Packaging Container

Abstract

To provide a package having a side gusset up to an opening part and including a re-sealing function.SOLUTION: A package 101 includes: a first packing material part 121; a second packing material part 122 arranged so as to face the first packing material part 121; a first edge 131; a second edge 132 facing the first edge 131; a side part 133 crossing with the first edge 131 and the second edge 132; and a side gusset part provided so as to be bonded to the side part 133 of the first packing material part 121 and the second packing material part 122. The side gusset part is provided from the first edge 131 to the second edge 132. A hook-and-loop fastener part 180 is provided in an inner surface at a position close to the first edge 131, the hook-and-loop fastener part 180 having both facing inner surfaces including a hook-shaped engagement element 181. The hook-and-loop fastener part 180 is provided in a region where at least the first packing material part 121 and the second packing material part 122 overlap with the side gusset part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging container with a resealable function. [Background technology]

[0002] In recent years, the demand for packages with a resealing function has been growing due to the increase in the volume of products and the increase in applications where the contents are used little by little. Patent Document 1 discloses a configuration that realizes the resealing function by using a zipper member having a fitting part with a concave-convex shape. However, the zipper member requires that the fitting part, which extends elongatedly, be properly fitted when resealing, making it difficult to perform the resealing operation properly and making it difficult to use. Furthermore, Patent Document 1 describes that the fastener is not limited to a zipper member, and a hook-and-loop fastener may also be used.

[0003] Furthermore, because of the advantages of being able to increase the volume of the storage section and having self-supporting properties, packaging containers with folded sections (gussets) called gusset bags and the like are used (for example, Patent Document 2). The self-supporting packaging bag disclosed in Patent Document 2 has a V-shaped side gusset on the side, has a storage section with a large volume, and has an opening that can be opened widely, making it highly convenient.

[0004] However, even if one tries to apply the resealing function disclosed in Patent Document 1 to a packaging container equipped with side gussets as in Patent Document 2, it is necessary to eliminate the gussets at the locations where conventional zipper members or hook-and-loop fasteners are attached, which creates the problem that the opening becomes narrower, making it difficult to put contents in and take them out. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-77916 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a packaging container that has side gussets up to the opening and has a resealable function. [Means for solving the problem]

[0007] The present invention solves the above problems by the following solving means. Note that, for ease of understanding, the following description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.

[0008] A first invention relates to a packaging container (101) having a first edge (131), a second edge (132) opposite the first edge (131), and a side portion (133) intersecting the first edge (131) and the second edge (132), the packaging container (101) comprising a first packaging material portion (121), a second packaging material portion (122) disposed opposite the first packaging material portion (121), and side gusset portions (124, 125) connected to the side portions of the first packaging material portion (121) and the second packaging material portion (122), The packaging container (101) is configured such that the gusset portions (124, 125) are provided from the first edge (131) to the second edge (132), and a hook-and-loop fastener (180) having hook-shaped engaging elements (181) on both opposing inner surfaces is provided on the inner surface at a position near the first edge (131), and the hook-and-loop fastener (180) is provided at least in the area where the first packaging material portion (121) and the second packaging material portion (122) overlap with the side gusset portions (124, 125).

[0009] A second invention relates to a packaging container (101) having a first edge (131), a second edge (132) opposite the first edge (131), and a side portion (133) intersecting the first edge (131) and the second edge (132), the packaging container (101) comprising a first packaging material portion (121), a second packaging material portion (122) disposed opposite the first packaging material portion (121), and side gusset portions (124, 125) joined to the side portions of the first packaging material portion (121) and the second packaging material portion (122), The packaging container (101) has side gusset portions (124, 125) extending from the first edge (131) to the second edge (132), and a hook-and-loop fastener (180) is provided on the inner surface near the first edge (131) and the hook-and-loop fastener has a hook-shaped engaging element (181) on both of its opposing inner surfaces and is capable of folding back to join, and the hook-and-loop fastener is provided at least in the area where the first packaging material portion (121) and the second packaging material portion (122) overlap with the side gusset portion.

[0010] A third invention is a packaging container (101) according to the first or second invention, characterized in that the hook-and-loop fastener (180) is provided around the entire periphery of both the inner surfaces of the first packaging material portion (121) and the second packaging material portion (122) and the inner surfaces of the side gusset portions (124, 125).

[0011] A fourth invention is the packaging container (101) according to the third invention, characterized in that the hook-and-loop fastener (180) is composed of a single hook-and-loop fastener tape.

[0012] A fifth invention is the packaging container (101) according to the fourth invention, characterized in that the loop stiffness of the hook-and-loop fastener (180) alone is 7000 mN or less under the conditions of a loop length of 60 mm, a pushing speed of 3.3 mm / s, and a pushing hold time of 3 s.

[0013] A sixth invention is a packaging container (101) according to any one of the first to fifth inventions, characterized in that the hook-and-loop fastener (180) further comprises an array of a plurality of columnar engaging elements (182) rising from the fastener surface.

[0014] A seventh invention is a packaging container (101) according to any one of the first to sixth inventions, characterized in that the first packaging material portion (121) and the second packaging material portion (122) are made of a laminated film (160) having at least a base material layer (161) and a sealant layer (164), and the packaging container (101) comprises a storage portion (102) capable of storing contents, sealing portions (141, 142, 143) formed around the storage portion (102), and a portion to be sealed that is to be sealed after the contents are stored. Effect of the Invention

[0015] According to the present invention, it is possible to provide a packaging container that has side gussets up to the opening and is equipped with a resealable function. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a plan view of the packaging container 101 of the present embodiment. [Diagram 2] FIG. 2 is a perspective view showing a state in which the packaging container 101 is opened. [Diagram 3] 1 is a cross-sectional view of a laminated film 160 used in the packaging container 101 of the present embodiment. [Figure 4] 2 is a cross-sectional view of the packaging container 101 taken along the position of the arrow AA in FIG. [Diagram 5] FIG. 13 is a perspective view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A. [Figure 6] FIG. 1 is a plan view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A. [Figure 7] 7 is a cross-sectional view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A taken along the position of arrow BB in FIG. 6. [Figure 8]7 is a cross-sectional view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A taken along the position of arrow CC in FIG. 6. FIG. [Figure 9] 13 is a diagram for explaining the dimensions of hook-shaped engaging elements 181 and columnar engaging elements 182 in the form of the hook-and-loop fastener A. FIG. [Figure 10] FIG. 10 is a diagram showing the dimensions d1 to d11 shown in FIGS. 6 and 9. [Figure 11] 13 is a perspective view of a hook-and-loop fastener portion 180 of hook-and-loop fasteners B and C. FIG. [Figure 12] 13 is a plan view of the hook-and-loop fastener portion 180 of hook-and-loop fasteners B and C. FIG. [Figure 13] 13 is a cross-sectional view of a hook-and-loop fastener portion 180 of the hook-and-loop fastener types B and C taken along the position of the arrow GG in FIG. [Figure 14] 13 is an enlarged cross-sectional view of a hook-and-loop fastener portion 180 of the hook-and-loop fastener types B and C taken along the position of the arrow HH in FIG. [Figure 15] FIG. 15 is a diagram showing the dimensions d1 to d10 shown in FIGS. 12 and 14. [Figure 16] FIG. 13 is a diagram showing the state in which the vicinity of the side gusset portion has been resealed. [Figure 17] FIG. 13 is a diagram showing the state in which both the side gusset portion and the center portion have been resealed. [Figure 18] FIG. 13 is a diagram showing the state in which the hook-and-loop fastener portion 180 has been joined. [Figure 19] 13 is a diagram showing the state in which the side gusset portion is fully extended to maximize the opening area of ​​the opening. FIG. [Figure 20] FIG. 2 is a plan view showing an example of a loop stiffness measuring device. [Figure 21] FIG. 21 is a cross-sectional view of the loop stiffness measuring device of FIG. 20 taken along line GG. [Figure 22] FIG. 1 is a diagram for explaining a process of attaching a test piece to a loop stiffness measuring device. [Diagram 23] FIG. 13 is a diagram for explaining a step of forming a loop portion in a test piece. [Figure 24]FIG. 13 is a diagram for explaining a process of applying a load to a loop portion of a test piece. [Diagram 25] FIG. 13 is a diagram for explaining a process of applying a load to a loop portion of a test piece. [Figure 26] FIG. 11 is a diagram summarizing the results of evaluation of loop stiffness, bondability, and ease of removal when resealing samples of multiple types of packaging containers. [Figure 27] 13A and 13B are diagrams illustrating an embodiment in which the chuck member is provided not all around the circumference. [Figure 28] FIG. 2 is a diagram showing a method for measuring the bonding strength of a hook-and-loop fastener tape. [Figure 29] FIG. 1 is a diagram showing the results of measuring the bonding strength of hook-and-loop fasteners A, B, and C. [Diagram 30] FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied to a side gusset pillow pouch. [Diagram 31] 13 is a diagram showing a form in which a hook-and-loop fastener portion 180 is provided on a part of the inner circumference of a packaging container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[0018] (Embodiment) Fig. 1 is a plan view of a packaging container 101 of this embodiment. In Fig. 1, the sealed area is indicated by hatching. FIG. 2 is a perspective view showing the packaging container 101 in an opened state. Note that the figures shown below, including Figures 1 and 2, are schematic diagrams, and the size and shape of each part are exaggerated or omitted as appropriate to make them easier to understand. In the following description, specific numerical values, shapes, materials, etc. are given, but these can be changed as appropriate.

[0019] The packaging container 101 of this embodiment is distributed and sold, for example, with various contents stored therein, and after opening, a part of the contents can be removed and the container can be resealed (reclosed) with the remainder stored therein. The contents may be any type, such as a solid, a powder, or a liquid.

[0020] (Container body) 2, the container body 106 of the packaging container 101 is a bag-shaped container in a gusset bag format that includes a gusset folding portion (hereinafter referred to as a side gusset portion) consisting of side films 124, 125 connected to a side portion 133, and can be made to stand on its own by folding the bottom, and is made of a flexible laminated film (packaging material). The laminated film that constitutes the container body 106 includes a surface film 121 that forms the surface, a back surface film 122 that forms the back surface, and the side films 124, 125. In this embodiment, an example in which a gusset portion is not provided on the bottom (second edge) 132 will be described, but a configuration in which a gusset portion is also provided on the bottom 132 may be used.

[0021] In this embodiment, the surface film (first packaging material portion) 121, the back film (second packaging material portion) 122, and the side films (side gusset portions) 124, 125 are composed of a laminated film having a substantially rectangular shape. The substantially rectangular shape is not limited to a geometric rectangle, but includes shapes that are recognized as rectangular in an overall view. For example, one or more of the side edges, bottom edges, and top edges may include curved portions. In addition, the corners of the laminated film may be rounded in an outwardly convex arc shape.

[0022] Furthermore, the front film 121, the back film 122, and the side films 124, 125 may be separate laminated films, or any of them may be joined together, before the container body 106 is formed. The joined laminated films are folded to form the front film 121, the back film 122, and the side films 124, 125.

[0023] In this embodiment, the container body 106 is formed by a front film 121, a back film 122, and side films 124 and 125, which are individually configured. At the upper portion (first edge) 131 of the container body 106, the upper portion of the front film 121, the upper portion of the back film 122, and the upper portions of the side films 124, 125 folded in half are joined by heat sealing (thermal welding). By this joining, an upper seal portion 141 is formed in the upper portion 131 of the container body 106 as a seal portion joining the upper portion of the front film 121, the upper portion of the back film 122, and the upper portions of the side films 124, 125. That is, the packaging container 101 of this embodiment has a side gusset portion formed up to the upper end portion.

[0024] In this embodiment, the side gusset portion (gusset folding portion) is provided to the upper end of the side portion 133, and this side gusset portion can be sufficiently expanded. Therefore, the container body portion 106 can have a very large opening area when the top is opened. The side films 124, 125 forming the side gusset portion of the side portion 133 can be folded back so that folded back portions 136, 137 are formed on the inside. This reduces the overall thickness of the container body portion 106 when no contents are contained.

[0025] At the side 133 of the container body 106, the side of the surface film 121 and the side of the side films 124, 125 are joined by heat sealing. Also, the side of the back film 122 and the side of the side films 124, 125 are joined by heat sealing. By these joinings, the side seal portion 143 is formed as a seal portion joining the side of the surface film 121 and the side of the side films 124, 125, and the side of the back film 122 and the side of the side films 124, 125, respectively, at the left and right side 133 of the container body 106. The left and right side seal portions 143 are formed so that their upper ends are continuous with the upper seal portion 141, and also so that the vicinity of their lower ends is continuous with the bottom seal portion 142 described below. The side seal portion 143 is provided with a notch 107 for separating the upper seal portion 141 of the container body portion 106 to form an opening OP (see FIG. 2). Notch 107 is provided for separating upper seal portion 141 from container body 106 to open packaging container 101. Notch 107 is a cut provided on the upper end side of side seal portion 143, below upper seal portion 141, and approximately parallel to upper seal portion 141, and is provided from the edge of side portion 133 of container body 106 to the storage portion 102 side so as not to penetrate into storage portion 102.

[0026] At the bottom 132 of the container body 106, the bottom of the front film 121, the bottom of the back film 122, and the bottom of the side films 124, 125 folded in half are joined together. In this manner, a bottom seal portion 142 is formed at the bottom 132 of the container body 106. The storage section 102 is a space inside the container body 106 that can store the contents. When the upper seal portion 141 is separated from the container body 106 using the notch 107 to open the packaging container 101, the upper part of the storage section 102 is opened (see FIG. 2).

[0027] Before the contents are contained in the container body 106, at least one of the upper seal portion 141, the bottom seal portion 142, and the side seal portion 143 is in an unsealed sealed state, and after the contents are contained in the container portion 102 through this sealed portion, the contents can be hermetically sealed by heat sealing (joining) the sealed portion.

[0028] (Laminated film) FIG. 3 is a cross-sectional view of a laminated film 160 used in the packaging container 101 of this embodiment. The front film 121, the back film 122, and the side films 124 and 125 constituting the container body 106 are made of a laminated film 160. As described above, the container body 106 is made into a bag by heat-sealing the laminated film 160 constituting the pair of the front film 121, the back film 122, and the side films 124 and 125. For this reason, the laminated film 160 is provided with at least a base material layer 161 and a sealant layer 164 having sealing properties in a portion that is to become the inner side of the container. In addition, a plurality of base material layers may be provided, and the sealant layer may be composed of a plurality of layers. In the container body 106 of the present embodiment, a base material layer 161 serving as a printing base material is provided on a portion that is closer to the container outer side than the sealant layer 164. Note that the laminated film 160 may be configured to include other layers 163 as necessary to impart various functions according to the application.

[0029] The base layer 161 may be, for example, a stretched polyethylene terephthalate film, a silica-vapor-deposited stretched polyethylene terephthalate (PET) film, an alumina-vapor-deposited stretched polyethylene terephthalate film, a stretched polyamide film, a stretched polypropylene film, or a composite film formed by laminating two or more of these films.

[0030] Preferably, the base material layer 161 is biaxially stretched. As a result, the molecules constituting the base material layer 161 are aligned in the stretching direction by the stretching process, and the base material layer 161 exhibits excellent dimensional stability. In addition, the biaxial stretching process can impart easy-opening properties to the base material layer 161.

[0031] The thickness of such a base material layer 161 is, for example, about 10 to 50 μm. In this case, it is possible to reduce production costs while satisfying the heat resistance required for the container body 106. Note that the base material layer 161 of this embodiment also functions as the layer of the laminated film 160 that is located on the outermost side of the container when the container body 106 is made into a bag.

[0032] 3, in this embodiment, a pattern layer 162 including a pattern is laminated on the surface of the base layer 161 facing the inside of the container. Here, the pattern refers to various types of recording objects that can be recorded or printed on the base layer 161, and is not particularly limited and broadly includes figures, characters, designs, patterns, symbols, patterns, marks, etc. Note that the pattern layer 162 is laminated on the base layer 161 as necessary, and the base layer 161 does not necessarily need to be provided with the pattern layer 162. In that case, for example, various indications may be made by attaching a label.

[0033] In this embodiment, the pattern layer 162 is applied to the inner surface of the base material layer 161, not to the outer surface of the base material layer 161 which is on the outer side of the container. In this case, the pattern layer 162 has excellent abrasion resistance, and therefore can effectively prevent disappearance due to rubbing, etc., and can also effectively prevent tampering with the pattern. In addition, it is preferable that the base material layer 161 has transparency so that the pattern layer 162 laminated on the inner surface of the base material layer 161 can be visually recognized through the base material layer 161 when the packaging container 101 is made into a bag.

[0034] As described above, the sealant layer 164 is provided to bond and seal the edges of the two laminated films 160 by overlapping them and heat-sealing the areas near the opposing edges. In this embodiment, the sealant layer 164 is disposed on the side of the laminated film 160 that will be the innermost side of the container when the container body 106 is made into a bag.

[0035] Films made of polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-propylene block copolymer, and conventionally known easy-peel films can be used as the sealant layer 164. The sealant layer 164 may be formed as a single layer using films made of these materials, or may be formed as multiple layers.

[0036] Furthermore, when the packaging container 101 is used as a container for a microwave oven, heat resistance is required, so it is preferable that the sealant layer 164 has a non-oriented polypropylene layer (CPP layer) mainly containing non-oriented polypropylene (CPP), or a linear low-density polyethylene layer (LLDPE layer) mainly containing linear low-density polyethylene (LLDPE).

[0037] The thickness of the sealant layer 164 is preferably 30 μm or more. Also, the thickness of the sealant layer 164 is preferably 200 μm or less. In this case, the packaging container 101 has excellent impact resistance against dropping that may occur during distribution, and also has excellent handling properties such as ease of filling the contents and ease of refilling the contents.

[0038] On the other hand, the other layer 163 can be provided to supplement various functions depending on the application, and its position can be appropriately selected. In order to preserve the contents for a long period of time, the other layer 163 may have a vapor barrier property that prevents the transmission of water vapor and a gas barrier property that prevents the transmission of gases such as oxygen gas. In addition, the other layer 163 may have a function of sufficiently increasing concealment so that the contents of the packaging container 101 cannot be seen, in order to increase consumer purchasing motivation. Therefore, examples of the other layer 163 include a gas barrier layer, a light-shielding layer, and the like.

[0039] The gas barrier layer may be a metal foil such as an aluminum foil, a vapor deposition layer, etc. The vapor deposition layer may be provided on the base layer or on the sealant layer. The vapor-deposited layer may be a metal vapor-deposited layer made of a vapor-deposited layer of a metal such as aluminum, or may be a transparent vapor-deposited layer made of a vapor-deposited layer of an inorganic oxide such as aluminum oxide or silicon oxide.

[0040] The gas barrier layer may also include a vapor deposition layer and an organic coating layer formed on the vapor deposition layer. The organic coating layer is formed by applying a barrier coating agent onto the vapor-deposited film and solidifying it. The barrier coating agent is composed of a metal alkoxide, a hydroxyl-containing water-soluble resin, a silane coupling agent (if necessary), a sol-gel catalyst, an acid, etc.

[0041] As the metal alkoxide, the general formula R1 n M(OR 2 ) m (In the formula, R 1 , R 2 represents an organic group having 1 to 8 carbon atoms, M represents a metal atom, n represents an integer of 0 or more, m represents an integer of 1 or more, and n+m represents the atomic valence of M.) Examples of the metal atom represented by M of the metal alkoxide include silicon, zirconium, titanium, aluminum, and the like. For example, it is preferable to use an alkoxysilane in which M is Si.

[0042] The above alkoxysilanes include, for example, those represented by the general formula Si(ORa) 4 (wherein, Ra represents a lower alkyl group). In the above, Ra may be a methyl group, an ethyl group, an n-propyl group, an n-butyl group, or the like. A specific example of the alkoxysilane is tetramethoxysilane Si(OCH 3 ) 4 , tetraethoxysilane Si(OC 2 H 5 ) 4 , tetrapropoxysilane Si(OC 3 H 7 )4, Tetrabutoxysilane Si(OC 4 H 9 ) 4 The above alkoxides may be used in combination of two or more kinds.

[0043] Silane coupling agents having reactive groups such as vinyl, epoxy, methacryl, and amino groups can be used. In particular, organoalkoxysilanes having epoxy groups are suitable, and for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropyldimethylmethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyldimethylethoxysilane, or β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane can be used. The above-mentioned silane coupling agents may be used alone or in combination of two or more.

[0044] In particular, the crosslink density of the cured film of the organic coating layer using bifunctional organic compounds such as γ-glycidoxypropylmethyldimethoxysilane and γ-glycidoxypropylmethyldiethoxysilane is lower than that of the system using trialkoxysilane. Therefore, the cured film has excellent gas barrier properties and hot water treatment resistance, while also being flexible and has excellent bending resistance, so that the gas barrier properties of the packaging material using the barrier film are not easily deteriorated even after the Gelbo flex test.

[0045] As the hydroxyl group-containing water-soluble resin, a polyvinyl alcohol resin or an ethylene-vinyl alcohol copolymer can be used alone, or a polyvinyl alcohol resin and an ethylene-vinyl alcohol copolymer can be used in combination.

[0046] The light-shielding layer can be, for example, a metal foil such as aluminum or a metal vapor deposition layer. The other layer 163 may be formed by stacking two or more of the above-mentioned functional layers.

[0047] The base layer 161 may also be made of paper. When the base layer 161 is made of paper, the design layer 162 may be provided on the outer surface of the base layer 161, which faces the outside of the container. The basis weight of the paper used for the base layer 161 is 30 g / m 2The above materials can be suitably used. The basis weight of the paper used for the base layer 161 is 150 g / m 2 The following can be suitably used. The basis weight of the paper used for the base layer 161 is 130 g / m 2 The following can be more preferably used: The basis weight of the paper used for the base layer 161 is 100 g / m 2 The following can be more preferably used:

[0048] 3, in this embodiment, a bonding layer 165 is provided between the base material layer 161 on which the pattern layer 162 is provided and the base material layer 161 on which a gas barrier layer is provided as another layer 163, and between the base material layer 161 on which a gas barrier layer is provided as another layer 163 and the sealant layer 164. As the bonding layer 165, for example, an adhesive generally used in a known dry lamination method can be used, such as a polyvinyl acetate adhesive, a polyacrylic ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, or the like.

[0049] Alternatively, an adhesive resin layer generally used in the extrusion lamination method (sandwich lamination method) can be used as the bonding layer 165. As the thermoplastic resin usable for the adhesive resin layer, a polyethylene-based resin, a polypropylene-based resin, a cyclic polyolefin-based resin, or a copolymer resin, modified resin, or mixture (including alloy) containing these resins as main components can be used. Examples of polyolefin resins include low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-α-olefin copolymers polymerized using a metallocene catalyst, random or block copolymers of ethylene and polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-maleic acid copolymer, and ionomer resins. In addition, to improve the adhesion between layers, acid-modified polyolefin resins obtained by modifying the above-mentioned polyolefin resins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid can be used. In addition, resins obtained by graft-polymerizing or copolymerizing unsaturated carboxylic acids, unsaturated carboxylic anhydrides, and ester monomers with polyolefin resins can be used. These materials can be used alone or in combination of two or more. Examples of cyclic polyolefin resins that can be used include cyclic polyolefins such as ethylene-propylene copolymers, polymethylpentene, polybutene, and polynorbornene. These resins can be used alone or in combination of two or more. In this case, an anchor coat layer (AC layer) may be present between the substrate layer, and for example, an adhesive that is generally used in the dry lamination method known per se can be used, such as a polyvinyl acetate adhesive, a polyacrylic ester adhesive, a cyanoacrylate adhesive, an ethylene copolymer adhesive, a cellulose adhesive, a polyester adhesive, a polyamide adhesive, an amino resin adhesive, an epoxy adhesive, a polyurethane adhesive, etc.

[0050] A preferred embodiment of the laminated film 160 may have the following layer structure, in order from the base layer 161 side: (A) First base layer / sealant layer (B) First base layer / second base layer / sealant layer (C) First base layer / second base layer / third base layer / sealant layer Specific examples of the laminated film 160 include the following layer configurations, in order from the outer side of the container. (1) PET thickness 12 μm / inorganic oxide vapor deposition layer / organic coating layer / biaxially oriented polyamide film thickness 15 μm / CPP layer thickness 70 μm (2) Biaxially oriented polyamide film thickness 15 μm / PET thickness 12 μm / inorganic oxide vapor deposition layer / organic coating layer / CPP layer thickness 70 μm (3) PET thickness 12 μm / inorganic oxide vapor deposition layer / organic coating layer / PET thickness 12 μm / CPP layer thickness 70 μm (4) PET thickness 12 μm / inorganic oxide vapor deposition layer / organic coating layer / PET thickness 12 μm / PET thickness 12 μm / CPP layer thickness 70 μm (5) PET thickness 12 μm / PET thickness 12 μm / aluminum vapor deposition layer / LLDPE thickness 60 μm (6) Paper (50g / m 2 ) / Aluminum vapor deposition layer / CPP thickness 30μm

[0051] FIG. 4 is a cross-sectional view of the packaging container 101 taken along the position of the arrow AA in FIG. The hook-and-loop fastener section 180 is provided above the storage section 102 and below the notch 107, is a section that allows resealing after opening, and can be configured by a single hook-and-loop fastener tape (hook-and-loop fastener) arranged opposite to each other. The hook-and-loop fastener section 180 extends along the upper portion 131, and is configured by attaching a single hook-and-loop fastener tape over the entire periphery of the inner surface of the storage section 102. In this embodiment, an end of the hook-and-loop fastener tape is arranged at the position of the side seal section 143 that seals the front film 121 and the side film 124, and is arranged over the entire periphery of the inner surfaces of the front film 121, the side film 125, the back film 122, and the side film 124. That is, in the side seal portion 143, the hook-and-loop fastener portion 180 is sandwiched and sealed between the surface film 121 and the side film 125, between the surface film 121 and the side film 124, between the back film 122 and the side film 125, and between the back film 122 and the side film 124. In addition, the hook-and-loop fasteners located at the side seal portion 143 are heat-sealed so that they are welded to each other and to the films that they contact (front surface film 121, back surface film 122, side film 124, side film 125).

[0052] Unlike conventional hook-and-loop fastener tapes with a male-female distinction, the hook-and-loop fastener tape constituting the hook-and-loop fastener section 180 is configured so that fastener surfaces (engagement surfaces) of the same configuration can be joined together. Therefore, the hook-and-loop fastener section 180 of the above configuration is configured so that one hook-and-loop fastener itself, that is, the hook-and-loop fastener section 180 itself can be folded back and joined. In addition, in this embodiment, the hook-and-loop fastener section 180 is illustrated as an example in which the entire fastener surface is a hook-and-loop fastener tape of the same configuration, but it may be configured using a hook-and-loop fastener that includes the same configuration but has a partially different shape. Note that the same configuration as mentioned here does not refer to completely equal shapes or dimensions, but also includes those that are partially missing or deformed, or have different dimensions. Here, the range in which the same configuration can be considered even if the dimensions are different is a range in which the difference in dimensions is within ±10%, and more preferably, a range in which the difference in dimensions is within ±5%. The dimensions referred to here refer to d3, d4, d5, and d6.

[0053] (Hook and loop fastener A) In this embodiment, three types of hook-and-loop fasteners, hook-and-loop fasteners A, B, and C, are exemplified as specific forms of the hook-and-loop fastener portion 180. FIG. 5 is a perspective view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A. FIG. FIG. 6 is a plan view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A. FIG. FIG. 7 is a cross-sectional view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A taken along the position of arrow BB in FIG. FIG. 8 is a cross-sectional view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fastener A taken along the position of arrow CC in FIG. In addition, the direction indicated by the arrow MD in FIG. 5 and FIG. 6 is referred to as the MD (machine direction) direction, and the direction indicated by the arrow TD is referred to as the TD (transverse direction) direction. The hook-and-loop fastener portion 180 has a plurality of hook-shaped engaging elements 181 and a plurality of columnar engaging elements 182 arranged on a fastener surface where the two engage with each other while facing each other.

[0054] It is preferable that the main material of the hook-and-loop fastener portion 180 is polyethylene. Specifically, it is preferable that the polyethylene content is 50% by mass or more, more preferably 70% by mass or more, and even more preferably 85% by mass or more. Examples of polyethylene that can be used for the hook-and-loop fastener portion 180 include HDPE, MDPE, LDPE, and LLDPE, with LLDPE being preferred from the viewpoint of sealing properties. The material used for the hook-and-loop fastener portion 180 may contain multiple polyethylenes, or may partially contain other resins such as polypropylene, and other types of blends can be used from the viewpoints of cuttability, strength, and loop stiffness.

[0055] The hook-shaped engaging elements 181 have a pillar portion 181a and an engaging protrusion portion 181b, and are arranged at equal intervals in the MD direction. The pillar portion 181a is configured in a pillar shape rising approximately vertically from the fastener surface of the base portion 183. In this embodiment, the pillar portion 181a has a rectangular parallelepiped shape that is longer in the MD direction than in the TD direction. The engagement protrusion 181b is provided on the top of the column 181a and protrudes in a direction intersecting the rising direction of the column. In this embodiment, the engagement protrusion 181b protrudes in the TD direction, but may also protrude in the MD direction. Furthermore, the hook-shaped engaging elements 181 are arranged in multiple rows with the columnar engaging elements 182 sandwiched therebetween, and the positions of the hook-shaped engaging elements 181 in each row in the MD direction are intentionally shifted irregularly.

[0056] The columnar engaging elements 182 stand upright in a columnar shape from the fastener surface and are arranged at equal intervals in the MD direction. The columnar engaging elements 182 of this embodiment have a rectangular parallelepiped shape that is longer in the MD direction than in the TD direction. Furthermore, the columnar engaging elements 182 are arranged in multiple rows with the hook-shaped engaging elements 181 sandwiched therebetween, and the positions of the columnar engaging elements 182 in each row in the MD direction are intentionally shifted irregularly.

[0057] 9 is a diagram for explaining the dimensions of the hook-shaped engaging elements 181 and the columnar engaging elements 182 in the form of the hook-and-loop fastener A. FIG. 9 corresponds to an enlarged cross section of FIG. FIG. 10 is a diagram showing the dimensions d1 to d11 shown in FIG. 6 and FIG. In FIG. 10, the column of dimensional examples shows actual measured values ​​of the hook-and-loop fastener portion 180, and the column of preferred dimensional ranges shows preferred dimensional ranges that can be suitably used in the present invention.

[0058] The preferred dimensions of each part in the form of the hook-and-loop fastener A will be summarized below. The height d1 of the hook-shaped engaging element 181 is preferably 300 μm or more, and the height d1 of the hook-shaped engaging element 181 is preferably 700 μm or less. The height d1 of the columnar engaging element 182 is preferably 300 μm or more, and the height d1 of the columnar engaging element 182 is preferably 700 μm or less. The MD length d2 of the hook-shaped engaging element 181 is preferably 500 μm or more. Also, the MD length d2 of the hook-shaped engaging element 181 is preferably 700 μm or less. If it is shorter than the above range, the fitting strength will be weak, and if it is longer, the fitting strength will be too strong and the risk of the protrusion falling off will increase. The MD length d2 of the columnar engaging elements 182 is preferably 100 μm or more, and the MD length d2 of the columnar engaging elements 182 is preferably 300 μm or less.

[0059] The TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 100 μm or more, and the TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 350 μm or less. The TD width d3 of the columnar engaging elements 182 is preferably 100 μm or more, and the TD width d3 of the columnar engaging elements 182 is preferably 350 μm or less. The overall width d4 in the TD direction of the hook-shaped engaging element 181 is preferably 300 μm or more, and the width d4 in the TD direction of the hook-shaped engaging element 181 is preferably 950 μm or less.

[0060] The TD-direction protruding width d5 ​​of the engaging protrusion 181b is preferably 100 μm or more. Also, the TD-direction protruding width d5 ​​of the engaging protrusion 181b is preferably 300 μm or less. If it is narrower than the above range, the fitting strength is weakened, and if it is wider, the risk of the protrusion falling off increases. The return angle d6 of the engaging protrusion 181b is preferably 45° or more. Also, the return angle d6 of the engaging protrusion 181b is preferably 90° or less. If it is too small, the fitting strength will be too strong and the protrusion will be prone to falling off, and if it is too large, the protrusion will not be able to fit. Note that Fig. 9(a) shows the case where d6=90° shown in Figs. 5 to 8, and Fig. 9(b) shows a modified form where d6 is less than 90°.

[0061] The total thickness d7 of the hook-and-loop fastener tape used in the hook-and-loop fastener portion 180 is desirably 400 μm or more. Also, the total thickness d7 of the hook-and-loop fastener tape is desirably 1200 μm or less. The MD direction interval d8 of the hook-shaped engaging elements 181 is preferably 100 μm or more, and the MD direction width interval d8 of the hook-shaped engaging elements 181 is preferably 500 μm or less. The MD direction interval d8 of the columnar engaging elements 182 is preferably 100 μm or more, and the MD direction width interval d8 of the columnar engaging elements 182 is preferably 500 μm or less.

[0062] The TD directional interval d9 of the hook-shaped engaging elements 181 and the TD directional interval d9 of the columnar engaging elements 182 are both desirably 500 μm or more. Also, the TD directional interval d9 of the hook-shaped engaging elements 181 and the TD directional interval d9 of the columnar engaging elements 182 are both desirably 1000 μm or less. This is because if the TD directional interval d9 of the hook-shaped engaging elements 181 and the TD directional interval d9 of the columnar engaging elements 182 are smaller than the above range, the elements become dense, and if larger, the elements become sparse, making it difficult to fit them together.

[0063] The thickness d10 of the base 183 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness d10 of the base 183 is preferably 500 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. If the thickness d10 of the base 183 is thin, the amount of resin is small and the adhesion (bonding) of the hook-and-loop fastener is not achieved, and if the thickness d10 of the base 183 is thick, the loop stiffness becomes too strong. Also, the TD width of the hook-and-loop fastener part 180 is preferably 5 mm or more. Also, the TD width of the hook-and-loop fastener part 180 is preferably 20 mm or less. If it is narrower than the above range, the amount of resin is too small to achieve adhesion (bonding) as a hook-and-loop fastener, and if it is wider than the above range, the loop stiffness becomes too strong.

[0064] The TD direction distance d11 between the pillar portion 181a of the hook-shaped engaging element 181 and the pillar-shaped engaging element 182 is preferably 300 μm or more. Also, the TD direction distance d11 between the pillar portion 181a of the hook-shaped engaging element 181 and the pillar-shaped engaging element 182 is preferably 500 μm or less. If the TD direction distance d11 between the pillar portion 181a of the hook-shaped engaging element 181 and the pillar-shaped engaging element 182 is smaller than the above range, the elements become dense, and if it is larger, the elements become sparse, making it difficult to fit them together. The hook-and-loop fastener tape having the above-mentioned hook-shaped engaging elements and column-shaped engaging elements will also be referred to as hook-and-loop fastener A.

[0065] (Hook and loop fasteners B and C) The previously explained hook-and-loop fastener A has hook-shaped engaging elements and columnar engaging elements, but we have prepared a hook-and-loop fastener tape that does not have columnar engaging elements and is entirely made up of hook-shaped engaging elements (a hook-and-loop fastener tape having only hook-shaped engaging elements). Furthermore, for this hook-and-loop fastener tape having only hook-shaped engaging elements, we have prepared two types: one made mainly of PE (hereinafter also referred to as hook-and-loop fastener B) and one made mainly of PP (hereinafter also referred to as hook-and-loop fastener C). FIG. 11 is a perspective view of a hook-and-loop fastener portion 180 of hook-and-loop fasteners B and C. FIG. FIG. 12 is a plan view of the hook-and-loop fastener portion 180 in the hook-and-loop fastener B and C forms. FIG. 13 is a cross-sectional view of a hook-and-loop fastener portion 180 in the form of hook-and-loop fasteners B and C taken along the position of the arrow GG in FIG. FIG. 14 is an enlarged cross-sectional view of a hook-and-loop fastener portion 180 of the hook-and-loop fasteners B and C taken along the position of the arrow HH in FIG. FIG. 15 is a diagram showing the dimensions d1 to d10 shown in FIG. 12 and FIG. In FIG. 15, the column of dimensional examples shows actual measured values ​​of the hook-and-loop fastener tape, and the column of preferred dimensional ranges shows preferred dimensional ranges that can be suitably used in the present invention.

[0066] The preferred dimensions of each part in the hook-and-loop fasteners B and C are summarized below. The height d1 of the hook-shaped engaging element 181 is preferably 300 μm or more, and the height d1 of the hook-shaped engaging element 181 is preferably 700 μm or less. The MD length d2 of the hook-shaped engaging element 181 is preferably 500 μm or more. Also, the MD length d2 of the hook-shaped engaging element 181 is preferably 700 μm or less. If it is shorter than the above range, the fitting strength will be weak, and if it is longer, the fitting strength will be too strong and the risk of the protrusion falling off will increase.

[0067] The TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 100 μm or more, and the TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 350 μm or less. The overall width d4 in the TD direction of the hook-shaped engaging element 181 is preferably 300 μm or more, and the width d4 in the TD direction of the hook-shaped engaging element 181 is preferably 950 μm or less.

[0068] The TD-direction protruding width d5 ​​of the engaging protrusion 181b is preferably 100 μm or more. Also, the TD-direction protruding width d5 ​​of the engaging protrusion 181b is preferably 300 μm or less. If it is narrower than the above range, the fitting strength is weakened, and if it is wider, the risk of the protrusion falling off increases. The return angle d6 of the engaging protrusion 181b is preferably 45° or more. Also, the return angle d6 of the engaging protrusion 181b is preferably 90° or less. If it is too small, the fitting strength will be too strong and it will be easy to fall off, and if it is too large, it will not be possible to fit together. Note that Fig. 14(a) shows the case where d6=90° shown in Figs. 11 to 13, and Fig. 14(b) shows a modified form where d6 is less than 90°.

[0069] The total thickness d7 of the hook-and-loop fastener tape is preferably 400 μm or more, and 1200 μm or less. The MD direction interval d8 of the hook-shaped engaging elements 181 is preferably 100 μm or more, and the MD direction width interval d8 of the hook-shaped engaging elements 181 is preferably 500 μm or less.

[0070] The TD direction interval d9 of the hook-shaped engaging elements 181 is preferably 250 μm or more. Also, the TD direction interval d9 of the hook-shaped engaging elements 181 is preferably 500 μm or less. If the TD direction interval d9 of the hook-shaped engaging elements 181 is smaller than the above range, the elements become dense, and if it is larger, the elements become sparse, making it difficult to fit them together.

[0071] The thickness d10 of the base 183 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness d10 of the base 183 is preferably 500 μm or less, more preferably 400 μm or less, and even more preferably 300 μm or less. If the thickness d10 of the base 183 is thin, the amount of resin is small and the adhesion (bonding) of the hook-and-loop fastener is not achieved, and if the thickness d10 of the base 183 is thick, the loop stiffness becomes too strong. Also, the TD width of the hook-and-loop fastener part 180 is preferably 5 mm or more. Also, the TD width of the hook-and-loop fastener part 180 is preferably 20 mm or less. If it is narrower than the above range, the amount of resin is too small to achieve adhesion (bonding) as a hook-and-loop fastener, and if it is wider than the above range, the loop stiffness becomes too strong.

[0072] FIG. 16 is a diagram showing the state where the vicinity of the side gusset portion has been resealed. FIG. 17 is a diagram showing a state in which both the side gusset portion vicinity and the center vicinity have been resealed. As shown in FIG. 16, in the packaging container 101 of this embodiment, the hook-and-loop fastener part 180 is provided around the entire inner periphery of the opening, so that the side gusset parts can also be resealed reliably. In addition, since the hook-and-loop fastener portion 180 is sandwiched and sealed in the side seal portion 143, the area where joining begins when resealing is clearly defined, and the resealing operation can be started easily. As shown in Fig. 17, the opening can be completely resealed even near the center by using the hook-and-loop fastener 180. Note that in Figs. 16 and 17, the thickness of each part is exaggerated for the purpose of explanation, so it may appear as if a step is created due to the thickness of the gusset, but in reality, the thickness of the gusset does not adversely affect resealing.

[0073] Fig. 18 is a diagram showing a joined state of the hook-and-loop fastener part 180. Note that Fig. 18 illustrates the case of hook-and-loop fastener A, but in the case of hook-and-loop fasteners B and C, hook-shaped engaging elements are arranged instead of column-shaped engaging elements. When it is desired to open the packaging container 101, take out some of the contents, and store the rest, it is possible to reseal the packaging container 101 using the hook-and-loop fastener part 180. At this time, the hook-shaped engaging element 181 on one side is inserted into the gap between the hook-shaped engaging element 181 on the other side or the columnar engaging element 182, and the engaging elements come into contact with each other, fitting together and engaging detachably, so that the fastener surfaces of the hook-and-loop fastener part 180 are joined with an appropriate strength. Moreover, by peeling off the joined hook-and-loop fastener part 180, the joining between the two can be easily released, and the container can be reopened. In conventional resealable packaging containers using zipper tape, the male and female engaging parts must be precisely aligned and joined, and the resealing operation requires practice and careful work. However, the packaging container 101 of this embodiment uses hook-and-loop fastener part 180, which has the same fastener surface shape on both sides regardless of male or female, so the resealing operation can be performed easily and reliably.

[0074] FIG. 19 is a diagram showing the state in which the side gusset portions are fully extended to maximize the opening area of ​​the opening. In this embodiment, since the side gussets are provided up to the top end, a large opening area can be realized by effectively utilizing the side gussets, and the ease of removing the contents can be improved dramatically. Moreover, since the container is resealable as described above, a highly convenient packaging container can be provided.

[0075] (Loop stiffness of hook-and-loop fastener 180) In the configurations of the above embodiments, the hook-and-loop fastener section 180 is provided to make the packaging container resealable. Here, the hook-and-loop fastener section 180 is folded back at the side seal section 143. It is also folded in the same manner at the side gusset sections of the side films 124, 125. The hook-and-loop fastener tape used for the hook-and-loop fastener section 180 in the above embodiments is a resin molded product, and therefore unless it is appropriately configured, it has high rigidity and will easily return to its original shape even after opening, which may result in poor removal properties. Therefore, the hook-and-loop fastener tape used in the hook-and-loop fastener portion 180 of the packaging container 101 of the present invention is configured so that its bending rigidity (flexibility) is appropriately weak by setting the loop stiffness to an appropriate value.

[0076] Loop stiffness is a parameter that indicates the stiffness of a film such as a stretched plastic film. A method for measuring loop stiffness will be described below with reference to Figs. 20 to 25. Note that the measurement method described below will be used to measure the hook-and-loop fastener tape used in the hook-and-loop fastener portion 180 of the present invention.

[0077] FIG. 20 is a plan view showing the test piece 80 and the loop stiffness measuring instrument 85, and FIG. 21 is a cross-sectional view of the test piece 80 and the loop stiffness measuring instrument 85 of FIG. 20 along the line GG. The test piece 80 is a rectangular hook-and-loop fastener tape having a long side and a short side. In the present application, the length L1 of the long side of the test piece 80 is set to 150 mm, and the length L2 of the short side is set to the width of the hook-and-loop fastener tape (for example, 9.5 mm). As the loop stiffness measuring instrument 85, for example, No. 581 Loop Stiffness Tester (registered trademark) LOOP STIFFNESS TESTER DA type manufactured by Toyo Seiki Seisakusho Co., Ltd. can be used. The length L1 of the long side of the test piece 80 can be adjusted as long as the test piece 80 can be gripped by a pair of chuck parts 86 described later.

[0078] The loop stiffness measuring device 85 has a pair of chuck portions 86 for gripping a pair of ends in the long side direction of the test piece 80, and a support member 87 for supporting the chuck portions 86. The chuck portions 86 include a first chuck 861 and a second chuck 862. In the state shown in FIG. 20 and FIG. 21, the test piece 80 is placed on the pair of first chucks 861, and the second chuck 862 does not yet grip the test piece 80 between the first chuck 861 and the second chuck 862. As will be described later, during measurement, the test piece 80 is gripped between the first chuck 861 and the second chuck 862 of the chuck portions 86. The second chuck 862 may be connected to the first chuck 861 via a hinge mechanism.

[0079] A method for measuring the loop stiffness of the test piece 80 using the loop stiffness measuring device 85 will be described. First, as shown in FIG. 20 and FIG. 21, the test piece 80 is placed on the first chuck 861 of a pair of chuck parts 86 arranged with a gap L3 therebetween. In the present application, the gap L3 is set so that the length of the loop part 81 (hereinafter also referred to as the loop length) described later is 60 mm. The test piece 80 includes an inner surface 80x located on the first chuck 861 side and an outer surface 80y located on the opposite side of the inner surface 80x. The inner surface 80x and the outer surface 80y of the test piece 80 correspond to the inner surface side (the side where the engaging element is provided) and the outer surface side of the hook-and-loop fastener tape. When the loop part 81 described later is formed in the test piece 80, the inner surface 80x is located inside the loop part 81, and the outer surface 80y is located outside the loop part 81. 22, the second chuck 862 is placed on the test piece 80 so as to grip the end of the test piece 80 in the long side direction between the first chuck 861 and the second chuck 862. As shown in FIG.

[0080] Next, as shown in FIG. 23, at least one of the pair of chucks 86 is slid on the support member 87 in a direction in which the distance between the pair of chucks 86 is reduced. This allows the loop portion 81 to be formed in the test piece 80. The test piece 80 shown in FIG. 23 has a loop portion 81, a pair of intermediate portions 82, and a pair of fixing portions 83. The pair of fixing portions 83 are portions of the test piece 80 that are gripped by the pair of chucks 86. The pair of intermediate portions 82 are portions of the test piece 80 that are located between the loop portion 81 and the pair of intermediate portions 82. As shown in FIG. 23, the chuck portion 86 is slid on the support member 87 until the inner surfaces 80x of the pair of intermediate portions 82 come into contact with each other. This allows the loop portion 81 having a loop length of 60 mm to be formed. The loop length of the loop portion 81 is the length of the test piece 80 between position P1 where the surface of one second chuck 862 on the loop portion 81 side intersects with the test piece 80, and position P2 where the surface of the other second chuck 862 on the loop portion 81 side intersects with the test piece 80. When the thickness of the test piece 80 is ignored, the above-mentioned interval L3 is a value obtained by adding 2×t to the length of the loop portion 81, where t is the thickness of the second chuck 862 of the chuck portion 86.

[0081] Then, as shown in FIG. 24, the posture of the chuck portion 86 is adjusted so that the protruding direction Y of the loop portion 81 relative to the chuck portion 86 is vertical. For example, the posture of the chuck portion 86 supported by the support member 87 is adjusted by moving the support member 87 so that the normal direction of the support member 87 is horizontal. In the example shown in FIG. 24, the protruding direction Y of the loop portion 81 coincides with the thickness direction of the chuck portion. Also, a load cell 88 is prepared at a position separated by a distance Z1 from the second chuck 862 in the protruding direction Y of the loop portion 81. In this application, the distance Z1 is set to 50 mm. Next, the load cell 88 is moved toward the loop portion 81 of the test piece 80 at a speed V by a distance Z2 shown in FIG. 24. The distance Z2 is set so that the load cell 88 contacts the loop portion 81 and then pushes the loop portion 81 toward the chuck portion 86 side, as shown in FIG. 24 and FIG. 25. In the present application, the distance Z2 is set to 40 mm. In this case, the distance Z3 between the load cell 88 and the second chuck 862 of the chuck portion 86 when the load cell 88 is pressing the loop portion 81 toward the chuck portion 86 is set to 10 mm. The speed V at which the load cell 88 is moved is set to 3.3 mm / s, and the pressing holding time is set to 3 s.

[0082] 25, the load cell 88 is moved by a distance Z2 toward the chuck portion 86, and in a state in which the load cell 88 is pressing into the loop portion 81 of the test piece 80, the value of the load applied to the load cell 88 from the loop portion 81 becomes stable, and then the value of the load is recorded. The value of the load thus obtained is used as the loop stiffness of the film constituting the test piece 80. In this application, unless otherwise specified, the environment during the measurement of the loop stiffness is a temperature of 23°C and a relative humidity of 50%.

[0083] (Examples and Comparative Examples) A plurality of types of packaging containers 101 described in the above embodiment were produced as working examples, and further, a plurality of types of comparative examples were produced, and evaluations were performed on loop stiffness, practicality, and convenience. FIG. 26 shows a summary of the results of evaluation of loop stiffness, bondability, and ease of removal when resealing samples of multiple types of packaging containers. The evaluation shown in FIG. 26 was carried out for five examples of the present invention and nine comparative examples.

[0084] In the examples, the hook-and-loop fasteners A, B, and C described above were used. In each example, the hook-and-loop fastener A had a width in the TD direction of 9.5 mm, and the hook-and-loop fasteners B and C had a width in the TD direction of 13 mm. The conventional chuck member used in the comparative example had a male shape and a female shape that were aligned and fitted together, and was a 13 mm wide "PP-13RET" manufactured by TAKIRON C.I. Co., Ltd.

[0085] In the comparative example, since it is difficult to provide the chuck member on the entire circumference when the side gusset portion is provided, the chuck member is provided on a non-entire circumference. The method of providing the chuck member on a non-entire circumference will be described with reference to FIG. Fig. 27 is a diagram for explaining a form in which the chuck member is provided not all around. Fig. 27(a) shows an embodiment in which the chuck member is provided all around for comparison. When side gussets are provided, the form in Fig. 27(b) and the form in Fig. 27(c) are possible forms in which the chuck member is provided not all around. When the hook-and-loop fasteners were provided on the entire periphery, the hook-and-loop fasteners were provided on all of the inner surfaces A1 to A6 in FIG. 27(a). When the chuck member is provided not all around as in FIG. 27(b), the male shape of the chuck member is arranged on the inner surfaces B1 and B4 in FIG. 27(b), and the female shape of the chuck member is arranged on the inner surfaces B2 and B3. When the chuck members are provided on a non-full circumference in the form of FIG. 27(c), the male shape of the chuck member is arranged on the inner surface C1 in FIG. 27(c), and the female shapes of the chuck members are arranged on the inner surfaces C2, C3, and C4.

[0086] 26 was evaluated based on whether or not the side gussets could be sufficiently joined when resealed. Specifically, the evaluation was based on whether or not the hook-and-loop fasteners on side film 124 and side film 125 could be joined to the hook-and-loop fasteners on front film 121 or back film 122. A good result was evaluated as "◯" and an inadequate result was evaluated as "×." The evaluation of the ease of removal was based on the maximum opening area of ​​the opening, and a "good" was given to cases where the side gusset portion could be effectively used to form an opening as shown in Fig. 19, and an "x" was given to all other cases. In addition, for samples with an "x" in terms of joinability, evaluation of the ease of removal was deemed unnecessary and was indicated by a "-".

[0087] <Example 1> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm). The laminate was then attached with hook-and-loop fastener A all around and made into a packaging container having side gussets to produce Example 1.

[0088] <Example 2> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm). The laminate was then attached with hook-and-loop fastener B all around and made into a packaging container having side gussets to produce Example 2.

[0089] <Example 3> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP having a thickness of 30 μm. The laminate was then attached with hook-and-loop fastener C all around and made into a packaging container having side gussets to produce Example 3.

[0090] <Example 4> Example 4 was produced by laminating a laminate of 12 μm thick PET, 12 μm thick aluminum-vapor-deposited PET, and 60 μm thick LLDPE with a 15 μm thick PE layer, attaching hook-and-loop fastener A all around and forming a bag into a packaging container with side gussets.

[0091] <Comparative Example 1> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm). The laminate was fitted with a zipper member all around and made into a packaging container with a side gusset portion up to the top, producing Comparative Example 1. The side gusset portion could not be joined.

[0092] <Comparative Example 2> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP with a thickness of 30 μm. No side gussets were made at the attachment part, but a zipper member was attached so that there was no side gusset at the top and only a side gusset at the bottom, producing Comparative Example 2.

[0093] <Comparative Example 3> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm). The laminate was then made into a packaging container having side gussets all the way to the top using a zipper member not all the way around, to produce Example 3. The chuck member in this comparative example 3 was attached in the manner shown in FIG. 27(b).

[0094] <Comparative Example 4> A laminate of 12 μm thick PET, 12 μm thick aluminum-deposited PET, and 60 μm thick LLDPE laminated with 15 μm thick extruded PE was attached to the entire circumference of the laminate and made into a packaging container with side gussets to the top to produce Comparative Example 4. In Comparative Example 4, the side gussets could not be fitted together.

[0095] <Comparative Example 5> A laminate of 12 μm thick PET, 12 μm thick aluminum-vapor-deposited PET, and 60 μm thick LLDPE extruded and laminated with 15 μm thick PE was made into a packaging container with no side gusset at the attachment part, but a zipper member was attached so that there was no side gusset at the top and only a side gusset at the bottom, to produce Comparison Example 5.

[0096] <Comparative Example 6> A laminate of 12 μm thick PET, 12 μm thick aluminum-vapor-deposited PET, and 60 μm thick LLDPE laminated with 15 μm thick PE was made into a packaging container with side gussets extending to the top using a zipper member not all the way around, to produce Comparison Example 6. The chuck member in this Comparative Example 6 was attached in the manner shown in FIG. 27(b).

[0097] <Comparative Example 7> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm), and the laminate was made into a packaging container with a zipper member attached all around and a side gusset portion up to the top, to produce Comparative Example 7. In Comparative Example 7, the side gusset portion could not be joined.

[0098] <Comparative Example 8> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP with a thickness of 30 μm, and a laminate was made into a packaging container gusseted pouch with no side gusset at the attachment part, but a zipper member was attached so that there was no side gusset at the top and only a side gusset at the bottom, producing Comparative Example 8.

[0099] <Comparative Example 9> Paper (50g / m 2 ) was laminated with an adhesive onto an aluminum-deposited CPP (thickness: 30 μm). The laminate was then made into a packaging container having side gussets all the way to the top using a zipper member not all the way around, to produce Example 9. The chuck member in this Comparative Example 9 was attached in the manner shown in FIG. 27(b).

[0100] As shown in FIG. 26, the packaging containers using the hook-and-loop fastener parts of Examples 1 to 5 have good results in terms of both joining and removal. In addition, the loop stiffness of the hook-and-loop fastener tape is 7000 mN or less, so the folded shape is stably maintained. In addition, the shape stability of the folded shape is best in Examples 1 and 4 with a loop stiffness of 87 mN, followed by Example 2 with a loop stiffness of 1320 mN, and then Example 3 with a loop stiffness of 6054 mN. Therefore, when one hook-and-loop fastener tape is provided around the entire circumference of the inner surface of the side gusset, the loop stiffness of the hook-and-loop fastener tape is preferably 7000 mN or less, more preferably 1500 mN or less, and even more preferably 100 mN or less, as measured under the measurement conditions shown above (loop length 60 mm, push-in speed 3.3 mm / s, push-in holding time 3 s). The loop stiffness can be adjusted by appropriately changing the thickness of the base 183 or the material of the hook-and-loop fastener. For example, the loop stiffness can be reduced by reducing the thickness of the base 183. In addition, the loop stiffness can be reduced by using PE as the material of the hook-and-loop fastener. In contrast, in the case of using a conventional chuck member, there were problems with joining, and even if joining was possible, the opening was narrow and removal was not easy, so satisfactory results were not obtained.

[0101] In addition, the bonding strength when the fastener surfaces of the hook-and-loop fastener tape are bonded together also has a large effect on the ease of use when re-opening a resealed packaging container. Therefore, the hook-and-loop fastener tape used in the packaging container 101 of the present invention is configured to have an appropriate bonding strength.

[0102] FIG. 28 is a diagram showing a method for measuring the bonding strength of a hook-and-loop fastener tape. The bonding strength of the hook-and-loop fastener tape is measured by chucking the non-bonded portion of the hook-and-loop fastener tape with chucks 91 and 92 of a tensile tester as shown in FIG. 28, performing a tensile test, and measuring the bonding strength in T-shaped peeling. FIG. 28 shows the state during measurement in the TD direction. In the case of FIG. 28, a test piece 90 is set so that the left-right direction in FIG. 28 corresponds to the TD direction. The length of the test piece 90 in the TD direction is the width of the hook-and-loop fastener tape (for example, 9.5 mm), and the length in the depth direction (MD direction) of the paper in FIG. 28 is 15 mm. If the test piece 90 is set so that the left-right direction in FIG. 28 corresponds to the MD direction, the bonding strength in the MD direction can be measured. In this case, the length in the TD direction is the width of the hook-and-loop fastener tape (for example, 9.5 mm). The initial chuck distance is 5 mm when measuring in the TD direction, and 30 mm when measuring in the MD direction. The tensile speed is 50 mm / min.

[0103] FIG. 29 shows the results of actual measurements of the bonding strength of the above-mentioned hook-and-loop fastener tape. FIG. 29 is a diagram showing the results of measuring the joining strength of hook-and-loop fasteners A, B, and C. For hook-and-loop fastener A, the measured value of the bonding strength in the MD direction was 0.32 N, which was converted into a value per unit width of 0.03 N / mm, and the measured value of the bonding strength in the TD direction was 0.355 N, which was converted into a value per unit width of 0.04 N / mm. For hook-and-loop fastener B, the measured value of the bonding strength in the MD direction was 0.09 N, which was converted into a unit width value of 0.01 N / mm, and the measured value of the bonding strength in the TD direction was 0.868 N, which was converted into a unit width value of 0.06 N / mm. For hook-and-loop fastener C, the measured value of the bonding strength in the MD direction was 3.5 N, which was converted into a value per unit width of 0.27 N / mm, and the measured value of the bonding strength in the TD direction was 1.617 N, which was converted into a value per unit width of 0.12 N / mm.

[0104] As shown in FIG. 29, although the bonding strength differs depending on the type of hook-and-loop fastener, any hook-and-loop fastener can be used without any problems in terms of openability, and sufficient bonding strength is ensured, so that the bond is not accidentally released. Therefore, the bonding strength of the hook-and-loop fastener tape in the TD direction is desirably 0.2 N or more under the above measurement conditions with a MD width of 15 mm. Also, the bonding strength of the hook-and-loop fastener tape in the TD direction is desirably 1.7 N or less under the above measurement conditions with a MD width of 15 mm. Also, the bonding strength of the hook-and-loop fastener tape in the TD direction is more desirably 0.9 N or less. Also, in the case of hook-and-loop fastener A only, the bonding strength of the hook-and-loop fastener tape in the TD direction is desirably 0.5 N or less. The bonding strength in the TD direction of conventional zipper members (zipper tapes) differs between the opening side and the contents side, and under the above measurement conditions with a width of 15 mm in the MD direction, it is about 3 N to 6 N from the opening side and about 12 N to 18 N from the contents side. In contrast, the hook-and-loop fasteners used in the present invention have no directionality in bonding strength, and can be opened with less force than conventional zipper members.

[0105] As described above, packaging container 101 of this embodiment is provided with side gussets up to the opening at the top, and hook-and-loop fastener section 180 is provided around the entire inner periphery of the opening. As a result, packaging container 101 of this embodiment has good resealing adhesion, and since the side gussets can be effectively utilized, the opening area of ​​the opening is wide, and removal can be facilitated, making it a very convenient packaging container.

[0106] (Variations) The present invention is not limited to the above-described embodiment, and various modifications and variations are possible, and these are also within the scope of the present invention.

[0107] (1) In the embodiment, an example has been described in which the side gusset portion is configured by forming the side seal portion 143 and joining the side films 124, 125 to the front film 121 and the back film 122. This is not limiting, and for example, the front film 121, the back film 122, and the side films 124, 125 may all be configured as a single laminated film, and may be joined by sealing on the back side, for example. In this case, by forming a crease, a configuration similar to the configuration of the front film 121, the back film 122, and the side films 124, 125 can be achieved.

[0108] (2) In the embodiment, the specific shape and material of the hook-and-loop fastener can be changed as appropriate. For example, the hook-shaped engaging elements may have a plurality of different shapes, and the arrangement and ratio of the hook-shaped engaging elements and the columnar engaging elements can also be changed as appropriate.

[0109] (3) In the embodiment, the hook-and-loop fastener portion 180 is described as being provided without any breaks using a single hook-and-loop fastener tape. However, the present invention is not limited to this, and for example, appropriate breaks may be provided within a range that does not cause problems in terms of joining. Therefore, the hook-and-loop fastener portion 180 may be configured by arranging a plurality of hook-and-loop fasteners.

[0110] (4) In the embodiment, an example has been described in which the hook-and-loop fastener portion 180 is provided around the entire periphery. However, the present invention is not limited to this, and for example, there may be some portions where the hook-and-loop fastener is not provided, as long as no problems arise in the bonding. It is sufficient that the hook-and-loop fastener is provided at least in the area where the front film 121 and the back film 122 overlap with the side films 124 and 125.

[0111] (5) In the embodiment, the front film 121 is the first packaging material part, the back film 122 is the second packaging material part, and the side films 124, 125 are the side gusset parts, which are joined together to form a connected configuration. However, the present invention is not limited to this, and may be, for example, a so-called side gusset pillow pouch. 30 is a cross-sectional view showing an embodiment in which the present invention is applied to a side gusset pillow pouch, which is a view equivalent to a cross section shown in FIG. As shown in Fig. 30, the first packaging material section, the second packaging material section, and the side gusset section may be formed from a single packaging film 120. In this case, for example, a hook-and-loop fastener section 180 may be provided around the entire inner periphery. Note that Fig. 30(a) shows an example in which the hook-and-loop fastener section 180 is also sandwiched at the joint section 145, but as shown in Fig. 30(b), the hook-and-loop fastener section 180 may not be provided at the joint section 145.

[0112] (6) In the embodiment, an example has been described in which the hook-and-loop fastener portion 180 is disposed around the entire inner periphery of the packaging container. However, the present invention is not limited to this, and the hook-and-loop fastener portion 180 may be provided on only a part of the inner periphery of the packaging container. FIG. 31 is a diagram showing a form in which a hook-and-loop fastener part 180 is provided on a part of the inner circumference of a packaging container. 31(a), hook-and-loop fastener portions 180 may be provided independently on the inner surfaces of front film 121, back film 122, side film 124, and side film 125. In this case, a gap may be formed between adjacent hook-and-loop fastener portions. As shown in Figure 31(a), in a configuration in which there is a gap between adjacent hook-and-loop fastener portions, the airtightness is reduced compared to when there is no gap, and this is effective when removing the air inside while keeping the resealing function active or when draining water. Also, for example, as shown in FIG. 32(b), hook-and-loop fastener portion 180 may be provided near the center of the inner surface of front film 121 and back film 122, that is, only at a position that does not overlap side films 124 and 125. As shown in FIG. 31(b), in a configuration in which a gap is provided between adjacent hook-and-loop fastener portions, a minimum resealing function is provided, and the amount of hook-and-loop fastener tape used can be reduced, thereby reducing manufacturing costs. Furthermore, for example, as shown in FIG. 32(c), hook-and-loop fastener portions 180 may be provided in an independent form in the areas where side films 124 and 125 overlap with front film 121 and back film 122, respectively, and in the areas where side films 124 and 125 overlap with each other. As shown in Figure 31(c), in a configuration in which a gap is provided between adjacent hook-and-loop fastener portions, only the side gusset portion (gusset portion) can be closed, making it possible to adjust the opening width in order to adjust the amount of contents that can be removed.

[0113] The embodiments and modifications may be used in appropriate combination, but detailed description thereof will be omitted. The present invention is not limited to the embodiments described above. [Explanation of symbols]

[0114] 101 Packaging containers 102 Storage unit 106 Container body 107 Notch 121 Surface Film 122 Back film 124 Side Film 125 Side Film 131 Top 132 Bottom 133 Side 136 Folded part 137 Folded part 141 Upper seal part 142 Bottom seal 143 Side seal 160 Laminated Film 161 Base material layer 162 Picture layer 163 Middle Class 164 Sealant Layer 165 Bonding layer 180 Hook and loop fastener section 181 Hook-shaped engagement element 181a Column 181b Engagement protrusion 182 Pillar-shaped engagement element 183 Base

Claims

1. A packaging container having a first edge, a second edge opposite the first edge, and a side portion intersecting the first edge and the second edge, a first packaging material part; A second packaging material portion disposed opposite the first packaging material portion; A side gusset portion connected to the side portions of the first packaging material portion and the second packaging material portion; Equipped with The side gusset portion is provided from the first edge to the second edge, a hook-and-loop fastener formed of a single hook-and-loop fastener tape, both of which have hook-shaped engaging elements on their opposing inner surfaces and which can be folded back to join, is provided around the entire periphery of both the inner surfaces of the first packaging material portion and the second packaging material portion near the first edge and the inner surface of the side gusset portion; A packaging container in which the first packaging material portion, the second packaging material portion, and the side gusset portion are formed by a single sheet of packaging material.

2. The packaging container according to claim 1, The loop stiffness of the hook-and-loop fastener alone is 7000 mN or less under the conditions of a loop length of 60 mm, a pushing speed of 3.3 mm / s, and a pushing holding time of 3 s. A packaging container characterized by:

3. The packaging container according to claim 1 or 2, The hook-and-loop fastener further includes a plurality of columnar engaging elements arranged vertically from the fastener surface; A packaging container characterized by:

4. In the packaging container according to any one of claims 1 to 3, The first packaging material portion, the second packaging material portion, and the side gusset portion are formed of a laminate film having at least a base material layer and a sealant layer, A storage section capable of storing contents; A seal portion formed around the housing portion; A sealing portion is provided to be sealed after the content is accommodated therein; A packaging container characterized by:

Images