sealing properties were obtained. The appropriate opening strength from the opening side is such that the above-mentioned tensile elastic modulus of the resin composition is 400 MPa or more, the angle α between the root portion and the opening side (first) male hook portion, and the root portion and the non-opening side. (Second) It is considered that the angle β with the male hook is obtained by obtuse angles. In addition, the strong opening strength from the non-opening side is that the angle α is larger than the angle β, and the projecting width A of the opening side (first) male hook from the root is the non-opening side ( Second) It is considered that the male hook is obtained by being smaller than the protruding width B from the root.

On the other hand, the chuck tapes of Comparative Examples 1 and 2 in which the angle β was an acute angle had the opening strength from the opening side that was too strong, and the tape of Comparative Example 3 in which the angle α exceeded 180 °. It can be understood that the opening strength of the zipper tape is too weak and the sealing property is not obtained.

Furthermore, the zipper tape of Comparative Example 4, which was manufactured in the same shape as that of Example 1 using low-density polyethylene, had an unsealing strength that was too weak to obtain sealing properties, while using low-density polyethylene. The chuck tape of the reference example manufactured in a shape in which the angle β was an acute angle had approximately moderate opening strength from the opening side and high opening strength from the non-opening side. From this, the shapes of Examples 1 to 5 in which the above-mentioned angle α and the above-mentioned angle β are both obtuse angles are suitable for resin compositions A and B but not for low-density polyethylene. It can be understood that the shape in which the angle β is an acute angle is suitable for low-density polyethylene, but not suitable for the resin compositions A and B.

10 Male Member 12 Root 14a First Male Hook 14b

Second Male Hook

16, 26 Flange 20 Female Member 24a First Female Hook 24b Second Female Hook 100 Chuck Tape 200 Non-adsorbent layer of film for packaging bag 250 Sealing part 300 Packaging bag α Angle between root and first male hook β Angle between root and second male hook A A Projection width of first male hook from root B Second male hook Projection width from root

Claims

A belt-shaped zipper tape comprising a male member and a female member that can be fitted to each other,
The male member and the female member are formed of a resin composition, a tensile modulus when the resin composition is formed into a 100 μm film is 400 MPa or more, and the male member has a root portion, and It has a first male hook and a second male hook located at the tip of the root,
In a cross section perpendicular to the longitudinal direction of the male member, the angle between the root and the first male hook and the angle between the root and the second male hook are both obtuse.
Chuck tape.
The chuck tape according to claim 1, wherein in the cross section, an angle between the root and the first male hook is larger than an angle between the root and the second male hook.
3. The chuck tape according to claim 1, wherein in the cross section, a width of the first male hook protruding from the root is smaller than a width of the second male hook protruding from the root.
The zipper tape according to any one of claims 1 to 3, wherein the resin composition contains an ethylene-vinyl alcohol copolymer and an acid-modified polyolefin-based resin.
The zipper tape according to claim 4, wherein the resin composition contains 65 to 95% by mass of an ethylene-vinyl alcohol copolymer and 5 to 35% by mass of an acid-modified polyolefin resin.
The content of the ethylene monomer in the ethylene-vinyl alcohol copolymer in the resin composition is based on the total number of moles of the ethylene monomer and the vinyl alcohol monomer in the entire ethylene-vinyl alcohol copolymer. The zipper tape according to claim 4 or 5, which is 10 to 70 mol%.
7. The resin composition according to claim 1, wherein a melt mass flow rate according to JIS K7210-1 is 0.4 g / 10 min or more at a temperature of 190 ° C. and a load of 21.18 N. A zipper tape according to item 1.
A packaging bag comprising a packaging bag film having a non-adsorbent layer containing an ethylene-vinyl alcohol copolymer as an innermost layer, the packaging bag, and the male member and the female member facing each other; The zipper tape according to any one of claims 1 to 7, wherein the first male hook is located on the opening side and is fused to the non-adsorptive layer. Packaging bag with zipper tape.
A zipper tape according to any one of claims 1 to 7,
A method for producing a packaging bag with a zipper tape using a packaging bag film having a non-adsorbent layer containing an ethylene-vinyl alcohol copolymer,
Fusing the male member and the female member of the chuck tape to the non-adsorptive layer, respectively; and the male member and the female member of the chuck tape face each other, and the first male hook is open. So that the ends of the non-adsorptive layer face each other and are fused to form a bag,
When the ends of the non-adsorptive layer are made to face each other and fused to form a bag, at least a part of the chuck tape is placed between the ends of the non-adsorptive layers facing each other. Fused and crushed integrally with the end of the non-adsorbent layer,
Manufacturing method of packaging bag with zipper tape.