Packaging container with chuck and packaged product

Abstract

To provide a packaging container with a chuck and a packaged product which can be stably supplied while reducing an environmental load.SOLUTION: A packaging container with a chuck includes a packaging container obtained by using a front surface member and a rear surface member facing each other, and a chuck mechanism provided between the front surface member and the rear surface member, wherein the chuck mechanism includes a female engaging member and a male engaging member, and the front surface member and the rear surface member include a laminate for a packaging material including at least a base material and a seal layer. In the packaging container with the chuck, the chuck mechanism is formed of a resin molded body containing a first recycled resin, the laminate for the packaging material contains a second recycled resin, the first recycled resin and the second recycled resin are different from each other, and the ratio of the recycled resin in the packaging container with the chuck is 10% or more.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to resealable packaging containers and packaging products. [Background technology]

[0002] Packaging materials used in packaging containers such as packaging bags are required to have various properties depending on their applications. Therefore, in order to simultaneously satisfy these various performance requirements, packaging materials are generally composed of a laminate including an outer layer substrate and a sealant layer.

[0003] In recent years, there has been a demand for the use of recycled materials in order to reduce waste and the burden on the environment through the effective use of resources, and packaging materials that contain recycled resins as part of the laminate have come into use.

[0004] As a laminate used in such packaging materials, a known conventional packaging container is, for example, a laminated film that has at least a recycled polyethylene layer and a linear low-density polyethylene layer in this order, in which the recycled polyethylene layer contains 20% by mass or more of recycled polyethylene relative to the total amount constituting the recycled polyethylene layer (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-040660 Summary of the Invention [Problem to be solved by the invention]

[0006] The packaging container described in Patent Document 1 above does not have a zipper mechanism consisting of a female fitting member and a male fitting member attached, but if a zipper is attached to the packaging container to make it a packaging container with a zipper, it is possible to use recycled materials for the zipper mechanism in order to increase the usage rate of recycled materials.

[0007] However, if the recycled material is the same type as the recycled material used in the packaging material, it becomes necessary to secure a large amount of that single type of recycled material, which may not be possible to stably secure such recycled material on the market, making it difficult to stably supply the resealable packaging containers.

[0008] An object of the present disclosure is to provide a packaging container with a zipper and a packaging product that can be supplied stably while reducing the environmental impact. [Means for solving the problem]

[0009] In one aspect, the present disclosure provides a resealable packaging container comprising: "[1] a packaging container obtained by using a surface member and a back member facing each other; and a zip mechanism provided between the surface member and the back member, the zip mechanism being composed of a female fitting member and a male fitting member, the surface member and the back member being composed of a packaging laminate comprising at least a base material and a seal layer, the zip mechanism being composed of a resin molded body containing a first recycled resin, the packaging laminate containing a second recycled resin, the first recycled resin and the second recycled resin being different types, and the proportion of recycled resin in the resealable packaging container being 10% or more." Here, the proportion of recycled resin in the resealable packaging container may be expressed in units of "volume %" or "mass %."

[0010] According to the above-mentioned resealable packaging container, the first recycled resin contained in the resin molded body constituting the chuck mechanism and the second recycled resin contained in the packaging laminate are different types. Therefore, when the proportion of recycled resin in the resealable packaging container is 10% or more and constant, it is possible to reduce the amount of recycled resin required per type compared to when the first recycled resin and the second recycled resin are the same type, or when recycled resin is contained only in either the chuck mechanism or the packaging laminate. This makes it easier to stably secure recycled resins for each type. Furthermore, according to the above-mentioned resealable packaging container, recycled resin is contained not only in the chuck mechanism but also in the packaging container. Therefore, the resealable packaging container enables a stable supply while reducing the environmental impact.

[0011] In another aspect, the present disclosure provides "the resealable packaging container according to [1], wherein [2] the first recycled resin includes a chemically recycled resin."

[0012] The zipper mechanism is made of a resin molded body containing a first recycled resin, and the first recycled resin includes a chemically recycled resin. Chemically recycled resin is a recycled resin produced by first depolymerizing the resin through a process appropriate for the material's characteristics, such as monomerization via oil-refined naphtha or depolymerization, followed by polymerization. Therefore, chemically recycled resin is less likely to be contaminated with foreign matter such as impurities, gels, and aggregates than material recycled resin, which is a resin made by cleaning, crushing, and then heating and melting resin products such as recovered used packaging materials to recycle them into raw materials. Therefore, the appearance of foreign matter such as gels and aggregates on the surface of the zipper mechanism is reduced. Furthermore, because the recycled resin is chemically recycled resin, the zipper mechanism is less likely to turn dark, such as yellowing. Therefore, the appearance of a zipper-type packaging container can be improved even if the zipper mechanism contains recycled resin. Furthermore, unlike material-recycled resins, chemically recycled resins are not subject to heat treatments such as melting after the recycling process, making them less susceptible to thermal degradation and less likely to emit odorous components. Furthermore, because the chuck mechanism is made of a resin molded body containing a first recycled resin, and the first recycled resin is a chemically recycled resin, no foreign matter originating from the recycled material is introduced during molding of the chuck mechanism, preventing the kneading ability of the injection screw from being impaired, and reducing the buildup of carbonized material within the chuck mechanism. Furthermore, when the chuck mechanism is composed of a cap and a main body, unmelted material is prevented from being present in the fitting portions of the cap and main body that constitute the chuck mechanism, preventing poor fitting and reducing leakage from the chuck mechanism. Furthermore, no foreign matter originating from the recycled material is introduced during molding of the chuck mechanism, preventing large sink marks originating from the core of the foreign matter during injection molding of the chuck mechanism and preventing the chuck mechanism from being impeded by welding. Therefore, the quality of a chuck-equipped packaging container can be improved even if the chuck mechanism contains a first recycled resin.

[0013] In another aspect, the present disclosure provides "a resealable packaging container according to [1], wherein the first recycled resin contains a material recycled resin."

[0014] When contents are placed in a resealable packaging container, the contents rarely come into contact with the resealable mechanism, and even if they do, it is only for a very short time. Therefore, even if the first recycled resin contains material recycled resin, foreign matter originating from the material recycled resin is prevented from being mixed into the contents. Furthermore, if the first recycled resin contains material recycled resin, costs and energy consumption in the recycling process can be reduced.

[0015] In another aspect, the present disclosure provides "a resealable packaging container according to any one of [1] to [3], wherein the second recycled resin contains material-recycled polyethylene terephthalate."

[0016] Currently, collection and recycling schemes for material recycled polyethylene terephthalate have been established, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of packaging laminates will be possible. In addition, because the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate.

[0017] In another aspect, the present disclosure provides "a packaging container with a zipper according to any one of [5] to [3], wherein the second recycled resin includes a chemical recycled resin."

[0018] When contents are placed in a resealable packaging container, the contents come into contact with the container for a long period of time. When the second recycled resin contains chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, so that foreign matter originating from the material recycled resin is prevented from being mixed into the contents.

[0019] In another aspect, the present disclosure provides a resealable packaging container according to any one of [1] to [5], wherein the proportion of the first recycled resin in the resealable packaging container is 10 to 90% and the proportion of the second recycled resin is 90 to 10%.

[0020] According to this resealable packaging container, recycled resin is dispersed in a balanced manner in the resealable mechanism and the packaging container, making it possible to more stably supply resealable packaging containers.

[0021] As another aspect, the present disclosure provides, "a resealable packaging container according to any one of [7] to [6], wherein the proportion of the second recycled resin in the recycled resin contained in the resealable packaging container is smaller than the proportion of the first recycled resin."

[0022] When contents are placed in a resealable packaging container, the contents are in contact with the packaging container for a longer period of time than with the zipper mechanism. Therefore, if the proportion of the second recycled resin contained in the packaging container is lower than the proportion of the first recycled resin contained in the zipper mechanism, the proportion of recycled resin in the resealable packaging container can be increased while further preventing foreign matter originating from the recycled resin from being mixed into the contents.

[0023] In another aspect, the present disclosure provides "a resealable packaging container according to claim 1, wherein the packaging laminate further comprises a gas barrier layer between the substrate and the sealing layer."

[0024] In this case, the gas barrier properties of the laminate for packaging material are further improved, and therefore, even when contents are placed in a resealable packaging container obtained by attaching a resealing mechanism to a packaging container obtained using the laminate for packaging material, deterioration of the contents due to gases such as oxygen can be effectively suppressed.

[0025] In another aspect, the present disclosure provides a packaging product comprising a resealable packaging container according to any one of [9] [1] to [8] and contents contained in the resealable packaging container.

[0026] The packaging product includes a packaging container with a zipper, and the packaging container with a zipper enables a stable supply while reducing the environmental impact. Therefore, the packaging product enables a stable supply while reducing the environmental impact. [Effects of the Invention]

[0027] According to the present disclosure, a resealable packaging container and a packaged product are provided that can be supplied stably while reducing the environmental burden. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a front view showing one embodiment of a packaging product of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view showing an example of a packaging laminate constituting the front and back members of the packaged product of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029]

[0023] Hereinafter, an embodiment of the packaging product of the present disclosure will be described in detail. In the drawings, the same or corresponding parts are designated by the same reference numerals, and duplicated explanations will be omitted. Fig. 1 is a front view showing one embodiment of a packaging laminate according to one aspect of the present disclosure, Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, and Fig. 3 is a cross-sectional view showing an example of a packaging laminate constituting the front and back members of the packaging product of the present disclosure.

[0030] The packaged product 500 shown in FIG. 1 includes a resealable packaging container 400 and a content C contained in the resealable packaging container 400. The zippered packaging container 400 comprises a packaging container 300 obtained by using a surface member 100A and a back member 100B facing each other, and a zipper mechanism 310 provided between the surface member 100A and the back member 100B, and the zipper mechanism 310 consists of a female fitting member 311 and a male fitting member 312, as shown in FIG. 2. The chuck mechanism 310 is made of a resin molded body containing a first recycled resin. The packaging container 300 is obtained using a front surface member 100A and a back surface member 100B that face each other. The front surface member 100A and the back surface member 100B are composed of a laminate for packaging material (hereinafter also referred to as a "laminate") 100. The laminate 100 contains a second recycled resin, and the first recycled resin and the second recycled resin are different types. The proportion A of recycled resin in the resealable packaging container 400 is 10% or more. Here, the recycled resin is composed of the first recycled resin and the second recycled resin. As shown in FIGS. 2 and 3, the laminate 100 includes a substrate 10 and a seal layer 30. The laminate 100 may further include a second substrate 20 between the substrate 10 and the seal layer 30 . The laminate 100 may further include a gas barrier layer 60 as shown in FIG. The laminate 100 may further include a printed layer 50 as shown in FIG.

[0031] The packaged product 500 includes a resealable packaging container 400. In the resealable packaging container 400, the first recycled resin contained in the resin molded body constituting the chuck mechanism 310 and the second recycled resin contained in the laminate 100 are different types. Therefore, when the percentage A of recycled resin in the resealable packaging container 400 is 10% or more and constant, the amount of recycled resin required per type can be reduced compared to when the first recycled resin and the second recycled resin are the same type or when recycled resin is contained in only one of the chuck mechanism 310 or the laminate 100. This makes it easier to stably secure recycled resins for each type. Furthermore, according to the resealable packaging container 400, recycled resin is contained not only in the chuck mechanism 310 but also in the packaging container 300. Therefore, the resealable packaging container 400 enables a stable supply while reducing the environmental impact.

[0032] The unit of the proportion A of recycled resin in the resealable packaging container 400 may be "volume %" or "mass %". In addition, if the chuck mechanism 310, substrate 10, second substrate 20 or sealing layer 30 containing recycled resin is a mixture of recycled resin and non-recycled resin, the mass or volume of the recycled resin in each of the chuck mechanism 310, substrate 10, second substrate 20 or sealing layer 30 is calculated according to the proportion of recycled resin in each of the chuck mechanism 310, substrate 10, second substrate 20 or sealing layer 30, and the proportion A (%) of recycled resin in the zipper-equipped packaging container 400 is calculated.

[0033] From the viewpoint of further reducing the environmental load, A is preferably 20% or more, more preferably 25% or more, even more preferably 30% or more, and particularly preferably 40% or more. A may be 100%, but from the viewpoint of stable supply of the resealable packaging container 400, it is preferably 90% or less, more preferably 80% or less, even more preferably 70% or less, and particularly preferably 60% or less.

[0034] Among all the recycled resins in the resealable packaging container 400, the proportion A1 of the first recycled resin and the proportion A2 of the second recycled resin are not particularly limited, but it is preferable that the proportion A1 of the first recycled resin is 10 to 90% and the proportion A2 of the second recycled resin is 90 to 10%. According to this packaging container 400 with a zipper, the recycled resin is dispersed in a balanced manner in the zipper mechanism 310 and the packaging container 300, so that the packaging container 400 with a zipper can be supplied more stably. Here, A1 is preferably 20 to 80%, more preferably 30 to 70%, and particularly preferably 40 to 60%. A2 is calculated using the following formula: A2=100-A1

[0035] In the recycled resin contained in the resealable packaging container 400, the proportion A2 of the second recycled resin may be smaller than the proportion A1 of the first recycled resin or may be equal to or larger than A1, but is preferably smaller than A1. When content C is placed in resealable packaging container 400, content C is in contact with packaging container 300 for a longer period of time than with chuck mechanism 310. For this reason, among the recycled resins contained in resealable packaging container 400, if the proportion A2 of the second recycled resin contained in packaging container 300 is less than the proportion A1 of the first recycled resin contained in chuck mechanism 310, the proportion A of recycled resin in resealable packaging container 400 can be increased while further suppressing the incorporation of foreign matter originating from the recycled resin into content C. Furthermore, when chuck mechanism 310 is formed by injection molding and laminate 100 is formed by film formation, replacing non-recycled resin with recycled resin becomes easier when the proportion A1 of the first recycled resin is greater than the proportion A2 of the second recycled resin.

[0036] Here, A1-A2 should be greater than 0%, but is preferably 5% or greater, more preferably 10% or greater, and particularly preferably 20% or greater.

[0037] The recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but preferably contains PCR. PCR can be secured in large quantities on the market, so if the recycled resin is PCR, it becomes possible to more stably supply the resealable packaging container 400.

[0038] The packaging container 300, the zipper mechanism 310, and the contents C will be described in detail below.

[0039] <<Packaging container>> The packaging container 300 is obtained, for example, by using a laminate 100 that constitutes a front surface member 100A and a back surface member 100B that face each other. Specifically, the packaging container 300 can also be obtained, for example, by folding one laminate 100 and heat-sealing the overlapping peripheral portions. In this case, the packaging container 300 is composed of the front surface member 100A and the back surface member 100B that face each other and a connecting portion that connects them.

[0040] The packaging container 300 can be obtained, for example, by overlapping two laminates 100 and heat-sealing the overlapping peripheral edges. Alternatively, the packaging container 300 may be a gusset pouch. In this case, the packaging container 300 can be obtained by using two of the four laminates 100 as side surface laminates and the remaining two laminates 100 as the front surface member 100A and the back surface member 100B, folding the two side surface laminates with the seal layer 30 facing outward, inserting these two side surface laminates between the front surface member 100A and the back surface member 100B, and heat-sealing the overlapping peripheral edges.

[0041] The laminate 100 includes a second recycled resin. The second recycled resin may be contained in at least one of the substrate 10, the seal layer 30, and the second substrate 20, or may be contained in all of the substrate 10, the seal layer 30, and the second substrate 20, or may be contained only in the substrate 10 and the second substrate 20, or may be contained only in the substrate 10 and the seal layer 30, or may be contained only in the seal layer 30 and the second substrate 20. The second recycled resin may be contained in any one of the substrate 10, the seal layer 30, and the second substrate 20.

[0042] <Base material> A substrate film containing a resin material can be used as the substrate 10. Examples of such resin materials include polyester resin, polyolefin resin, polystyrene, polyamide resin such as nylon 66, polycarbonate resin, polyacrylonitrile resin, polyimide resin, and other engineering plastics. The resin material is preferably one that has mechanical strength and dimensional stability.

[0043] Examples of polyolefin resins include polyethylene and polypropylene. Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene with other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, and acrylic esters. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more.

[0044] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0045] Polyester resins are useful for ensuring the mechanical strength of the substrate 10. Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. From the viewpoint of availability, polyethylene terephthalate is preferred. Examples of polyamide resins include nylon 6, nylon 6,6, a copolymer of nylon 6 and nylon 6,6, nylon 9T, nylon 10, polymetaxylylene adipamide (MXD6), nylon 11, nylon 12, and the like.

[0046] The resin material may be a non-recycled resin (petroleum-derived), a recycled resin (second recycled resin), or a mixture thereof. When the resin material contains a recycled resin (second recycled resin), the type of this recycled resin is different from the type of the first recycled resin in the chuck mechanism 310. When the resin material contains a recycled resin (second recycled resin) and at least one of the sealing layer 30 and the second substrate 20 also contains a recycled resin (second recycled resin), the type of recycled resin in the substrate 10 may be the same as or different from the type of recycled resin in at least one of the sealing layer 30 and the second substrate 20, but from the perspective of a stable supply of the resealable packaging container 400, it is preferable that they be different.

[0047] When the resin material contains a recycled resin (second recycled resin), the recycled resin may be either a material recycled resin or a chemical recycled resin, but it is preferable to use a chemical recycled resin. When the contents C are placed in the resealable packaging container 400, the contents C are in contact with the packaging container 300 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the incorporation of foreign matter into the contents C is suppressed.

[0048] The recycled resin may include a material recycled resin, but the material recycled resin is preferably material recycled polyethylene terephthalate. Currently, collection and recycling schemes have been established for material recycled polyethylene terephthalate, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of laminate 100 becomes possible. Furthermore, since the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate.

[0049] Furthermore, the substrate 10 may be composed of a single layer or a laminate of multiple layers. When the substrate 10 is composed of a laminate of multiple layers, the substrate 10 may be formed from a layer structure of two or more layers. When the resin material contains a recycled resin (second recycled resin), it is sufficient that the recycled resin is contained in at least one of the layers.

[0050] Furthermore, the substrate 10 may be a layer obtained by co-extrusion forming a multilayer film of an ethylene-vinyl alcohol copolymer layer or a polyamide layer, if necessary, using an adhesive resin, etc., and then stretching the formed film. Examples of such multilayer substrates include a three-kind five-layer substrate consisting of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / recycled resin, and a three-kind three-layer substrate consisting of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer. In a multi-layer substrate, the same type of material may have different specific gravities depending on the function.

[0051] The substrate 10 may further contain additives such as fillers, antistatic agents, plasticizers, lubricants, light-shielding pigments, and antioxidants, as needed. When the substrate 10 contains a light-shielding pigment, the substrate 10 can function as a light-shielding layer.

[0052] The substrate 10 may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. The substrate 10 may be composed of either a stretched film or an unstretched film. When the substrate 10 is a uniaxially stretched film, the laminate 100 can have improved tear resistance, heat resistance, and the like. When the substrate 10 is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 100 can be improved.

[0053] When an adhesive layer is provided on the surface of the substrate 10 on the side of the sealing layer 30, various pretreatments such as corona treatment, plasma treatment, ozone treatment, and flame treatment may be performed on the surface on the side of the adhesive layer in order to enhance adhesion to the adhesive layer, or a coating layer such as an easy-adhesion layer may be provided.

[0054] The thickness of the substrate 10 is not particularly limited and is, for example, 10 μm or more and 100 μm or less. From the viewpoint of reducing materials to reduce environmental impact and from the viewpoint of obtaining excellent heat resistance, impact resistance, and gas barrier properties, the thickness of the substrate 10 may be 12 μm or more, 20 μm or more, 25 μm or more, 30 μm or more, or 40 μm or more. The thickness of the substrate 10 may also be 60 μm or less, or 50 μm or less.

[0055] <Sealing layer> The sealing layer 30 is bonded to the sealing layer 30 of another packaging laminate 100 by heating and pressurizing when manufacturing a packaging container 300 using the laminate 100, and the sealing layer 30 can be a sealant film containing a resin material or a heat seal varnish layer. Examples of the resin material include polyester resin, polyolefin resin, etc. Among these, polyolefin resin is preferred from the viewpoint of improving heat sealability, and polyethylene is preferred from the viewpoint of further improving heat sealability.

[0056] Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene with other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, and acrylic esters. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more.

[0057] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0058] Polyester resins are useful for ensuring the mechanical strength of the sealant layer 30. Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. From the viewpoint of availability, polyethylene terephthalate is preferred.

[0059] The resin material may be a non-recycled resin (petroleum-derived), a recycled resin (second recycled resin), or a mixture thereof. When the resin material contains a recycled resin (second recycled resin), the type of this recycled resin is different from the type of the first recycled resin in the chuck mechanism 310. When the resin material contains a recycled resin (second recycled resin) and at least one of the substrate 10 and the second substrate 20 also contains a recycled resin (second recycled resin), the type of recycled resin in the seal layer 30 may be the same as or different from the type of recycled resin in at least one of the substrate 10 and the second substrate 20, but from the perspective of a stable supply of the resealable packaging container 400, it is preferable that they be different.

[0060] When the resin material contains a recycled resin (second recycled resin), the recycled resin may be either a material recycled resin or a chemical recycled resin, but a chemical recycled resin is preferred. When the contents C are placed in the resealable packaging container 400, the contents C come into contact with the packaging container 300 for a long period of time. In particular, the sealant layer 30 comes into direct contact with the contents C. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the incorporation of foreign matter into the contents C is suppressed. The recycled resin may include a material recycled resin, but the material recycled resin may be material recycled polyethylene terephthalate.

[0061] The recycled resin may include a material recycled resin, but the material recycled resin may be material recycled polyethylene terephthalate. Currently, collection and recycling schemes for material recycled polyethylene terephthalate have been established, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of the packaging laminate 100 becomes possible. Furthermore, since the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate.

[0062] The sealing layer 30 preferably has a melting point lower than that of the substrate 10 disposed on the outside. In this case, when the laminate 100 is heat-sealed, it is possible to heat-seal the sealing layer 30 while suppressing melting of the substrate 10. Furthermore, by heating the laminate 100, the substrate 10 and the sealing layer 30 can be easily separated, and material recycling of each of the substrate 10 and the sealing layer 30 can be easily performed.

[0063] The sealing layer 30 may further contain additives such as a flame retardant, a slip agent, an antiblocking agent, an antioxidant, a light stabilizer, a tackifier, an antistatic agent, and a light-shielding pigment, as required. When the sealing layer 30 contains a light-blocking pigment, the sealing layer 30 can function as a light-blocking layer.

[0064] The sealing layer 30 may be composed of a single layer or a laminate of multiple layers. When the plurality of layers is, for example, three layers, the laminate of the plurality of layers may be composed of a first outer layer, an intermediate layer, and a second outer layer. Here, the first outer layer and the second outer layer may comprise a non-recycled resin film, and the intermediate layer may comprise a recycled resin. The sealing layer may also be colored white or the like. For example, a white sealant containing a titanium oxide-based white pigment can be used. Note that the sealing layer 30 is not limited to a white sealant, and may be formed of a sealing layer of a different color by containing a pigment other than the white pigment.

[0065] (sealant film) The sealant film may be a polyolefin resin film or a polyester resin film. The polyolefin resin film is suitable for use in terms of sealing suitability and includes a resin material made of polyolefin resin. The polyolefin resin may be the same as the resin material used for the substrate 10. The polyester resin film may be a copolymer polyester obtained by copolymerizing various copolymers, and such a sealant is preferred in terms of low adsorption of content components and flavor barrier properties.

[0066] The thickness of the sealant film is not particularly limited and is adjusted appropriately depending on the application of the laminate 100. The thickness of the sealant film may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the sealant film may also be 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0067] (heat seal varnish layer) The heat seal varnish layer can be used in laminates for lightweight packaging, primarily containing lightweight snacks. The heat seal varnish layer is obtained by applying and drying an acrylic heat seal varnish, an elastomer heat seal varnish, or an olefin heat seal varnish. Examples of heat seal varnishes that can be used include heat seal varnishes in which heat seal varnish components are dispersed in an aqueous solvent (e.g., water). Examples of heat seal varnishes that can be used include acrylic resin emulsions in which acrylic resins are dispersed in aqueous solvents as heat seal varnish components, styrene-acrylic emulsions in which styrene-acrylic copolymer resins are dispersed in aqueous solvents as heat seal varnish components, ionomer emulsions in which ionomers are dispersed in aqueous solvents as heat seal varnish components, and polyolefin emulsions in which polyolefin resins are dispersed in aqueous solvents as heat seal varnish components. In particular, it is preferable to use an aqueous heat seal varnish prepared by dispersing an aqueous polyolefin resin having at least one selected from the group consisting of a carboxyl group, a salt of a carboxyl group, a carboxylic anhydride group, and a carboxylic acid ester in an aqueous solvent as a heat seal varnish component, among polyolefin emulsions. The thickness of the heat seal varnish layer may be, for example, 0.05 μm or more, 0.5 μm or more, or 1 μm or more, and may be 20 μm or less, 10 μm or less, or 5 μm or less. The thickness of the heat seal varnish layer is preferably 1 to 5 μm. In this case, sufficient heat seal strength can be obtained while also providing resistance to bending.

[0068] <Second base material> The second substrate 20 is a substrate that reinforces the substrate 10, and can further improve the strength of the laminate 100. The second substrate 20 may be provided on the seal layer 30 side of the substrate 10 (between the substrate 10 and the seal layer 30), or may be provided on the outer side of the substrate 10 (on the opposite side of the substrate 10 from the seal layer 30). The second substrate 20 may also be provided on both sides of the substrate 10 (inside and outside). The second base material 20 can be a base material film containing a resin material. Examples of such resin materials include engineering plastics such as polyester resin, polyolefin resin, polystyrene resin, polyamide resin, polycarbonate resin, polyacrylonitrile resin, polyimide resin, etc. As the resin material, a resin material having mechanical strength and dimensional stability is preferred.

[0069] Examples of polyolefin resins include polyethylene, polypropylene, and cyclic olefin copolymers. Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene with other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, and acrylic esters. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more.

[0070] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene. Examples of cyclic olefin copolymers include COC and COP.

[0071] Polyester resins are useful for ensuring the mechanical strength of the second base material 20. Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. From the viewpoint of availability, polyethylene terephthalate is preferred. Examples of polyamide resins include nylon 6, nylon 6,6, a copolymer of nylon 6 and nylon 6,6, nylon 9T, nylon 10, polymetaxylylene adipamide (MXD6), nylon 11, nylon 12, and the like.

[0072] The resin material may be a non-recycled resin (petroleum-derived), a recycled resin (second recycled resin), or a mixture thereof. When the resin material contains a recycled resin (second recycled resin), the type of this recycled resin is different from the type of the first recycled resin in the chuck mechanism 310. When the resin material contains a recycled resin (second recycled resin) and at least one of the base layer 10 and the sealant layer 30 also contains a recycled resin (second recycled resin), the type of recycled resin in the base material 10 may be the same as or different from the type of recycled resin in at least one of the base layer 10 and the sealant layer 30, but from the perspective of a stable supply of the packaging container 400 with a chuck mechanism, it is preferable that they be different.

[0073] When the resin material contains a recycled resin (second recycled resin), the recycled resin may be either a material recycled resin or a chemical recycled resin, but chemical recycled resin is preferred. When the contents C are placed in the packaging container 400 with a zipper mechanism, the contents C are in contact with the packaging container 300 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the incorporation of foreign matter into the contents C is suppressed.

[0074] The recycled resin may include a material recycled resin, but the material recycled resin is preferably material recycled polyethylene terephthalate. Currently, collection and recycling schemes have been established for material recycled polyethylene terephthalate, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of laminate 100 becomes possible. Furthermore, since the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate.

[0075] The second substrate 20 may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. The second substrate 20 may be composed of either a stretched film or an unstretched film. When the second substrate 20 is a uniaxially stretched film, the tear resistance and heat resistance of the laminate 100 can be improved. When the second substrate 20 is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 100 can be improved.

[0076] The second substrate 20 may be composed of a single layer or a laminate of multiple layers. When the second substrate 20 is composed of multiple layers, all of the layers may contain recycled resin film (second recycled resin), or may contain non-recycled resin film, or some of the layers may contain non-recycled resin and the rest may contain recycled resin. When the plurality of layers is three layers, the plurality of layers may be composed of a first outer layer, a middle layer, and a second outer layer. Here, the first outer layer and the second outer layer may contain a non-recycled resin, and the intermediate layer may contain a recycled resin. In this case, it is possible to further reduce the possibility that foreign matter such as impurities, gels, and aggregates will migrate from the second substrate 20 through the seal layer 30 to the contents C due to heating during retort or boiling treatment of the resealable packaging container 400. Therefore, the laminate 100 can be used safely to package the contents C, such as food.

[0077] When an adhesive layer is provided on the surface of the second substrate 20, various pretreatments such as corona treatment, plasma treatment, ozone treatment, and flame treatment may be performed on the surface on the adhesive layer side in order to enhance adhesion to the adhesive layer, or a coating layer such as an easy-adhesion layer may be provided.

[0078] The thickness of the second substrate 20 is not particularly limited and is adjusted appropriately depending on the application of the laminate 100. The thickness of the second substrate 20 may be, for example, 10 μm or more, 25 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more. The thickness of the second substrate 20 may also be 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less.

[0079] <Adhesive layer> Examples of the adhesive layer include an adhesive layer formed using an adhesive agent and an adhesive layer containing an adhesive resin (hereinafter also referred to as an "adhesive resin layer").

[0080] Examples of adhesives include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0081] The adhesive may or may not contain a biomass-derived component, but preferably contains a biomass-derived component from the viewpoint of reducing the environmental impact. Specific examples of biomass-derived components include the "DIC Dry BM Series" manufactured by DIC Corporation and the "ECOAD Series" manufactured by Toyo Ink Co., Ltd. The adhesive may be a gas barrier adhesive that exhibits gas barrier properties after curing. By using a gas barrier adhesive, the adhesive layer has gas barrier properties, and therefore the gas barrier properties of the laminate 100 can be improved. Gas barrier adhesives include epoxy adhesives and polyester / polyurethane adhesives. A specific example of a gas barrier adhesive is " Examples include "Maxive" manufactured by DIC Corporation and "Paslim" manufactured by DIC Corporation.

[0082] The adhesive may be an adhesive containing an organic solvent or an adhesive containing no organic solvent, but from the viewpoint of reducing the environmental load, an adhesive containing no organic solvent (solvent-free adhesive) is preferred.

[0083] The adhesive resin layer may be an extruded or non-extruded resin layer. The adhesive resin is a heat-sealable adhesive thermoplastic resin, and any resin can be used as long as it can be melted and fused by heat. For example, resins such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, and acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like can be used.

[0084] The thickness of the adhesive layer is not particularly limited and may be, for example, 1 μm or more. By making the thickness of the adhesive layer 1 μm or more, sufficient adhesive strength can be obtained. The thickness of the adhesive layer may be 2 μm or more. The thickness of the adhesive layer may be 50 μm or less, 5 μm or less, or 3 μm or less.

[0085] <Print layer> The printed layer 50 can be provided on one or both surfaces of the substrate 10 or the second substrate 20. When the printed layer 50 is provided between layers of the laminate 100, the printed layer 50 is protected by the substrate 10 or the second substrate 20, and therefore deterioration of the printed layer 50 can be prevented. When the printed layer 50 is the outermost layer of the laminate 100 on the side opposite the seal layer 30 as shown in FIG. 3, the printed layer 50 can be easily removed when recycling the packaging container 300 including the laminate 100 after disposal.

[0086] The print layer 50 is a layer that displays characters, pictures, etc., and can be formed using ink. As the ink, for example, inks made by adding various pigments, plasticizers, desiccants, stabilizers, etc. to a binder resin such as a urethane-based resin, an acrylic-based resin, a nitrocellulose-based resin, or a rubber-based resin can be used.

[0087] The ink may be either a water-based ink or an oil-based ink, but is preferably a water-based ink. A water-based ink uses water or alcohol as a solvent, which can further reduce the environmental impact. In particular, when the adhesive is a solventless adhesive, using a water-based ink as the ink can significantly reduce the environmental impact. Furthermore, the ink may or may not be a biomass ink, but from the perspective of reducing the environmental impact, a biomass ink is preferred. Here, biomass ink refers to an ink containing components obtained from biological resources (biomass), such as cotton, pulp, rice bran, vegetable oil, and angiosperm seeds. The ink may be recycled ink, which is made by collecting and recycling used ink, or may be non-recycled ink, but recycled ink is preferred from the viewpoint of reducing the environmental load. Furthermore, easily recyclable ink can also be used. By using easily recyclable ink, it becomes possible to easily recycle the resealable packaging container 400 after disposal. Specifically, an example of such ink is "SunSpectro Solvawash" manufactured by DIC Corporation.

[0088] <Gas barrier layer> The gas barrier layer 60 is a layer that improves the gas barrier properties of the laminate 100. Gas barrier properties refer to barrier properties against gases such as water vapor or oxygen. Therefore, even if contents C are stored in a packaging container 400 with a chuck mechanism obtained by attaching a chuck mechanism 310 to a packaging container 300 obtained using the laminate 100, deterioration of the contents C due to gases such as oxygen can be effectively suppressed.

[0089] The gas barrier layer 60 may be provided on the substrate 10 on the side facing the seal layer 30, or on the side of the substrate 10 opposite the seal layer 30, or on both sides of the substrate 10. Furthermore, when the laminate 100 includes a second substrate 20, the gas barrier layer 60 may be provided on the second substrate 20 on the side facing the substrate 10, or on the side of the second substrate 20 facing the seal layer 30, or on both sides of the second substrate 20, as shown in FIG.

[0090] The gas barrier layer 60 may be, for example, a vapor deposition layer such as a metal vapor deposition layer or an inorganic compound vapor deposition layer. Metals include aluminum and silicon. Inorganic compounds include metal oxides such as aluminum oxide and silicon oxide (silica).

[0091] When the gas barrier layer 60 is a vapor-deposited layer of a metal such as aluminum, the gas barrier layer can function as a light-shielding layer.

[0092] The gas barrier layer 60 may further include an anchor coat layer between the substrate 10 and the vapor deposition layer to improve adhesion therebetween. The material constituting the anchor coat layer may include a polyurethane resin. The polyurethane resin is formed by reacting, for example, an organosilane or organometallic compound with a polyol compound and an isocyanate compound.

[0093] The gas barrier layer 60 may further include an overcoat layer on the vapor deposition layer. The overcoat layer may be a coating layer obtained using a composition containing a water-soluble polymer and silicon alkoxide, or a coating layer made of a resin such as polyurethane.

[0094] <Other> The laminate 100 may further include a layer containing a non-polyolefin resin. Examples of non-polyolefin resins include polyamide resins such as nylon, and polyester resins such as polyethylene terephthalate (PET).

[0095] The pair of laminates 100 constituting the resealable packaging container 400 may have the same configuration as each other, or may have different configurations from each other.

[0096] The zippered packaging container 400 may have a half-cut line, and may further have an easy-open part at both ends or one end of the half-cut line. Examples of the easy-open part include a group of scars, and a V-shaped, U-shaped, or I-shaped notch.

[0097] In the adhesive portion of the resealable packaging container 400, the seal layers 30 of the laminate 100 may be directly bonded to each other by heat sealing (see FIG. 2), or may be bonded to each other by an adhesive.

[0098] <<Chuck mechanism>> The chuck mechanism 310 is made up of a female fitting member 311 and a male fitting member 312. The female fitting member 311 and the male fitting member 312 are each made of a resin molded body containing a resin material.

[0099] Such a resin material may be, for example, a polyolefin resin.

[0100] Examples of polyolefin resins include polyethylene and polypropylene, among which polyethylene is preferred from the viewpoint of moldability. Polyethylene is a resin containing ethylene as a structural unit. Examples of polyethylene include ethylene homopolymers and copolymers of ethylene with other monomers. The proportion of ethylene in polyethylene is, for example, 80 mol % or more. Examples of other monomers include α-olefins, vinyl acetate, and acrylic esters. The α-olefin may be an olefin having a carbon number in the range of 3 to 20. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 3-methyl-1-butene, 4-methyl-1-pentene, and 6-methyl-1-heptene. Examples of polyethylene include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), very low-density polyethylene (VLDPE), ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, etc. These may be used alone or in combination of two or more.

[0101] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0102] The resin material includes a first recycled resin, which is a different type of recycled resin from the second recycled resin. The recycled resin (first recycled resin) may be either material recycled resin or chemical recycled resin, since even when contents C are contained in the resealable packaging container 400, the time that contents C come into contact with the chuck mechanism 310 is short. However, the recycled resin is preferably a chemical recycled resin. When the first recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the incorporation of foreign matter into the contents C is suppressed.

[0103] The proportion of recycled resin in the chuck mechanism 310 is not particularly limited as long as it is greater than 0%, but is, for example, 10% or more, 20% or more, or 50% or more. The proportion of recycled resin in the chuck mechanism 310 may also be 100%. The chuck mechanism 310 may be attached at any position between the front surface member 100A and the back surface member 100B in the packaging container 300. However, from the viewpoint of being able to sufficiently accommodate the contents C, the chuck mechanism 310 is preferably disposed near the heat-sealed portion between the front surface member 100A and the back surface member 100B.

[0104] The male fitting member 312 serving as a chuck member constituting the chuck mechanism 310 has, for example, a tape-shaped support portion 312a fixed to the sealing layer 30 of the surface member 100A, and a protrusion 312b provided on the support portion 312a (see FIG. 2). The female fitting member 311 serving as a chuck member constituting the chuck mechanism 310 has, for example, a tape-like support portion 311a fixed to the back surface member 100B, and two protrusions 311b provided on the support portion 311a. The two protrusions 311b form a space that receives and fits the convex portion 312b of the male fitting member 312 (see FIG. 2).

[0105] <<Contents>> The contents C are not particularly limited and may be appropriately selected depending on the intended use of the resealable packaging container 400. The contents C are not particularly limited, and examples of the contents C include food, shampoo, conditioner, body soap, detergent, etc.

[0106] <Manufacturing method of packaged products> Next, an example of a method for manufacturing a packaged product 500 using the laminate 100 will be described.

[0107] First, one layered body 100 is prepared. On the other hand, the female fitting member 311 and the male fitting member 312 that constitute the chuck mechanism 310 are prepared. Then, the male fitting member 312 is fixed, for example, using an adhesive, to the surface of the sealing layer 30 in the portion that will become the surface member 100A of the laminate 100. Specifically, the support portion 312a of the male fitting member 312 is adhered to the surface of the sealing layer 30. Furthermore, a female fitting member 311 is fixed, for example, using an adhesive, to the surface of the sealing layer 30 in a portion that will become the back surface member 100B of the laminate 100. Specifically, the support portion 311a of the female fitting member 311 is adhered to the surface of the sealing layer 30. Next, the laminate 100 is folded in half so that the sealing layers 30 face each other, and the male fitting member 312 and the female fitting member 311 are overlapped, and the male fitting member 312 is fitted into the female fitting member 311. Specifically, the convex portion 312b of the male fitting member 312 is fitted into the space formed by the two protrusions 311b of the female fitting member 311. At this time, the contents C are placed between the opposing portions of the laminate 100. The overlapping peripheral edges are then heat-sealed to bond them together, thus obtaining the resealable packaging container 400 and the packaged product 500 at the same time. [Example]

[0108] The present disclosure will be explained in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0109] Example 1 A petroleum-derived biaxially stretched PET film (thickness: 12 μm) was prepared as the substrate. In addition, a material recycled (MR) biaxially stretched PET film (thickness 12 μm), which is a second recycled resin, was prepared as the second substrate. An AL vapor deposition film (thickness 10 nm) was formed on the surface of the second substrate, and then an overcoat layer (thickness 300 nm) was formed using a resin composition containing polyvinyl alcohol (PVA) and silicon alkoxide to obtain a structure. In addition, a petroleum-derived linear low-density polyethylene (LLDPE) film (thickness: 50 μm) made of 100% by mass of petroleum-derived LLDPE was prepared as a sealant film, which is a sealing layer. Then, an adhesive for dry lamination (urethane adhesive) was applied to the surface of the substrate to form an adhesive layer with a thickness of 3 μm (dry film thickness), and the second substrate of the structure was attached to this adhesive layer. Next, a dry laminating adhesive (urethane adhesive) was applied onto the overcoat layer of the structure to form an adhesive layer 3 μm thick (dry film thickness), and a sealant film, which serves as a sealing layer, was attached to this adhesive layer to produce a laminate for packaging (substrate / adhesive layer / second substrate / vapor deposition layer / overcoat layer / adhesive layer / sealing layer). From the above laminate for packaging material, rectangular front and back members each measuring 20 cm x 15 cm were cut out and prepared.

[0110] Separately, a female fitting member and a male fitting member were prepared using used packaging materials. Each was a 15 cm long resin molded product made of chemically recycled LLDPE (PCR ChemiR 100% LLDPE). The male fitting member was attached with adhesive to the surface of the seal layer of the front member, parallel to the short side (top edge) of the front member, 2 cm from the short side (top edge). The female fitting member was attached with adhesive to the surface of the seal layer of the back member, parallel to the short side (top edge) of the back member, 2 cm from the short side (top edge). The female fitting member was molded to have a tape-like support portion measuring 12 mm wide and 1.8 mm thick and two protrusions with an arc-shaped cross section provided thereon. The male fitting member was molded to have a tape-like support portion measuring 12 mm wide and 1.8 mm thick and one protrusion provided thereon.

[0111] The front and back members were then overlapped with each other with the male and female fitting members fitted together, and heat-sealing was performed, leaving only the peripheral edges of the front and back members along the short sides (upper edges) of the peripheral edges of the front and back members unsealed. In this way, a zipper-equipped packaging container having a zipper mechanism was obtained.

[0112] In the obtained resealable packaging container, the proportion of recycled resin was 57.9% by mass, and in the recycled resin contained in the resealable packaging, the proportion of the first recycled resin was 48.1% by mass and the proportion of the second recycled resin was 9.8% by mass.

[0113] Example 2 A resealable packaging container was obtained in the same manner as in Example 1, except that the resin material constituting the female fitting member and the male fitting member was changed from PCR Chemi R 100%-LDPE to material recycled LDPE (MR 100%-LDPE).

[0114] In the obtained resealable package, the proportion of recycled resin was 57.9% by mass, and in the recycled resin contained in the resealable package, the proportion of the first recycled resin was 48.1% by mass and the proportion of the second recycled resin was 9.8% by mass.

[0115] Example 3 A resealable packaging container was obtained in the same manner as in Example 1, except that the second substrate of the packaging laminate was changed from MR biaxially oriented PET film (thickness 12 μm) to a second recycled resin, chemically recycled (CR) biaxially oriented PET film (thickness 12 μm).

[0116] In the obtained resealable package, the proportion of recycled resin was 57.9% by mass, and in the recycled resin contained in the resealable package, the proportion of the first recycled resin was 48.1% by mass and the proportion of the second recycled resin was 9.8% by mass.

[0117] Example 4 A resealable packaging container was obtained in the same manner as in Example 1, except that the second substrate of the packaging laminate was changed from an MR biaxially oriented PET film (thickness 12 μm) to a CR50%-OPP film (thickness 20 μm), which is a second recycled resin. The CR50%-OPP film refers to a biaxially oriented film containing 50% by mass of chemically recycled polypropylene and 50% by mass of petroleum-derived polypropylene.

[0118] In the obtained resealable package, the proportion of recycled resin was 52.5% by mass, and in the recycled resin contained in the resealable package, the proportion of the first recycled resin was 47.3% by mass and the proportion of the second recycled resin was 5.2% by mass.

[0119] Example 5 A resealable packaging container was produced in the same manner as in Example 1, except that the resin material constituting the female fitting member and the male fitting member was changed from PCR Chemi R 100%-LDPE to PCR Chemi R 10%-LDPE, and the substrate was changed from a petroleum-derived biaxially oriented PET film (thickness 12 μm) to an MR biaxially oriented PET film (thickness 12 μm). PCR 10%-LDPE means LDPE containing 10% by mass of PCR chemical recycled low-density polyethylene and 90% by mass of petroleum-derived low-density polyethylene. In the obtained resealable package, the proportion of recycled resin was 24.3% by mass, and in the recycled resin contained in the resealable package, the proportion of the first recycled resin was 47.2% by mass and the proportion of the second recycled resin was 9.8% by mass.

[0120] (Reference example 1) A resealable packaging container was obtained in the same manner as in Example 1, except that the resin material constituting the female fitting member and the male fitting member was changed from PCR Chemi R 100%-LDPE to petroleum-derived LDPE, and the second substrate was changed from MR biaxially oriented PET film (thickness 12 μm) to petroleum-derived biaxially oriented PET film (thickness 12 μm).

[0121] In the obtained resealable packaging body, the proportion of recycled resin was 0.0 mass%, and in the recycled resin contained in the resealable packaging body, the proportion of the first recycled resin was 0.0 mass%, and the proportion of the second recycled resin was 0.0 mass%.

[0122] <Evaluation> The laminates of the Examples and Reference Examples prepared as described above were evaluated for environmental load reduction and supplyability as follows.

[0123] (1) Environmental impact reduction The environmental impact reduction was evaluated based on the following criteria, and the results are shown in Table 2. (standard) ◎◎...Recycled resin content of resealable packaging container is 20% by mass or more ◎...The proportion of recycled resin in the resealable packaging container is 10% by mass or more but less than 20% by mass ○…The proportion of recycled resin in the resealable packaging container is greater than 0% by mass but less than 10% by mass ×: The proportion of recycled resin in the resealable packaging container is 0% by mass

[0124] (2) Supplyability The feedability was evaluated based on the following criteria, and the results are shown in Table 2. (standard) ◎…Even if we secure more than 10 million resealable packaging containers per year, we expect to be able to provide a stable supply. ○…If we secure more than 1 million bags per year but less than 10 million bags per year of zipper-type packaging containers, it is expected that a stable supply will be possible. ×…It is expected that a stable supply will be difficult if more than 1 million resealable packaging containers are required per year.

[0125] [Table 1]

[0126] [Table 2]

[0127] From the results shown in Table 2, the packaging container with a zipper mechanism of the example had good environmental load reduction properties and was stable in supply.

[0128] From the above, it has been confirmed that the packaging container with a zipper mechanism of the present disclosure enables stable supply while reducing the environmental burden. [Explanation of symbols]

[0129] 10...substrate, 20...second substrate, 30...sealing layer, 60...gas barrier layer, 100...laminated body for packaging material, 300...packaging container, 310...zipper mechanism, 311...female fitting member, 312...male fitting member, 400...zippered packaging container, 500...packaged product, C...contents.

Claims

1. a packaging container obtained by using a front surface member and a back surface member that face each other; a chuck mechanism provided between the front surface member and the back surface member, The zipper mechanism is a zippered packaging container consisting of a female fitting member and a male fitting member, the front surface member and the back surface member are composed of a packaging laminate including at least a base material and a seal layer, the chuck mechanism is made of a resin molded body containing a first recycled resin, the packaging laminate contains a second recycled resin, The first recycled resin and the second recycled resin are different in type from each other, A resealable packaging container, wherein the proportion of recycled resin in the resealable packaging container is 10% or more.

2. The resealable packaging container according to claim 1 , wherein the first recycled resin comprises a chemically recycled resin.

3. The resealable packaging container according to claim 1 , wherein the first recycled resin comprises a material recycled resin.

4. The resealable packaging container according to claim 1 , wherein the second recycled resin comprises material-recycled polyethylene terephthalate.

5. The packaging container with a zipper according to claim 1 , wherein the second recycled resin is a chemically recycled resin.

6. The proportion of the first recycled resin in the recycled resin in the resealable packaging container is 10 to 90%; The resealable packaging container according to claim 1, wherein the proportion of the second recycled resin is 90 to 10%.

7. 7. The resealable packaging container according to claim 6, wherein a ratio of the second recycled resin in the recycled resin contained in the resealable packaging container is smaller than a ratio of the first recycled resin.

8. The packaging container with a zipper according to claim 1 , wherein the packaging laminate further comprises a gas barrier layer between the base material and the sealing layer.

9. The zippered packaging container according to any one of claims 1 to 8, A packaged product comprising: a packaged product; and a content contained in the resealable packaging container.

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