Fitting tool and bag body with fitting tool

Abstract

To provide a fitting tool having an excellent point sealing properties of sufficiently crushing fitting parts even at 190°C or less, and capable of suppressing defects caused by the fitting parts at side seal parts during bag manufacturing, and a bag body with a fitting tool using the fitting tool.SOLUTION: A fitting tool includes a first fitting member and a second fitting member each having a male fitting part or a female fitting part provided along a longitudinal direction on a surface of a belt-shaped base material. A film with a fitting tool is formed by bonding a film to an outer surface of each of base materials of the fitting tool in a fitted state. When the film with the fitting tool is pressed at 0.2 MPa for 1.0 second at 150°C, 170°C, or 190°C and a change in thickness of the fitting parts is measured, (A) a thickness change rate after pressing at 170°C relative to an initial thickness is -99 to -70%, and (B) when a graph plotting press temperature (°C) is on a horizontal axis and thickness change rate (%) is on a vertical axis, a slope (b) from 170°C to 190°C is larger than a slope (a) from 150°C to 170°C.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fitting and a bag with a fitting. [Background technology]

[0002] BACKGROUND ART Bags with fittings, in which a fitting that seals the opening so that it can be opened and closed is attached to the inner surface of the bag body near the opening, are widely used in various fields such as food, medicine, and miscellaneous goods. The fitting device generally comprises a first fitting member having a male fitting portion provided along the longitudinal direction on the surface of a strip-shaped base material, and a second fitting member having a female fitting portion provided along the longitudinal direction on the surface of a strip-shaped base material.

[0003] In a bag with a fitting, in which such a fitting is provided at the opening of the bag body, the opening of the bag body can be closed after opening by fitting the male fitting portion and female fitting portion of the fitting together. The bag can also be reopened by grasping each open end of the bag body to which the fitting is attached and pulling them apart to release the engagement between the male fitting portion and the female fitting portion.

[0004] When the fitting is welded to the bag body to form the bag, the film material of the bag body is side-sealed together with the fitting at the side edge of the bag body. In the area of ​​the side seal portion of the bag body where the fitting is located, the protrusions of the male and female fitting portions are likely to cause defects such as pinholes, wrinkles, and deformation in the film material of the bag body. Furthermore, the protrusions of the fitting portions may cause printing cracks, or aluminum cracks in bag films with an aluminum layer on the inner surface. Therefore, before the side sealing process, a point sealing process is performed to pre-compress the side-sealed portions of the male and female fitting portions of the fitting. However, if the fitting portions are not sufficiently compressed in the point sealing process, defects such as pinholes, wrinkles, deformation, printing cracks, and aluminum cracks cannot be fully suppressed. Therefore, a fitting with excellent point sealing properties at low temperatures is needed. Fittings that can be point-sealed at temperatures of 200°C or less are particularly preferred.

[0005] Patent document 1 discloses that by using linear low-density polyethylene for the base material layer that is continuous with the mating portion of the strip-shaped base material of the mating device, it is possible to maintain airtightness at the joint between the resin that spreads as the mating portion is crushed by the point seal at the side end of the bag body and the resin of the layer facing the inner surface of the bag body. Patent Document 2 discloses that a polypropylene resin having a predetermined melting enthalpy at 120° C. is used in the fitting portion in order to shorten or eliminate the point sealing process. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2016 / 159148 [Patent Document 2] International Publication No. 2020 / 067008 Summary of the Invention [Problem to be solved by the invention]

[0007] In Patent Documents 1 and 2, point sealing is performed at 190°C or below, but the extent to which the thickness of the portion where the fitting part of the fitting is located is reduced near the point sealing temperature is not considered. Therefore, it is unclear whether the techniques in Patent Documents 1 and 2 complete the crushing of the fitting part at a point sealing temperature of 190°C or below and whether further thickness change occurs. Furthermore, even if the melting peak temperature, which is the melting point of the resin, is the same value, the melting start temperature, melting end temperature, and melting peak shape vary depending on the crystallinity of the resin and the content of multiple resins, making it difficult to evaluate the crushability of point sealing based on melting point alone.

[0008] The main object of the present invention is to provide a fitting that has excellent point sealing properties that allow the fitting portion to be sufficiently crushed even at temperatures below 190°C, and that can prevent pinholes, wrinkles, deformation, printing cracks, aluminum cracks, etc., from occurring in the side seal portion due to protrusions in the fitting portion during bag production, and to provide a bag body with a fitting that uses the above fitting. [Means for solving the problem]

[0009] The present invention includes the following aspects. [1] A fitting device comprising a first fitting member having a male fitting portion provided along the longitudinal direction on the surface of a belt-shaped first base material, and a second fitting member having a female fitting portion provided along the longitudinal direction on the surface of a belt-shaped second base material, wherein the male fitting portion and the female fitting portion are detachably fitted together, A film with a fitting is produced by bonding a film to the outer surface of the first substrate and the second substrate while the male fitting portion and the female fitting portion are fitted together, and the fitting portions of the male fitting portion and the female fitting portion are pressed from the outer surface of the film for 1.0 second at a press temperature of 150°C, 170°C or 190°C and a press pressure of 0.2 MPa, and when the change in thickness of the fitting portion of the film with a fitting is measured, a fitting that satisfies the following conditions (A) and (B): (A) When the initial thickness (mm) of the fitting portion of the film is T1 and the thickness (mm) after pressing is T2, and the thickness change rate is calculated using the following formula, the thickness change rate after pressing at 170°C relative to the initial thickness is -99 to -70%. Thickness change rate (%) = (T2 - T1) / T1 × 100 (1) (B) In a graph plotting press temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, when the slope at 150-170°C is a and the slope at 170-190°C is b, b>a. [2] The fitting according to [1], which satisfies 0.10≦ba≦1.00. [3] The fitting film according to [1] is further measured for the change in thickness of the fitting portion of the film with fitting when the fitting portion is pressed from each outer surface of the film for 1.0 second at a press temperature of 130°C and a press pressure of 0.2 MPa, and the graph is plotted with press temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, where c is the slope from 130°C to 150°C, and the fitting satisfies -0.12≦b≦0 and -1.50≦c≦-0.35. [4] The fitting according to [1], wherein, in differential scanning calorimetry (DSC), the heat of fusion is 90 J / g or less when heated to 170°C at a heating rate of 99.9°C / min, and the heat of fusion is 90 J / g or less when heated to 190°C at a heating rate of 99.9°C / min. [5] A bag body with a fitting, comprising the fitting according to any one of [1] to [4]. [Effects of the Invention]

[0010] According to the present invention, there are provided a fitting that has excellent point sealing properties that allow the fitting portion to be sufficiently crushed even at temperatures below 190°C, and that can suppress the occurrence of pinholes, wrinkles, deformation, printing cracks, aluminum cracks, etc. that are caused by protrusions of the fitting portion in the side seal portion during bag production, and a bag body with a fitting that uses said fitting. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view schematically illustrating a fitting according to an example of an embodiment. [Figure 2] 2 is a cross-sectional view of the fitting device in the fitted state shown in FIG. 1; FIG. [Figure 3] FIG. 2 is a schematic diagram showing an example of a film with a fitting prepared in a method for measuring thickness change. [Figure 4] 1 is a front view schematically showing a bag body with a fitting according to an example of an embodiment. FIG. [Figure 5] 5 is a perspective view showing a state in which the opening of the bag with fitting of FIG. 4 has been opened. FIG. [Figure 6]1 is a graph in which the horizontal axis represents the pressing temperature (° C.) and the vertical axis represents the thickness change rate (%) in the measurements of the thickness change rates of Examples 1 to 5 and Comparative Examples 1 and 2. [Figure 7] 7 is a bar graph showing the slope a in the range of 150 to 170° C. and the slope b in the range of 170 to 190° C. in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a fitting and a bag body with a fitting according to an embodiment will be described with reference to the drawings. It should be noted that the dimensions of the figures illustrated in the following description are merely examples, and the present invention is not necessarily limited to them, and can be implemented with appropriate modifications within the scope that does not change the gist of the present invention. Unless otherwise specified, in this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits.

[0013] [Fittings] An example of the fitting of the present invention will be described in detail below. As shown in FIG. 1, the fitting 10 includes a pair of strip-shaped first and second fitting members 12 and 14. The first fitting member 12 includes a strip-shaped first base material 16 and a male fitting portion 18 provided on the first base material 16 in the longitudinal direction. The second fitting member 14 includes a strip-shaped second base material 20 and a female fitting portion 22 provided on the second base material 20 in the longitudinal direction.

[0014] As shown in FIG. 2, male fitting portion 18 has a stem 18a that rises from opposing surface 16a of first substrate 16, and a head 18b that is provided at the tip end of stem 18a and is larger than stem 18a. The female fitting portion 22 includes a pair of first and second arm portions 22a and 22b that rise in an arc-shaped cross section from an opposing surface 20a of the second base material 20 that faces the first base material 16. The female fitting portion 22 has a recess 22c formed therebetween by the first arm portion 22a and the second arm portion 22b and extending in the length direction of the second base material 20.

[0015] In the fitting 10, the head 18b of the male fitting portion 18 fits into the recess 22c of the female fitting portion 22, so that the male fitting portion 18 and the female fitting portion 22 are detachably fitted together. The shapes of the male fitting portion 18 and the female fitting portion 22 may be any shape that allows the male fitting portion 18 and the female fitting portion 22 to be detachably fitted together, and any known shape may be used.

[0016] The thickness of fitting 10 according to one example of the embodiment, when measured using the following thickness change measurement method, satisfies the following conditions (A) and (B). When fitting 10 satisfies conditions (A) and (B), the fitting portion is sufficiently crushed even at point sealing temperatures of 190°C or less, resulting in small thickness changes, and therefore, defects such as pinholes, wrinkles, deformation, printing cracks, and aluminum cracks can be suppressed in the side seal portion during bag production. In order to improve the point sealing performance, it is preferable that the fitting 10 further satisfies the condition (C) or (D) described below.

[0017] (Method for measuring thickness change) As shown in Figure 3, one film 110 is heat-sealed to each of the outer surfaces of the first substrate 16 and the second substrate 20 of the fitting 10 with the male fitting portion 18 and the female fitting portion 22 fitted together, to create the fitting-attached film 100. For example, the film 110 may be a two-layer film (thickness 0.065 mm) made of nylon (Ny) (thickness 0.015 mm) and linear low-density polyethylene (LLDPE) (thickness 0.050 mm), and in this case the LLDPE layer is heat-sealed facing the substrate side. The thickness (maximum value) of the mating portion between the male mating portion 18 and the female mating portion 22 in the obtained film with mating device 100 is measured at room temperature (25°C) and designated as the initial thickness T1 (mm). Next, the mating portion of the male mating portion 18 and the female mating portion 22 of the film with mating device 100 is pressed from the outer surfaces of each of the two films under conditions of a press temperature of 130°C, 150°C, 170°C, or 190°C, a press pressure of 0.2 MPa, and a press time of 1.0 second. The thickness (maximum value) of the mating portion of the film with mating device 100 after pressing is then measured at room temperature (25°C) and designated as the thickness after pressing T2 (mm). The thickness of the mating portion of the film with mating device is the sum of the thicknesses of the films 110 on the upper and lower outer surfaces and the thickness of the mating device 10 in the mated state.

[0018] (A) When the initial thickness (mm) of the fitting portion of the film 100 with fitting is T1 and the thickness (mm) after pressing is T2, and the thickness change rate is calculated using the formula below, the thickness change rate after pressing at 170°C relative to the initial thickness is -99 to -70%. Thickness change rate (%) = (T2 - T1) / T1 × 100 (1) (B) In a graph plotting press temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, when the slope at 150-170°C is a and the slope at 170-190°C is b, b>a. (C) 0.10≦ba≦1.00. (D) In ​​a graph plotting pressing temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, when the slope at 130°C to 150°C is c, the following conditions are satisfied: -0.12≦b≦0, -1.50≦c≦-0.35.

[0019] When the thickness of the film 110 is 0.065 mm, since the operations of fitting and unfitting are easy, the initial thickness T1 of the film 100 with fitting is preferably 1.0 mm or more, more preferably 1.2 mm or more, and even more preferably 1.4 mm or more. Furthermore, since this improves the loading rate when the bag with fitting is packed in a box such as a cardboard box for transportation, the initial thickness T1 of the film 100 with fitting is preferably 4.0 mm or less, more preferably 3.0 mm or less, and even more preferably 2.5 mm or less.

[0020] Since the thickness change rate is a negative value, the smaller the change rate value, the greater the thickness decrease, and the larger the change rate value, the smaller the thickness change. To provide excellent heat resistance, the thickness change rate after pressing at 130°C relative to the initial thickness is preferably -70% or more, more preferably -65% or more, and even more preferably -60% or more. Furthermore, to provide excellent point-sealability at 190°C or less and excellent flexibility, the thickness change rate after pressing at 130°C relative to the initial thickness is preferably -40% or less, more preferably -50% or less, and even more preferably -55% or less. The lower and upper limits of the thickness change rate after pressing at 130°C can be arbitrarily combined, and for example, -70 to -40% is preferred. The thickness change rate after pressing at 130°C can be adjusted by adjusting the resin composition and the thickness of each layer of the fitting. For example, increasing the content of low-melting-point resin or low-crystalline resin tends to significantly reduce the thickness after pressing at 130°C, resulting in a smaller thickness change rate.

[0021] Because of excellent heat resistance, the thickness change rate after pressing at 150°C relative to the initial thickness is preferably -85% or more, more preferably -80% or more, and even more preferably -75% or more. Furthermore, because of excellent point-sealing properties at 190°C or less and excellent flexibility, the thickness change rate after pressing at 150°C relative to the initial thickness is preferably -50% or less, more preferably -55% or less, and even more preferably -60% or less. The lower and upper limits of the thickness change rate after pressing at 150°C can be arbitrarily combined, and for example, -85 to -50% is preferred. The thickness change rate after pressing at 150°C can be adjusted by adjusting the resin composition and the thickness of each layer of the fitting. For example, increasing the content of low-melting-point resin or low-crystalline resin tends to significantly reduce the thickness after pressing at 150°C, resulting in a smaller thickness change rate.

[0022] Because the film has excellent point-sealing properties at 190°C or less and sufficient crushing occurs at 170°C, the thickness change rate after pressing at 170°C relative to the initial thickness is preferably -99% or more, more preferably -85% or more, and even more preferably -80% or more. For the same reasons, the thickness change rate after pressing at 170°C relative to the initial thickness is preferably -70% or less, more preferably -73% or less. The lower and upper limits of the thickness change rate after pressing at 170°C can be arbitrarily combined, and for example, -99 to -70% is preferred. The thickness change rate after pressing at 170°C can be adjusted by adjusting the resin composition and the thickness of each layer of the fitting. For example, increasing the content of low-melting-point resin or low-crystalline resin tends to significantly reduce the thickness after pressing at 170°C, resulting in a smaller thickness change rate.

[0023] Because the film has excellent point-sealing properties at 190°C or below, sufficient crushing occurs at 170°C, and thickness change at 190°C is small, the thickness change rate after pressing at 190°C relative to the initial thickness is preferably -99% or more, more preferably -85% or more, and even more preferably -80% or more. For the same reasons, the thickness change rate after pressing at 190°C relative to the initial thickness is preferably -70% or less, more preferably -73% or less, and even more preferably -75% or less. The lower and upper limits of the thickness change rate after pressing at 190°C can be arbitrarily combined, and for example, -99 to -70% is preferred. The thickness change rate after pressing at 190°C can be adjusted by adjusting the resin composition and the thickness of each layer of the fitting. For example, increasing the content of low-melting-point resin or low-crystalline resin tends to significantly reduce the thickness after pressing at 190°C, resulting in a smaller thickness change rate.

[0024] Since the slope of the thickness change rate is a negative value, the greater the change rate, the smaller the slope value. Because the male mating portion 18 and the female mating portion 22 are easily crushed sufficiently between 150 and 170°C during point sealing, ba is preferably 0.10 or more, more preferably 0.15 or more, and even more preferably 0.20 or more. Furthermore, a resin composition that does not melt at temperatures below 150°C and rapidly melts between 150 and 170°C, resulting in almost complete crushing, may have poor moldability. Therefore, to ensure good moldability, ba is preferably 1.00 or less, more preferably 0.80 or less, and even more preferably 0.70 or less. The preferred lower and upper limits of ba can be arbitrarily combined, and for example, 0.10 to 1.00 is preferred.

[0025] Since sufficient crushing occurs at press temperatures up to 170°C, and the point sealing properties are improved at temperatures below 190°C when the difference between the thickness T2 at a press temperature of 190°C and the thickness T2 at a press temperature of 170°C is small, it is more preferable that the fitting 10 satisfy b>a and b>c. Since the male fitting portion 18 and the female fitting portion 22 are easily and sufficiently crushed between 130 and 170°C during point sealing, bc is preferably 0.15 or more, more preferably 0.20 or more, and even more preferably 0.30 or more. Furthermore, fittings made from resin compositions that are completely crushed between 130 and 150°C may have poor heat resistance. Therefore, since they have excellent heat resistance, bc is preferably 1.00 or less, more preferably 0.80 or less, and even more preferably 0.70 or less. The preferred lower and upper limits of bc can be arbitrarily combined, and for example, 0.15 to 1.00 is preferred.

[0026] To provide excellent heat resistance, the slope c at 130 to 150°C is preferably -1.50 or more, more preferably -1.20 or more, and even more preferably -1.00 or more. Furthermore, to provide good point sealing properties at 190°C or less, the slope c is preferably -0.35 or less, more preferably -0.40 or less, and even more preferably -0.45 or less. The preferred lower and upper limits of the slope c can be arbitrarily combined, and for example, -1.50 to -0.35 are preferred. The slope c at 130 to 150°C can be adjusted by the resin composition and the thickness of each layer of the fitting. For example, by increasing the content of low-melting-point resin or low-crystalline resin, the value of slope c becomes smaller, and the fitting tends to be easier to crush at low temperatures.

[0027] To provide excellent heat resistance, the slope a at 150 to 170°C is preferably -1.50 or more, more preferably -1.20 or more, and even more preferably -1.00 or more. Furthermore, to provide good point sealability at temperatures below 190°C, the slope a at 150 to 170°C is preferably -0.20 or less, more preferably -0.40 or less, and even more preferably -0.45 or less. The preferred lower and upper limits of the slope a can be arbitrarily combined, and for example, -1.50 to -0.20 are preferred. The slope a at 150 to 170°C can be adjusted by the resin composition and the thickness of each layer of the fitting. For example, by increasing the content of low-melting-point resin or low-crystalline resin, the slope a becomes smaller, and the fitting tends to be easier to crush at low temperatures.

[0028] When crushing is nearly complete at 170°C or below and thickness change is small when pressed at 170 to 190°C, point sealing properties are good at 190°C or below, so the slope b at 170 to 190°C is preferably -0.12 or above, more preferably -0.10 or above, and even more preferably -0.07 or above. The upper limit of the slope b at 170 to 190°C is preferably 0 or below. The slope b at 170 to 190° C. can be adjusted by the resin composition and the thickness of each layer of the fitting. For example, by increasing the content of low-melting-point resin or low-crystalline resin, the slope b tends to approach 0.

[0029] The claw height H1 (FIG. 3) of male fitting portion 18 is preferably 0.80 mm or more, more preferably 0.85 mm or more, and even more preferably 0.90 mm or more, to facilitate easy fitting and unfitting operations. Furthermore, the claw height H1 of male fitting portion 18 is preferably 1.35 mm or less, more preferably 1.30 mm or less, and even more preferably 1.25 mm or less, to improve the loading efficiency when the fitting-equipped bag is packed in a box such as cardboard and shipped. The preferred lower and upper limits of claw height H1 of male fitting portion 18 can be arbitrarily combined, and for example, 0.80 to 1.35 mm is preferred.

[0030] The claw width W1 (Fig. 3) of the male fitting portion 18 is preferably 0.55 mm or more to ensure sufficient fitting strength, more preferably 0.60 mm or more, and even more preferably 0.65 mm or more. Furthermore, the claw width W1 of the male fitting portion 18 is preferably 1.00 mm or less to facilitate easy disengagement and reduce resin costs, more preferably 0.80 mm or less, and even more preferably 0.77 mm or less. The preferred lower and upper limits of the claw width W1 of the male fitting portion 18 can be arbitrarily combined, with a preferred range of, for example, 0.55 to 1.00 mm.

[0031] In order to improve the point sealing properties of the fitting, it is preferable that the molded male fitting portion 18 has a heat of fusion of 90 J / g or less when heated to 170°C at a heating rate of 99.9°C / min, and a heat of fusion of 90 J / g or less when heated to 190°C at a heating rate of 99.9°C / min, in differential scanning calorimetry (DSC) measurement. DSC measurements based on JIS K 7121, commonly used for resins, are performed at a heating rate of 10°C / min. However, because the temperature of the joint increases rapidly during point sealing, a heating rate of 10°C / min is too slow to accurately assess the degree of melting of the joint during the point sealing process. As a result, measurements at a heating rate of 10°C / min may not correlate well with the heat of fusion and the change in joint thickness during the point sealing process during bag production. On the other hand, DSC measurements at a heating rate of 99.9°C / min are more appropriate for assessing the degree of melting of the joint during the point sealing process. Furthermore, the melting peak of the first run was measured to measure the thermal behavior of the molded joint, rather than the melting point of the resin.

[0032] In DSC measurement of the male fitting portion 18, the heat of fusion when heated to 170°C at a heating rate of 99.9°C / min is preferably 90 J / g or less, even more preferably 85 J / g or less, and particularly preferably 80 J / g or less. There is no particular lower limit to the heat of fusion when heated to 170°C at a heating rate of 99.9°C / min, and it can be, for example, 30 J / g or more. If the heat of fusion when heated rapidly exceeds the upper limit, crystallinity will be high during the point sealing process, and there is a risk that crushing will not be complete at a press temperature of 170°C.

[0033] In DSC measurement of male fitting portion 18, the heat of fusion when heated to 190°C at a heating rate of 99.9°C / min is preferably 90 J / g or less, even more preferably 85 J / g or less, and particularly preferably 80 J / g or less. There is no particular lower limit to the heat of fusion when heated to 190°C at a heating rate of 99.9°C / min, and it can be, for example, 35 J / g or more. The heat of fusion when the temperature is raised to 170°C or 190°C at a heating rate of 99.9°C / min can be adjusted by adjusting the resin composition and the thickness of each layer of the fitting. For example, increasing the content of low-melting-point resin or low-crystalline resin tends to reduce the heat of fusion. If the heat of fusion when the temperature is raised rapidly exceeds the upper limit, the crystallinity will be high during the point sealing process, and even at a press temperature of 190°C, crushing may occur and the thickness may continue to decrease. Therefore, the point sealing temperature must be set to 200°C or higher.

[0034] Known thermoplastic resins can be used as the resin constituting the male fitting portion 18. Examples include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), polypropylene, polyester resins, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMMA), ethylene-α-olefin copolymer, and propylene-α-olefin copolymer. Among these, LLDPE, LDPE, polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMMA), ethylene-α-olefin copolymer, and propylene-α-olefin copolymer are preferred because they improve point sealing properties. The resin constituting the male fitting portion 18 may be one type or two or more types.

[0035] The first substrate 16 may be a single layer or multiple layers. When first substrate 16 is a single layer, the resin that forms first substrate 16 is preferably the same as the resin that forms male fitting portion 18. An example of the multi-layer first substrate 16 is one that includes a substrate layer and a seal layer provided on the substrate layer on the opposite side from male fitting portion 18. The resin that constitutes the substrate layer in multi-layer first substrate 16 is preferably the same as the resin that constitutes male fitting portion 18. The material that constitutes the substrate layer of first substrate 16 may be one type alone or two or more types in combination.

[0036] The material for the sealing layer is not particularly limited, and examples thereof include LDPE, LLDPE, polypropylene, ethylene-(meth)acrylic acid alkyl ester copolymer, ethylene-α-olefin copolymer, olefin-based elastomer, styrene-based elastomer, acid-modified olefin-based resin, ethylene-vinyl acetate copolymer, ionomer, and polyester resin. Among these, LLDPE is preferred from the viewpoints of flexibility and low-temperature sealing properties. The materials constituting the sealing layer may be used alone or in combination of two or more.

[0037] The multi-layer first substrate 16 may have an intermediate layer between the substrate layer and the sealing layer. The material for the intermediate layer is not particularly limited, and may be any material used as the base material for known fittings. Examples include polyethylenes such as LDPE, LLDPE, high density polyethylene (HDPE), and ethylene-α-olefin copolymers, polypropylene, ethylene-vinyl acetate copolymers, ethylene-methacrylic acid copolymers, polyester resins (polyethylene terephthalate, polyethylene naphthalate, etc.), and polyamide resins (nylon, etc.). Among these, polypropylene and polypropylene with a density of 930 kg / m are preferred because they provide sufficient rigidity to the fittings. 3 The above resins are preferred, with HDPE being particularly preferred. As the material for forming the intermediate layer, one type may be used alone, or two or more types may be used in combination.

[0038] The first substrate 16 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, and colorants, as needed.

[0039] The width of the first substrate 16 is preferably 2 mm or more, and more preferably 3 mm or more, because sufficient seal strength is easily obtained when heat-sealed to the bag body. The width of the first substrate 16 is preferably 60 mm or less, and more preferably 40 mm or less, because it is highly flexible, easy to handle, and the fitting is less likely to deform during distribution and storage. The lower and upper limits of the width of the first substrate 16 can be arbitrarily combined, and for example, a range of 2 to 40 mm is preferred.

[0040] The thickness of the first substrate 16 is preferably 0.10 mm or more, and more preferably 0.12 mm or more, because this reduces the risk of poor sealing due to the substrate breaking when heat-sealed to the bag body. The thickness of the first substrate 16 is preferably 0.40 mm or less, and more preferably 0.30 mm or less, because it is highly flexible and easy to handle. The upper and lower limits of the thickness of the first substrate 16 can be arbitrarily combined, and for example, a range of 0.10 to 0.40 mm is preferred.

[0041] The claw height H2 (FIG. 3) of the female fitting portion 22 is preferably 1.10 mm or more, more preferably 1.20 mm or more, and even more preferably 1.25 mm or more, because this facilitates easy fitting and disengagement. Furthermore, the claw height H2 of the female fitting portion 22 is preferably 1.80 mm or less, more preferably 1.75 mm or less, and even more preferably 1.60 mm or less, because this improves the loading efficiency when the bag with fitting is packed in a box such as a cardboard box and transported. The preferred lower and upper limits of the claw height H2 of the female fitting portion 22 can be arbitrarily combined, and for example, 1.10 to 1.80 mm are preferred.

[0042] The claw width W2 (FIG. 3) of the female fitting portion 22 is preferably 1.20 mm or more, more preferably 1.25 mm or more, and even more preferably 1.30 mm or more, from the viewpoint of ease of disengagement. The claw width W2 of the female fitting portion 22 is preferably 1.70 mm or less, more preferably 1.65 mm or less, and even more preferably 1.60 mm or less, from the viewpoint of providing sufficient fitting strength and reducing the cost of resin. The preferred lower and upper limits of the claw width W2 of the female fitting portion 22 can be arbitrarily combined, and for example, 1.20 to 1.70 mm are preferred.

[0043] As with the male fitting portion 18, the molded female fitting portion 22 preferably has a heat of fusion of 90 J / g or less when heated to 170°C at a heating rate of 99.9°C / min, and a heat of fusion of 90 J / g or less when heated to 190°C at a heating rate of 99.9°C / min, as measured by differential scanning calorimetry (DSC).

[0044] The more preferable upper and lower limits of the heat of fusion when the female fitting portion 22 is heated to 170°C at a heating rate of 99.9°C / min and when the female fitting portion 22 is heated to 190°C at a heating rate of 99.9°C / min are the same as those of the male fitting portion 18. Specific examples of the resin that constitutes female fitting portion 22 include the same resins as those exemplified for male fitting portion 18, and the preferred embodiments are also the same. Female fitting portion 22 may be made of one type of resin, or two or more types of resins.

[0045] The second substrate 20 may be a single layer or multiple layers. When the second base material 20 is a single layer, the resin constituting the second base material 20 is preferably the same as the resin constituting the female fitting portion 22. An example of the multi-layer second substrate 20 is one that includes a substrate layer and a seal layer provided on the substrate layer on the opposite side from the female fitting portion 22. The resin that constitutes the substrate layer in the multi-layer second substrate 20 is preferably the same as the resin that constitutes the female fitting portion 22. As the material that constitutes the substrate layer of the second substrate 20, one type may be used alone, or two or more types may be used in combination.

[0046] The multi-layer second substrate 20 may have an intermediate layer between the substrate layer and the sealing layer. Examples of materials for the sealing layer and intermediate layer of the second substrate 20 include the same materials as those exemplified for the first substrate 16, and the preferred embodiments are also the same. As the materials for the sealing layer and intermediate layer of the second substrate 20, one type may be used alone, or two or more types may be used in combination. The second substrate 20 may contain known additives such as stabilizers, antioxidants, lubricants, antistatic agents, colorants, etc., as needed.

[0047] The preferred width and thickness of the second substrate 20 are similar to the preferred width and thickness of the first substrate 16 .

[0048] (Method of manufacturing fitting) The method for manufacturing the fitting 10 is not particularly limited, and any known method can be used. For example, a method can be exemplified in which the resin material for forming first base material 16 and male fitting portion 18 is prepared by melt-kneading or the like, and then extruded using an extruder to form the first fitting member.

[0049] The materials may be mixed by dry mixing using a super mixer, a Henschel mixer or the like. Examples of the melt-kneading method include a method in which the raw materials are fed into a melt-kneading machine such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader, or a mixing roll, and melt-kneaded. Examples of molding methods include extrusion molding, injection molding, inflation molding, and vacuum molding.

[0050] [Bag with fitting] The bag with fitting according to the embodiment is a bag equipped with the fitting according to the embodiment, i.e., a bag in which the fitting according to the embodiment is attached to the inner surface of the opening of the bag body that contains the contents. The bag with fitting according to the embodiment can adopt any known configuration except for being equipped with the fitting according to the embodiment. Hereinafter, a description will be given of a bag body with a fitting according to an example of the embodiment.

[0051] Fig. 4 is a front view of a bag with a fitting according to one example of the embodiment, and Fig. 5 is a perspective view of the bag with a fitting of Fig. 4 in an opened state. As shown in Figure 4, the bag body with fitting 1 of this embodiment (hereinafter also simply referred to as "bag body 1") comprises a bag body 40 that contains the contents, and a fitting 10 attached to the inner surface of the upper part of the bag body 40.

[0052] The bag body 40 has a rectangular shape when viewed from the front. The fitting 10 is provided on the inner surface of the upper side of the bag body 40 so as to extend in the short direction of the bag body 40. However, the shape of the bag body 40 is not limited to a rectangle.

[0053] The bag body 40 is sealed with contents (not shown) enclosed inside. The bag body 40 is obtained by overlapping a first film material 42 and a second film material 44 and heat-sealing all four peripheral edges 46. At side seal portions 46a where the side edges of the peripheral edges 46 are heat-sealed, the outer surfaces of the first substrate 16 and the second substrate 20 of the fitting 10 are heat-sealed to the first film material 42 and the second film material 44, respectively.

[0054] The first film material 42 and the second film material 44 may be any material that can weld the fitting 10 by heat sealing, and are preferably laminated films having at least a sealant layer and a base layer from the inner side.

[0055] Examples of resins constituting the base layer of the laminated film include linear low-density polyethylene, low-density polyethylene, high-density polyethylene, polyester, biaxially oriented nylon, and biaxially oriented polypropylene. Examples of resins that can be used to form the sealant layer of the laminated film include linear low-density polyethylene, low-density polyethylene, unstretched polypropylene, ethylene-vinyl acetate copolymer, and ionomer. The laminated film may be provided with a functional layer such as a barrier layer, etc. Also, from the viewpoint of environmental consideration, a synthetic resin may be mixed with cellulose. The first film material 42 and the second film material 44 may also be single-layer films.

[0056] The bag body 40 is provided with a cutting assist line 48 along the fitting 10 above the fitting 10. The cutting assist line 48 is a linear portion processed to assist in cutting the bag body 40. Examples of the cutting assist line 48 include weakened lines provided in the first film material 42 and the second film material 44 at the portion of the cutting assist line 48. The weakened line can be formed by providing a portion of the film material that is thinner than the surrounding area. Alternatively, the weakened line can be formed by perforations or rows of small holes. Furthermore, the cutting assistance line 48 is not limited to a weakened line, but may be a line formed by printing or the like, which indicates the position to cut with scissors, a cutter or the like.

[0057] A notch 50 is formed at the end of the cutting assist line 48 in the peripheral edge portion 46. The shape of the notch 50 is not particularly limited, and a triangular or semicircular cutout can be used. Alternatively, the notch 50 may be a cut provided in the peripheral edge portion 46.

[0058] 5 is a schematic perspective view showing the opened state of the bag body 1. The bag body 1 can be opened by cutting and removing the upper part of the bag body 40 from the notch 50 along the cutting assistance line 48, thereby forming an opening 52 in the upper part. The opening 52 formed in the bag 1 can be repeatedly opened and closed by attaching and detaching the first fitting member 12 and the second fitting member 14 of the fitting 10.

[0059] (Method of manufacturing a bag body with a fitting) The method for manufacturing the bag with fitting according to the embodiment is not particularly limited, and the bag with fitting can be manufactured by a known method other than using the fitting according to the embodiment. For example, an automatic bag making machine is used to attach the fitting 10 to the inner surfaces of the first film material 42 and the second film material 44. Inside the bag making machine, a series of sealing processes are performed in order while the strip-shaped fitting 10 in a fitted state runs between the strip-shaped first film material 42 and the second film material 44. First, the first film material 42 and the first substrate 16 of the fitting 10, and the second film material 44 and the second substrate 20 of the fitting 10 are heat-sealed, followed by a cooling press. Next, the portions to be side-sealed in the male fitting portion 18 and the female fitting portion 22 are point-sealed to crush the fitting portions, and then side-sealing is performed to form a bag to constitute the bag body 40 with the fitting 10 attached. Point sealing may be performed multiple times in succession, and side sealing may also be performed multiple times in succession.

[0060] The sealing temperature and sealing time in each sealing step can be set appropriately depending on the resin that constitutes the fitting 10. For example, when heat-sealing the fitting 10 to the first film material 42 and the second film material 44, the sealing temperature can be 120 to 170° C., and the sealing time can be 0.2 to 1.0 seconds. For example, the sealing temperature for point sealing can be 170 to 190°C, and the sealing time can be 0.2 to 1.0 seconds. For example, the side seal temperature can be set to 110 to 160°C, and the sealing time can be set to 0.2 to 1.0 seconds.

[0061] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention. [Example]

[0062] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following descriptions.

[0063] [DSC measurement] 10 mg of the fitting of each example was collected as a sample, and the following DSC measurements (1) to (3) were carried out to determine the melting peak temperature and heat of fusion. (1) Normal measurement In accordance with JIS K 7121, the sample was heated at a rate of 10°C / min to a temperature approximately 30°C higher than the temperature at the end of the melting peak, held at that temperature for 5 minutes, and then cooled to room temperature at a rate of 10°C / min to measure the melting peak temperature and heat of fusion. (2) Rapid temperature rise measurement at 170°C The sample was heated to 170°C at a rate of 99.9°C / min and held there for 7 minutes, then heated to 175°C at a rate of 10°C / min and held there for 1 minute, and then cooled to room temperature at a rate of 99.9°C / min, and the melting peak temperature and heat of fusion were measured. (3) Rapid temperature rise measurement at 190°C The temperature was raised to 190°C at a rate of 99.9°C / min and held for 7 minutes, then raised to 195°C at a rate of 10°C / min and held for 1 minute, and then cooled to room temperature at a rate of 99.9°C / min, and the melting peak temperature and heat of fusion were measured. A small amount of heat of fusion when the temperature is rapidly raised to the point seal temperature means that the crystallinity of the resin constituting the fitting portion is low, and the fitting portion is easily crushed by the point seal.

[0064] [Appearance evaluation at 190℃ point seal] An automatic bag-making machine was used to create a bag with a fitting, equipped with each fitting example. The fitting, with the male and female fitting portions mated, was heat-sealed to a film material having an aluminum layer on the inner surface of the bag body. The heat-sealing temperature was 150°C and the sealing time was 0.5 seconds. Point sealing of the side-sealed portions of the male and female fitting portions of the fitting was performed twice in succession at a sealing temperature of 190°C, a press pressure of 0.2 MPa, and a sealing time of 1 second. Side sealing was performed twice in succession at a sealing temperature of 140°C and a sealing time of 0.5 seconds. The resulting bag with a fitting was printed on top of the film material, and the portion of the side seal containing the fitting was visually inspected and evaluated according to the following evaluation criteria. <Evaluation criteria> 〇: No pinholes or wrinkles, good appearance △: No pinholes occur, but printing cracks occur ×: Pinholes occur, and cracks in the print and aluminum occur

[0065] [Measurement of thickness change rate] (1) With the female and male mating portions mated, a two-layer film (0.065 mm thick) consisting of nylon (Ny) (0.015 mm thick) and linear low-density polyethylene (LLDPE) (0.050 mm thick) was placed on each outer surface of the first and second substrates, with the LLDPE surface facing the substrate. The heat-sealing temperature was appropriately changed depending on the melting point of the resin of the mating device (or the sealing layer in the case of multiple layers), to create a film (sample) with mating device. (2) The thickness (maximum value) of the mating portion between the female mating portion and the male mating portion of the obtained film with mating device was measured with a vernier caliper at room temperature (25°C) and used as the initial thickness. (3) The film with the fittings, in which the female fitting portion and the male fitting portion were fitted together, was pressed from the outside (top and bottom) using a hot plate wrapped with Teflon (registered trademark) tape to prevent resin adhesion under the following conditions. (Pressing conditions) Press equipment: Sagawa Manufacturing heat seal tester Press pressure: 0.2 MPa Press temperature: 130℃, 150℃, 170℃ or 190℃ Press time: 1.0 seconds (4) After pressing, the thickness (maximum value) of the mating portion between the female mating portion and the male mating portion of the mating-equipped film was measured with a vernier caliper. (5) The initial thickness (mm) of the fitting part of the film with fittings was defined as T1, and the thickness (mm) after pressing was defined as T2, and the thickness change rate was calculated using the following formula. Thickness change rate (%) = (T2 - T1) / T1 x 100 In addition, the horizontal axis was plotted with the pressing temperature (°C) and the vertical axis with the thickness change rate (%). The slope a from 150 to 170°C, the slope b from 170 to 190°C, and the slope c from 130 to 150°C were determined, and ba and bc were calculated.

[0066] Melt Flow Rate (MFR) The MFR of the raw materials used in Examples 1 to 5 and Comparative Examples 1 and 2 was measured in accordance with JIS K 7210-1 under the conditions of a temperature of 190° C. and a load of 2.16 kg.

[0067] [Example 1] The resin constituting the first substrate, the second substrate, the male mating part, and the female mating part was LLDPE (melting point: 118°C, density: 914 kg / m 3 A fitting in which the first substrate and the second substrate each have a single-layer structure as shown in Figure 2 was manufactured by extrusion molding using a composite die (MFR: 8.0 g / 10 min) using a polymerizable copolymer (polymerizable copolymer, MFR: 8.0 g / 10 min). The results of DSC measurement of the produced fitting are shown in Table 1. The first and second substrates had a thickness of 0.16 mm and a width of 13 mm. The male mating portion had a claw height of 1.21 mm and a claw width of 0.69 mm, and the female mating portion had a claw height of 1.64 mm, a claw width of 1.45 mm, and a mating portion thickness of 1.83 mm.

[0068] [Example 2] The resin constituting the first substrate, the second substrate, the male mating part, and the female mating part is LDPE (melting point: 112°C, density: 923 kg / m 3 A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a polyester resin (polymerizable copolymer, MFR: 5.5 g / 10 min) was used. The results of DSC measurement of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.16 mm and a width of 13 mm. The male mating portion had a claw height of 1.10 mm and a claw width of 0.69 mm, and the female mating portion had a claw height of 1.51 mm, a claw width of 1.49 mm, and a mating portion thickness of 1.73 mm.

[0069] [Example 3] The base material layers of the first and second base materials, and the resin constituting the male mating part and female mating part were LDPE (melting point: 118°C, density: 914 kg / m 3 , MFR: 8.0 g / 10 min) and LLDPE (melting point: 112 °C, density: 923 kg / m 3 A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a mixed resin prepared by melt-kneading two materials (polyethylene glycol terephthalate, MFR: 5.5 g / 10 min) in a mass ratio of 40:60 was used. The results of DSC measurement of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.16 mm and a width of 13 mm. The male mating portion had a claw height of 1.15 mm and a claw width of 0.73 mm, and the female mating portion had a claw height of 1.54 mm, a claw width of 1.44 mm, and a mating portion thickness of 1.79 mm.

[0070] [Example 4] The resin constituting the first substrate, the second substrate, the male mating part, and the female mating part was polypropylene (melting point: 130°C, density: 890 kg / m 3A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a polyester resin (polymerizable copolymer, MFR: 6.0 g / 10 min) was used. The results of DSC measurement of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.14 mm and a width of 13 mm. The male mating portion had a claw height of 1.18 mm and a claw width of 0.72 mm, and the female mating portion had a claw height of 1.30 mm, a claw width of 1.59 mm, and a mating portion thickness of 1.51 mm.

[0071] [Example 5] The base material layers of the first and second base materials, and the resin constituting the male and female mating parts are polypropylene (melting point: 125°C, density: 885 kg / m 3 A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a polyester resin (polymerizable copolymer, MFR: 7.5 g / 10 min) was used. The results of DSC measurement of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.14 mm and a width of 13 mm. The male mating portion had a claw height of 1.11 mm and a claw width of 0.69 mm, and the female mating portion had a claw height of 1.22 mm, a claw width of 1.43 mm, and a mating portion thickness of 1.43 mm.

[0072] [Comparative Example 1] The resin constituting the first substrate, the second substrate, the male mating part, and the female mating part was polypropylene (melting point: 158°C, density: 900 kg / m 3 A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a polyester resin (polymerizable copolymer, MFR: 7.0 g / 10 min) was used. The results of DSC measurement of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.13 mm and a width of 13 mm. The male mating portion had a claw height of 1.28 mm and a claw width of 0.69 mm, and the female mating portion had a claw height of 1.42 mm, a claw width of 1.72 mm, and a mating portion thickness of 1.61 mm.

[0073] Comparative Example 2 The base material layers of the first and second base materials, and the resin constituting the male and female mating parts are HDPE (melting point: 131°C, density: 960 kg / m3 A fitting in which the first substrate and the second substrate were both single-layered was manufactured in the same manner as in Example 1, except that a polyester resin (polymerizable copolymer, MFR: 8.0 g / 10 min) was used. The DSC measurement results of the manufactured fitting are shown in Table 1. The first and second substrates had a thickness of 0.15 mm and a width of 13 mm. The male mating portion had a claw height of 1.18 mm and a claw width of 0.74 mm, and the female mating portion had a claw height of 1.53 mm, a claw width of 1.55 mm, and a mating portion thickness of 1.86 mm.

[0074] Table 1 shows the results of DSC measurement of the fittings produced in each example, and the appearance evaluation of the bags with fittings produced by point sealing at 190°C. Table 2 shows the initial thickness of the fitting portion of the film for each example in the "measurement of thickness change rate," and the thickness after pressing at 130°C, 150°C, 170°C, and 190°C. Table 3 also shows the thickness deformation rate at each sealing temperature, and the calculated results of the temperature change slopes a to c and ba and bc of the thickness change rate. Figure 6 shows a graph of the thickness change rate measurement results for each example, plotting the pressing temperature (°C) on the horizontal axis and the thickness change rate (%) on the vertical axis. Figure 7 also shows a bar graph of the slopes a and b for each example.

[0075] [Table 1]

[0076] [Table 2]

[0077] [Table 3]

[0078] As shown in Tables 1 to 3 and Figures 6 and 7, the fittings of Examples 1 to 5, which satisfied conditions (A) and (B), had their male and female fitting portions sufficiently crushed when point-sealed at 190°C, and the resulting bags with fittings had no pinholes, wrinkles, deformations, cracks in the printing, or cracks in the aluminum in the side seal portion, and had a good appearance. Furthermore, in Examples 1 to 5, point-sealing at 130 to 170°C significantly reduced the thickness, almost completing the crushing of the fitting portion, while point-sealing at 170 to 190°C reduced the thickness only slightly, demonstrating good point-sealability at temperatures below 190°C. On the other hand, in the fittings of Comparative Examples 1 and 2, which did not satisfy conditions (A) and (B), the male fitting portion and the female fitting portion were insufficiently crushed when point-sealed at 190°C, and the produced bags with fittings had pinholes, wrinkles, deformation, cracks in the printing, and cracks in the aluminum in the side seal portion, resulting in a poor appearance. In Comparative Examples 1 and 2, the fitting portion could not be sufficiently crushed when point-sealed at 150 to 170°C, and there was a large change in thickness even when point-sealed at 170 to 190°C, and the point-sealability at 190°C or below was poor.

[0079] Furthermore, as shown in Table 1, in Examples 1 to 5, the heat of fusion was 90 J / g or less when the temperature was raised to 170°C at a heating rate of 99.9°C / min, and the heat of fusion was 90 J / g or less when the temperature was raised to 190°C at a heating rate of 99.9°C / min. On the other hand, in the fittings of Comparative Examples 1 and 2, the heat of fusion when heated to 170°C at a heating rate of 99.9°C / min and the heat of fusion when heated to 190°C at a heating rate of 99.9°C / min both exceeded 90 J / g, indicating high crystallinity of the resin during the point sealing process and poor point sealing properties below 190°C. Furthermore, in normal measurements with a heating rate of 10°C / min, no correlation is found between the heat of fusion and the crushability of the fitting part or the appearance of the bag with fitting when point-sealed at 190°C. However, in measurements with a heating rate of 99.9°C / min, a correlation is found between the heat of fusion and point-sealability.

[0080] For sufficient point sealing to occur at temperatures below 190°C, it is important that the thickness T2 decreases significantly in the press temperature range of 130°C to 170°C, and that the crushing is nearly complete at a press temperature of 170°C. The degree of completion of the crushing can be determined by the fact that the difference between the thickness T2 at a press temperature of 190°C and the thickness T2 at a press temperature of 170°C is small, and the thicknesses remain almost the same. In particular, thickness T2 decreases significantly at press temperatures of 150°C to 170°C, and it is preferable that the difference between thickness T2 at a press temperature of 190°C and thickness T2 at a press temperature of 170°C is small, making point sealing at 180°C to 190°C possible.

[0081] As shown in Figure 6, in a graph plotting press temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, when the slope at press temperatures of 150 to 170°C is a and the slope at press temperatures of 170 to 190°C is b, the angle of slope a was large and the angle of slope b was small for the fittings of Examples 1 to 5, which had good point sealing properties at temperatures below 190°C. As shown in Figure 7, the slope of the thickness change rate was a negative value, and the larger the angle, the smaller the numerical value, so b>a. Furthermore, when the slope at a press temperature of 130°C to 150°C is taken as c, the angle of slope c was larger than the angle of slope b in the fittings of Examples 1 to 5, which had good point sealing properties at temperatures of 190°C or less. The slope of the thickness change rate was a negative value, and the larger the angle, the smaller the numerical value, so b>c. In addition, in the fittings of Comparative Examples 1 and 2, in which the point seal was insufficient at temperatures below 190°C, the thickness T2 was not sufficiently compressed at a press temperature of 170°C, and therefore the thickness T2 at a press temperature of 190°C was significantly smaller than the thickness T2 at a press temperature of 170°C. In other words, the angle of inclination b was large at press temperatures of 170 to 190°C, and b <aとなった。 [Explanation of symbols]

[0082] 1. Bag body with fitting 10 Fitting 12 First fitting member 14 Second fitting member 16 First base material 18 Male mating part 20 Second base material 22 Female mating part 40 bags 42 First film material 44 Second film material 48 Cutting auxiliary line 50 notches 100 Film with fitting 110 Film

Claims

1. A fitting device comprising a first fitting member having a male fitting portion provided along the longitudinal direction on the surface of a belt-shaped first base material, and a second fitting member having a female fitting portion provided along the longitudinal direction on the surface of a belt-shaped second base material, wherein the male fitting portion and the female fitting portion are detachably fitted together, A film with a fitting is prepared by bonding a film to the outer surface of the first substrate and the second substrate while the male fitting portion and the female fitting portion are fitted together, and the fitting portions of the male fitting portion and the female fitting portion are pressed from the outer surface of the film for 1.0 second at a press temperature of 150°C, 170°C or 190°C and a press pressure of 0.2 MPa, and when the change in thickness of the fitting portions of the film with a fitting is measured, a fitting that satisfies the following conditions (A) and (B): (A) When the initial thickness (mm) of the fitting portion of the fitting-equipped film is T1 and the thickness (mm) after pressing is T2, and the thickness change rate is calculated using the following formula, the thickness change rate after pressing at 170°C relative to the initial thickness is -99 to -70%. Thickness change rate (%)=(T2−T1) / T1×100 (1) (B) In a graph plotting press temperature (°C) on the horizontal axis and thickness change rate (%) on the vertical axis, when the slope from 150 to 170°C is a and the slope from 170 to 190°C is b, b>a.

2. 2. The fitting according to claim 1, wherein 0.10≦b−a≦1.00 is satisfied.

3. The fitting device according to claim 1, further measuring the change in thickness of the fitting portion of the film with fitting when the fitting portion is pressed from each outer surface of the film for 1.0 second at a press temperature of 130°C and a press pressure of 0.2 MPa, and plotting the press temperature (°C) on the horizontal axis and the thickness change rate (%) on the vertical axis, where c is the slope from 130°C to 150°C, satisfies -0.12≦b≦0 and -1.50≦c≦-0.

35.

4. 2. The fitting according to claim 1, wherein, in differential scanning calorimetry (DSC), the heat of fusion is 90 J / g or less when heated to 170°C at a heating rate of 99.9°C / min, and the heat of fusion is 90 J / g or less when heated to 190°C at a heating rate of 99.9°C / min.

5. A bag body with a fitting, comprising the fitting according to any one of claims 1 to 4.

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