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JP-7854834-B2 - Fitting device and bag with fitting device

JP7854834B2JP 7854834 B2JP7854834 B2JP 7854834B2JP-7854834-B2

Inventors

  • 田上 直斗
  • ▲高▼川 新

Assignees

  • タキロンシーアイ株式会社

Dates

Publication Date
20260507
Application Date
20220331

Claims (6)

  1. A fitting device comprising a male fitting member having a male fitting portion provided along the longitudinal direction on the surface of a strip-shaped first base material, and a female fitting member having a female fitting portion provided along the longitudinal direction on the surface of a strip-shaped second base material, wherein the male fitting portion and the female fitting portion are detachably fitted together, The first substrate and the second substrate each comprise a main layer, a sealing layer provided on the side of the main layer opposite to the male and female fitting portions, and an intermediate layer provided between the main layer and the sealing layer. A fitting device that satisfies the following conditions (1) to (3) in each of the first base material and the second base material. (1) The main layer, the intermediate layer, and the sealing layer each contain at least one type of resin. (2) The melting point TA (°C) of the main layer, the melting point TB (°C) of the intermediate layer, and the melting point TC (°C) of the seal layer satisfy the relationship TB > TA > TC (however, if there are multiple resins constituting the main layer, the melting point TA is the lowest melting point among those resins, and the same applies to the melting points TB and TC ). (3) The thickness tA (μm) of the main layer, the thickness tB (μm) of the intermediate layer, and the thickness tC (μm) of the seal layer satisfy the relationship tB > tA > tC .
  2. The fitting device according to claim 1, wherein the intermediate layer contains a resin with a density of 930 kg/m³ or more .
  3. The fitting device according to claim 1 or 2, wherein, in the cross-section obtained by cutting the fitting device in a fitted state perpendicular to the longitudinal direction, the curl angle θ1 of the male fitting member determined by the method (1) below and the curl angle θ2 of the female fitting member determined by the method (2) below are both 0.5° or more and 20° or less, and the position D3 of the end of the male fitting member determined by the method (3) below and the position D5 of the end of the female fitting member determined by the method (4) below are both -1.5 mm or more and +0.75 mm or less. Method (1): The center line in the width direction of the male fitting portion is defined as a straight line k1, point O1 is defined as the intersection of the straight line k1 and the opposite surface of the first base material on which the male fitting portion is provided, and a straight line perpendicular to the straight line k1 passing through point O1 is defined as the reference line k2. Point A1 is defined as the position on the surface of the first substrate where the distance from the reference line k2 is maximum, at one end of the straight line k1 of the first substrate. Point C1 is defined as the position of the end of the first substrate on the reference line k2 when the first substrate is extended in a straight line along the reference line k2. The angle θA1 (angle in the direction of curl from the reference line) made between the straight line passing through point A1 and point O1 and the reference line k2 is measured. Point B1 is defined as the position on the surface of the first substrate where the distance from the reference line k2 is maximum, on the other end side of the straight line k1 of the first substrate. Point D1 is defined as the position of the other end side of the first substrate on the reference line k2 when the first substrate is extended in a straight line along the reference line k2. The angle θB1 (angle in the direction of curl from the reference line) made between the straight line passing through point B1 and point O1 and the reference line k2 is measured. Let the average of angles θ A1 and θ B1 be the curl angle θ 1 . Method (2): The center line in the width direction of the female fitting portion is defined as a straight line k3, point O2 is defined as the intersection of the opposite surface of the second base material on which the female fitting portion is provided and the straight line k3, and a straight line passing through point O2 and perpendicular to the straight line k3 is defined as a reference line k4. Point A2 is defined as the position on the surface of the second substrate where the distance from the reference line k4 is maximum, on one end side of the straight line k3 of the second substrate. Point C2 is defined as the position of the end on the reference line k4 on the second substrate when the second substrate is extended in a straight line along the reference line k4. The angle θA2 (angle in the direction of curl from the reference line) made between the straight line passing through point A2 and point O2 and the reference line k4 is measured. Point B2 is defined as the position on the surface of the second substrate where the distance from the reference line k4 is maximum, on the other end side of the straight line k3 of the second substrate. Point D2 is defined as the position of the other end side of the second substrate on the reference line k4 when the second substrate is extended in a straight line along the reference line k4. The angle θB2 (angle in the direction of curl from the reference line) made between the straight line passing through point B2 and point O2 and the reference line k4 is measured. Let the average of angles θ A2 and θ B2 be the curl angle θ2 . Method (3): The center line in the width direction of the male fitting portion is defined as a straight line k1, point O1 is defined as the intersection of the straight line k1 and the opposite surface of the first base material on which the male fitting portion is provided, and a straight line perpendicular to the straight line k1 passing through point O1 is defined as the reference line k2. Point A3 is defined as the position on one end of the straight line k1 of the first substrate, furthest from the reference line k2 at the end of the male fitting member. The distance D A3 (mm) between point A3 and the reference line k2 is measured (wherein the region where the male fitting portion is located is defined as + (positive) relative to the reference line k2, and the region opposite to the region where the male fitting portion is located is defined as - (negative) relative to the reference line k2). Point B3 is defined as the position on the other end of the straight line k1 of the first substrate, furthest from the reference line k2 at the end of the male fitting member. The distance D B3 (mm) between point B3 and the reference line k2 is measured (where plus and minus are the same as the distance D A3 ). The average of the distances D A3 and D B3 is calculated, and this average value is taken as the position D 3 of the end of the male fitting member relative to the reference line k2. Method (4): The center line in the width direction of the female fitting portion is defined as a straight line k3, point O2 is defined as the intersection of the opposite surface of the second base material on which the female fitting portion is provided and the straight line k3, and a straight line passing through point O2 and perpendicular to the straight line k3 is defined as a reference line k4. Point A5 is defined as the position on one end of the straight line k3 of the second substrate, furthest from the reference line k4 at the end of the female fitting member. The distance D A5 (mm) between point A5 and the reference line k4 is measured (wherein the region where the female fitting portion is located is considered positive relative to the reference line k4, and the region opposite to the region where the female fitting portion is located is considered negative relative to the reference line k4). Point B5 is defined as the position on the other end of the straight line k3 of the second substrate, furthest from the reference line k4 at the end of the female fitting member. The distance D B5 (mm) between point B5 and the reference line k4 is measured (where plus and minus are the same as for the distance D A5 ). The average of the distances D A5 and D B5 is calculated, and this average value is taken as the position D 5 of the end of the female fitting member relative to the reference line k4.
  4. The fitting device according to any one of claims 1 to 3, wherein the tensile stress determined by the tensile stress measurement described below is 5 N/mm or more and 30 N/mm or less. (Tensile stress measurement) A test piece with a longitudinal length of 120 mm is cut from the male fitting member, and both ends of the test piece in the longitudinal direction are gripped in a tensile testing machine. A tensile test is performed under the conditions of a chuck distance of 50 mm and a test speed of 1 mm/min, and the tensile stress (N/mm) is determined by dividing the test force (N) at 2% elongation by the amount of elongation (mm).
  5. The fitting device according to any one of claims 1 to 4, wherein in each of the first and second substrates, the ratio of the thickness of each layer to the total thickness of the substrate is 10 to 47% for the main layer, 38 to 85% for the intermediate layer, and 5 to 25% for the sealing layer.
  6. A fitting device according to any one of claims 1 to 5, and a bag body for containing contents, A bag body with a fitting, wherein the fitting is attached to the inner surface of the bag body.

Description

This invention relates to a fitting device, particularly one that is less prone to delamination and less prone to curling after molding, and to a bag body with the fitting device using the same. In various fields such as food, pharmaceuticals, and general merchandise, bags with fasteners are widely used, in which a fastener is attached to the inner surface near the opening of the bag body to seal the opening in an openable and closable manner. The fasteners must be able to adhere to the bag in a way that does not damage the bag's appearance during the bag-making process. Conventional fasteners use a base material containing a high-hardness resin layer to suppress wrinkles that occur during bag-making and spoil the appearance. Patent Document 1 discloses a fitting device comprising a three-layer base material including a surface layer and a back layer made of polyethylene or polypropylene resin film, and an intermediate layer made of nylon or polyester resin film. Japanese Patent Application Publication No. 06-122460 Figure 1 is a schematic perspective view showing a fitting device of an example embodiment.Figure 2 is a cross-sectional view of the fitting shown in Figure 1, taken from a plane perpendicular to the longitudinal direction.Figure 3 is a cross-sectional view illustrating method (1) for determining the curl angle θ1 of the male fitting member.Figure 4 is a cross-sectional view illustrating method (2) for determining the curl angle θ2 of the female fitting member.Figure 5 is a cross-sectional view illustrating method (3) for determining the position D3 of the end of the male fitting member.Figure 6 is a cross-sectional view illustrating method (4) for determining the position D5 of the end of the female fitting member.Figure 7 is a schematic front view showing a bag with a fitting device, which is an example of an embodiment.Figure 8 is a perspective view showing the top of the bag with the fastener shown in Figure 7 opened. [Fitting device] The fitting device of the present invention will be described below with reference to an example shown in the drawings. Note that the dimensions and other specifications shown in the following description are examples only, and the present invention is not necessarily limited to them. It can be modified as appropriate without altering its essence. As shown in Figure 1, the fitting device 1 of an example embodiment comprises a male fitting member 10, which has a male fitting portion 12 provided along the longitudinal direction on the surface 11a of a strip-shaped first base material 11, and a female fitting member 20, which has a female fitting portion 22 provided along the longitudinal direction on the surface 21a of a strip-shaped second base material 21. The male fitting portion 12 in one example shown in Figure 2 comprises a trunk 12a rising from the surface 11a of the first base material 11, which is the surface facing the second base material 21, and a head 12b provided at the tip of the trunk 12a, which is larger than the trunk 12a and has a substantially semicircular cross-section. The female fitting portion 22 comprises a pair of arm portions 22a and 22b rising in an arc shape in cross-section from the surface 21a of the second base material 21, which is the surface facing the first base material 11, and a recess 22c is formed inside these arm portions 22a and 22b. The male fitting portion 12 and the female fitting portion 22 are detachably fitted together by the head portion 12b of the male fitting portion 12 fitting into the recess 22c of the female fitting portion 22. The configuration of the male fitting portion 12 and the female fitting portion 22 is not limited to the configuration shown in Figure 2, as long as they are detachably fitted together. As shown in Figure 2, the first base material 11 comprises a main layer 13, a sealing layer 14 provided on the side of the main layer 13 opposite the male fitting portion 12, and an intermediate layer 15 provided between the main layer 13 and the sealing layer 14. That is, the first base material 11 has a three-layer structure in which the main layer 13, intermediate layer 15, and sealing layer 14 are laminated in this order from the male fitting portion 12 side. The first substrate 11 satisfies the following requirements (1) to (3). By satisfying requirements (1) to (3), delamination is less likely to occur in the first substrate 11, and curling of the male fitting member 10 is suppressed. (1) The main layer 13, the intermediate layer 15, and the sealing layer 14 each contain at least one type of resin of the same kind (hereinafter also referred to as "same type resin A"). (2) The melting point TA (°C) of the main layer 13, the melting point TB (°C) of the intermediate layer 15, and the melting point TC (°C) of the seal layer 14 satisfy the relationship TB > TA > TC . (3) The thickness t A (μm) of the main layer 13, the thickness t B (μm) of the intermediate layer 15, and the thickness t C (μm) of the s