Laminate for packaging material, packaging container and packaged product

Abstract

To provide a laminate for a packaging material capable of enhancing cutting properties even if the ratio of a recycled resin is high, a packaging container and a packaged product.SOLUTION: A laminate for a packaging material, comprising a plurality of resin layers, wherein at least one resin layer of the plurality of resin layers is a layer obtained by subjecting a resin film to easy-cut processing, a proportion of a recycled resin in the laminate for a packaging material is 10% or more, and the recycled resin is a chemically recycled resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminate for packaging, a packaging container, and a packaging product. [Background technology]

[0002] Packaged products containing contents in a packaging container such as a packaging bag are required to be easily opened by hand to remove the contents. Therefore, packaging materials made of laminates that form the packaging containers are required to have excellent cuttability. For example, Patent Document 1 listed below discloses an easily tearable moisture-proof packaging material that is made of a laminated film including: a biaxially oriented polyethylene terephthalate film A coated with an inorganic material under reduced pressure; a biaxially oriented polyethylene terephthalate film laminated via an adhesive layer on the inorganic material-coated side of the film A; and a heat-sealable film mainly composed of polyethylene laminated directly or via an adhesive layer on the non-inorganic material-coated side of the film A. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-336940 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, from the viewpoint of environmental consideration, there has been a demand for the use of recycled materials in order to reduce the amount of petroleum materials used, reduce waste, and make effective use of resources. Therefore, it is considered to use recycled resins as resins in packaging materials such as easy-tear moisture-proof packaging materials. Such recycled materials are widely available on the market and are easily available, so-called material recycled resins are considered. However, when the laminate described in Patent Document 1 uses a material resin as the recycled resin, if the proportion of recycled resin is high, workers may feel a great deal of resistance when cutting the laminate, and there is room for improvement in terms of cuttability.

[0005] An object of the present disclosure is to provide a laminate for packaging material, a packaging container, and a packaging product that can improve cuttability even when the proportion of recycled resin is high. [Means for solving the problem]

[0006] In one aspect, the present disclosure provides "[1] a laminate for packaging comprising a plurality of resin layers, at least one of which is obtained by subjecting a resin film to an easy-cutting process, and in which the proportion of recycled resin in the laminate for packaging is 10% or more, and the recycled resin is a chemically recycled resin." Here, the proportion of recycled resin may be expressed in units of mass% or volume%. According to the above-mentioned laminate for packaging material, it is possible to improve the cuttability even when the proportion of recycled resin is high. The reason why the laminate for packaging materials of the present disclosure provides the above-mentioned effects is believed to be as follows. First, the recycled resin is a chemically recycled resin. Chemically recycled resins are produced by first breaking down discarded resin into smaller molecules through a process that involves gasifying, converting to oil, and then monomerizing the resin via refined naphtha, or by depolymerizing the resin to monomers, depending on the material's characteristics. Therefore, chemically recycled resins are less likely to be contaminated with impurities or foreign matter such as gels or aggregates than material recycled resins, which are resins made by cleaning and pulverizing recycled resin products, such as used packaging materials, and then melting them under heat to recycle them into raw materials. Therefore, even if the proportion of recycled resin is high, the presence of foreign matter on a certain line when cutting a packaging laminate is suppressed, preventing the foreign matter from interfering with the cutting process. As a result, the packaging laminate of the present disclosure is believed to be able to improve cuttability even when the proportion of recycled resin is high.

[0007] In another aspect, the present disclosure provides "the laminate for packaging materials according to [1] [2], wherein the plurality of resin layers are composed of three resin layers." In this case, it is possible to increase the freedom of selection of the resin layer to contain recycled resin, which is considered to have issues in terms of impurities and hygiene, while suppressing the thickness of the packaging laminate and improving the flexibility of the packaging laminate.

[0008] In another aspect, the present disclosure provides, "(3) the laminate for packaging material according to (1) or (2) above, wherein the easy-to-cut processing is any one of laser-based opening line forming processing, uniaxial stretching processing, and perforation processing." In this case, the cuttability of the laminate can be further improved.

[0009] In another aspect, the present disclosure provides "a laminate for packaging material according to any one of [1] to [3], wherein [4] at least one resin layer of the plurality of resin layers is a recycled resin-containing layer containing a recycled resin, and the recycled resin-containing layer has a thickness of 30 μm or more." When the thickness of the recycled resin-containing layer is 30 μm or more, if the recycled resin contained in the recycled resin-containing layer is a chemical recycled resin, the cutting ability can be significantly improved even if the proportion of recycled resin is high compared to when the recycled resin is a material recycled resin.

[0010] In another aspect, the present disclosure provides a "packaging container obtained using the laminate for packaging material according to any one of [5] and [1] to [4]." According to the above-mentioned packaging container, the packaging container includes a packaging laminate, and the packaging laminate can improve cuttability even when the proportion of recycled resin is high, so that the opening ability can be improved even when the proportion of recycled resin is high.

[0011] In another aspect, the present disclosure provides a packaging product comprising the packaging container described in [6] and [5], and contents contained in the packaging container. According to the above-mentioned packaging product, the packaging product includes a packaging container, and even if the packaging container has a high proportion of recycled resin, the openability can be improved, making it easy to open and remove the contents. [Effects of the Invention]

[0012] According to the present disclosure, a laminate for packaging material, a packaging container, and a packaging product are provided that can improve cuttability even when the proportion of recycled resin is high. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing one embodiment of a packaging laminate according to the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of one embodiment of a packaging product according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, preferred embodiments 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 redundant explanations will be omitted.

[0015] <<Packaging laminate>> First Embodiment First, one embodiment of the packaging laminate according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing one embodiment of the packaging laminate according to the present disclosure.

[0016] 1, a packaging laminate (hereinafter also simply referred to as "laminate") 100 of this embodiment includes, in this order, a first substrate 10 as a resin layer, a second substrate 20 as a resin layer, and a sealant layer 30 as a resin layer. That is, the laminate 100 includes three resin layers. At least one of the three resin layers is a layer obtained by subjecting a resin film to an easy-cutting process (hereinafter also referred to as an "easy-cutting resin layer"). The proportion of recycled resin in the laminate 100 is 10% or more, and the recycled resin is a chemically recycled resin. The laminate 100 may further include a printed layer 50 . The laminate 100 may further include a gas barrier layer 60 .

[0017] According to the laminate 100, even if the proportion of recycled resin is high, the cutting properties can be improved.

[0018] (Easy-to-cut resin layer) In the easy-cut resin layer, the easy-cut processing applied to the resin film is a processing to make it easier to cut the laminate 100. Examples of easy-cut processing include laser opening line formation processing, uniaxial stretching processing, and perforation processing. Among these, from the viewpoint of further improving the cuttability of the laminate 100, laser opening line formation processing or uniaxial stretching processing is preferred as the easy-cut processing. However, the present disclosure is particularly effective when the easy-cut processing is uniaxial stretching processing. This is because if the easy-cut processing is uniaxial stretching processing, the cut line to be cut becomes longer, and if the recycled resin contains material recycled resin, the cuttability is likely to be significantly reduced by foreign matter. The tear line is composed of multiple slits formed in a broken line, but may also be a single slit formed in a non-broken line (straight or solid line). The slit may or may not penetrate the easy-to-cut resin layer. The length of the cut is not particularly limited. The distance between adjacent cuts is not particularly limited. At least one resin layer among the first substrate 10, the second substrate 20, and the sealant layer 30 is an easy-to-cut resin layer. All of the first substrate 10, the second substrate 20, and the sealant layer 30 may be made of easy-to-cut resin layers, or only two resin layers may be made of easy-to-cut resin layers and one resin layer may be made of a non-easy-to-cut resin layer made of a resin film. Alternatively, only one resin layer may be made of an easy-to-cut resin layer and two resin layers may be made of non-easy-to-cut resin layers; for example, only the second substrate 20, only the sealant layer 30, or only the first substrate 10 may be made of an easy-to-cut resin layer.

[0019] (Recycled resin-containing layer) At least one resin layer among the first substrate 10, the second substrate 20, and the sealant layer 30 is a recycled resin-containing layer that contains a recycled resin. All of the first substrate 10, the second substrate 20, and the sealant layer 30 may be composed of recycled resin-containing layers, or only two resin layers may be composed of recycled resin-containing layers and one resin layer may be composed of a recycled resin-free layer that does not contain a recycled resin. Alternatively, only one resin layer may be composed of a recycled resin-containing layer and two resin layers may be composed of recycled resin-free layers that do not contain a recycled resin. For example, only the second substrate 20, only the sealant layer 30, or only the first substrate 10 may be composed of a recycled resin-free layer. The recycled resin-containing layer may or may not also serve as an easy-cutting resin layer.

[0020] (base material) The first substrate 10 is made of a resin layer, and the resin layer may be a layer obtained by applying an easy-to-cut process to a resin film (easy-to-cut resin layer), or, when at least one of the second substrate 20 and the sealant layer 30 is an easy-to-cut resin layer, it may be a non-easy-to-cut resin layer made of a resin film.

[0021] Examples of the resin contained in the resin film include polyolefin resin, polyester resin, and polyamide resin.

[0022] Examples of polyolefin resins include polyethylene and polypropylene.

[0023] 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. The laminate 100 can suppress the elution of low molecular weight components even when the resin contained in the resin film is polyethylene.

[0024] Polypropylene is a resin containing propylene as a structural unit, and may be a copolymer of propylene with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0025] Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Of the above resins, polyester resins are preferred from the viewpoint of ensuring strength, and polyethylene terephthalate is preferred from the viewpoint of ease of availability.

[0026] 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.

[0027] The resin may contain recycled resin, or may not contain recycled resin if at least one of the second substrate 20 and the sealant layer 30 is a recycled resin-containing layer. When the resin contains recycled resin, it may be composed of recycled resin and non-recycled resin. Here, the recycled resin is a chemically recycled resin.

[0028] The recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but is preferably PCR. PCR can be secured in large quantities on the market, so if the recycled resin is PCR, the cost of the laminate 100 can be reduced and the laminate 100 can be supplied more stably.

[0029] The non-recycled resin may be a petroleum-derived resin obtained using petroleum-derived raw material monomers, a biomass-derived resin obtained using biomass-derived raw material monomers, or a mixture thereof, but from the viewpoint of reducing the environmental load, a biomass-derived resin is preferable.

[0030] The resin film may be composed of a single layer or a laminate of multiple layers. When a resin film is composed of a laminate of multiple layers and contains recycled resin, at least one layer of the resin film must contain recycled resin. The resin film may also be a layer formed by coextrusion of a layer made of ethylene-vinyl alcohol copolymer or a layer made of polyamide, optionally with an adhesive resin, and then stretching the resulting film. Examples include a three-type, five-layer substrate consisting of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / recycled resin, a three-type, three-layer substrate consisting of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer, and a multilayer substrate consisting of petroleum-derived (natural) resin / recycled resin / petroleum-derived (natural) resin, etc. In a multilayer substrate, materials of the same type may have different specific gravities depending on their functions.

[0031] The resin film may further contain additives such as a filler, an antistatic agent, a plasticizer, a lubricant, a light-shielding pigment, and an antioxidant, as required. When the resin film contains a light-shielding pigment, the first substrate 10 can function as a light-shielding layer.

[0032] The resin film may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. If the resin film is a uniaxially stretched film, the tearability and heat resistance of the laminate 100 can be improved. If the resin film is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 100 can be improved.

[0033] When an adhesive layer is provided on the surface of the first substrate 10, 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.

[0034] The thickness of the first 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 first substrate 10 may be 15 μm or more, 20 μm or more, 25 μm or more, 30 μm or more, or 40 μm or more. The present disclosure is useful when the first substrate 10 is a recycled resin layer and the sealant layer 30 has a thickness of 30 μm or more. When the thickness of the first substrate 10 is 30 μm or more and the recycled resin contained in the first substrate 10 is a chemical recycled resin, the cutting ability can be significantly improved even if the proportion of recycled resin is high compared to when the recycled resin is a material recycled resin. The thickness of the first substrate 10 may be 40 μm or more. The thickness of the first substrate 10 may be 60 μm or less, or 50 μm or less.

[0035] (sealant layer) The sealant layer 30 is made of a resin layer, and the resin layer may be a layer obtained by applying an easy-to-cut process to a resin film (easy-to-cut resin layer), or, when at least one of the second substrate 20 and the first substrate 10 is an easy-to-cut resin layer, it may be a non-easy-to-cut resin layer made of a resin film.

[0036] Examples of resins used for the resin film include polyolefin resins and polyester resins.

[0037] Examples of polyolefin resins include polyethylene and polypropylene, among which polyethylene is preferred from the viewpoint of low-temperature sealing properties.

[0038] 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.

[0039] Polypropylene is a resin containing propylene as a structural unit, and 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.

[0040] Examples of polyester resins include polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate. Of the above resins, polyester resins are preferred from the viewpoint of ensuring strength, and polyethylene terephthalate is preferred from the viewpoint of ease of availability.

[0041] In this embodiment, the resin may or may not contain a recycled resin. When the resin contains a recycled resin, the resin may be composed of a recycled resin and a non-recycled resin. The recycled resin is made of chemically recycled resin.

[0042] The recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but is preferably PCR. PCR can be secured in large quantities on the market, so if the recycled resin is PCR, the cost of the laminate 100 can be reduced and the laminate 100 can be supplied more stably. Furthermore, even when the above resin contains polyethylene as a recycled resin, the laminate 100 can sufficiently suppress the leaching of low molecular weight components into the liquid contents when the sealant layer 30 comes into contact with the liquid contents.

[0043] The non-recycled resin may be a petroleum-derived resin obtained using petroleum-derived raw material monomers, a biomass-derived resin obtained using biomass-derived raw material monomers, or a mixture thereof, but from the viewpoint of reducing the environmental load, a biomass-derived resin is preferable.

[0044] The resin film preferably has a melting point lower than that of the first substrate 10. In this case, when the laminate 100 is heat-sealed, it is possible to heat-seal the sealant layer 30 while suppressing melting of the first substrate 10. Furthermore, by heating the laminate 100, the first substrate 10 and the sealant layer 30 can be easily separated, and the first substrate 10 and the sealant layer 30 can be easily recycled.

[0045] The resin film 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 resin film contains a light-shielding pigment, the sealant layer 30 can function as a light-shielding layer.

[0046] The resin film may be composed of a single layer or a laminate of multiple layers. When the resin film is composed of a single layer, the resin film may be composed solely of recycled resin or may be composed of recycled and non-recycled resins, but is preferably composed of recycled and non-recycled resins. In this case, the concentration of recycled resin in the resin film can be reduced, thereby preventing foreign matter resulting from the recycled resin from contaminating the contents. Furthermore, since the recycled resin is a chemically recycled resin, which is superior in terms of hygiene and quality, it can also reduce psychological resistance to the recycled resin coming into contact with the contents. Furthermore, since the recycled resin is composed of a chemically recycled resin, the sealant layer 30 is superior in terms of hygiene and quality.

[0047] When the resin film is composed of a laminate of multiple layers, all of the layers may contain recycled resin, or only some of the layers may contain recycled resin, with the remaining layers containing non-recycled resin. Here, the layer containing the non-recycled resin is preferably located farthest from the first substrate 10. The layer of the sealant layer 30 located farthest from the first substrate 10 is the layer that comes into contact with the contents when the contents are placed in a packaging container obtained using the laminate 100. If this layer contains a non-recycled resin, it is possible to further reduce the possibility that impurities or foreign matter such as gels or aggregates will migrate into the contents as a result of heating during retort or boiling treatment of the packaging container. Therefore, the laminate 100 can be used safely to package contents such as food.

[0048] 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.

[0049] The sealant layer 30 may also be colored white or the like. For example, a white sealant containing a titanium oxide-based white pigment can be used as the sealant layer 30. Note that the sealant layer 30 is not limited to a white sealant, and may be composed of a sealant of a different color by containing a pigment other than the white pigment. The resin film may be an unstretched film or a stretched film. The stretched film may be a uniaxially stretched film or a biaxially stretched film. The sealant layer 30 is preferably an unstretched film. In this case, the melting point of the sealant layer 30 can be easily lowered, and melting of the first substrate 10 can be easily suppressed when the laminate 100 is heat-sealed.

[0050] The thickness of the sealant layer 30 is not particularly limited and may be adjusted as appropriate. The thickness of the sealant layer 30 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 present disclosure is useful when the sealant layer 30 is a recycled resin layer and when the thickness of the sealant layer 30 is 30 μm or more. When the thickness of the sealant layer 30 is 30 μm or more and the recycled resin contained in the sealant layer 30 is a chemical recycled resin, the cuttability can be significantly improved even if the proportion of recycled resin is high compared to when the recycled resin is a material recycled resin. The thickness of the sealant layer 30 may be 40 μm or more or 50 μm or more. The thickness of the sealant layer 30 may also be 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, 80 μm or less, or 60 μm or less.

[0051] (Second base material) The second base material 20 is a base material that reinforces the first base material 10, and can further improve the strength of the laminate 100. The second substrate 20 is made of a resin layer, and the resin layer may be an easy-to-cut resin layer, or if at least one of the first substrate 10 and the sealant layer 30 is an easy-to-cut resin layer, it may be a non-easy-to-cut resin layer made of a resin film.

[0052] Examples of the resin include polyolefin resin, polyester resin, and polyamide resin. The polyolefin resin, polyester resin, and polyamide resin may be the same as the resin used for the resin film forming the first substrate 10. In this embodiment, the resin may contain a recycled resin, or may not contain a recycled resin if at least one of the first substrate 10 and the sealant layer 30 is a recycled resin-containing layer. When the resin contains a recycled resin, it may be composed of a recycled resin and a non-recycled resin. The recycled resin is made of chemically recycled resin.

[0053] The recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but is preferably PCR. PCR can be secured in large quantities on the market, so if the recycled resin is PCR, the cost of the laminate 100 can be reduced and the laminate 100 can be supplied more stably.

[0054] The non-recycled resin may be a petroleum-derived resin obtained using petroleum-derived raw material monomers, a biomass-derived resin obtained using biomass-derived raw material monomers, or a mixture thereof, but from the viewpoint of reducing the environmental load, a biomass-derived resin is preferable.

[0055] The resin film may be composed of a single layer or a laminate of multiple layers. When the resin film is composed of a single layer, the resin film contains recycled resin as the resin. When the resin film is composed of a laminate of multiple layers, all of the layers may contain recycled resin, or only some of the layers may contain non-recycled resin, with the remaining layers containing 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 and second outer layers may contain a non-recycled resin, and the intermediate layer may contain a recycled resin. In this case, the possibility that impurities or foreign matter such as gels or aggregates will migrate from the second substrate 20 through the sealant layer 30 to the contents due to heating during retort or boiling of the packaging container can be further reduced. Therefore, the laminate 100 can be used safely to package contents such as food.

[0056] The thickness of the second base material 20 is not particularly limited and may be adjusted as appropriate. The thickness of the second base material 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 present disclosure is useful when the second substrate 20 is a recycled resin layer and when the thickness of the second substrate 20 is 30 μm or more. When the thickness of the second substrate 20 is 30 μm or more and the recycled resin contained in the second substrate 20 is a chemical recycled resin, the cutting ability can be significantly improved even if the proportion of recycled resin is high compared to when the recycled resin is a material recycled resin. The thickness of the second substrate 20 may be 40 μm or more or 50 μm or more. The thickness of the second base material 20 may be 100 μm or less, 80 μm or less, or 60 μm or less.

[0057] (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").

[0058] Examples of adhesives include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0059] 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.

[0060] 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.

[0061] The adhesive resin layer may be an extruded or non-extruded resin layer. The adhesive resin is a heat-sealable adhesive thermoplastic resin that can be melted by heat and fused to each other. For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, 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.

[0062] 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.

[0063] (Printing layer) The print layer 50 is a layer that displays characters, pictures, etc., and can be formed using ink. The printed layer 50 may be provided between layers, or as shown in FIG. 1 , may be provided as the outermost layer of the laminate 100. When the printed layer 50 is provided between layers, the printed layer 50 may be provided on the surface (inner surface) of the first substrate 10 facing the sealant layer 30. When the printed layer 50 is provided on the inner surface of the first substrate 10, the printed layer 50 is protected by the first substrate 10, thereby preventing deterioration of the printed layer 50. When the printed layer 50 is provided on the outer surface of the first substrate 10 and serves as the outermost layer of the laminate 100, the printed layer 50 can be easily removed when recycling a package containing the laminate 100 after disposal. Furthermore, when the laminate 100 includes a second substrate 20 as shown in FIG. 1 , the printed layer 50 may be provided on the second substrate 20. Here, the printed layer 50 may be provided between the first substrate 10 and the second substrate 20, or between the second substrate 20 and the sealant layer 30.

[0064] As the ink, for example, inks obtained by adding various pigments, plasticizers, drying agents, stabilizers, etc. to a binder resin such as urethane resin, acrylic resin, nitrocellulose resin, or rubber can be used.

[0065] 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 environmental impact.

[0066] Furthermore, an easily recyclable ink can also be used as the ink. By using an easily recyclable ink, it becomes possible to easily recycle the packaging containing the laminate 100 after it has been discarded. Specifically, an example of an easily recyclable ink is "SunSpectro Solvawash" manufactured by DIC Corporation.

[0067] (gas barrier layer) 1, the laminate 100 may include a gas barrier layer 60. The gas barrier layer 60 may be provided on at least one surface of the first substrate 10. Alternatively, the gas barrier layer 60 may be provided on at least one surface of the second substrate 20. The gas barrier layer 60 is a layer that improves the gas barrier properties of the laminate 100, and has barrier properties against gases such as water vapor or oxygen.

[0068] 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 aluminum oxide and silicon oxide (silica). When the gas barrier layer 60 is a vapor-deposited layer of a metal such as aluminum, the gas barrier layer 60 can function as a light-shielding layer. In addition, when the gas barrier layer 60 has a vapor deposition layer, the gas barrier layer 60 may further have an anchor coat layer between the first substrate 10 or the second substrate 20 and the vapor deposition layer in order to improve adhesion between the first substrate 10 or the second substrate 20 and the vapor deposition layer.

[0069] 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 urethane.

[0070] (Laminate) (A) Percentage of recycled resin in the laminate In the laminate 100, the proportion A of recycled resin in the laminate 100 is 10% or more. When the proportion of recycled resin in the recycled resin-containing layer is 100% by volume (100% by mass), A can be determined as the proportion of the total thickness of the recycled resin-containing layer to the total thickness of the laminate 100. However, when the proportion of recycled resin in the recycled resin-containing layer is X% by mass (less than 100% by mass) and the thickness of the recycled resin-containing layer is Y1 (μm), A is calculated by converting the thickness of the recycled resin-containing layer into Y2 (μm) = (X / 100) × Y1 (μm). A is preferably 20% or more, more preferably 25% or more, even more preferably 30% or more, and particularly preferably 40% or more.

[0071] (B) Ratio of recycled resin in the recycled resin-containing layer The proportion B of recycled resin in the recycled resin-containing layer is not particularly limited, but is preferably 10 to 90% based on the total amount of recycled resin in the recycled resin-containing layer, and is expressed in volume % or mass %. In this case, the recycled resin is dispersed in a balanced manner in at least two recycled resin-containing layers, which allows for a more stable supply of the laminate 100. Although B is not particularly limited, when the number of recycled resin-containing layers in the laminate 100 is three, B is preferably 25 to 40%, more preferably 30 to 35%, from the viewpoint of dispersing the recycled resin in the recycled resin-containing layers in a balanced manner. When the number of recycled resin-containing layers in the laminate 100 is two, B is preferably 40 to 60%, more preferably 45 to 55%, from the viewpoint of dispersing the recycled resin in the recycled resin-containing layers in a balanced manner.

[0072] <<Packaging products>> Next, an embodiment of a packaging product according to another aspect of the present disclosure will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view showing an embodiment of a packaging product according to another aspect of the present disclosure.

[0073] As shown in FIG. 2, the packaged product 500 includes a packaging bag 400 as a packaging container and contents C contained in the packaging bag 400. The packaging bag 400 is obtained using a pair of laminates 100. The packaging bag 400 is obtained, for example, by bringing the sealant layers 30 of the pair of laminates 100 face each other and bonding their peripheral edges together. The packaging bag 400 is composed of a storage section that stores the contents C and an adhesive section that is provided around the storage section. The adhesive section is a section formed by bonding the sealant layers 30 of opposing laminates 100 together, and the packaging section is a section where the sealant layers 30 of opposing laminates 100 are not bonded together.

[0074] According to the packaging product 500, the packaging product includes a packaging bag 400, and since the packaging bag 400 can improve openability even if it contains a high proportion of recycled resin, it can be easily opened and the contents C can be easily removed.

[0075] (Contents) The contents C are not particularly limited and may be selected appropriately depending on the intended use of the packaging bag 400. The contents C are not particularly limited, and examples of the contents C include food, shampoo, conditioner, body soap, detergent, etc.

[0076] (packaging bag) The pair of laminates 100 constituting the packaging bag 400 may have the same configuration as each other, or may have different configurations from each other.

[0077] When the packaging bag 400 has a tear line, it may further have an easy-to-open processed part at both ends or one end of the tear line. Examples of the easy-to-open processed part include a group of scars, and a V-shaped, U-shaped or I-shaped notch.

[0078] In the adhesive portion of the packaging bag 400, the sealant layers 30 of the pair of laminates 100 may be directly bonded to each other by heat sealing (see FIG. 2), or may be bonded to each other by an adhesive.

[0079] (Manufacturing method of packaged products) Next, an example of a method for manufacturing a packaged product 500 using the laminate 100 will be described.

[0080] First, a pair of laminates 100 is prepared. Then, the sealant layers 30 of the pair of laminates 100 are placed opposite each other and bonded together. At this time, parts of the peripheral edges of the laminate are bonded together in a U-shape to form bonded areas, and unbonded areas (unbonded areas) are also formed. In this way, a packaging bag having an opening formed by the unbonded areas is obtained.

[0081] Next, the contents C are filled into the packaging bag through the opening. Thereafter, the sealant layers 30 of the laminate 100 are bonded together at the unbonded portions, thereby turning the unbonded portions into bonded portions. In this manner, a packaged product 500 including the packaging bag 400 and the contents C contained therein can be manufactured.

[0082] Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments. For example, in the packaged product 500 shown in Fig. 2, the packaging bag 400 is formed using a pair of laminates 100. However, the packaging bag may be manufactured by folding one laminate 100 with the sealant layer 30 on the inside and bonding the overlapping peripheral edges together.

[0083] 2, the packaging bag 400 is a four-sided bag, but it may also be a standing pouch-shaped packaging bag, a two-sided bag, a three-sided bag, a palm-shaped bag, or a gusset bag. The packaging bag 400 may be provided with a stopper, or may be provided with a synthetic resin zipper that can be repeatedly sealed by fitting a strip-shaped protrusion into a strip-shaped groove.

[0084] In the above embodiment, the packaging container is a packaging bag, but the packaging container may be a tube container. In this case, the laminate 100 further includes a second sealant layer on the opposite side of the substrate 10 from the sealant layer 30.

[0085] Furthermore, in the above embodiment, the laminate 100 includes three resin layers, but the laminate 100 may include any number of resin layers. Therefore, the laminate 100 may include two resin layers. For example, the laminate 100 includes the second substrate 20, but the second substrate 20 may be omitted. That is, the laminate 100 may include two resin layers, the first substrate 10 and the sealant layer 30. Furthermore, the laminate 100 may include four or more resin layers. [Example]

[0086] The present disclosure will be explained in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0087] Example 1 As the first substrate, a resin film made of petroleum-derived biaxially stretched polyethylene terephthalate (PET) film (thickness: 18 μm) was prepared. In addition, a resin layer made of petroleum-derived biaxially stretched PET film (thickness 18 μm) was prepared as the second substrate, and AlO X After forming a vapor deposition layer (thickness 10 nm), an overcoat layer (thickness 200 nm) was formed using a resin composition containing polyvinyl alcohol (PVA) and silicon alkoxide to obtain a structure. In addition, a resin layer (hereinafter also referred to as "laminated sealant film") was prepared as a sealant layer, which was made by laminating, in this order, a petroleum-derived linear low-density polyethylene (LLDPE) film (thickness 20 μm), a CR100% LLDPE film (thickness 20 μm) made of 100% chemically recycled LLDPE, and a petroleum-derived LLDPE film (thickness 20 μm).

[0088] Then, a dry laminating adhesive (polyurethane adhesive) was applied to the surface of the first substrate to form an adhesive layer with a thickness of 3 μm (dry film thickness), and the second substrate of the above structure was attached to this adhesive layer. Next, a dry laminating adhesive (polyurethane adhesive) was applied onto the overcoat layer of the above structure to form an adhesive layer with a thickness of 3 μm (dry film thickness), and a laminated sealant film, which served as a sealant layer, was attached to this adhesive layer. Finally, the first substrate was processed to form a tear line using a laser (hereinafter also referred to as "laser processing"), and the first substrate was made into a resin layer. At this time, the tear line was composed of a single linear cut that penetrated the first substrate. Thus, a laminate for packaging material (first substrate / adhesive layer / second substrate / AlO X The ratio of recycled resin in the obtained laminate for packaging material was as shown in Table 1.

[0089] Example 2 A packaging laminate was obtained in the same manner as in Example 1, except that a petroleum-derived oriented nylon (ONy) film (thickness 18 μm) was used as the resin film for forming the first base material instead of the petroleum-derived biaxially oriented PET film (thickness 18 μm), and a CR100% LLDPE film (thickness 50 μm) was used as the sealant layer instead of the laminated sealant film. The proportion of recycled resin in the obtained packaging laminate was as shown in Table 1.

[0090] Example 3 A packaging laminate was obtained in the same manner as in Example 1, except that, as the first substrate, a resin layer made of a uniaxially oriented LLDPE film (20 μm thick) obtained by uniaxially stretching a CR100% LLDPE film was used instead of the resin layer obtained by laser processing a petroleum-derived biaxially oriented PET film (18 μm thick), a petroleum-derived LLDPE film (20 μm thick) made of petroleum-derived LLDPE was prepared instead of the petroleum-derived biaxially oriented PET film (18 μm thick), and a petroleum-derived LLDPE film (50 μm thick) was used as the sealant layer instead of a laminate sealant film. The proportion of recycled resin in the resulting packaging laminate was as shown in Table 1.

[0091] Example 4 A packaging laminate was obtained in the same manner as in Example 1, except that the first substrate was not used and a resin layer (thickness 18 μm) obtained by uniaxially stretching a petroleum-derived LDPE film was used as the second substrate instead of the petroleum-derived biaxially stretched PET film (thickness 18 μm). The proportion of recycled resin in the obtained packaging laminate was as shown in Table 1.

[0092] Example 5 A packaging laminate was obtained in the same manner as in Example 1, except that a petroleum-derived OPP film (18 μm thick) was used as the resin film for forming the first substrate instead of the petroleum-derived biaxially oriented PET film (18 μm thick), a petroleum-derived OPP film (18 μm thick) was used as the second substrate instead of the petroleum-derived biaxially oriented PET film (18 μm thick), and a CR100% unstretched polypropylene (CPP) film (50 μm thick) was used as the sealant layer instead of the laminated sealant film. The proportion of recycled resin in the obtained packaging laminate was as shown in Table 1.

[0093] (Comparative Example 1) A packaging laminate was obtained in the same manner as in Example 1, except that a petroleum-derived biaxially oriented LDPE film (thickness 18 μm) was used as the resin film for forming the first base material instead of the petroleum-derived biaxially oriented PET film (thickness 18 μm), and a material recycled (MR) 100% LLDPE film (thickness 50 μm) was used as the sealant layer instead of the laminate sealant film. The proportion of recycled resin in the obtained packaging laminate was as shown in Table 1.

[0094] (Comparative Example 2) A laminate for packaging was obtained in the same manner as in Example 3, except that a uniaxially oriented LLDPE film (thickness 20 μm) obtained by uniaxially stretching an MR100% LLDPE film was used as the first substrate instead of the uniaxially oriented LLDPE film (thickness 20 μm) obtained by uniaxially stretching a CR100% LLDPE film. The proportion of recycled resin in the obtained laminate for packaging was as shown in Table 1.

[0095] (Comparative Example 3) A laminate for packaging was obtained in the same manner as in Example 1, except that a petroleum-derived LLDPE film (thickness: 50 μm) was used as the sealant layer instead of the laminate sealant film. The proportion of recycled resin in the obtained laminate for packaging was as shown in Table 1.

[0096] <Evaluation> Test samples of 15 cm x 20 cm were cut out from the laminates for packaging materials of the Examples and Comparative Examples prepared as described above, and the cuttability of these test samples was evaluated as follows.

[0097] (Cutting ability) The cuttability was evaluated by an operator along the tear line if the first substrate was a resin layer obtained by laser processing a resin film, or along the uniaxial stretching direction if the first substrate was a resin layer obtained by uniaxial stretching a resin film, and the results are shown in Table 1. (standard) 〇…No snagging (resistance) during cutting ×...There is resistance during the cutting process

[0098] [Table 1]

[0099] From the results shown in Table 1, the cuttability of the laminates of Examples 1 to 5 was "good" even when the proportion of recycled resin was increased to 10% or more. In contrast, it was found that the cuttability of the laminates of Comparative Examples 1 and 2 was "poor" when the proportion of recycled resin was increased to 10% or more. Note that the cuttability of the laminate of Comparative Example 3 was "good", but the proportion of recycled resin was 0.0%.

[0100] From the above, it was confirmed that the laminate for packaging materials of the present disclosure can improve cuttability even when the proportion of recycled resin is high. [Explanation of symbols]

[0101] 10...substrate (resin layer), 20...second substrate (resin layer), 30...sealant layer (resin layer), 60...gas barrier layer, 100...laminated body, 400...packaging bag (packaging container), 500...packaged product, C...contents.

Claims

1. A packaging laminate comprising a plurality of resin layers, at least one resin layer of the plurality of resin layers is a layer obtained by subjecting a resin film to an easy-cutting process, The proportion of recycled resin in the packaging laminate is 10% or more, The laminate for packaging materials, wherein the recycled resin is a chemically recycled resin.

2. The packaging laminate according to claim 1 , wherein the plurality of resin layers are composed of three resin layers.

3. The laminate for packaging materials according to claim 1, wherein the easy-to-cut processing is any one of a laser opening line forming processing, a uniaxial stretching processing, and a perforation processing.

4. At least one resin layer of the plurality of resin layers is a recycled resin-containing layer containing a recycled resin, 2. The packaging laminate according to claim 1, wherein the recycled resin-containing layer has a thickness of 30 μm or more.

5. A packaging container obtained by using the packaging laminate according to any one of claims 1 to 4.

6. The packaging container according to claim 5 ; and a content contained within the packaging container.

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