JP7635601B2 - Packaging Containers - Google Patents

Description

The present invention relates to a packaging container with a resealable function.

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 in which 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 portion with a concave-convex shape. However, the zipper member requires that the fitting portion, 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.
However, because hook-and-loop fasteners contain a large amount of resin and are highly rigid, they tend to return to their original shape even after opening, making them difficult to remove.

JP 2017-77916 A

The objective of the present invention is to provide a packaging container that is easy to keep open and has a resealing function that allows for easy removal.

The present invention solves the above problems by the following means. Note that, for ease of understanding, the following description will use symbols corresponding to the embodiments of the present invention, but the present invention is not limited to these.

The first invention is a packaging container (101, 101B, 101C, 101D) having at least a first edge (131) and a second edge (132) opposite the first edge (131), and is provided with hook-and-loop fasteners (180A, 180B) arranged on both opposing inner surfaces near the first edge (131), and the hook-and-loop fasteners (180A, 180B) are hook-and-loop fasteners (180A, 180B) on both opposing inner surfaces that include hook-shaped engaging elements (181).

The second invention is a packaging container (101, 101B, 101C, 101D) having at least a first edge (131) and a second edge (132) opposite the first edge (131), and is provided with hook-and-loop fasteners (180A, 180B) arranged on both opposing inner surfaces at a position near the first edge (131), both opposing inner surfaces of the hook-and-loop fasteners (180A, 180B) including hook-shaped engaging elements (181), and the hook-and-loop fasteners (180A, 180B) can be folded back to join the packaging container (101, 101B, 101C, 101D).

The third invention is a packaging container (101, 101B, 101C, 101D) according to the first or second invention, characterized in that the loop stiffness of the hook-and-loop fastener (180A, 180B) alone is 5000 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.

The fourth invention is a packaging container (101, 101B, 101C, 101D) according to any one of the first to third inventions, characterized in that the hook-and-loop fastener (180A, 180B) further comprises an array of a plurality of columnar engaging elements (182) rising from the fastener surface.

The fifth invention is a packaging container (101, 101B, 101C, 101D) according to any one of the first to fourth inventions, characterized in that the packaging container (101, 101B, 101C, 101D) has a surface film (121) and a back film (122) made of a laminated film (160) having at least a base layer (161) and a sealant layer (164), a storage section (102) capable of storing contents, a seal section (141, 142, 143) formed around the storage section (102), and a section to be sealed that is to be sealed after storing the contents.

The present invention provides a packaging container that is easy to hold open and has a resealing function that allows for easy removal.

FIG. 2 is a plan view of the packaging container 101 of the first embodiment. 2 is a cross-sectional view of the packaging container 101 taken along the line AA in FIG. 1. 1 is a cross-sectional view of a laminated film 160 used in the packaging container 101 of the present embodiment. FIG. 2 is a perspective view of a hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A. FIG. 2 is a plan view of a hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A. 6 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A, taken along the position of the arrow BB in FIG. 5. 6 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A, taken along the position of the arrow CC in FIG. 5. 13 is a diagram for explaining the dimensions of a hook-shaped engaging element 181 and a columnar engaging element 182 in the form of a hook-and-loop fastener A. FIG. FIG. 9 is a diagram showing the dimensions d1 to d11 shown in FIGS. 5 and 8. 13 is a perspective view of a hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener B or C. FIG. 1 is a plan view of hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener B or C. FIG. 12 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) of the hook-and-loop fastener B or C type taken along the line GG in FIG. 12 is an enlarged cross-sectional view of the hook-and-loop fastener tape 180A (180B) of the hook-and-loop fastener B or C type taken along the line HH in FIG. 11. FIG. 14 is a diagram showing the dimensions d1 to d10 shown in FIGS. 11 and 13. FIG. 1 is a diagram showing a state in which the packaging container 101 is opened. FIG. 13 is a diagram showing the packaging container 101 after being resealed. 13 is a diagram showing a state in which the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B are joined together. FIG. FIG. 11 is a plan view of a packaging container 101B according to a second embodiment. 19 is a cross-sectional view of the packaging container 101B taken along the arrow DD in FIG. 18. FIG. 11 is a plan view of a packaging container 101C according to a third embodiment. 21 is a cross-sectional view of the packaging container 101C taken along the arrow EE in FIG. 20. FIG. 13 is a plan view of a packaging container 101D according to a fourth embodiment. 23 is a cross-sectional view of the packaging container 101D taken along the arrow FF in FIG. 22. FIG. 11 is a perspective view showing a packaging container 101D of a fourth embodiment in an unopened state. FIG. 13 is a diagram showing the packaging container 101D in an opened state. FIG. 2 is a plan view showing an example of a loop stiffness measuring device. FIG. 27 is a cross-sectional view of the loop stiffness measuring device of FIG. 26 taken along line G-G. FIG. 1 is a diagram for explaining a process of attaching a test piece to a loop stiffness measuring device. FIG. 13 is a diagram for explaining a step of forming a loop portion in a test piece. FIG. 13 is a diagram for explaining a process of applying a load to a loop portion of a test piece. FIG. 13 is a diagram for explaining a process of applying a load to a loop portion of a test piece. This is a diagram summarizing the results of creating samples of multiple types of packaging containers and evaluating the loop stiffness, removal property, and opening retention property of the hook-and-loop fastener tape. 4A and 4B are diagrams showing a method for measuring the bonding strength of hook-and-loop fastener tapes 180A and 180B. FIG. 13 is a diagram showing the results of measuring the bonding strength of hook-and-loop fasteners A, B, and C.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
The packaging container according to the present invention may be a bag-shaped container such as a pouch, and may be, for example, a flat pouch (a square pouch), a stand pouch, a box pouch, or the like.

(First embodiment: four-sided pouch)
Fig. 1 is a plan view of a packaging container 101 of the first embodiment. In Fig. 1, the sealed areas are indicated by hatching, and the same is true in the drawings of the other embodiments.
FIG. 2 is a cross-sectional view of the packaging container 101 taken along the line AA in FIG.
1 and 2, the figures shown below are schematic views, and the size and shape of each part are exaggerated or omitted as appropriate for ease of understanding. For example, in Fig. 2, only the base layer 161 and the sealant layer 164 are shown, and other layers are omitted.
In the following description, specific numerical values, shapes, materials, etc. are given, but these can be changed as appropriate.

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

(Container body)
1, the container body 106 of the packaging container 101 is a bag-like container in the form of a so-called flat pouch sealed on all four sides, and is made of a flexible laminated film (packaging material). The laminated film constituting the container body 106 includes a surface film 121 that forms the surface, and a back film 122 that forms the back surface.

In this embodiment, the front film 121 and the back film 122 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, or top edges may include curved portions. In addition, the corners of the laminated film may be rounded in an outwardly convex arc shape.

In addition, the front film 121 and the back film 122 may be separate laminated films or may be joined laminated films before the container body 106 is formed. The joined laminated films are folded to form the front film 121 and the back film 122.

In this embodiment, the container body 106 is formed by a front film 121 and a back film 122 that are individually configured.
At the upper portion (first edge) 131 of the container body 106, the upper portion of the front film 121 and the upper portion of the back film 122 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 that joins the upper portion of the front film 121 and the upper portion of the back film 122.

At the side 133 of the container body 106, the side of the front film 121 and the side of the back film 122 are joined by heat sealing. By this joining, a side seal portion 143 is formed on each of the left and right side portions 133 of the container body 106 as a seal portion joining the side of the front film 121 and the side of the back film 122. 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 106 to form an opening OP (see FIG. 15).
The notch 107 is provided to separate the upper seal portion 141 from the container body 106 to open the packaging container 101. The notch 107 is a cut provided on the upper end side of the side seal portion 143, below the upper seal portion 141, and approximately parallel to the upper seal portion 141, and is provided from the edge of the side portion 133 of the container body 106 to the storage portion 102 side so as not to penetrate into the storage portion 102. Note that an easy-open line such as a half-cut line may be provided instead of the notch 107 or together with the notch 107.

The bottom of the front film 121 and the bottom of the back film 122 are joined at the bottom (second edge) 132 of the container body 106. 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.

Before the contents are stored in the container body 106, at least one of the top seal portion 141, bottom seal portion 142, and side seal portion 143 is in an unsealed sealed state, and after the contents are stored in the storage portion 102 through this sealed portion, the sealed portion can be heat sealed (joined) to seal the contents.

(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 and the back film 122 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 and the back film 122. 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 on the portion that is to become the inside 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 this embodiment, the base material layer 161, which serves as the printing base material, is provided in a portion that is closer to the container outer side than the sealant layer 164. Note that only the base material layer 161 and the sealant layer 164 are shown in Fig. 2, and other layers are omitted, and this also applies to other figures. Furthermore, the laminated film 160 may be configured to include other layers 163 to impart various functions according to the application, as necessary.

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.

Preferably, the base layer 161 is biaxially stretched. This causes the molecules constituting the base layer 161 to align in the stretching direction by the stretching process, so that the base layer 161 exhibits excellent dimensional stability. In addition, the biaxial stretching process can impart easy-opening properties to the base layer 161.

The thickness of such a base material layer 161 is, for example, about 10 to 50 μm. In this case, the heat resistance required for the container body 106 can be satisfied while the production cost can be reduced. Note that the base material layer 161 of this embodiment also functions as the layer of the laminated film 160 that is the outermost layer of the container when the container body 106 is made into a bag.

As shown in FIG. 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, letters, 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 have the pattern layer 162, in which case various indications may be made, for example, by attaching a label.

In this embodiment, the pattern layer 162 is applied to the inner surface of the base material layer 161, rather than to the outer surface of the base material layer 161 which faces the outside 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 seen through the base material layer 161 when the packaging container 101 is made into a bag.

As described above, the sealant layer 164 is provided to overlap two laminated films 160 and heat seal the areas near the opposing edges to bond and seal the edges. In this embodiment, the sealant layer 164 is disposed on the side of the laminated film 160 that will be closest to the inside of the container when the film is made into a bag to form the container body 106.

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

In addition, 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) that mainly contains non-oriented polypropylene (CPP), or a linear low-density polyethylene layer (LLDPE layer) that mainly contains linear low-density polyethylene (LLDPE).

The thickness of the sealant layer 164 is preferably 30 μm or more. The thickness of the sealant layer 164 is preferably 200 μm or less. In this case, the package container 101 has excellent impact resistance against dropping during distribution, and is also easy to handle, such as easy filling and refilling of the contents.

On the other hand, the other layer 163 can be provided to supplement various functions depending on the application, and its placement position can be selected appropriately. 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 the concealment property 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, etc.

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.

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.

The metal alkoxide is at least one type of metal alkoxide represented by the general formula _R1nM ( ^OR2 ) _m (wherein, _R1 and _R2 represent 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 in the metal alkoxide include silicon, zirconium, titanium, aluminum, and others. For example, it is preferable to use an alkoxysilane in which M is Si.

The above alkoxysilane is, for example, one 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. Specific examples of the above alkoxysilane include 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 , and the like. The above alkoxides may be used in combination of two or more kinds.

As the silane coupling agent, those having reactive groups such as vinyl groups, epoxy groups, methacryl groups, 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.

In particular, the crosslink density of the cured film of the organic coating layer using bifunctional compounds such as γ-glycidoxypropylmethyldimethoxysilane and γ-glycidoxypropylmethyldiethoxysilane is lower than the crosslink density of a system using trialkoxysilane. Therefore, while the film has excellent gas barrier properties and hot water treatment resistance, it also becomes a flexible cured film and has excellent bending resistance, so that the gas barrier properties of packaging materials using this barrier film are unlikely to deteriorate even after the Gelbo flex test.

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.

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.

The base layer 161 may also be made of paper. When the base layer 161 is made of paper, the pattern layer 162 may be provided on the outer surface side of the base layer 161, which is the outer side of the container. The paper used for the base layer 161 may preferably have a basis weight of 30 g/m ² or more. The paper used for the base layer 161 may preferably have a basis weight of 150 g/m ² or less. The paper used for the base layer 161 may more preferably have a basis weight of 130 g/m ² or less. The paper used for the base layer 161 may more preferably have a basis weight of 100 g/m ² or less.

As shown in FIG. 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 the gas barrier layer is provided as the other layer 163, and between the base material layer 161 on which the gas barrier layer is provided as the other layer 163 and the sealant layer 164. For example, an adhesive commonly used in the dry lamination method known per se can be used as the bonding layer 165, 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.

Alternatively, an adhesive resin layer generally used in the extrusion lamination method (sandwich lamination method) can be used as the bonding layer 165. Examples of thermoplastic resins that can be used for the adhesive resin layer include polyethylene-based resins, polypropylene-based resins, cyclic polyolefin-based resins, copolymer resins, modified resins, or mixtures (including alloys) that contain these resins as main components. 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 copolymers (EVA), ethylene-acrylic acid copolymers (EAA), ethylene-ethyl acrylate copolymers (EEA), ethylene-methacrylic acid copolymers (EMAA), ethylene-methyl methacrylate copolymers (EMMA), ethylene-maleic acid copolymers, ionomer resins, and 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 in order to improve adhesion between layers. 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.

As a preferred embodiment of the laminated film 160, the following layer structure can be exemplified, in order from the base layer 161 side.
(A) First substrate layer/sealant layer (B) First substrate layer/second substrate layer/sealant layer (C) First substrate layer/second substrate layer/third substrate layer/sealant layer Specific examples of the laminate 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/vapor-deposited inorganic oxide layer/organic coating layer/PET thickness 12 μm/CPP layer thickness 70 μm
(4) PET thickness 12 μm/vapor-deposited inorganic oxide 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 (50 g/m ² )/aluminum vapor deposition layer/CPP thickness 30 μm
(7) Paper (150 g/m ² )/PET (thickness 12 μm)/vapor-deposited inorganic oxide layer/organic coating layer/LDPE (thickness 30 μm)

The hook-and-loop fastener portion 180 is provided above the storage portion 102 and below the notch 107, and is a portion that allows resealing after opening. It can be composed of a pair of hook-and-loop fastener tapes (hook-and-loop fasteners) arranged opposite each other. The hook-and-loop fastener portion 180 extends along the upper portion 131, and the hook-and-loop fastener tape 180A is heat-pressed to the inner side of the front film 121, and the hook-and-loop fastener tape 180B is heat-pressed to the inner side of the back film 122. Unlike conventional hook-and-loop fastener tapes with a male and female distinction, the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B are hook-and-loop fastener tapes of the same configuration, and there is no difference in shape of the fastener surface (engagement surface). Therefore, the hook-and-loop fastener portion 180 of the above configuration is configured to be joined by folding back one hook-and-loop fastener itself, that is, the hook-and-loop fastener tape 180A itself or the hook-and-loop fastener tape 180B itself. In addition, in this embodiment, the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B are shown as hook-and-loop fastener tapes of the same configuration, but for example, hook-and-loop fasteners having the same configuration but with a partially different shape may be used. Note that the term "same configuration" does not refer to completely identical shapes or dimensions, but also includes those that are partially missing or deformed, or have different dimensions. Here, the range in which the difference in dimensions can be considered to be the same configuration even if the dimensions are different is within a range of ±10%, and more preferably within a range of ±5%. The dimensions referred to here refer to d3, d4, d5, and d6.

(Hook and loop fastener A)
In this embodiment, three types of hook-and-loop fasteners, hook-and-loop fasteners A, B, and C, are shown as specific examples of the hook-and-loop fastener portion 180.
FIG. 4 is a perspective view of a hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A. FIG.
FIG. 5 is a plan view of a hook-and-loop fastener tape 180A (180B) in the form of hook-and-loop fastener A. FIG.
FIG. 6 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) in the form of the hook-and-loop fastener A, taken along the position of the arrow BB in FIG.
FIG. 7 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) in the form of the hook-and-loop fastener A, taken along the position of the arrow CC in FIG.
In addition, the direction indicated by the arrow MD in FIG. 4 and FIG. 5 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 tape 180A (180B) has a plurality of hook-shaped engaging elements 181 and a plurality of columnar engaging elements 182 arranged on the fastener surface where the two are engaged with each other in an opposed manner.

The hook-and-loop fastener tape 180A (180B) is preferably made mainly of polyethylene. Specifically, it is preferable that the hook-and-loop fastener tape 180A (180B) contains 50% or more by weight of polyethylene, more preferably 70% or more by weight, and even more preferably 85% or more by weight of polyethylene.
Examples of polyethylene that can be used for the hook-and-loop tape 180A (180B) include HDPE, MDPE, LDPE, and LLDPE, with LLDPE being preferred from the viewpoint of sealing properties. The material used for the hook-and-loop tape 180A (180B) may contain multiple polyethylenes, or may partially contain other resins such as polypropylene, and other types of blends may be used from the viewpoints of cuttability, strength, and loop stiffness.

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 engaging 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 engaging protrusion 181b protrudes in the TD direction, but may also protrude in the MD direction.
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 are intentionally irregularly shifted in the MD direction. When the hook-shaped engaging elements 181 are joined to the surface fastener, the hook-shaped engaging elements 181 can be freely inserted into and removed from the gaps between the other hook-shaped engaging elements 181, and joining is performed by the engaging action of the engaging protrusions 181b.

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

8 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. 8 corresponds to an enlarged cross section of FIG.
FIG. 9 is a diagram showing the dimensions d1 to d11 shown in FIG. 5 and FIG.
In FIG. 9, the column of dimensional examples shows actual measured values of the hook-and-loop fastener tapes 180A and 180B, and the column of preferred dimensional ranges shows preferred dimensional ranges that can be suitably used in the present invention.

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.

The TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 100 μm or more. Also, the TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 350 μm or less.
The columnar engaging element 182 preferably has a TD width d3 of 100 μm or more, and more preferably has a TD width d3 of 350 μm or less.
The hook-shaped engaging element 181 preferably has a total TD width d4 of 300 μm or more. Also, the hook-shaped engaging element 181 preferably has a total TD width d4 of 950 μm or less.

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 than the above range, 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 the return angle d6 is too small, the fitting strength will be too strong and the protrusion will be prone to falling off, and if the return angle is too large, the protrusion will not be able to fit. Note that Fig. 8(a) shows the case where d6 = 90° shown in Figs. 4 to 7, and Fig. 8(b) shows a modified form where d6 is less than 90°.

The total thickness d7 of the hook-and-loop fastener tape is preferably 400 μm or more. Also, the total thickness d7 of the hook-and-loop fastener tape is preferably 700 μm or less.
The MD direction interval d8 of the hook-shaped engaging elements 181 is preferably 100 μm or more. Also, 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. Also, the MD direction width interval d8 of the columnar engaging elements 182 is preferably 500 μm or less.

The TD-direction spacing d9 of the hook-shaped engaging element 181 and the TD-direction spacing d9 of the columnar engaging element 182 are both preferably 500 μm or more. Also, the TD-direction spacing d9 of the hook-shaped engaging element 181 and the TD-direction spacing d9 of the columnar engaging element 182 are both preferably 1000 μm or less. If the TD-direction spacing d9 of the hook-shaped engaging element 181 and the TD-direction spacing d9 of the columnar engaging element 182 are smaller than the above range, the elements will be dense, and if they are larger, the elements will be sparse and fitting will be difficult.

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 therefore 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.
The TD width of the hook-and-loop fastener tape 180A (180B) is preferably 5 mm or more. The TD width of the hook-and-loop fastener tape 180A (180B) 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.

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 be referred to as hook-and-loop fastener A.

(Hook-and-loop fasteners B and C)
The hook-and-loop fastener A described above 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). 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. 10 is a perspective view of the hook-and-loop fastener tape 180A (180B) in the hook-and-loop fastener B or C type.
FIG. 11 is a plan view of the hook-and-loop fastener tape 180A (180B) in the hook-and-loop fastener B or C form.
FIG. 12 is a cross-sectional view of the hook-and-loop fastener tape 180A (180B) of the hook-and-loop fastener B or C type taken along the position of the arrow G--G in FIG.
FIG. 13 is an enlarged cross-sectional view of the hook-and-loop fastener tape 180A (180B) of the hook-and-loop fastener type B or C taken along the position of the arrow HH in FIG.
FIG. 14 is a diagram showing the dimensions d1 to d10 shown in FIG. 11 and FIG.
In FIG. 14, the column of dimensional examples shows actual measured values of the hook-and-loop fastener tapes 180A and 180B, and the column of preferred dimensional ranges shows preferred dimensional ranges that can be suitably used in the present invention.

The preferred dimensions of each part in the hook-and-loop fasteners B and C will be described 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.

The TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 100 μm or more. Also, the TD width d3 of the pillar portion 181a of the hook-shaped engaging element 181 is preferably 350 μm or less.
The hook-shaped engaging element 181 preferably has a total TD width d4 of 300 μm or more. Also, the hook-shaped engaging element 181 preferably has a total TD width d4 of 950 μm or less.

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 than the above range, 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 the return angle d6 is too small, the fitting strength will be too strong and the protrusion will be prone to falling off, and if the return angle is too large, the protrusion will not be able to fit. Note that Fig. 13(a) shows the case where d6 = 90° shown in Figs. 10 to 12, and Fig. 13(b) shows a modified form where d6 is less than 90°.

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

The TD direction spacing d9 of the hook-shaped engaging elements 181 is preferably 250 μm or more. Also, the TD direction spacing d9 of the hook-shaped engaging elements 181 is preferably 500 μm or less. If the TD direction spacing d9 of the hook-shaped engaging elements 181 is smaller than the above range, the elements will be dense, and if it is larger, the elements will be sparse and fitting will be difficult.

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 therefore 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.
The TD width of the hook-and-loop fastener tape 180A (180B) is preferably 5 mm or more. The TD width of the hook-and-loop fastener tape 180A (180B) 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.

The packaging container 101 having the above-described configuration is shipped with the entire periphery sealed, for example, with contents (not shown) accommodated in the accommodation portion 102 .
FIG. 15 is a diagram showing the packaging container 101 in an opened state.
A user who has purchased the product can use the notch 107 to separate the upper seal portion 141 from the container body portion 106, open the packaging container 101, form an opening OP, and remove the contents. When the packaging container 101 is opened, the upper part of the storage portion 102 is opened.

FIG. 16 is a diagram showing the packaging container 101 in a resealed state.
Fig. 17 is a diagram showing a state in which a hook-and-loop fastener tape 180A and a hook-and-loop fastener tape 180B are joined together. Note that Fig. 17 illustrates the case of the hook-and-loop fastener A, but in the case of the hook-and-loop fasteners B and C, hook-shaped engaging elements are arranged instead of the column-shaped engaging elements.
When it is desired to open the packaging container 101, take out a portion of the contents, and store the remainder, 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 or the columnar engaging element 182 on the other side, and the engaging elements come into contact with each other, thereby fitting together and engaging detachably, and the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B are joined with an appropriate strength. Moreover, by peeling the hook-and-loop fastener tape 180A from the hook-and-loop fastener tape 180B from each other, the joining between the two can be easily released, and the container can be reopened.
In a conventional resealable packaging container 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, in the packaging container 101 of the present embodiment, the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B are used, both of which have the same shape and are not differentiated between male and female, so the resealing operation can be performed easily and reliably.
In addition, by using the hook-and-loop fastener tapes 180A and 180B of the above-mentioned material and dimensions, it is possible to provide a packaging container that is easy to hold open and has a resealing function that allows easy removal. This point will be described after the other embodiments are described.

(Second embodiment: stand pouch)
FIG. 18 is a plan view of a packaging container 101B of the second embodiment.
FIG. 19 is a cross-sectional view of the packaging container 101B taken along the position of the arrow DD in FIG.
The second embodiment has a similar configuration to the first embodiment, except that a gusset fold-in portion is provided on the bottom portion 132. Therefore, the same reference numerals are used for parts that perform the same functions as those in the first embodiment described above, and duplicated descriptions will be omitted as appropriate.

As shown in Figures 18 and 19, the container body 106 of the packaging container 101B is a bag-shaped container in the form of a self-supporting gusset bag. The laminated film constituting the container body 106 includes a surface film 121 that forms the surface, a back film 122 that forms the back surface, and a bottom film 123 that forms the gusset fold-in portion of the bottom 132. In other words, the container body 106 has a bottom gusset bag shape with a gusset fold-in portion in the bottom 132. From another perspective, the container body 106 has a surface formed by the surface film 121, a back surface formed by the back film 122, and a bottom surface formed by the gusset fold-in portion of the bottom 132.

The gusset fold is provided at the bottom 132 of the container body 106. The gusset fold can be sufficiently expanded so that the container body 106 can stand on its own. The bottom film 123 forming the gusset fold can be folded back to form a fold back portion 135 at the top. This reduces the overall thickness of the container body 106.

The packaging container 101B of the second embodiment is equipped with a hook-and-loop fastener portion 180, similar to the packaging container 101 of the first embodiment, and therefore can provide a packaging container that is easy to keep open and has a resealing function that allows for easy removal.

(Third embodiment: box pouch)
FIG. 20 is a plan view of a packaging container 101C of the third embodiment.
FIG. 21 is a cross-sectional view of the packaging container 101C taken along the position of the arrow EE in FIG.
The third embodiment has a similar configuration to the second embodiment, except that the side portion 133 is also provided with a gusset fold-in portion. Therefore, the same reference numerals are used for parts that perform the same functions as those in the second embodiment described above, and duplicated explanations will be omitted as appropriate.

As shown in Figures 20 and 21, the container body 106 of the packaging container 101C is self-supporting and has a cassette fold-in portion on the side 133, making it a so-called box pouch (registered trademark). In addition to the bottom film 123 that forms the gusset fold-in portion of the bottom 132, the container body 106 also has side films 124 and 125.

The gusset folds are provided on the bottom 132 and also on the side 133 of the container body 106. These gusset folds can be sufficiently widened so that the container body 106 can stand on its own and most of the container can be configured to have a shape close to a rectangular box. The side films 124, 125 that form the gusset folds on the side 133 can be folded back so that folds 136, 137 are formed on the inside. This reduces the overall thickness of the container body 106.

The packaging container 101C of the third embodiment, like the packaging container 101B of the second embodiment, is equipped with a hook-and-loop fastener portion 180, making it possible to provide a packaging container that is easy to hold when opened and has a resealing function that allows for easy removal.

(Fourth embodiment: box-shaped pouch)
FIG. 22 is a plan view of a packaging container 101D of the fourth embodiment.
FIG. 23 is a cross-sectional view of the packaging container 101D taken along the arrow FF in FIG.
FIG. 24 is a perspective view showing a packaging container 101D of the fourth embodiment in an unopened state.
The fourth embodiment has the same configuration as the first embodiment, except that the lower and upper parts are formed flat by providing a folding crease. Therefore, parts that perform the same functions as the first embodiment described above are given the same reference numerals, and duplicated explanations will be omitted as appropriate.

The packaging container 101D of the fourth embodiment is configured in a bag shape, and is configured in a box shape by forming flat lower and upper parts by providing folds at the folding lines OL1 to OL10 in FIG. 22. When the lower and upper parts are formed flat in this way, the excess parts protrude to the left and right from both sides of the flat lower and upper parts. Here, these protruding parts are called triangular ears. In FIG. 24, a triangular ear 150 generated on the upper part is shown. Note that a triangular ear also occurs on the lower part, but in the example shown in FIG. 24, the triangular ear on the lower part is not visible because it is folded along the bottom surface. In the unopened state shown in FIG. 24, the triangular ear is attached to the side by an adhesive with a weak bonding strength, and is located along the side as shown in FIG. 24. The packaging container 101D can be configured by a laminated film (packaging material) having a configuration similar to that of the first embodiment.

FIG. 25 is a diagram showing the packaging container 101D in an opened state.
The packaging container 101D can be opened by peeling off the triangular tab 150 from the side and unfolding the top surface upward. The container can be opened by cutting the upper sealed portion using the notch 107. Figure 25 shows the state after the upper sealed portion has been cut.
The packaging container 101D is provided with hook-and-loop tapes 180A and 180B at the upper end. The hook-and-loop tapes 180A and 180B are configured to be easily opened and closed by hand, as in the other embodiments. Therefore, in this embodiment, the hook-and-loop tapes 180A and 180B enable resealing, and it is possible to provide a packaging container that is easy to hold open and has a resealing function that allows easy removal, as in the packaging container 101 of the first embodiment.

(Regarding loop stiffness of the hook-and-loop fastener portion 180)
In the configurations of the above-mentioned embodiments, the packaging container is made resealable by providing a hook-and-loop fastener portion 180. The hook-and-loop fastener tapes 180A and 180B used in the above-mentioned embodiments are resin molded products, and therefore unless they are appropriately configured, they may easily return to their original shape even after opening due to their high rigidity, resulting in poor ease of removal.
Therefore, the hook-and-loop fastener tapes 180A and 180B used in the packaging containers 101, 101B, 101C and 101D of the present invention are configured so that their bending rigidity (flexibility) is appropriately weak by setting the loop stiffness to an appropriate value.

Loop stiffness is a parameter that indicates the stiffness of a film such as a stretched plastic film. Below, a method for measuring loop stiffness will be explained with reference to Figures 26 to 31. Note that the measurement method explained below will be used to measure the hook-and-loop fastener tapes 180A and 180B of the present invention.

26 is a plan view showing the test piece 80 and the loop stiffness measuring instrument 85, and FIG. 27 is a cross-sectional view of the test piece 80 and the loop stiffness measuring instrument 85 of FIG. 26 along the line G-G. The test piece 80 is a rectangular hook-and-loop fastener tape 180A, 180B having a long side and a short side. In this 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 180A, 180B (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.

The loop stiffness measuring device 85 has a pair of chucks 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 chucks 86. The chucks 86 include a first chuck 861 and a second chuck 862. In the state shown in Figs. 26 and 27, 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 described later, during measurement, the test piece 80 is gripped between the first chuck 861 and the second chuck 862 of the chucks 86. The second chuck 862 may be connected to the first chuck 861 via a hinge mechanism.

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. 26 and FIG. 27, 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 this 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 engagement element is provided) and the outer surface side of the hook-and-loop fastener tapes 180A and 180B. 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. Next, as shown in FIG. 28, the second chuck 862 is placed on top of the test piece 80 so as to grip the end of the long side of the test piece 80 between the first chuck 861 and the second chuck 862.

29, 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 on the test piece 80. The test piece 80 shown in FIG. 29 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. 29, 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 to be formed with a loop length of 60 mm. 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. If the thickness of the test piece 80 is ignored, the above-mentioned distance L3 is the value obtained by adding 2×t to the length of the loop portion 81. t is the thickness of the second chuck 862 of the chuck portion 86.

30, 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. 30, the protruding direction Y of the loop portion 81 coincides with the thickness direction of the chuck portion. In addition, a load cell 88 is prepared at a position distance Z1 away 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 at a speed V by the distance Z2 shown in FIG. 30 toward the loop portion 81 of the test piece 80. 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, as shown in FIG. 30 and FIG. 31. In this 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 10 mm. The speed V at which the load cell 88 is moved is set to 3.3 mm/s, and the pressing hold time is set to 3 s.

Next, as shown in FIG. 31, the load cell 88 is moved a distance Z2 toward the chuck portion 86, and in the 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 is stabilized, 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%.

FIG. 32 is a diagram summarizing the results of evaluation of the loop stiffness, take-out property, and opening retention property of the hook-and-loop fastener tape when samples of several types of packaging containers were prepared.
The evaluation shown in FIG. 32 was carried out for eight examples and four comparative examples by combining three types of hook-and-loop fastener tapes with the shapes of the packaging containers according to the first to fourth embodiments.
The loop stiffness was measured for the hook-and-loop fastener tape 180A (or 180B) alone, not for the hook-and-loop fastener tape 180A and the hook-and-loop fastener tape 180B joined together, because the loop stiffness of the hook-and-loop fastener tape alone affects the opening retention when the package is opened.
The hook-and-loop fastener tapes used were three types: hook-and-loop fasteners A, B, and C. In each example, the hook-and-loop fastener A had a width of 9.5 mm in the TD direction, and the hook-and-loop fasteners B and C had a width of 13 mm in the TD direction.

Additionally, the ease of removal and opening retention (size of opening) were evaluated as to how easily the hand could reach into the container. The evaluation was on a 5-point scale, with 5 being the best rating and the closer to 1 the less favorable the rating (good: 5>4>3>2>1: unfavorable). In this evaluation, a rating of 3 or higher was deemed to be sufficient for ease of removal and opening retention.

Example 1
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 attached with hook-and-loop fastener A and made into a four-sided pouch of the first embodiment to produce Example 1.
The loop stiffness was 87 mN, the loop stiffness (unit width) was 9.2 mN/mm width, and the evaluation results for ease of removal and opening retention were 4.

Example 2
A laminate of 12 μm thick PET, 12 μm thick aluminum-vapor-deposited PET, and 60 μm thick LLDPE was extruded and laminated with 15 μm thick PE, and a hook-and-loop fastener A was attached to form a stand-up pouch of the second embodiment to produce Example 2.
The loop stiffness was 87 mN, the loop stiffness (unit width) was 9.2 mN/mm width, and the evaluation results for ease of removal and opening retention were 4.

Example 3
Example 3 was produced by laminating paper (50 g/m ² ) with aluminum-deposited CPP having a thickness of 30 μm using an adhesive to form a laminate, which was then attached with hook-and-loop fastener A to form a box pouch according to the third embodiment.
The loop stiffness was 87 mN, the loop stiffness (unit width) was 9.2 mN/mm width, and the evaluation results for take-out property and opening retention were 5.

<Example 4>: Box-shaped pouch (specifications: OP, printing/paper/EMAA thickness 15 μm/IB-PET-UBP thickness 12 μm/LDPE thickness 30 μm)
Example 4 was produced by sandwich-laminating paper (150 g/ ^m2 ) with EMAA 15 μm thick and a transparent barrier film 12 μm thick, and extrusion-coating LDPE 30 μm thick. The laminate was then attached with hook-and-loop fastener A all around to produce a box-shaped pouch of the fourth embodiment.
The loop stiffness was 87 mN, the loop stiffness (unit width) was 9.2 mN/mm width, and the evaluation results for take-out property and opening retention were 5.

Example 5
Example 5 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, and attaching hook-and-loop fastener B to form a four-sided pouch as in the first embodiment.
The loop stiffness was 1,320 mN, the loop stiffness (unit width) was 101.5 mN/mm width, and the evaluation results for take-out property and opening retention were 3.

Example 6
Example 6 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, and attaching a hook-and-loop fastener B to produce the stand-up pouch of the second embodiment.
The loop stiffness was 1,320 mN, the loop stiffness (unit width) was 101.5 mN/mm width, and the evaluation results for take-out property and opening retention were 3.

Example 7
Example 7 was produced by laminating paper (50 g/m ² ) with aluminum-deposited CPP having a thickness of 30 μm using an adhesive to form a laminate, which was then attached with hook-and-loop fastener B to form a box pouch of the third embodiment.
The loop stiffness was 1,320 mN, the loop stiffness (unit width) was 101.5 mN/mm width, and the evaluation results for take-out property and opening retention were 4.

Example 8
Paper zip pouch (Specifications: OP, printing/paper/EMAA thickness 15 μm/IB-PET-UBP thickness 12 μm/LDPE thickness 30 μm)
Example 8 was produced by sandwich-laminating paper (150 g/ ^m2 ) with EMAA 15 μm thick and a transparent barrier film 12 μm thick, and extrusion-coating LDPE 30 μm thick. The laminate was then attached with hook-and-loop fastener B and made into a box-shaped pouch of the fourth embodiment.
The loop stiffness was 1,320 mN, the loop stiffness (unit width) was 101.5 mN/mm width, and the evaluation results for take-out property and opening retention were 4.

<Comparative Example 1>
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 attached with hook-and-loop fastener C and made into a four-sided pouch of the first embodiment to produce Comparative Example 1.
The loop stiffness was 6,054 mN, the loop stiffness (unit width) was 465.7 mN/mm width, and the evaluation results for take-out property and opening retention were 1.

<Comparative Example 2>
A laminate of 12 μm thick PET, 12 μm thick aluminum-vapor-deposited PET, and 60 μm thick LLDPE was extruded and laminated with 15 μm thick PE, and a hook-and-loop fastener C was attached to form a stand-up pouch of the second embodiment to produce Comparative Example 2.
The loop stiffness was 6,054 mN, the loop stiffness (unit width) was 465.7 mN/mm width, and the evaluation results for take-out property and opening retention were 1.

<Comparative Example 3>
Comparative Example 3 was prepared by laminating paper (50 g/m ² ) with aluminum-deposited CPP having a thickness of 30 μm using an adhesive, and forming the laminate into a box pouch of the third embodiment by attaching a hook-and-loop fastener C.
The loop stiffness was 6,054 mN, the loop stiffness (unit width) was 465.7 mN/mm width, and the evaluation results for take-out property and opening retention were 2.

<Comparative Example 4>
Paper zip pouch (Specifications: OP, printing/paper/EMAA thickness 15 μm/IB-PET-UBP thickness 12 μm/LDPE thickness 30 μm)
Comparative Example 4 was produced by sandwich-laminating paper (150 g/ ^m2 ) with EMAA 15 μm thick and a transparent barrier film 12 μm thick, and extrusion-coating LDPE 30 μm thick. The laminate was then attached with hook-and-loop fastener C all around to produce a box-shaped pouch of the fourth embodiment.
The loop stiffness was 6,054 mN, the loop stiffness (unit width) was 465.7 mN/mm width, and the evaluation results for take-out property and opening retention were 2.

From the results in Figure 32, it can be said that the loop stiffness of the hook-and-loop fastener alone, as measured under the measurement conditions shown above (loop length 60 mm, push-in speed 3.3 mm/s, push-in hold time 3 s), is desirably 5000 mN or less, more desirably 3000 mN or less, more desirably 1400 mN or less, and even more desirably 100 mN or less.
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.

The bonding strength when the fastener surfaces of the hook-and-loop fastener tapes 180A and 180B are joined together also has a significant impact on the ease of use when re-opening a resealed packaging container. Therefore, the hook-and-loop fastener tapes 180A and 180B used in the above-mentioned packaging containers 101, 101B, 101C, and 101D of the present invention are configured to have an appropriate bonding strength.

FIG. 33 is a diagram showing a method for measuring the bonding strength of the hook-and-loop fastener tapes 180A and 180B.
The measurement of the bonding strength of the hook-and-loop fastener tapes 180A and 180B is performed by chucking the non-bonded portions of the hook-and-loop fastener tapes 180A and 180B with chucks 91 and 92 of a tensile tester as shown in FIG. 33, and a tensile test is performed to measure the bonding strength in T-shaped peeling. FIG. 33 shows the state when measuring in the TD direction. In the case of FIG. 33, the test piece 90 is set so that the left-right direction in FIG. 33 is the TD direction. The length of the test piece 90 in the TD direction is the width of the hook-and-loop fastener tapes 180A and 180B (for example, 9.5 mm), and the length in the depth direction of the paper in FIG. 33 (MD direction) is 15 mm. If the test piece 90 is set so that the left-right direction in FIG. 33 is 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 tapes 180A and 180B (for example, 9.5 mm). The initial chuck distance was 5 mm when measuring in the TD direction and 30 mm when measuring in the MD direction, and the pulling speed was 50 mm/min.

FIG. 34 shows the results of actual measurements of the bonding strength of the above-mentioned hook-and-loop fastener tape.
FIG. 34 is a diagram showing the results of measuring the bonding 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 value per unit width 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 value per unit width 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.

As shown in Fig. 34, although the bonding strength differs depending on the type of hook-and-loop fastener, any hook-and-loop fastener can be used without problems in terms of openability, and sufficient bonding strength is ensured, so that the bonding is not inadvertently released. Therefore, the bonding strength of the hook-and-loop fastener tape in the TD direction is preferably 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 preferably 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 preferably 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 preferably 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.

(Modifications)
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.

(1) In each 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 multiple types of shapes, and the arrangement and ratio of the hook-shaped engaging elements and the columnar engaging elements can also be changed as appropriate.

(2) In each embodiment, four specific types of packaging container shapes are illustrated, but the hook-and-loop fastener tape of the present invention may be provided on other known packaging containers.

The embodiments and variations can be used in appropriate combinations, but detailed explanations will be omitted. Furthermore, the present invention is not limited to the embodiments described above.

80 Test piece 80x Inner surface 80y Outer surface 81 Loop portion 82 Middle portion 83 Fixing portion 85 Loop stiffness measuring device 86 Chuck portion 87 Support member 88 Load cell 90 Test piece 91 Chuck 92 Chuck 101 Packaging container 101B Packaging container 101C Packaging container 101D Packaging container 102 Storage portion 106 Container body portion 107 Notch 121 Surface film 122 Back film 123 Bottom film 124 Side film 125 Side film 131 Upper portion 132 Bottom portion 133 Side portion 135 Folded portion 136 Folded portion 137 Folded portion 141 Upper seal portion 142 Bottom seal portion 143 Side seal portion 150 Triangular ear piece 160 Laminated film 161 Base material layer 162 Design layer 163 Other layers 164 Sealant layer 165 Joining layer 180 Hook-and-loop fastener portion 180A Hook-and-loop fastener tape 180B Hook-and-loop fastener tape 181 Hook-shaped engaging element 181a Pillar portion 181b Engagement protrusion portion 182 Pillar-shaped engaging element 183 Base portion 861 First chuck 862 Second chuck OP Opening

Claims (4)

A packaging container having at least a first edge and a second edge opposite to the first edge,
A hook-and-loop fastener is provided on both of the opposing inner surfaces at a position near the first edge,
The hook-and-loop fastener has hook-shaped engaging elements on both opposing inner surfaces and is formed from a material containing polyethylene, and the loop stiffness of the hook-and-loop fastener alone is 1,400 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 . The packaging container according to claim 1,
A packaging container that can be joined by folding back the hook-and-loop fastener. The packaging container according to claim 1 or 2 ,
The hook-and-loop fastener further includes a plurality of columnar engaging elements arranged to stand up from the fastener surface;
A packaging container characterized by: In the packaging container according to any one of claims 1 to 3 ,
a storage section having a front film and a back film constituted by a laminated film having at least a base layer and a sealant layer, capable of storing contents;
A seal portion formed around the housing portion;
A sealing portion is provided to be sealed after the contents are accommodated therein;
A packaging container characterized by:

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