Laminate for packaging material, packaging container and packaged product

Abstract

To provide a laminate for a packaging material capable of suppressing the lowering of appearance, printability and strength while enabling stable supply 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 the laminate comprises a plurality of different types of recycled resins. The plurality of resin layers may include at least two recycled resin-containing layers containing recycled resins, and the types of recycled resins contained in the recycled resin-containing layers may be different from each other in at least two recycled resin-containing layers among all the recycled resin-containing layers.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] Packaging materials are generally provided with multiple resin layers because they are required to have various functions. In recent years, there has been a demand for the use of recycled materials in order to reduce the environmental burden by reducing waste and making effective use of resources, and packaging materials in which recycled resins are blended into some of the resin layers have come into use. For example, Patent Document 1 below discloses a laminate obtained by laminating a sealant film on at least one side of a biaxially oriented polyamide film, which has at least two layers: a base layer and a surface layer, and each of the base layer and the surface layer contains chemically recycled polyamide 6 resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-14436 Summary of the Invention [Problem to be solved by the invention]

[0004] In the laminate described in Patent Document 1, the base layer and the surface layer each require chemically recycled polyamide 6 resin. Therefore, if the proportion of chemically recycled polyamide 6 resin in the laminate is increased, it becomes necessary to secure a large amount of chemically recycled polyamide 6 resin. However, in this case, it may become difficult to stably supply chemically recycled polyamide 6 resin on the market. Furthermore, if the proportion of recycled resin in the laminate is high, the appearance, printability, and strength may be more likely to deteriorate.

[0005] The present disclosure aims to provide a laminate for packaging materials, a packaging container, and a packaging product that can be supplied stably and that suppress deterioration in appearance, printability, and strength, even when the proportion of recycled resin is high. [Means for solving the problem]

[0006] The present disclosure provides, as one aspect, "a laminate for packaging material comprising a plurality of resin layers, The laminate for packaging material contains a plurality of different types of recycled resins. According to the packaging laminate, the laminate contains multiple different types of recycled resins. Therefore, when the proportion of recycled resins in the packaging laminate is constant, the amount of recycled resin required per type can be reduced compared to when the laminate contains only one type of recycled resin. This makes it easier to stably secure recycled resins for each type, and as a result, it becomes easier to stably supply packaging laminates. Furthermore, because the amount of recycled resin required per type can be reduced, even if only certain types of recycled resins tend to cause deterioration in the appearance, printability, and strength of the laminate, deterioration in the appearance, printability, and strength of the laminate as a whole can be suppressed, even if the proportion of recycled resins in the packaging laminate is high.

[0007] In another aspect, the present disclosure provides "a laminate for packaging material according to [1] [2], wherein the plurality of resin layers include at least two recycled resin-containing layers containing recycled resin, and at least two of all the recycled resin-containing layers contain different types of recycled resin." According to the packaging laminate, the multiple resin layers include at least two recycled resin-containing layers containing recycled resin, and at least two of all the recycled resin-containing layers contain different types of recycled resin. Therefore, when the proportion of recycled resin in the packaging laminate is constant, the amount of recycled resin required per type can be reduced compared to when two or more of the multiple resin layers are each composed of recycled resin-containing layers containing a single type of recycled resin and the recycled resins in the recycled resin layers are the same type, or when only one of the multiple resin layers is composed of a recycled resin-containing layer containing a single type of recycled resin. This makes it easier to steadily secure recycled resins for each type, and as a result, facilitates a stable supply of packaging laminates. Furthermore, even when the proportion of recycled resin in the packaging laminate is high, because the recycled resin is dispersed across at least two recycled resin-containing layers, degradation of appearance, printability, and strength due to the recycled resin can be more effectively prevented than when one type of recycled resin is concentrated in only one recycled resin-containing layer.

[0008] In another aspect, the present disclosure provides "a laminate for packaging material according to [1] or [2], wherein the recycled resin accounts for 5% or more of the laminate for packaging material (3)." This packaging laminate is composed of multiple different types of recycled resins, allowing for a reduction in the amount of each type of recycled resin. Therefore, even if only certain types of recycled resins tend to cause deterioration in the appearance, printability, and strength of the laminate, even if the proportion of recycled resin in the packaging laminate is high, the deterioration in appearance, printability, and strength of the laminate as a whole can be suppressed. As a result, even if the proportion of recycled resin in the packaging laminate is as high as 5% or more, the deterioration in appearance, printability, and strength due to the recycled resin can be suppressed. Furthermore, if at least two of the recycled resin-containing layers contain different types of recycled resin, even if the proportion of recycled resin in the packaging laminate is as high as 5% or more, the recycled resin is dispersed across at least two recycled resin-containing layers, thereby suppressing the deterioration in appearance, printability, and strength due to the recycled resin, compared to when one type of recycled resin is concentrated in only one recycled resin-containing layer. Here, the proportion of recycled resin may be expressed in either mass% or volume%.

[0009] In another aspect, the present disclosure provides "[4] the laminate for packaging according to [3], wherein the proportion of the recycled resin in the laminate for packaging is preferably 10% or more, more preferably 20% or more, and even more preferably 30% or more." This packaging laminate is composed of multiple different types of recycled resins, allowing the amount of each type of recycled resin to be reduced. Therefore, even if only certain types of recycled resins tend to cause deterioration in the appearance, printability, and strength of the laminate, and even if the proportion of recycled resin in the packaging laminate is high, the deterioration in appearance, printability, and strength of the laminate as a whole can be suppressed. As a result, even if the proportion of recycled resin in the packaging laminate is as high as 10% or more, the deterioration in appearance, printability, and strength caused by the recycled resin can be suppressed. Furthermore, if at least two of all recycled resin-containing layers contain different types of recycled resin, even if the proportion of recycled resin in the packaging laminate is as high as 10% or more (more preferably 20% or more, and even more preferably 30% or more), the recycled resin is dispersed in at least two recycled resin-containing layers, thereby suppressing the deterioration in appearance, printability, and strength caused by the recycled resin compared to when one type of recycled resin is concentrated in only one recycled resin-containing layer.

[0010] The present disclosure also provides, as another aspect, "(5) the laminate for packaging materials according to any one of (1) to (4) above, wherein the plurality of resin layers is three resin layers." In this case, the number of recycled resin-containing layers in which the recycled resin is dispersed can be increased compared to when the multiple resin layers are two resin layers, which makes it easier to secure different types of recycled resin more stably and, as a result, makes it easier to supply packaging laminates more stably.

[0011] In another aspect, the present disclosure provides "a laminate for packaging material according to any one of [6] to [5], wherein the recycled resin contained in at least one of all of the recycled resin-containing layers includes a chemical recycled resin." Chemically recycled resins are produced by first breaking down waste resins into smaller molecules through a process that involves gasifying, converting them into oil, and then converting them into monomers through refined naphtha, or by depolymerizing them, depending on the material's characteristics. Therefore, chemically recycled resins are less likely to be contaminated with foreign matter such as impurities, gels, and aggregates than material recycled resins, which are made by cleaning, crushing, and then melting resin products such as used packaging materials to recycle them into raw materials. Furthermore, chemically recycled resins are not subject to heat treatments such as melting after the recycling process, making them less susceptible to thermal degradation than material recycled resins. Therefore, even with a high proportion of recycled resin, deterioration in appearance, printability, and strength of packaging laminates can be more effectively prevented.

[0012] In another aspect, the present disclosure provides "a laminate for packaging material according to any one of [7] to [6], wherein the recycled resin contained in at least one of all of the recycled resin-containing layers comprises material recycled polyethylene terephthalate." Currently, collection and recycling schemes for material recycled polyethylene terephthalate have been established, and the supply is relatively stable. Therefore, if the recycled resin contained in at least one of all recycled resin-containing layers contains material recycled polyethylene terephthalate, a more stable supply of packaging laminates is possible.

[0013] In another aspect, the present disclosure provides "a laminate for packaging according to any one of [8] to [7], wherein the proportion of the recycled resin in the recycled resin-containing layer is 10 to 90% based on the total amount of the recycled resin in the laminate." According to this packaging laminate, when at least two of all recycled resin-containing layers contain different types of recycled resin, the recycled resin is dispersed in a balanced manner in the at least two recycled resin-containing layers, thereby enabling a more stable supply of packaging laminates.

[0014] In another aspect, the present disclosure provides a "packaging container obtained using the laminate for packaging material according to any one of [9] and [1] to [8]." According to the above-mentioned packaging container, since the packaging container includes the packaging laminate, even if the proportion of recycled resin is high, it is possible to ensure a stable supply and to suppress deterioration in appearance, printability, and strength.

[0015] In another aspect, the present disclosure provides a "packaging product comprising the packaging container described in

[10] and [9] and contents contained in the packaging container." According to the above-described packaging product, since the packaging container includes the laminate for packaging material, even if the proportion of recycled resin is high, it is possible to ensure a stable supply and to suppress deterioration in appearance, printability, and strength. [Effects of the Invention]

[0016] According to the present disclosure, there are provided a laminate for packaging materials, a packaging container, and a packaging product that can be supplied stably and that can suppress deterioration in appearance, printability, and strength even when the proportion of recycled resin is high. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view showing a first embodiment of a packaging laminate according to the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view showing a second embodiment of a packaging laminate according to the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view of one embodiment of a packaging product according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0018] Preferred embodiments of the present disclosure will be described in detail below. In the drawings, the same or corresponding parts are designated by the same reference numerals, and redundant explanations will be omitted.

[0019] <<Packaging laminate>> First Embodiment First, a first embodiment of a packaging laminate according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing the first embodiment of a packaging laminate according to the present disclosure.

[0020] 1, a packaging laminate (hereinafter also simply referred to as "laminate") 100 of this embodiment includes, in this order, a base material 10 as a resin layer, a second base material 20 as a resin layer, and a sealant layer 30 as a resin layer. That is, the laminate 100 includes three resin layers. The laminate 100 contains a plurality of different types of recycled resins. Here, "different from one another" means that the recycled resins are made from different materials, or even if the recycled resins are made from the same materials, the recycling methods used in the manufacturing process are different. For example, chemically recycled polyethylene terephthalate and chemically recycled polyethylene are made from different materials, and therefore have different types of recycled resins.Furthermore, chemically recycled polyethylene terephthalate and material recycled polyethylene terephthalate are made using different recycling methods in the manufacturing process, and therefore have different types of recycled resins.

[0021] According to the laminate 100, the laminate 100 contains multiple different types of recycled resins. Therefore, when the proportion of recycled resins in the laminate 100 is constant, it is possible to reduce the amount of recycled resin required per type compared to when a single type of recycled resin is used in the three resin layers. This makes it easier to stably secure recycled resins for each type, and as a result, it is easier to stably supply the laminate 100. Furthermore, because it is possible to reduce the amount of recycled resin required per type, even if only certain types of recycled resins tend to cause deterioration in the appearance, printability, and strength of the laminate 100, and the proportion of recycled resins in the laminate 100 is high, deterioration in the appearance, printability, and strength of the laminate 100 as a whole can be suppressed.

[0022] In the laminate 100, one of the resin layers of the substrate 10, the second substrate 20, and the sealant layer 30 may be composed of a recycled resin-containing layer containing a recycled resin, and the recycled resin may contain multiple different types of recycled resins, or at least two of the resin layers of the substrate 10, the second substrate 20, and the sealant layer 30 may be composed of recycled resin-containing layers containing a recycled resin.

[0023] When at least two of the resin layers among the substrate 10, the second substrate 20, and the sealant layer 30 are composed of recycled resin-containing layers that contain recycled resin, three resin layers 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 recycled resin. For example, only the second substrate 20, only the sealant layer 30, or only the substrate 10 may be composed of a recycled resin-free layer, and the remaining resin layers may be composed of recycled resin-containing layers.

[0024] When at least two resin layers among the substrate 10, the second substrate 20, and the sealant layer 30 are composed of recycled resin-containing layers that contain recycled resin, the types of recycled resin contained in at least two of all recycled resin-containing layers may be different from each other. For example, when the substrate 10, the second substrate 20, and the sealant layer 30, which are multiple resin layers, include three recycled resin-containing layers that contain recycled resin, the types of recycled resin contained in the substrate 10, the second substrate 20, and the sealant layer 30 as recycled resin-containing layers are different from each other. Therefore, when the proportion of recycled resin in laminate 100 is constant, the amount of recycled resin required per type can be reduced compared to when two or more of the multiple resin layers (substrate 10, second substrate 20, and sealant layer 30) are each composed of recycled resin-containing layers containing a single type of recycled resin and the recycled resins in the recycled resin layers are the same type, or when only one of the multiple resin layers (substrate 10, second substrate 20, and sealant layer 30) (e.g., only substrate 10) is composed of a recycled resin-containing layer containing a single type of recycled resin. This makes it easier to stably secure recycled resins for each type, and as a result, it is easier to stably supply laminate 100. Furthermore, even when the proportion of recycled resin in laminate 100 is high, because the recycled resin is dispersed among the three recycled resin-containing layers (substrate 10, second substrate 20, and sealant layer 30), deterioration in appearance, printability, and strength due to the recycled resin can be more effectively prevented than when one type of recycled resin is concentrated in only one recycled resin-containing layer.

[0025] The proportion of recycled resin in the laminate 100 may be 5% or more. The laminate 100 may further include a printed layer 50 . The laminate 100 may further include a gas barrier layer 60 .

[0026] (base material) The substrate 10 is made of a resin layer, and the resin layer contains a resin, such as a polyolefin resin, a polyester resin, or a polyamide resin.

[0027] Examples of polyolefin resins include polyethylene and polypropylene.

[0028] 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 substrate 10 is polyethylene.

[0029] 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.

[0030] 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. 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.

[0031] The resin may or may not contain recycled resin. When the resin contains recycled resin, it may be composed of recycled resin and non-recycled resin. Examples of recycled resins include chemical recycled resins and material recycled resins. These can be used alone or in combination. From the viewpoint of stable supply, it is preferable to use material recycled polyethylene terephthalate as the recycled resin.

[0032] 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.

[0033] 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 preferred.

[0034] The substrate 10 may be composed of a single layer or multiple layers. When the substrate 10 is composed of multiple layers, at least one layer of the substrate 10 contains recycled resin. Furthermore, the substrate 10 may be a layer formed by co-extrusion 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-kind five-layer substrate made of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / recycled resin, a three-kind three-layer substrate made of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer, and a multilayer substrate made of petroleum-derived (natural) resin / recycled resin / petroleum-derived (natural) resin. In a multilayer substrate, the specific gravities of materials of the same type may differ depending on the function.

[0035] 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.

[0036] 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. If the substrate 10 is a uniaxially stretched film, the tearability and heat resistance of the laminate 100 can be improved. If the substrate 10 is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 100 can be improved.

[0037] When an adhesive layer is provided on the surface of the substrate 10, various pretreatments such as corona treatment, plasma treatment, ozone treatment, and flame treatment may be performed on the surface of the substrate 10 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.

[0038] 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 15 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.

[0039] (sealant layer) The sealant layer 30 is a resin layer and contains a resin, such as a polyolefin resin.

[0040] Examples of polyolefin resins include polyethylene and polypropylene.

[0041] 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.

[0042] 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.

[0043] 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. Examples of recycled resins include chemical recycled resins and material recycled resins, which can be used alone or in combination.

[0044] 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.

[0045] 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 preferred.

[0046] The sealant layer 30 preferably has a melting point lower than that of the 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 substrate 10. Furthermore, by heating the laminate 100, the substrate 10 and the sealant layer 30 can be easily separated, and material recycling of each of the substrate 10 and the sealant layer 30 can be easily performed.

[0047] The sealant 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 sealant layer 30 contains a light-blocking pigment, the sealant layer 30 can function as a light-blocking layer.

[0048] The sealant layer 30 may be constructed as a single layer or as multiple layers. When the sealant layer 30 is a single layer, the sealant layer 30 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 sealant layer 30 can be reduced, thereby preventing contaminants from being mixed into the contents due to the recycled resin. The recycled resin may be either chemically recycled or material recycled, but chemically recycled resin is preferred. This further prevents contaminants from being mixed into the contents due to the recycled resin's superior hygiene and quality. Furthermore, chemically recycled resins offer superior hygiene and quality, reducing the psychological resistance to contacting the recycled resin with the contents. When the recycled resin is chemically recycled, the sealant layer 30 may contain only recycled resin due to its superior hygiene and quality.

[0049] When the sealant layer 30 is configured with multiple layers, all of the layers may contain recycled resin, or only some of the layers may contain recycled resin and the remaining layers may contain non-recycled resin. Here, the layer containing the non-recycled resin is preferably located farthest from the substrate 10. The layer of the sealant layer 30 located farthest from the 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 and foreign matter such as gels and aggregates will migrate into the contents as they are heated during retort or boiling treatment of the packaging container. Therefore, the laminate 100 can be used safely to package contents such as food.

[0050] 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.

[0051] 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 sealant layer 30 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 substrate 10 can be easily suppressed when the laminate 100 is heat-sealed.

[0052] 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 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, 60 μm or less, or 50 μm or less.

[0053] (Second base material) The second base material 20 is a base material that reinforces the 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 contains a resin. 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 in the substrate 10. In this embodiment, the resin may or may not contain recycled resin. When the resin contains recycled resin, it may be composed of recycled resin and non-recycled resin. Examples of recycled resins include chemical recycled resins and material recycled resins. These can be used alone or in combination. From the viewpoint of stable supply, it is preferable to use material recycled polyethylene terephthalate as the recycled resin.

[0054] 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.

[0055] 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 preferred.

[0056] The second substrate 20 may be composed of a single layer or multiple layers. When the second substrate 20 is configured as a single layer, the second substrate 20 contains recycled resin as the resin. When the second substrate 20 is configured with multiple layers, all of the layers may contain recycled resin, or only some of the layers may contain non-recycled resin and the remaining layers 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 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.

[0057] The thickness of the second substrate 20 is not particularly limited and may be adjusted as appropriate. 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.

[0058] (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").

[0059] Examples of adhesives include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] (Printing layer) The printed layer 50 may be provided between layers, or may be provided on the outer side of the laminate 100 as shown in FIG. 1 . When the printed layer 50 is provided between layers, the printed layer 50 may be provided on the surface of the substrate 10 facing the sealant layer 30 (the inner surface). When the printed layer 50 is provided on the inner surface of the substrate 10, the printed layer 50 is protected by the substrate 10, preventing deterioration of the printed layer 50. When the printed layer 50 is provided on the outer surface of the substrate 10 and becomes 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 substrate 10 and the second substrate 20, or between the second substrate 20 and the sealant layer 30.

[0065] The print layer 50 is a layer that displays characters, pictures, etc., and can be formed using ink. 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.

[0066] 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 non-recycled ink, but recycled ink is preferred from the viewpoint of environmental impact.

[0067] 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.

[0068] (gas barrier layer) The laminate 100 may include a gas barrier layer 60 as shown in Fig. 1. The gas barrier layer 60 may be provided on at least one surface of the substrate 10. Furthermore, when the laminate 100 includes a second substrate 20, the gas barrier layer 60 may be provided on at least one surface of the second substrate 20 as shown in Fig. 1. 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.

[0069] 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.

[0070] 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.

[0071] (Laminate) (A) Percentage of recycled resin in the laminate In the laminate 100, the proportion A of recycled resin in the laminate 100 may be 5% or more. According to this laminate 100, the recycled resin is composed of multiple different types of recycled resin, making it possible to reduce the amount of each type of recycled resin. Therefore, only certain types of recycled resin tend to cause deterioration in the appearance, printability, and strength of the laminate 100, and even if the proportion of recycled resin in the laminate 100 is high, deterioration in appearance, printability, and strength can be suppressed when viewed as a whole. As a result, even if the proportion of recycled resin in the laminate 100 is high, at 5% or more, deterioration in appearance, printability, and strength due to the recycled resin can be suppressed. Furthermore, if the types of recycled resin contained in at least two of all recycled resin-containing layers are different from each other, even if the proportion of recycled resin in laminate 100 is high at 5% or more, the recycled resin is dispersed among the three recycled resin-containing layers, namely, substrate 10, second substrate 20, and sealant layer 30, and therefore the deterioration in appearance, printability, and strength caused by the recycled resin can be more effectively suppressed than when one type of recycled resin is concentrated in only one recycled resin-containing layer. 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). The proportion A may be 10% or more, 20% or more, or 30% or more. Proportion A may be 100%, 95%, 90%, 80%, 70%, or 60% or less.

[0072] (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 S of recycled resin in the laminate 100. The unit of the proportion B of recycled resin is 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.

[0073] (C) Chemically recycled resin The recycled resin contained in at least one recycled resin-containing layer among all the recycled resin-containing layers preferably contains a chemical recycled resin. Chemically recycled resin is a recycled resin produced by first breaking down discarded resin into smaller molecules through a process that involves gasifying, converting resin into oil, and then converting it into monomers through refined naphtha, or by depolymerizing it into monomers, depending on the material's characteristics. 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 made by cleaning, crushing, and then melting resin products such as recycled packaging materials. Furthermore, since chemically recycled resin is not subject to heat treatments such as melting after the recycling process, it is less susceptible to thermal degradation than material recycled resin. Therefore, even with a high proportion of recycled resin, the laminate 100 can be more effectively prevented from deteriorating in appearance, printability, and strength. For the same reason, it is particularly preferred that the recycled resin contained in all recycled resin-containing layers contains a chemical recycled resin.

[0074] (D) Material: Recycled polyethylene terephthalate It is preferable that the recycled resin contained in at least one of all the recycled resin-containing layers contains material recycled polyethylene terephthalate. Currently, collection and recycling schemes for material recycled polyethylene terephthalate have been established, and the supply is relatively stable. Therefore, if the recycled resin contained in at least one of all recycled resin-containing layers contains material recycled polyethylene terephthalate, a more stable supply of laminate 100 is possible. From the viewpoint of a stable supply of the laminate 100, it is preferable that the recycled resin contained in two or more recycled resin-containing layers contains material recycled polyethylene terephthalate. However, taking into consideration the appearance, printability, and strength, it is preferable that only the recycled resin contained in one recycled resin-containing layer contains material recycled polyethylene terephthalate.

[0075] Second Embodiment Next, a second embodiment of the packaging laminate according to the present disclosure will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view showing the second embodiment of the packaging laminate according to the present disclosure.

[0076] As shown in FIG. 2, the laminate 200 of this embodiment differs from the laminate 100 of the first embodiment in that it further includes a second sealant layer 40 as a resin layer that is arranged on the opposite side of the substrate 10 from the sealant layer 30. Here, the second sealant layer 40 is a resin layer, and the resin layer contains a resin.

[0077] (Second sealant layer) The second sealant layer 40 is a resin layer containing a resin, such as a polyolefin resin.

[0078] As the polyolefin resin, the same polyolefin resin as that used for the substrate 10 can be used. The resin may or may not contain recycled resin. When the resin contains recycled resin, it may be composed of recycled resin and non-recycled resin. Examples of recycled resins include chemical recycled resins and material recycled resins, which can be used alone or in combination.

[0079] 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. 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 preferred.

[0080] The second sealant layer 40 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 second sealant layer 40 contains a light-blocking pigment, the second sealant layer 40 can function as a light-blocking layer.

[0081] The second sealant layer 40 may be constructed as a single layer or as multiple layers. When the second sealant layer 40 is a single layer, the second sealant layer 40 may be composed solely of recycled resin or may be composed of recycled and non-recycled resins. However, a combination of recycled and non-recycled resins is preferred. In this case, the concentration of recycled resin in the second sealant layer 40 can be reduced, thereby preventing the contents from being contaminated with foreign matter resulting from the recycled resin. The recycled resin may be either a chemically recycled resin or a materially recycled resin, but a chemically recycled resin is preferred. This further prevents the contents from being contaminated with foreign matter resulting from the recycled resin. Furthermore, because chemically recycled resins are superior in terms of hygiene and quality, they can also reduce the psychological resistance to contacting the contents with recycled resins. When the recycled resin is a chemically recycled resin, the second sealant layer 40 may contain only recycled resin because of its superior hygiene and quality.

[0082] When the second sealant layer 40 is configured with multiple layers, all of the layers may contain recycled resin, or only some of the layers may contain recycled resin and the remaining layers may contain non-recycled resin. Here, the layer containing the non-recycled resin is preferably located farthest from the substrate 10. The layer of the second sealant layer 40 located farthest from the 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 200. If this layer contains a non-recycled resin, it is possible to further reduce the possibility that impurities and foreign matter such as gels and aggregates will migrate into the contents as they are heated during retort or boiling treatment of the packaging container. Therefore, the laminate 200 can be used safely to package contents such as food.

[0083] 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.

[0084] The second sealant layer 40 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 second sealant layer 40. Note that the second sealant layer 40 is not limited to a white sealant, and may be composed of a sealant of another color by containing a pigment other than the white pigment.

[0085] The thickness of the second sealant layer 40 is not particularly limited and may be adjusted appropriately depending on the application of the laminate 200. The thickness of the second sealant layer 40 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 sealant layer 40 may also be 100 μm or less, 80 μm or less, 60 μm or less, or 50 μm or less. The thickness of the second sealant layer 40 may be the same as or different from the thickness of the sealant layer 30. The material constituting the second sealant layer 40 may also be the same as or different from the material constituting the sealant layer 30.

[0086] Furthermore, when the laminate 200 includes the second sealant layer 40, the printed layer 50 may be provided on the opposite side of the second sealant layer 40 from the substrate 10. When the printed layer 50 is provided on the opposite side of the second sealant layer 40 from the substrate 10, providing the printed layer 50 on the surface of the second sealant layer 40 opposite the substrate 10 (outer surface) makes it possible to easily remove the printed layer 50 when recycling a package including the laminate 100 after disposal.

[0087] In the second embodiment, it is sufficient that at least two resin layers are made of recycled resin; for example, three resin layers may be made of recycled resin and one resin layer may be made of a layer that does not contain recycled resin, or two resin layers may be made of recycled resin and two resin layers may be made of a layer that does not contain recycled resin.

[0088] <<Packaging products>> Next, an embodiment of a packaging product according to another aspect of the present disclosure will be described with reference to Fig. 3. Fig. 3 is a cross-sectional view showing an embodiment of a packaging product according to another aspect of the present disclosure.

[0089] As shown in FIG. 3 , a 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 to face and bonding the peripheral edges. 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.

[0090] According to the packaged product 500, since the packaging bag 400 includes the laminate 100, even if the proportion of recycled resin is high, a stable supply is possible and deterioration in appearance, printability, and strength can be suppressed.

[0091] (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.

[0092] (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.

[0093] The packaging bag 400 may have a half-cut line, and may further have an easy-open processed part at both ends or one end of the half-cut line. Examples of the easy-open processed part include a group of scars, and a V-shaped, U-shaped, or I-shaped notch.

[0094] 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. 3), or may be bonded to each other by an adhesive.

[0095] (Manufacturing method of packaged products) Next, an example of a method for manufacturing a packaged product 500 using the laminate 100 will be described.

[0096] 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 the sealant layers 30 are bonded together. At this time, parts of the peripheral edges of the laminates are bonded in a U-shape to form bonded parts, and also parts that are not bonded (unbonded parts). In this way, a packaging bag having an opening formed by the unbonded parts is obtained.

[0097] 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.

[0098] 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. 3, the packaging bag 400 is formed using a pair of laminates 100. However, the packaging bag may be produced by folding one laminate 100 with the sealant layer 30 on the inside and bonding the overlapping peripheral edges together. Moreover, the laminate 100 may be replaced with the laminate 200 .

[0099] 3, the packaging bag 400 may be a standing pouch-shaped packaging bag, a two-sided bag, a three-sided bag, a four-sided bag, a palm-shaped bag, or a gusset bag. The packaging bag 400 may be provided with a stopper or a synthetic resin zipper that can be repeatedly sealed by fitting a strip-shaped protrusion and a strip-shaped groove.

[0100] In the first embodiment, the packaging container is a packaging bag, but the packaging container may be a tube container. In this case, the packaging container is formed using the laminate 200 having the second sealant layer 40.

[0101] Furthermore, in the first and second embodiments, the laminates 100 and 200 include the second substrate 20, but the second substrate 20 may be omitted. That is, the laminate 100 may include two resin layers, the substrate 10 and the sealant layer 30, and the laminate 200 may include three resin layers, the second sealant layer 40, the substrate 10, and the sealant layer 30. In the first and second embodiments, the laminate includes three or four resin layers, but the laminate of the present disclosure may include multiple resin layers, or may include five or more resin layers. When the laminate includes multiple resin layers, at least two of the resin layers must be recycled resin layers containing recycled resin. [Example]

[0102] The present disclosure will be explained in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0103] <Resin layers used in the base material, second base material, and sealant layer> (1) Nylon (Ny) film Chemical Ny Chemically recycled nylon film made from PCR resin using used packaging materials (thickness 15 μm) Material Ny Nylon film (thickness 15μm) recycled from used packaging materials Natural Ny Petroleum-derived nylon film (thickness 15 μm) [M / C]Ny Ny film (thickness 15 μm) made by mixing natural Ny, Material Cycle Ny (a PCR resin made from used packaging materials), and Chemical Recycle Ny (a PCR resin made from used packaging materials) in a 20:50:30 (mass ratio) mixture. (2) Polyethylene terephthalate (PET) film Chemical PET Chemically recycled PET film, a PCR resin made from used packaging materials (thickness 15 μm) Material: PET Material-recycled PET film, a PCR resin made from used packaging materials (thickness 12 μm) Natural PET Petroleum-derived PET film (thickness 12 μm) [M / C]PET PET film (thickness 15 μm) made from a 20:50:30 (mass ratio) mixture of natural PET, material recycled PET (a PCR resin made from used packaging materials), and chemically recycled PET (a PCR resin made from used packaging materials). (3) Polypropylene (PP) film Chemical PP Chemically recycled polypropylene film, a PCR resin made from used packaging materials (thickness 15 μm) Material: PP Polypropylene film recycled from used packaging materials (thickness 15 μm) Natural PP Petroleum-derived polypropylene film (thickness 15 μm) [M / C]PP PP film (thickness 15 μm) made from a 80:10:10 (mass ratio) mixture of natural PP, material recycled PP (a PCR resin made from used packaging materials), and chemically recycled PP (a PCR resin made from used packaging materials). (4) Polyethylene (PE) film Chemical PE Chemically recycled PE film (thickness 100 μm), a PCR resin made from used packaging materials Material: PE PE film (thickness 100 μm) recycled from used packaging materials Natural PE Petroleum-derived PE film (thickness 100 μm) [M / C]PE PE film (thickness 100 μm) made from a 80:10:10 (mass ratio) mixture of natural PE, material recycled PE (a PCR resin made from used packaging materials), and chemically recycled PE (a PCR resin made from used packaging materials). (5) Non-oriented polypropylene (CPP) film Chemical CPP Chemically recycled non-stretched PP film made from PCR resin using used packaging materials (Thickness 60 μm) Material CPP Material recycled non-stretched PP film made from used packaging materials and PCR resin (Thickness 60 μm) Natural CPP Petroleum-derived non-oriented PP film (thickness 60 μm)

[0104] Example 1 The above-mentioned chemical Ny was prepared as the substrate, the above-mentioned chemical PET was prepared as the second substrate, and the above-mentioned natural PE was prepared as the sealant layer. Then, a printing layer was formed on one surface of the substrate using aqueous flexographic ink, and then a dry laminating adhesive (urethane adhesive) was applied to the surface of the printing layer to form an adhesive layer 3 μm thick (dry film thickness), and a second substrate was bonded to the adhesive layer. After that, a dry laminating adhesive (urethane adhesive) was applied to the surface of the printing layer to form an adhesive layer 3 μm thick (dry film thickness), and a sealant layer was bonded to the adhesive layer. In this way, a laminate (substrate / printed layer / adhesive layer / second substrate / adhesive layer / sealant layer) was produced.

[0105] (Examples 2 to 315, Comparative Examples 1 to 87, and Reference Examples 1 to 31) Laminates (substrate / printed layer / adhesive layer / second substrate / adhesive layer / sealant layer) or laminates (substrate / printed layer / adhesive layer / sealant layer) were prepared in the same manner as in Example 1, except that the substrate, second substrate, and sealant layer were the films shown in Tables 1 to 54. In Tables 24, 25, 29, 30 to 33, and 43 to 45, "-" indicates that a second substrate was not used. When a second substrate was not used, an adhesive layer bonding the second substrate and sealant layer was also not used.

[0106] <Recycled resin percentage> For the laminates of the Examples, Comparative Examples, and Reference Examples prepared as described above, the proportion of recycled resin in the laminate was calculated according to the following formula. The results are shown in Tables 1 to 54. Recycled resin percentage (volume %) = 100 x total thickness of recycled resin-containing layers / total thickness of laminate However, when the recycled resin-containing layer is a layer containing recycled resin and petroleum-derived resin, when calculating the "total thickness of the recycled resin-containing layer," the value obtained by multiplying the thickness of the recycled resin-containing layer by the proportion (mass %) of recycled resin in the recycled resin-containing layer was used as the thickness value of the recycled resin-containing layer.

[0107] <Evaluation> The laminates of the Examples, Comparative Examples and Reference Examples prepared as described above were evaluated for feedability, elution of low molecular weight components, appearance, printability and strength as follows.

[0108] (1) Supplyability The supplyability was evaluated based on the following criteria. (standard) ◎…Even if more than 30 million laminated bags are required, a stable supply is expected. ○…If more than 1 million but less than 30 million bags of laminated bodies are secured, a stable supply is expected. ×: If more than 1 million bags of laminated bodies are required, it is expected that a stable supply will be difficult.

[0109] (2) Dissolution of low molecular weight components First, the elution of low molecular weight components of PP or PE in the sealant layer of the laminate was investigated by peeling the sealant layer from the laminate, immersing the sealant layer in a solvent, and measuring the amount of low molecular weight components in the solvent after immersion by gas chromatography. The elution of low molecular weight components was evaluated according to the following criteria. The results are shown in Tables 1 to 54. (standard) 0: Neither PP nor PE low molecular weight components were eluted. -1: Low molecular weight components of either PP or PE were eluted, but only in small amounts. -2... Either PP or PE low molecular weight components are clearly eluted

[0110] (3) Appearance The appearance of the laminate was evaluated as follows. Specifically, a sample measuring 1 m x 1 m was cut out from the laminate, and the sample was placed on a light table. Bright spots were visually inspected using a magnifying glass to identify ink voids. The bright spots were irregular in shape, and bright spots with a narrowest length of 0.4 mm or more were considered ink voids. The number of such bright spots was counted, and the total number of bright spots for the five samples was evaluated based on the following criteria. The results are shown in Tables 1 to 54. (standard) 0: 10 or fewer bright spots -1: Number of bright spots (ink voids) is 11 or more and 50 or less -2: Number of bright spots (ink voids) is between 51 and 100 -3: 101 or more bright spots (ink voids)

[0111] (4) Printability For the laminate, a barcode was printed on the substrate surface of the laminate using ink with an inkjet printer, and the barcode was read with a barcode reader, and the printability was evaluated based on the following criteria. The results are shown in Tables 1 to 54. 0...No ink repelling and barcodes can be read -1...There is some ink splatter, but the barcode can still be read. -2...Ink has been repellent and the barcode cannot be read.

[0112] (5) Strength For each of the Examples, Comparative Examples, and Reference Examples, 30 rectangular sheets measuring 400 mm x 300 mm were cut from the laminate, each sheet folded in half, and the edges extending from both ends of the folded portion were heat-sealed to prepare packaging bags. At this time, an opening for inserting the contents was formed in the packaging bag. The dimensions of the packaging bag were 200 mm x 300 mm. Next, each packaging bag was filled with 1200 mL of tap water, and the opening was sealed. In this way, 30 packaging products were prepared for each of the Examples, Comparative Examples, and Reference Examples. The 30 packages prepared as described above were stored for one day at 5°C, and then subjected to a drop test by dropping them from a height of 1 m to check whether the packages were broken. The number of broken packages was counted, and the strength was evaluated based on the following criteria. The results are shown in Tables 1 to 54. (standard) 0: The number of torn packaging products is 0 or less -1: The number of torn packages is between 1 and 3 -2: The number of torn packages is between 4 and 10 -3: The number of torn packaging products is more than 10

[0113] [Table 1]

[0114] [Table 2]

[0115] [Table 3]

[0116] Table 4

[0117] Table 5

[0118] Table 6

[0119] Table 7

[0120] Table 8

[0121] Table 9

[0122] Table 10

[0123] Table 11

[0124] Table 12

[0125] Table 13

[0126] Table 14

[0127] Table 15

[0128] Table 16

[0129] Table 17

[0130] Table 18

[0131] Table 19

[0132] Table 20

[0133] Table 21

[0134] Table 22

[0135] Table 23

[0136] Table 24

[0137] Table 25

[0138] Table 26

[0139] Table 27

[0140] Table 28

[0141] Table 29

[0142] Table 30

[0143] Table 31

[0144] Table 32

[0145] Table 33

[0146] Table 34

[0147] Table 35

[0148] Table 36

[0149] Table 37

[0150] Table 38

[0151] Table 39

[0152] Table 40

[0153] Table 41

[0154] Table 42

[0155] Table 43

[0156] Table 44

[0157] Table 45

[0158] [Table 46]

[0159] [Table 47]

[0160] [Table 48]

[0161] [Table 49]

[0162] [Table 50]

[0163] [Table 51]

[0164] [Table 52]

[0165] [Table 53]

[0166] [Table 54]

[0167] From the results shown in Tables 1 to 54, in all of the laminates of Examples 1 to 315, even when the proportion of recycled resin was increased, the deterioration in appearance, printability, and strength was suppressed, and the supplyability was more stable than in Comparative Examples 1 to 87.

[0168] From the above, it has been confirmed that the laminate for packaging materials of the present disclosure can suppress deterioration in appearance, printability, and strength while enabling stable supply even when the proportion of recycled resin is high. [Explanation of symbols]

[0169] 10...substrate (resin layer), 20...second substrate (resin layer), 30...sealant layer (resin layer), 40...second sealant layer (resin layer), 60...gas barrier layer, 100, 200...laminate, 400...packaging bag (packaging container), 500...packaged product, C...contents.

Claims

1. A packaging laminate comprising a plurality of resin layers, The laminate for packaging material comprises a plurality of different types of recycled resins.

2. the plurality of resin layers include at least two recycled resin-containing layers containing the recycled resin; 2. The packaging laminate according to claim 1, wherein types of the recycled resin contained in at least two of all the recycled resin-containing layers are different from each other.

3. 2. The packaging laminate according to claim 1, wherein the recycled resin accounts for 5% or more of the total amount of the packaging laminate.

4. 4. The packaging laminate according to claim 3, wherein the recycled resin accounts for 10% or more of the total amount of the packaging laminate.

5. The packaging laminate according to claim 1 , wherein the plurality of resin layers is three resin layers.

6. The packaging laminate according to claim 1 , wherein the recycled resin contained in at least one of all of the recycled resin-containing layers includes a chemical recycled resin.

7. The packaging laminate according to claim 1 , wherein the recycled resin contained in at least one of all of the recycled resin-containing layers comprises material recycled polyethylene terephthalate.

8. 2. The packaging laminate according to claim 1, wherein the proportion of the recycled resin in the recycled resin-containing layer is 10 to 90% based on the total amount of the recycled resin in the laminate.

9. A packaging container obtained by using the packaging laminate according to any one of claims 1 to 8.

10. The packaging container according to claim 9; and a content contained within the packaging container.

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