Fitting and bag body with fitting

Abstract

To provide a bag body with a fitting tool and a fitting tool in which delamination is less likely to occur and curl generation is suppressed.SOLUTION: There is provided a fitting tool in which a male side fitting part of a belt-shaped male side fitting member, and a female side fitting part of a belt-shaped female side fitting member are detachably fitted, a first substrate of the male side fitting member and a second substrate of the female side fitting member each have: a main layer; a seal layer; and an intermediate layer provided between the main layer and the seal layer. The intermediate layer is provided on each of the first and second substrates, in each of both sides of a region where the male side fitting part exists, and a region where the female side fitting part exists, in a width direction. A curl angle θ1 of the male side fitting member and a curl angle θ2 of the female side fitting member are 0.5° or greater and 20° or smaller, and a position D3 of a terminal of the male side fitting member, and a position D5 of a terminal of the female side fitting member are -1.8 mm or greater and +0.75 mm or smaller.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a fitting, particularly a fitting in which delamination is less likely to occur and curl is less likely to occur after molding, and a bag body with a fitting using the same.

Background Art

[0002] In various fields such as food, medicine, and sundries, a bag body with a fitting in which a fitting for opening and closing an opening is attached to the inner surface near the opening of the bag body is widely used. The fitting is required to be able to be adhered so as not to damage the appearance of the bag body during bag making. In conventional fittings, by using a base material containing a resin layer with high hardness, the occurrence of wrinkles and deterioration of the appearance during bag making are suppressed. Patent Document 1 discloses a fitting provided with a base material having a three-layer structure including a surface layer and a back layer made of a polyethylene or polypropylene resin film and an intermediate layer made of a nylon or polyester resin film.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For a fitting having a multilayer structure, it is important to sufficiently suppress the occurrence of delamination. In addition, if curl occurs in the fitting after molding, it becomes difficult to adhere to the bag body. However, in Patent Document 1, the suppression of the occurrence of curl while suppressing delamination has not been studied.

[0005] An object of the present invention is to provide a fitting in which delamination is less likely to occur and the occurrence of curl is suppressed, and a bag body with a fitting using the fitting.

Means for Solving the Problems

[0006] The present invention includes the following aspects. [1] 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, the male fitting portion and the female fitting portion being a fitting tool that is detachably fitted, Each of the first base material and the second base material includes a main layer, a seal layer provided on the side opposite to the male fitting portion and the female fitting portion of the main layer, and an intermediate layer provided between the main layer and the seal layer. The intermediate layer is disposed in each of the first base material and the second base material in regions on both sides of the region where the male fitting portion and the female fitting portion exist in the width direction thereof. On a cut surface obtained by cutting the fitting tool in the fitting state perpendicular to the longitudinal direction, the curl angle θ of the first base material obtained by the following method (1) 1 and the curl angle θ of the second base material obtained by the following method (2) 2 are both 0.5° or more and 20° or less, On a cut surface obtained by cutting the fitting tool in the fitting state perpendicular to the longitudinal direction, the position D of the end of the male fitting member obtained by the following method (3) 3 and the position D of the end of the female fitting member obtained by the following method (4) 5 are both -1.8 mm or more and +0.75 mm or less, a fitting tool. Method (1): Taking the center line in the width direction of the male fitting portion as a straight line k1, taking the intersection point of the surface opposite to the surface where the male fitting portion of the first base material is provided and the straight line k1 as a point O1, and taking a straight line perpendicular to the straight line k1 passing through the point O1 as a reference line k2. On one end side of the straight line k1 of the first substrate, a position on the surface of the first substrate where the distance from the reference line k2 is maximized is defined as point A1. On the first substrate in a state where the first substrate is linearly extended along the reference line k2, the position of the end on the one end side on the reference line k2 is defined as point C1. The angle θ formed by the straight line passing through point A1 and point O1 and the reference line k2 A1 (the angle in the direction of curling from the reference line) is measured. On the other end side of the straight line k1 of the first substrate, a position on the surface of the first substrate where the distance from the reference line k2 is maximized is defined as point B1. On the first substrate in a state where the first substrate is linearly extended along the reference line k2, the position of the end on the other end side on the reference line k2 is defined as point D1. The angle θ formed by the straight line passing through point B1 and point O1 and the reference line k2 B1 (the angle in the direction of curling from the reference line) is measured. Angle θ A1 and angle θ B1 The average of them is defined as the curl angle θ 1 and is used as such. Method (2): Let the center line in the width direction of the female fitting portion be the straight line k3, the intersection of the opposite surface of the surface of the second substrate where the female fitting portion is provided and the straight line k3 be point O2, and the straight line perpendicular to the straight line k3 passing through point O2 be the reference line k4. On one end side of the straight line k3 of the second substrate, a position on the surface of the second substrate where the distance from the reference line k4 is maximized is defined as point A2. On the second substrate in a state where the second substrate is linearly extended along the reference line k4, the position of the end on the one end side on the reference line k4 is defined as point C2. The angle θ formed by the straight line passing through point A2 and point O2 and the reference line k4 A2 (the angle in the direction of curling from the reference line) is measured. On the other end side of the straight line k3 of the second substrate, a position on the surface of the second substrate where the distance from the reference line k4 is maximum is defined as point B2. On the second substrate in a state where the second substrate is linearly extended along the reference line k4, a position of the end on the other end side on the reference line k4 is defined as point D2. An angle θ B2 (the angle in the direction of curling from the reference line) is measured. Angle θ A2 and the average of the angles θ B2 is defined as the curl angle θ 2 . Method (3): Let the center line in the width direction of the male fitting portion be a straight line k1, let the intersection of the surface of the first substrate opposite to the surface where the male fitting portion is provided and the straight line k1 be point O1, and let a straight line perpendicular to the straight line k1 passing through point O1 be a reference line k2. On one end side of the straight line k1 of the first substrate, a position on the male fitting member farthest from the reference line k2 at the end is defined as point A3. The distance D A3 (mm) from point A3 to the reference line k2 is measured (where, with respect to the reference line k2, the region where the male fitting portion is located is + (plus), and the region on the opposite side of the region where the male fitting portion is located with respect to the reference line k2 is - (minus)). On the other end side of the straight line k1 of the first substrate, a position on the male fitting member farthest from the reference line k2 at the end is defined as point B3. The distance D B3 (mm) from point B3 to the reference line k2 is measured (where plus and minus are the same as for the distance D A3 ). The average of the distances D A3 and the distance D B3 is obtained, and the average value is defined as the position D 3 of the end of the male fitting member with respect to the reference line k2. Method (4): Let the center line in the width direction of the female fitting portion be a straight line k3, let the intersection of the surface of the second substrate opposite to the surface where the female fitting portion is provided and the straight line k3 be point O2, and let a straight line perpendicular to the straight line k3 passing through point O2 be a reference line k4. On one end side of the straight line k3 of the second base material, a point A5 is defined as the position farthest from the reference line k4 at the end of the female fitting member. The distance D A5 (mm) between the point A5 and the reference line k4 is measured (however, with respect to the reference line k4, the region where the female fitting portion is located is defined as + (plus), and the region on the opposite side of the region where the female fitting portion is located with respect to the reference line k4 is defined as - (minus).). On the other end side of the straight line k3 of the second base material, a point B5 is defined as the position farthest from the reference line k4 at the end of the female fitting member. The distance D B5 (mm) between the point B5 and the reference line k4 is measured (however, the plus and minus signs are the same as those for the distance D A5 ). The distance D A5 and the distance D B5 are averaged, and the average value is defined as the position D 5 of the end of the female fitting member with respect to the reference line k4. [2] The sealing layer is disposed on both sides of the regions where the male fitting portion and the female fitting portion are present in the width direction of each of the first base material and the second base material, respectively, in the fitting tool according to [1]. [3] On the cross-sectional surface obtained by cutting the fitting tool in the fitting state perpendicular to the longitudinal direction, the position D 3 of the end of the male fitting member obtained by the method (3) and the position D 5 of the end of the female fitting member obtained by the method (4) are both -1.5 mm or more and -0.01 mm or less, in the fitting tool according to [1] or [2]. [4] A fitting tool according to any one of [1] to [3], and a bag body for accommodating contents, wherein the fitting tool is attached to the inner surface of the bag body, a bag body with a fitting tool.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a fitting tool in which delamination between layers hardly occurs and the generation of curl is suppressed, and a bag body with a fitting tool using the fitting tool.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

MODE FOR CARRYING OUT THE INVENTION

[0009] [Fitting] Hereinafter, an example of the fitting of the present invention will be shown and described with reference to the drawings. Note that the dimensions and the like of the figures illustrated in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be appropriately modified and implemented without changing the gist thereof.

[0010] As shown in FIG. 1, a fitting 1 according to an example of the embodiment includes a male fitting member 10 in which a male fitting portion 12 is provided along the longitudinal direction on a surface 11a of a strip-shaped first base material 11, and a female fitting member 20 in which a female fitting portion 22 is provided along the longitudinal direction on a surface 21a of a strip-shaped second base material 21.

[0011] One example of the male fitting portion 12 shown in FIG. 2 includes a stem portion 12a rising from a surface 11a which is a surface of the first base material 11 facing the second base material 21, and a head portion 12b provided at the tip of the stem portion 12a and having a substantially semi-circular cross section larger than that of the stem portion 12a. The female fitting portion 22 includes a pair of arm portions 22a, 22b rising in an arc shape in cross section from a surface 21a which is a surface of the second base material 21 facing the first base material 11, and a concave portion 22c is formed inside these arm portions 22a, 22b. The male fitting portion 12 and the female fitting portion 22 are detachably fitted by fitting the head portion 12b of the male fitting portion 12 into the concave portion 22c of the female fitting portion 22. Note that the modes of the male fitting portion 12 and the female fitting portion 22 only need to be detachably fitted, and are not limited to the mode shown in FIG. 2.

[0012] As shown in FIG. 2, the first base material 11 includes a main layer 13, a seal layer 14 provided on the side of the main layer 13 opposite to the male fitting portion 12, and an intermediate layer 15 provided between the main layer 13 and the seal layer 14.

[0013] The intermediate layer 15 of the first base material 11 is not provided in the region 30 where the male fitting portion 12 and the female fitting portion 22 exist in the width direction of the first base material 11, and is disposed in the regions 31, 32 on both sides thereof, respectively. By not providing the intermediate layer 15 in the region 30 where the fitting portion of the first base material 11 exists, curling of the male fitting member 10 is suppressed from occurring.

[0014] The widthwise distance d between the end on the fitting portion side of the intermediate layer 15 in the region 31 (the region on the right side of the region 30 in FIG. 2) on one end side where the fitting portion does not exist in the width direction of the first base material 11 and the female fitting portion 22 1 is preferably 0 mm or more, more preferably 0.2 mm or more, and even more preferably 0.4 mm or more. On the other hand, the distance d 1 is preferably 3 mm or less, more preferably 2 mm or less, and even more preferably 1 mm or less. The lower limit and the upper limit of the distance d 1 can be arbitrarily combined. For example, it is preferably 0 mm or more and 3 mm or less, more preferably 0.2 mm or more and 2 mm or less, and even more preferably 0.4 mm or more and 1 mm or less. The distance d1 If it is within the above range, it is easy to suppress the occurrence of curling in the male fitting member 10.

[0015] The widthwise distance d between the end on the fitting portion side of the intermediate layer 15 in the region 32 (the region on the left side of the region 30 in FIG. 2) where there is no fitting portion on the other end side in the width direction of the first base material 11 and the female fitting portion 22 2 The preferable lower limit and upper limit of are the same as the preferable range of the preferable lower limit and upper limit of the distance d 1 is the same as the preferable range of the preferable lower limit and upper limit.

[0016] In the example shown in FIG. 2, in any of the regions 31 and 32 where there is no fitting portion of the first base material 11, the position of the end on the side opposite to the fitting portion of the intermediate layer 15 coincides with the end of the first base material 11. Note that the present invention is not limited to this embodiment, and the end on the side opposite to the fitting portion of the intermediate layer 15 may be located closer to the fitting portion side than the end of the first base material 11. The widthwise distance between the end on the side opposite to the fitting portion of the intermediate layer 15 and the end of the first base material 11 is preferably 1 mm or less, and particularly preferably 0 mm.

[0017] The material for forming the main layer 13 is not particularly limited, and those used for the base materials of known fittings can be used. For example, polyethylene such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymer, polypropylene, ethylene-vinyl acetate copolymer, etc., polyester resins (polyethylene terephthalate, polyethylene naphthalate, etc.), polyamide resins (nylon, etc.) can be exemplified. Among them, from the viewpoint of the balance between rigidity and flexibility, polyolefin resins such as polyethylene and polypropylene are preferable, and it is more preferable to contain at least one of LDPE and LLDPE. As the material for forming the main layer, one kind may be used alone, or two or more kinds may be used in combination.

[0018] The material for forming the seal layer 14 is not particularly limited, and examples thereof include LLDPE, unstretched polypropylene, ethylene-vinyl acetate copolymer, and ionomer. Among them, LLDPE is preferable from the viewpoints of flexibility and low-temperature sealability. As the material for forming the seal layer, one kind may be used alone, or two or more kinds may be used in combination.

[0019] The material for forming the intermediate layer 15 is not particularly limited, and those used for the base materials of known fittings can be used. Examples thereof include polyethylene such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), and ethylene-α-olefin copolymer, polypropylene, ethylene-vinyl acetate copolymer, etc., polyester resins (such as polyethylene terephthalate and polyethylene naphthalate), polyamide resins (such as nylon), etc. Among them, resins with a density of 930 kg / m 3 or higher are preferable, and high-density polyethylene (HDPE) is particularly preferable. The materials for forming the intermediate layer 15 in the region 31 and the intermediate layer 15 in the region 32 may be the same or different.

[0020] The main layer 13, the seal layer 14, and the intermediate layer 15 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, molding aids, and colorants, as required.

[0021] The width of the first base material 11 is preferably 2 mm or more, more preferably 3 mm or more, since sufficient seal strength can be easily obtained when heat-sealed to the bag body. The width of the first base material 11 is preferably 60 mm or less, more preferably 40 mm or less, since it has excellent flexibility, is easy to handle, and deformation of the fitting is less likely to occur during distribution and storage. The lower limit and the upper limit of the width of the first base material 11 can be arbitrarily combined. For example, it is preferably 3 mm or more and 40 mm or less.

[0022] Since it is easy to obtain sufficient sealing strength when heat-sealing to the bag body, the thickness of the first base material 11 is preferably 0.1 mm or more, more preferably 0.12 mm or more. Since the first base material 11 has excellent flexibility and is easy to handle, the thickness is preferably 0.4 mm or less, more preferably 0.3 mm or less. The lower limit and the upper limit of the thickness of the first base material 11 can be arbitrarily combined. For example, a thickness of 0.12 mm or more and 0.3 mm or less is preferable.

[0023] Since it suppresses the generation of curl, the thickness of the intermediate layer 15 is preferably 0.02 mm or more, more preferably 0.05 mm or more. Since it has good point-sealing properties (suppresses the generation of pinholes in the crushed portion in the point-sealing process of crushing the fitting when forming the side-sealing portion of the package body), the thickness of the intermediate layer 15 is preferably 0.3 mm or less, more preferably 0.2 mm or less. The lower limit and the upper limit of the thickness of the intermediate layer 15 can be arbitrarily combined. For example, a thickness of 0.05 mm or more and 0.2 mm or less is preferable.

[0024] Since it has sufficient rigidity, the thickness of the main layer 13 of the portion where the intermediate layer 15 is provided in the first base material 11 is preferably 0.01 mm or more, more preferably 0.03 mm or more. Since the main layer 13 has excellent flexibility and is easy to handle, the thickness is preferably 0.4 mm or less, more preferably 0.3 mm or less. The lower limit and the upper limit of the thickness of the main layer 13 can be arbitrarily combined. For example, a thickness of 0.03 mm or more and 0.3 mm or less is preferable.

[0025] Since it has sufficient rigidity and it is easy to obtain sufficient sealing strength when heat-sealing to the bag body, the thickness of the main layer 13 of the portion where the intermediate layer 15 is not provided in the first base material 11 is preferably 0.1 mm or more, more preferably 0.12 mm or more. Since the main layer 13 has excellent flexibility and is easy to handle, the thickness is preferably 0.4 mm or less, more preferably 0.3 mm or less. The lower limit and the upper limit of the thickness of the main layer 13 can be arbitrarily combined. For example, a thickness of 0.12 mm or more and 0.3 mm or less is preferable.

[0026] Since it is easy to obtain sufficient sealing strength when the sealing layer 14 is heat-sealed to the bag body, the thickness of the sealing layer 14 is preferably 0.01 mm or more, more preferably 0.02 mm or more. Since the sealing layer 14 has excellent flexibility and is easy to handle, the thickness is preferably 0.2 mm or less, more preferably 0.1 mm or less. The lower limit and the upper limit of the thickness of the sealing layer 14 can be arbitrarily combined. For example, a thickness of 0.02 mm or more and 0.1 mm or less is preferable.

[0027] The second base material 21 has the same configuration as the first base material 11, and includes a main layer 23, a sealing layer 24 provided on the side opposite to the female fitting portion 22 of the main layer 23, and an intermediate layer 25 provided between the main layer 23 and the sealing layer 24.

[0028] The intermediate layer 25 of the second base material 21 is not provided in the region 30 where the male fitting portion 12 and the female fitting portion 22 in the width direction of the second base material 21 are present, and is disposed in the regions 31 and 32 on both sides thereof, respectively. By not providing the intermediate layer 25 in the region 30 where the fitting portion of the second base material 21 is present, the occurrence of curl in the female fitting member 20 is suppressed.

[0029] The widthwise distance d between the fitting portion side end of the intermediate layer 25 in the region 31 (the region on the right side of the region 30 in FIG. 2) on one end side where the fitting portion in the width direction of the second base material 21 does not exist and the female fitting portion 22 3 The preferable lower limit and upper limit of are the same as the preferable range of the preferable lower limit and upper limit of the distance d 1 The widthwise distance d between the fitting portion side end of the intermediate layer 25 in the region 32 (the region on the left side of the region 30 in FIG. 2) on the other end side where the fitting portion in the width direction of the second base material 21 does not exist and the female fitting portion 22 4 The preferable lower limit and upper limit of are also the same as the preferable range of the preferable lower limit and upper limit of the distance d 1 The preferable lower limit and upper limit of are the same as the preferable range of the preferable lower limit and upper limit of the distance d

[0030] In the example shown in FIG. 2, in any of regions 31 and 32 where there is no fitting portion of the second base material 21, the position of the end on the side opposite to the fitting portion of the intermediate layer 25 coincides with the end of the second base material 21. Note that the present invention is not limited to this embodiment, and the end on the side opposite to the fitting portion of the intermediate layer 25 may be located closer to the fitting portion side than the end of the second base material 21. The distance in the width direction between the end on the side opposite to the fitting portion of the intermediate layer 25 and the end of the second base material 21 is preferably 1 mm or less, and particularly preferably 0 mm.

[0031] The materials for forming the main layer 23, the seal layer 24, and the intermediate layer 25 are not particularly limited, and the same materials as those exemplified as the materials for forming the main layer 13, the seal layer 14, and the intermediate layer 15 can be exemplified, and the preferred embodiments are also the same. The materials for forming the intermediate layer 25 in region 31 and the intermediate layer 25 in region 32 may be the same or different.

[0032] The main layer 23, the seal layer 24, and the intermediate layer 25 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, molding aids, and colorants, as necessary. The materials for forming the main layer 13, the seal layer 14, and the intermediate layer 15 and the materials for forming the main layer 23, the seal layer 24, and the intermediate layer 25 may be the same or different, respectively.

[0033] The preferred width of the second base material 21 is the same as the preferred width of the first base material 11. The width of the first base material 11 and the width of the second base material 21 may be the same or different. The preferred thicknesses of the second base material 21, the main layer 23, the seal layer 24, and the intermediate layer 25 are the same as the preferred thicknesses of the first base material 11, the main layer 13, the seal layer 14, and the intermediate layer 15. The thicknesses of the first base material 11, the main layer 13, the seal layer 14, and the intermediate layer 15 and the thicknesses of the second base material 21, the main layer 23, the seal layer 24, and the intermediate layer 25 may be the same or different, respectively.

[0034] In the entire fitting, the mass ratios of the main layer, the seal layer, and the intermediate layer are preferably such that, with respect to the total mass of the fitting, the main layer is 10% by mass or more and 90% by mass or less, the seal layer is 5% by mass or more and 30% by mass or less, and the intermediate layer is 5% by mass or more and 60% by mass or less (total is 100% by mass). More preferably, the main layer is 50% by mass or more and 70% by mass or less, the seal layer is 10% by mass or more and 20% by mass or less, and the intermediate layer is 10% by mass or more and 45% by mass or less (total is 100% by mass). If the mass ratios of the main layer, the seal layer, and the intermediate layer are within the above ranges, it becomes easier to suppress the occurrence of curling while suppressing delamination between layers.

[0035] In the fitting 1, at the cut surface obtained by cutting the fitting 1 in the mated state perpendicular to the longitudinal direction, the curl angle θ of the male fitting member 10 obtained by the method (1) described below 1 and the curl angle θ of the female fitting member 20 obtained by the method (2) described below 2 are both 0.5° or more and 20° or less. That is, in the fitting 1, the occurrence of curling is sufficiently suppressed. Also, for the angles θ 1max (mm), θ 1min (mm), θ 2max (mm), and θ 2min (mm) obtained by the methods (1) and (2) described below, similar ranges are preferable.

[0036] The curl angle θ 1 is 0.5° or more and, since it has sufficient flexibility, 2° or more is preferable and 3° or more is more preferable. On the other hand, the curl angle θ 1 is 20° or less and, since the fitting can be stably attached to the bag body during bag making, 15° or less is preferable and 10° or less is more preferable. The lower limit and the upper limit of the curl angle θ 1 can be arbitrarily combined. For example, 2° or more and 15° or less is preferable, and 3° or more and 10° or less is more preferable. Also, for θ 1max (mm) and θ 1min (mm), similar ranges are preferable.

[0037] The curl angle θ 2 is the curl angle θ1 For the same reason, it is 0.5° or more, preferably 2° or more, more preferably 3° or more. On the other hand, it is 20° or less, preferably 15° or less, more preferably 10° or less. The curl angle θ 2 The lower limit and the upper limit can be arbitrarily combined. For example, it is preferably 2° or more and 15° or less, more preferably 3° or more and 10° or less. Also, θ 2max (mm) and θ 2min (mm) preferably have the same range.

[0038] (Method (1)) Hereinafter, an example will be shown and described for the method (1) of obtaining the curl angle θ 1 As shown in FIG. 3, the fitting tool 1 in the fitted state in which the male fitting member 10 is arranged on the upper side and the female fitting member 20 is arranged on the lower side is cut perpendicular to the longitudinal direction, and the following steps (i) to (viii) are performed on the cut surface. (i) Let the center line in the width direction of the male fitting portion 12 be the straight line k1, let the intersection point of the straight line k1 and the opposite surface 11b of the surface 11a provided with the male fitting portion 12 of the first base material 11 be the point O1, and let the straight line perpendicular to the straight line k1 passing through the point O1 be the reference line k2. (ii) Let the point A1 be the position on the surface of the first base material 11 (the opposite surface 11b in the example shown in FIG. 3) on one end side of the straight line k1 of the first base material 11 (the right side of the straight line k1 in FIG. 3) where the distance from the straight line k2 is the maximum. In contrast to the example shown in FIG. 3, when one end side of the first base material 11 is curled toward the fitting portion side, the point A1 is located on the surface 11a of the first base material 11. (iii) Let the point C1 be the position of the end on one end side of the straight line k2 in the first base material 11 extended linearly along the straight line k2 (the position of the end when no curl occurs in the first base material 11 and it is linear). (iv) Measure the angle θ A1 (the angle in the direction of curling from the reference line k2) formed by the straight line a1 passing through the points A1 and O1 and the reference line k2. (v) On the other end side of the straight line k1 of the first base material 11 (the left side of the straight line k1 in FIG. 3), the position on the surface of the first base material 11 (the opposite surface 11b in the example shown in FIG. 3) where the distance from the straight line k2 is the maximum is defined as point B1. Note that, contrary to the example shown in FIG. 3, when the other end side of the first base material 11 is curled toward the fitting portion side, point B1 is located on the surface 11a of the first base material 11. (vi) In the first base material 11 in a state where the first base material 11 is linearly extended along the straight line k2, the position of the end on the other end side on the straight line k2 (the position of the end when there is no curl in the first base material 11 and it is linear) is defined as point D1. (vii) The angle θ B1 formed between the straight line b1 passing through point B1 and point O1 and the reference line k2 (viii) Measure the angle θ A1 and the angle θ B1 and take the average of them as the curl angle θ 1 . Also, among the angle θ A1 and the angle θ B1 , the larger value is taken as the maximum angle θ 1max , and the smaller value is taken as the minimum angle θ 1min .

[0039] (Method (2)) Hereinafter, an example will be shown and described for Method (2) of obtaining the curl angle θ 2 . As shown in FIG. 4, the fitting tool 1 in a fitted state where the male fitting member 10 is arranged on the upper side and the female fitting member 20 is arranged on the lower side is cut perpendicular to the longitudinal direction, and the following steps (i) to (viii) are performed on the cut surface. (i) The center line in the width direction of the female fitting portion 22 is defined as the straight line k3, the intersection point between the opposite surface 21b of the surface 21a of the second base material 21 where the female fitting portion 22 is provided and the straight line k3 is defined as point O2, and a straight line perpendicular to the straight line k3 passing through point O2 is defined as the reference line k4. (ii) Let point A2 be the position on the surface of the second substrate 21 (the opposite surface 21b in the example shown in FIG. 4) on one end side of the straight line k3 of the second substrate 21 (the right side of the straight line k3 in FIG. 4) where the distance from the straight line k4 is the maximum. Note that, contrary to the example shown in FIG. 4, when one end side of the second substrate 21 is curled toward the fitting portion side, point A2 is located on the surface 21a of the second substrate 21. (iii) Let point C2 be the position of the end on one end side of the straight line k4 in the second substrate 21 in a state where the second substrate 21 is linearly extended along the straight line k4 (the position of the end when the second substrate 21 is linear without curl). (iv) The angle θ formed by the straight line a2 passing through point A2 and point O2 and the reference line k4 A2 (the angle in the curling direction from the reference line k4) is measured. (v) Let point B2 be the position on the surface of the second substrate 21 (the opposite surface 21b in the example shown in FIG. 4) on the other end side of the straight line k3 of the second substrate 21 (the left side of the straight line k3 in FIG. 4) where the distance from the straight line k4 is the maximum. Note that, contrary to the example shown in FIG. 4, when the other end side of the second substrate 21 is curled toward the fitting portion side, point B2 is located on the surface 21a of the second substrate 21. (vi) Let point D2 be the position of the end on the other end side of the straight line k4 in the second substrate 21 in a state where the second substrate 21 is linearly extended along the straight line k4 (the position of the end when the second substrate 21 is linear without curl). (vii) The angle θ formed by the straight line b2 passing through point B2 and point O2 and the reference line k4 B2 (the angle in the curling direction from the reference line k4) is measured. (viii) The average of the angle θ A2 and the angle θ B2 is defined as the curl angle θ 2 . Also, among the angle θ A2 and the angle θ B2 , the larger value is defined as the maximum angle θ 2max , and the smaller value is defined as the minimum angle θ 2min .

[0040] The fitting tool 1 has, on a cut surface obtained by cutting the fitting tool 1 in the mated state perpendicular to the longitudinal direction, the position D of the end of the male fitting member 10 obtained by the method (3) described later 3 and the position D of the end of the female fitting member 20 obtained by the method (4) described later 5 are both preferably -1.8 mm or more and +0.75 mm or less. Thereby, the fitting tool 1 is further suppressed in the generation of curl. Also, the position D 3max (mm), D 3min (mm), D 5max (mm) and D 5min (mm) are also preferably in the same range.

[0041] The position D of the end of the male fitting member 3 is preferably -1.8 mm or more and +0.75 mm or less, more preferably -1.5 mm or more and +0.5 mm or less, and still more preferably -1.0 mm or more and -0.01 mm or less, because if the curl is too large, the attachment to the bag body will not be stable or wrinkles will occur during adhesion. In particular, if there is too much curl on the side opposite to the side where the fitting portion is provided, the bag body cannot be adhered well. Also, D 3max (mm) and D 3min (mm) are also preferably in the same range.

[0042] The position D of the end of the female fitting member 5 is preferably -1.8 mm or more and +0.75 mm or less, more preferably -1.5 mm or more and +0.5 mm or less, and still more preferably -1.0 mm or more and -0.01 mm or less for the same reason as the position D 3 . Also, D 5max (mm) and D 5min (mm) are also preferably in the same range.

[0043] (Method (3)) Hereinafter, the position D of the end of the male fitting member 3A method (3) for obtaining a certain value will be described with an example. As shown in FIG. 5, the fitting tool 1 in a fitted state where the male fitting member 10 is arranged on the upper side and the female fitting member 20 is arranged on the lower side is cut perpendicular to the longitudinal direction, and the following procedures (i) to (vi) are performed on the cut surface. (i) Let the center line in the width direction of the male fitting portion 12 be the straight line k1, let the intersection point of the straight line k1 and the opposite surface 11b of the surface 11a provided with the male fitting portion 12 of the first base material 11 be the point O1, and let the straight line perpendicular to the straight line k1 passing through the point O1 be the reference line k2. (ii) On one end side of the straight line k1 of the first base material 11 (the right side of the straight line k1 in FIG. 5), let the position farthest from the reference line k2 at the end of the male fitting member 10 be the point A3. (iii) Measure the distance D A3 (mm) between the point A3 and the reference line k2. However, with respect to the reference line k2, the region where the male fitting portion 12 is located is defined as + (plus), and the region on the opposite side of the region where the male fitting portion 12 is located with respect to the reference line k2 is defined as - (minus). That is, the distance D A3 is a - (minus) value when one end side of the first base material 11 is curled to the side opposite to the male fitting portion 12 side, and is a + (plus) value when it is curled to the male fitting portion 12 side. (iv) On the other end side of the straight line k1 of the first base material 11 (the left side of the straight line k1 in FIG. 5), let the position farthest from the reference line k2 at the end of the male fitting member 10 be the point B3. (v) Measure the distance D B3 (mm) between the point B3 and the reference line k2. However, the plus and minus of the distance D B3 are the same as those of the distance D A3 described above. (vi) Obtain the average of the distance D A3 and the distance D B3 , and let the average value be the position D 3 (mm) of the end of the male fitting member 10 with respect to the reference line k2. Also, among the distance D A3 and the distance D B3 , let the one with the farther distance from the reference line k2 be D 3max (mm) 、 and the one with the closer distance from the reference line k2 be D 3min (mm).

[0044] (Method (4)) Next, an example of a method (4) for obtaining the position D of the end of the female-side fitting member will be shown and explained. As shown in FIG. 6, the fitting tool 1 in the fitted state where the male-side fitting member 10 is arranged on the upper side and the female-side fitting member 20 is arranged on the lower side is cut perpendicular to the longitudinal direction, and the following procedures (i) to (vi) are performed on the cut surface. 5 (i) Let the center line in the width direction of the female-side fitting portion 22 be the straight line k3, the intersection point of the opposite surface 21b of the surface 21a provided with the female-side fitting portion 22 of the second base material 21 and the straight line k3 be the point O2, and the straight line perpendicular to the straight line k3 passing through the point O2 be the reference line k4. (ii) On one end side of the straight line k3 of the second base material 21 (the right side of the straight line k3 in FIG. 6), the position farthest from the reference line k4 at the end of the female-side fitting member 20 is set as the point A5. (iii) Measure the distance D (mm) between the point A5 and the reference line k4. However, with respect to the reference line k4, the region where the female-side fitting portion 22 is located is set as + (plus), and the region on the opposite side of the region where the female-side fitting portion 22 is located with respect to the reference line k4 is set as - (minus). That is, the distance D A5 is a - (minus) value when one end side of the second base material 21 is curled to the side opposite to the female-side fitting portion 22 side, and is a + (plus) value when curled to the female-side fitting portion 22 side. A5 (iv) On the other end side of the straight line k3 of the second base material 21 (the left side of the straight line k3 in FIG. 6), the position farthest from the reference line k4 at the end of the female-side fitting member 20 is set as the point B5. (v) Measure the distance D B5 (mm) between the point B5 and the reference line k4. However, the plus and minus of the distance D B5 are the same as those of the distance D A5 . (vi) Obtain the average of the distance D A5 and the distance D B5 , and set the average value as the position D 5 (mm) of the end of the female-side fitting member 20 with respect to the reference line k4. Also, among the distance D A5 and the distance D B5 , the one with the farther distance from the reference line k4 is D 5max(mm) 、 Let D be the one with a shorter distance from the reference line k4. 5min be (mm).

[0045] (Manufacturing method) The manufacturing method of the fitting 1 is not particularly limited except that the intermediate layers 15 and 25 are provided in the regions 31 and 32 of the first base material 11 and the second base material 21, and known methods can be used. For example, resin materials for forming the main layer, the seal layer, and the intermediate layer are respectively prepared by melt-kneading or the like, and co-extrusion using an extruder equipped with a composite profile die for forming a male fitting member or a female fitting member having a multilayer structure with an intermediate layer in a specific region can be exemplified.

[0046] Examples of the material mixing method include dry mixing using a super mixer, a Henschel mixer, or the like. Examples of the melt-kneading method include a method of supplying raw materials to a melt-kneading machine such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader, or a mixing roll and performing melt-kneading. Examples of the molding method include an extrusion molding method, an injection molding method, an inflation molding method, a vacuum molding method, and the like.

[0047] Note that the fitting of the present invention is not limited to the fitting 1 described above. For example, in the example shown in FIG. 2, the seal layer is provided over the entire width direction of the first base material and the second base material, but is not limited to this aspect. The seal layer may not be provided in the regions where the male fitting portion and the female fitting portion in the width direction of the first base material and the second base material are present, and may be disposed in the regions on both sides thereof. Thereby, the occurrence of curl in the female fitting member 20 is further suppressed. The preferred aspect of the arrangement of the seal layer in this case is the same as the preferred arrangement of the intermediate layers 15 and 25 in the fitting 1 described above.

[0048] [Bag body with fitting] The bag body with a fitting of the present invention is a bag body with a fitting including the fitting of the present invention. The bag body with a fitting of the present invention can adopt a known aspect except that it includes the fitting of the present invention. Hereinafter, a bag body with a fitting according to an example of an embodiment will be described.

[0049] The bag body 100 with a fitting in the example shown in FIG. 7 (hereinafter, also simply referred to as "bag body 100") includes a bag main body 50 that houses the contents, and a fitting 1 attached to the inner surface of the upper part inside the bag main body 50.

[0050] The bag main body 50 has a rectangular shape in a view from the front. The fitting 1 is provided on the inner surface of the upper side of the bag main body 50 so as to extend in the short side direction of the bag main body 50. Note that the shape of the bag main body 50 is not limited to a rectangle.

[0051] The bag main body 50 is sealed in a state where the contents (not shown) are enclosed. The bag main body 50 is obtained by overlapping a first film material 52 and a second film material 54 and heat-sealing all the peripheral edges 56 on the four sides. At the peripheral edge 56, both ends of the fitting 1 are heat-sealed together with the first film material 52 and the second film material 54.

[0052] The first film material 52 and the second film material 54 may be any materials that can weld the fitting 1 by heat-sealing, and a laminated film having at least a sealant layer and a base material layer from the inner surface side is preferable.

[0053] Examples of the base material layer included in the laminated film include linear low-density polyethylene, low-density polyethylene, high-density polyethylene, polyester, biaxially stretched nylon, biaxially stretched polypropylene, and the like. Examples of the sealant layer included in the laminated film include linear low-density polyethylene, low-density polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer, ionomer, and the like. A functional layer such as a barrier layer may be provided in the laminated film. Also, the first film material 52 and the second film material 54 may be single-layer films composed only of a sealant layer.

[0054] The bag main body 50 is provided with a cutting auxiliary line 58 along the fitting 1 on the side above the fitting 1. The cutting auxiliary line 58 is a portion where processing for assisting the cutting of the bag body 50 is linearly applied. Examples of the cutting auxiliary line 58 include weakened lines provided at the portions of the cutting auxiliary line 58 in the first film material 52 and the second film material 54. The weakened line can be formed by providing a portion of the film material that is thinner than the surrounding area. In addition, the weakened line can also be formed by perforations or a row of formed pores. Further, the cutting auxiliary line 58 is not limited to the weakened line, and may be a line formed by printing or the like that indicates the position to be cut with scissors, a cutter, or the like.

[0055] Notches 60 are formed at the ends of the cutting auxiliary line 58 in the peripheral portion 56. The shape of the notches 60 is not particularly limited, and triangular or semi-circular cutouts can be adopted. Further, the notches 60 may be incisions provided in the peripheral portion 56.

[0056] FIG. 8 is a schematic perspective view showing the state where the bag body 100 is opened. The bag body 100 can be provided with an end portion 50b that is not heat-sealed at the upper part by cutting and removing the upper part of the bag body 50 along the cutting auxiliary line 58 from the notches 60. The bag body 100 can be opened by opening the end portion 50b to form an opening 62. The opening 62 formed in the bag body 100 can be repeatedly opened and closed by attaching and detaching the male-side fitting member 10 and the female-side fitting member 20 of the fitting tool 1.

[0057] As described above, the preferred embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to such examples. The various shapes and combinations of the constituent members shown in the above examples are merely examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

Example

[0058] Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited by the following description.

[0059] [Raw materials] The raw materials used in this example are shown below. MFR is a value measured in accordance with JIS K 7210-1 under the conditions of temperature: 190°C and load: 2.16 kg. LDPE1: Low-density polyethylene, MFR = 4.0 g / 10 min, density 924 kg / cm 3 , melting point 113°C. LDPE2: Low-density polyethylene, MFR = 5.0 g / 10 min, density 921 kg / cm 3 , melting point 108°C. LLDPE1: Linear low-density polyethylene, MFR = 15.0 g / 10 min, density 910 kg / cm 3 , melting point 124°C. LLDPE2: Linear low-density polyethylene, MFR = 3.5 g / 10 min, density 915 kg / cm 3 , melting point 126°C. LLDPE3: Linear low-density polyethylene, MFR = 8.5 g / 10 min, density 916 kg / cm 3 , melting point 120°C. LLDPE4: Linear low-density polyethylene, MFR = 12.1 g / 10 min, density 884 kg / cm 3 , melting point 71°C. HDPE1: High-density polyethylene, MFR = 8.0 g / 10 min, density 964 kg / cm 3 , melting point 131°C.

[0060] [Evaluation method] (Occurrence of curl) The presence or absence of curl of the fitting produced in each example was visually confirmed, and the adhesion to the bag body during bag making was evaluated according to the following evaluation criteria. 〇: The curl is small and the appearance during bag making is nice. △: Curl occurs but adhesion to the bag body is possible. ×: The curl is large and cannot adhere to the bag body.

[0061] (Curl angle) For the fitting produced in each example, the curl angle θ of the male fitting member and the curl angle θ of the female fitting member were measured by the aforementioned methods (1) and (2). 1 and the curl angle θ of the female fitting member2 was obtained. Also, the maximum angle θ 1max、 θ 2max and the minimum angle θ 1min、 θ 2min were obtained.

[0062] (Position of the end of the fitting member) For the fittings produced in each example, the positions D of the ends of the male fitting member were determined by the aforementioned methods (3) and (4), 3 and the positions D of the ends of the female fitting member 5 were determined. Also, the position D where the distance from the reference line k2 is maximum 3max、 D 5max and the position D where the distance from the reference line k4 is minimum 3min (mm), D 5min were determined.

[0063] (Interlayer peeling) For the fittings produced in each example, the fitting was attached to the bag body, and a repeated opening and closing test of attaching and detaching the fitting by hand was performed 100 times. Thereafter, observation was carried out with a microscope to confirm the presence or absence of interlayer peeling, and evaluation was made according to the following evaluation criteria. ○: No interlayer peeling occurred. ×: Interlayer peeling occurred.

[0064] [Example 1] A composite profiled die for forming a male fitting member and a female fitting member having the same three-layer structure as the fitting 1 illustrated in FIGS. 1 and 2 was prepared. As the resin material X-1 for forming the main layer, 40 parts by mass of LDPE1, 40 parts by mass of LLDPE1, and 20 parts by mass of LLDPE2 were melt-kneaded using an extruder with a diameter of 50 mm and an L / D of 30 under the condition of a molding temperature of 170°C. As the resin material Y-1 for forming the seal layer, LDPE4 was melt-kneaded using an extruder with a diameter of 30 mm and an L / D of 30 under the condition of a molding temperature of 170°C. As the resin material Z-1 for forming the intermediate layer, HDPE1 was melt-kneaded using an extruder with a diameter of 30 mm and an L / D of 30 under the condition of a molding temperature of 190°C. The resin materials X-1, Y-1, and Z-1 were introduced into a composite profiled die and extruded. Thereafter, they were introduced into a cooling water tank to be cooled and solidified, thereby obtaining a fitting with a tape width of 13 mm and a total thickness of 0.15 mm for each of the first substrate and the second substrate. In each of the first substrate and the second substrate, the mass ratio of the main layer, the intermediate layer, and the seal layer was 60:30:10.

[0065] [Comparative Example 1] The resin material X for forming the main layer and the resin material Y for forming the seal layer were changed as shown in Table 1. A fitting was produced in the same manner as in Example 1 except that no intermediate layer was provided, the mass ratio of the main layer and the seal layer was 80:20, and the molding temperatures of the main layer and the seal layer were 170°C.

[0066] [Comparative Example 2] A fitting was produced in the same manner as in Example 1 except that an intermediate layer was provided throughout the width direction of the first substrate and the second substrate, that is, an intermediate layer was also provided in the regions where the male fitting portion and the female fitting portion exist.

[0067] The compositions of the main layer, the intermediate layer, and the seal layer of each example, and the evaluation results are shown in Table 1.

[0068]

Table 1

[0069] As shown in Table 1, the fitting of Example 1 having a three-layer structure with intermediate layers provided on both sides of the regions where the male fitting portion and the female fitting portion of the first substrate and the second substrate exist had no delamination between layers, a small curl angle, and the occurrence of curl was suppressed. On the other hand, the fitting of Comparative Example 1 without an intermediate layer and the fitting of Comparative Example 2 with an intermediate layer provided throughout the first substrate and the second substrate had no delamination between layers, but had a large curl angle and could not sufficiently suppress the occurrence of curl.

Explanation of Signs

[0070] 1…Fitting, 10…Male fitting member, 11…First base material, 11a…Surface, 11b…Opposite surface, 12…Male fitting portion, 13…Main layer, 14…Sealing layer, 15…Intermediate layer, 20…Female fitting member, 21…Second base material, 21a…Surface, 21b…Opposite surface, 22…Female fitting portion, 23…Main layer, 24…Sealing layer, 25…Intermediate layer, 30 - 32…Regions, 50…Bag body, 100…Bag with fitting.

Claims

1. A fitting tool comprising a male fitting member provided with a male fitting portion along the longitudinal direction on the surface of a strip-shaped first base material, and a female fitting member provided with a female fitting portion 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 to each other, each of the first base material and the second base material includes a main layer, a seal layer provided on the side opposite to the male fitting portion and the female fitting portion of the main layer, and an intermediate layer provided between the main layer and the seal layer, the intermediate layer is disposed in each of the first base material and the second base material in regions on both sides of the region where the male fitting portion and the female fitting portion exist in the width direction thereof, In a cut surface obtained by cutting the fitting in the mated state perpendicular to the longitudinal direction, the curl angle θ of the male fitting member obtained by the following method (1) １ and the curl angle θ of the female fitting member obtained by the following method (2) ２ are both 0.5° or more and 20° or less, At the cut surface obtained by cutting the fitting in the mated state perpendicular to the longitudinal direction, the position D of the end of the male fitting member obtained by the following method (3) ３ and the position D of the end of the female fitting member obtained by the following method (4) ５ are both -1.8 mm or more and +0.75 mm or less, the fitting. Method (1): Let the center line in the width direction of the male fitting portion be a straight line k1, let the intersection point of the opposite surface of the surface of the first base material where the male fitting portion is provided and the straight line k1 be a point O1, and let a straight line perpendicular to the straight line k1 passing through the point O1 be a reference line k2. Let a position on one end side of the straight line k1 of the first base material where the distance from the reference line k2 on the surface of the first base material is the maximum be a point A1. Let the position of the end on the one end side on the reference line k2 in the first base material in a state where the first base material is linearly extended along the reference line k2 be point C1. Measure the angle θ Ａ１ (the angle in the direction of curling from the reference line) formed by the straight line passing through point A1 and point O1 and the reference line k2. Ａ１ (The angle in the direction of curling from the reference line) is measured. Let a position on the other end side of the straight line k1 of the first base material where the distance from the reference line k2 on the surface of the first base material is the maximum be a point B1. Let the position of the end on the other end side on the reference line k2 in the first base material in a state where the first base material is linearly extended along the reference line k2 be point D1. Measure the angle θ Ｂ１ (the angle in the direction of curling from the reference line) formed by the straight line passing through point B1 and point O1 and the reference line k2. Ｂ１ (the angle in the direction of curling from the reference line). Angle θ Ａ１ and the angle θ Ｂ１ whose average is defined as the curl angle θ １ shall be used. Method (2): Let the center line in the width direction of the female fitting portion be a straight line k3, let the intersection point of the opposite surface of the surface of the second base material where the female fitting portion is provided and the straight line k3 be a point O2, and let a straight line perpendicular to the straight line k3 passing through the point O2 be a reference line k4. Let a position on one end side of the straight line k3 of the second base material where the distance from the reference line k4 on the surface of the second base material is the maximum be a point A2. Let the position of the end on the one end side on the reference line k4 in the second base material in a state where the second base material is linearly extended along the reference line k4 be a point C2. The angle θ formed by the straight line passing through the point A2 and the point O2 and the reference line k4 Ａ２ (the angle in the direction of curling from the reference line) is measured. Let a position on the other end side of the straight line k3 of the second base material where the distance from the reference line k4 on the surface of the second base material is the maximum be a point B2. In the second base material in a state where the second base material is linearly extended along the reference line k4, the position of the end on the other end side on the reference line k4 is defined as point D2. The angle θ Ｂ２ (the angle in the direction of curling from the reference line) formed by the straight line passing through point B2 and point O2 and the reference line k4 is measured. Angle θ Ａ２ and the angle θ Ｂ２ the average of which is the curl angle θ ２ shall be taken as such. Method (3): Let the center line in the width direction of the male fitting portion be a straight line k1, let the intersection point of the opposite surface of the surface of the first base material where the male fitting portion is provided and the straight line k1 be a point O1, and let a straight line perpendicular to the straight line k1 passing through the point O1 be a reference line k2. Let a position on one end side of the straight line k1 of the first base material, which is the position farthest from the reference line k2 at the end of the male fitting member, be a point A3. The distance D between the point A3 and the reference line k2 Ａ３ is measured (mm) (wherein, with respect to the reference line k2, the region where the male fitting portion is located is defined as + (plus), and with respect to the reference line k2, the region on the opposite side of the region where the male fitting portion is located is defined as - (minus)). On the other end side of the straight line k1 of the first base material, let point B3 be the position farthest from the reference line k2 at the end of the male fitting member. The distance D between the point B3 and the reference line k2 Ｂ３ is measured (mm) (where plus and minus are the same as the distance D Ａ３ .). the distance D Ａ３ and the distance D Ｂ３ are averaged, and the average value is taken as the position D ３ of the end of the male fitting member with respect to the reference line k2 Method (4): Let the center line in the width direction of the female fitting portion be the straight line k3, let point O2 be the intersection point of the straight line k3 and the opposite surface of the surface of the second base material where the female fitting portion is provided, and let the straight line perpendicular to the straight line k3 passing through the point O2 be the reference line k4. On one end side of the straight line k3 of the second base material, let point A5 be the position farthest from the reference line k4 at the end of the female fitting member. The distance D between the point A5 and the reference line k4 Ａ５ is measured (mm) (however, with respect to the reference line k4, the region where the female fitting portion is located is defined as + (plus), and the region on the opposite side of the region where the female fitting portion is located with respect to the reference line k4 is defined as - (minus)). On the other end side of the straight line k3 of the second base material, let point B5 be the position farthest from the reference line k4 at the end of the female fitting member. The distance D between the point B5 and the reference line k4 Ｂ５ is measured (mm) (however, the plus and minus signs are the same as for the distance D Ａ５ ). the distance D Ａ５ and the distance D Ｂ５ to obtain an average thereof, and set the average value as the position D ５ of the end of the female fitting member with respect to the reference line k4

2. The fitting tool according to claim 1, wherein the seal layer is disposed in each of the first base material and the second base material in regions on both sides of the region where the male fitting portion and the female fitting portion exist in the width direction thereof.

3. At the cut surface obtained by cutting the fitting in the mated state perpendicular to the longitudinal direction, the position D of the end of the male fitting member determined by the method (3) ３ and the position D of the end of the female fitting member determined by the method (4) ５ are both -1.5 mm or more and -0.01 mm or less. The fitting according to claim 1 or 2

4. A fitting tool according to any one of claims 1 to 3, and a bag body for containing contents, A bag body with a fitting tool, wherein the fitting tool is attached to the inner surface of the bag body.

Images