US-12617586-B2 - Fitting tool and fitting-tool-equipped bag body

US12617586B2US 12617586 B2US12617586 B2US 12617586B2US-12617586-B2

Abstract

An object of the present invention is to provide a fitting tool in which interlayer peeling is less likely to occur and the occurrence of curling is suppressed, and a fitting-tool-equipped bag body using the fitting tool. In a fitting tool including a male side fitting member in which a male side fitting portion is provided on a band-shaped first base material, and a female side fitting member in which a female side fitting portion is provided on a band-shaped second base material, each of the first base material and the second base material includes a main layer, an interlayer, and a seal layer laminated from a fitting portion side, and satisfies that (1) the main layer, the interlayer, and the seal layer contain at least one kind of same type of resin, (2) a melting point T A (° C.) of the main layer, a melting point T B (° C.) of the interlayer, and a melting point T C (° C.) of the seal layer satisfy a relationship of T B >T A >T C , and (3) a thickness t A (μm) of the main layer, a thickness t B (μm) of the interlayer, and a thickness t C of the seal layer satisfy a relationship of t B >t A >t C .

Inventors

Naoto TANOUE
Shin TAKAGAWA

Assignees

C.I. TAKIRON CORPORATION

Dates

Publication Date: 20260505
Application Date: 20230317
Priority Date: 20220331

Claims (6)

1 . A fitting tool comprising: a male side fitting member in which a male side fitting portion is provided on a surface of a band-shaped first base material along a longitudinal direction; and a female side fitting member in which a female side fitting portion is provided on a surface of a band-shaped second base material along the longitudinal direction, wherein the male side fitting portion and the female side fitting portion are detachably fit, each of the first base material and the second base material includes a main layer, a seal layer provided on a side of the main layer opposite the male side fitting portion and the female side fitting portion, and an interlayer provided between the main layer and the seal layer, and each of the first base material and the second base material satisfies the following conditions (1) to (3), (1) the main layer, the interlayer, and the seal layer contain at least one kind of same type of resin, (2) a melting point TA (° C.) of the main layer, a melting point TB (° C.) of the interlayer, and a melting point TC (° C.) of the seal layer satisfy a relationship of TB>TA>TC (the melting point TA, in a case where the main layer is formed of a plurality of resins, is a lowest melting point among melting points of the resins, and the same applies to the melting point TB and the melting point TC), (3) a thickness tA (μm) of the main layer, a thickness tB (μm) of the interlayer, and a thickness tC of the seal layer satisfy a relationship of tB>tA>tC.
2 . The fitting tool according to claim 1 , wherein the interlayer contains a resin having a density of 930 kg/m3 or more.
3 . The fitting tool according to claim 1 , wherein, in a cut surface obtained by cutting the fitting tool in a fit state in a direction perpendicular to the longitudinal direction, both a curl angle θ 1 of the male side fitting member, which is obtained by the following method (1), and a curl angle θ 2 of the female side fitting member, which is obtained by the following method (2), are 0.5° or more and 20° or less, and both a position D 3 of a terminal of the male side fitting member, which is obtained by the following method (3), and a position D 5 of a terminal of the female side fitting member, which is obtained by the following method (4), are −1.5 mm or more and +0.75 mm or less, Method (1): a center line of the male side fitting portion in a width direction is defined as a straight line k 1 , an intersection of the straight line k 1 with a surface of the first base material opposite a surface on which the male side fitting portion is provided is defined as a point O 1 , and a straight line orthogonal to the straight line k 1 passing through the point O 1 is defined as a reference line k 2 , a position on one end portion side of the straight line k 1 of the first base material, at which a distance from the reference line k 2 on the surface of the first base material is the largest, is defined as a point A 1 , a position of an end on the one end portion side of the first base material on the reference line k 2 , in a state where the first base material is linearly extended along the reference line k 2 , is defined as a point C 1 , an angle θA 1 (an angle in a direction curled from the reference line) between a straight line passing through the point A 1 and the point O 1 and the reference line k 2 is measured, a position on the other end portion side of the straight line k 1 of the first base material, at which a distance from the reference line k 2 on the surface of the first base material is the largest, is defined as a point B 1 , a position of an end on the other end portion side of the first base material on the reference line k 2 , in a state where the first base material is linearly extended along the reference line k 2 , is defined as a point D 1 , an angle θB 1 (an angle in a direction curled from the reference line) between a straight line passing through the point B 1 and the point O 1 and the reference line k 2 is measured, an average of the angle θA 1 and the angle θB 1 is defined as a curl angle θ 1 , Method (2): a center line of the female side fitting portion in a width direction is defined as a straight line k 3 , an intersection of the straight line k 3 with a surface of the second base material opposite a surface on which the female side fitting portion is provided is defined as a point O 2 , and a straight line orthogonal to the straight line k 3 passing through the point O 2 is defined as a reference line k 4 , a position on one end portion side of the straight line k 3 of the second base material, at which a distance from the reference line k 4 on the surface of the second base material is the largest, is defined as a point A 2 , a position of an end on the one end portion side of the second base material on the reference line k 4 , in a state where the second base material is linearly extended along the reference line k 4 , is defined as a point C 2 , an angle θA 2 (an angle in a direction curled from the reference line) between a straight line passing through the point A 2 and the point O 2 and the reference line k 4 is measured, a position on the other end portion side of the straight line k 3 of the second base material, at which a distance from the reference line k 4 on the surface of the second base material is the largest, is defined as a point B 2 , a position of an end on the other end portion side of the second base material on the reference line k 4 , in a state where the second base material is linearly extended along the reference line k 4 , is defined as a point D 2 , an angle θB 2 (an angle in a direction curled from the reference line) between a straight line passing through the point B 2 and the point O 2 and the reference line k 4 is measured, an average of angle θA 2 and angle θB 2 is defined as a curl angle θ 2 , Method (3): a center line of the male side fitting portion in a width direction is defined as a straight line k 1 , an intersection of the straight line k 1 with the surface of the first base material opposite a surface on which the male side fitting portion is provided is defined as a point O 1 , and a straight line orthogonal to the straight line k 1 passing through the point O 1 is defined as a reference line k 2 , a position on one end portion side of the straight line k 1 of the first base material, farthest from the reference line k 2 on a terminal of the male side fitting member is defined as a point A 3 , a distance DA 3 (mm) between the point A 3 and the reference line k 2 is measured (a region where the male side fitting portion is located with respect to the reference line k 2 is defined as + (plus), and a region on a side opposite the region where the male side fitting portion is located with respect to the reference line k 2 is defined as − (minus)), a position on the other end portion side of the straight line k 1 of the first base material, farthest from the reference line k 2 on the terminal of the male side fitting member is defined as a point B 3 , a distance DB 3 (mm) between the point B 3 and the reference line k 2 is measured (the plus and the minus are the same as the distance DA 3 ), an average of the distance DA 3 and the distance DB 3 is obtained, and an average value thereof is defined as a position D 3 of the terminal of the male side fitting member with respect to the reference line k 2 , Method (4): a center line of the female side fitting portion in a width direction is defined as a straight line k 3 , an intersection of the straight line k 3 with a surface of the second base material opposite a surface on which the female side fitting portion is provided is defined as a point O 2 , and a straight line orthogonal to the straight line k 3 passing through the point O 2 is defined as a reference line k 4 , a position on one end portion side of the straight line k 3 of the second base material, farthest from the reference line k 4 on a terminal of the female side fitting member is defined as a point A 5 , a distance DA 5 (mm) between the point A 5 and the reference line k 4 is measured (a region where the female side fitting portion is located with respect to the reference line k 4 is defined as + (plus), and a region on a side opposite the region where the female side fitting portion is located with respect to the reference line k 4 is defined as − (minus)), a position on the other end portion side of the straight line k 3 of the second base material, farthest from the reference line k 4 on the terminal of the female side fitting member is defined as a point B 5 , a distance DB 5 (mm) between the point B 5 and the reference line k 4 is measured (the plus and the minus are the same as the distance DA 5 ), an average of the distance DA 5 and the distance DB 5 is obtained, and an average value thereof is defined as a position D 5 of the terminal of the female side fitting member with respect to the reference line k 4 .
4 . The fitting tool according to claim 1 , wherein a tensile stress obtained by the following tensile stress measurement is 5 N/mm or more and 30 N/mm or less, (Tensile stress measurement) a test piece having a length of 120 mm in the longitudinal direction is cut out from the male side fitting member, both ends of the test piece in the longitudinal direction are gripped by a tensile testing machine, and a tensile test is performed under conditions of a chuck distance of 50 mm and a test speed of 1 mm/min, thereby obtaining a tensile stress (N/mm) by dividing a test force (N) at 2% elongation by an elongation amount (mm).
5 . The fitting tool according to claim 1 , wherein, in each of the first base material and the second base material, a ratio of a thickness of each layer to a total thickness of the base material is 10% to 47% for the main layer, 38% to 85% for the interlayer, and 5% to 25% for the seal layer.
6 . A fitting-tool-equipped bag body comprising: the fitting tool according to claim 1 ; and a bag main body that accommodates a content, wherein the fitting tool is attached to an inner surface of the bag main body.

Description

TECHNICAL FIELD The present invention relates to a fitting tool, particularly a fitting tool in which interlayer peeling is less likely to occur and curling is less likely to occur after molding, and a fitting-tool-equipped bag body using the same. Priority is claimed on Japanese Patent Application No. 2022-058737, filed Mar. 31, 2022, the content of which is incorporated herein by reference. BACKGROUND ART In various fields such as food, chemicals, general goods, and the like, a fitting-tool-equipped bag body in which a fitting tool that opens and closes an opening portion is attached to an inner surface of a bag main body in the vicinity of the opening portion is widely used. The fitting tool is required to be able to be adhered so as not to impair the appearance of the bag body during bag making. In a fitting tool of the related art, the occurrence of wrinkles and deterioration of the appearance during bag making are suppressed by using a base material including a resin layer having high hardness. Patent Document 1 discloses a fitting tool including a three-layered base material including a front surface layer and a rear surface layer consisting of a polyethylene or polypropylene resin film, and an interlayer consisting of a nylon or polyester resin film. CITATION LIST Patent Document Patent Document 1: Japanese Unexamined Patent Application, First Publication No. H06-122460 SUMMARY OF INVENTION Technical Problem It is important that a fitting tool having a multilayer structure sufficiently suppress the occurrence of interlayer peeling. In addition, in a case where curling occurs in the fitting tool after molding, it is difficult to adhere the fitting tool to a bag main body. However, in Patent Document 1, the suppression of curling while suppressing interlayer peeling was not studied. An object of the present invention is to provide a fitting tool in which interlayer peeling is less likely to occur and the occurrence of curling is suppressed, and a fitting-tool-equipped bag body using the fitting tool. Solution to Problem The present invention includes the following aspects. [1] A fitting tool including a male side fitting member in which a male side fitting portion is provided on a surface of a band-shaped first base material along a longitudinal direction, and a female side fitting member in which a female side fitting portion is provided on a surface of a band-shaped second base material along the longitudinal direction, in which the male side fitting portion and the female side fitting portion are detachably fit, in which each of the first base material and the second base material includes a main layer, a seal layer provided on a side of the main layer opposite the male side fitting portion and the female side fitting portion, and an interlayer provided between the main layer and the seal layer, and each of the first base material and the second base material satisfies the following conditions (1) to (3). (1) The main layer, the interlayer, and the seal layer contain at least one kind of same type of resin.(2) A melting point TA (° C.) of the main layer, a melting point TB (° C.) of the interlayer, and a melting point TC (° C.) of the seal layer satisfy a relationship of TB>TA>TC (the melting point TA, in a case where the main layer is formed of a plurality of resins, is a lowest melting point among melting points of the resins, and the same applies to the melting point TB and the melting point TC).(3) A thickness tA (μm) of the main layer, a thickness tB (μm) of the interlayer, and a thickness tC of the seal layer satisfy a relationship of tB>tA>tC. [2] The fitting tool according to [1], in which the interlayer contains a resin having a density of 930 kg/m3 or more. [3] The fitting tool according to [1] or [2], in which, in a cut surface obtained by cutting the fitting tool in a fit state in a direction perpendicular to the longitudinal direction, both a curl angle θ1 of the male side fitting member, which is obtained by the following method (1), and a curl angle θ2 of the female side fitting member, which is obtained by the following method (2), are 0.5° or more and 20° or less, and both a position D3 of a terminal of the male side fitting member, which is obtained by the following method (3), and a position D5 of a terminal of the female side fitting member, which is obtained by the following method (4), are −1.5 mm or more and +0.75 mm or less. Method (1) A center line of the male side fitting portion in a width direction is defined as a straight line k1, an intersection of the straight line k1 with a surface of the first base material opposite a surface on which the male side fitting portion is provided is defined as a point O1, and a straight line orthogonal to the straight line k1 passing through the point O1 is defined as a reference line k2. A position on one end portion side of the straight line k1 of the first base material, at which a distance from the reference line k2 on the surface o