Laminate tube container and packaging article

Abstract

To provide a laminated tube container which can be stably supplied while reducing an environmental load, and a packaged article.SOLUTION: A laminated tube container comprising a container body and a cap, wherein the container body has a body portion obtained using a laminate comprising a first sealant layer, a substrate, and a second sealant layer in this order, and a cap attachment portion provided on the body portion, the cap attachment portion has a mouth, and the cap is attached to the mouth, wherein the cap is made of a polyolefin resin molded body containing a first recycled resin, the container body contains a second recycled resin, and the second recycled resin is not the same as the first recycled resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to laminated tube containers and packaging articles. [Background technology]

[0002] Laminated tube containers are known as packaging containers suitable for packaging toothpaste and the like. For example, the laminated tube container described in Patent Document 1 below is known as such a laminated tube container. Patent Document 1 below describes a laminated tube container that includes a container body and a cap, the container body having a cylindrical body portion with a closed lower end, a truncated cone-shaped shoulder portion connected to the upper end of the cylindrical body portion, and a mouth portion connected to the shoulder portion, and the cap is attached to the mouth portion. In this laminated tube container, the shoulder portion and the mouth portion are made of a polymer having a density of 0.880 to 0.925 g / cm 3 polymerized using a single-site catalyst. 3 A laminated tube container is disclosed that is molded using the ethylene-α-olefin copolymer as a molding material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-249966 Summary of the Invention [Problem to be solved by the invention]

[0004] Recently, 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 resin as the resin for laminated tube containers. In this case, it is desirable to use recycled resin for the cap of the laminated tube container, which does not come into direct contact with the contents.

[0005] However, simply using recycled resin for the cap makes it difficult to increase the proportion of recycled resin used, and the environmental impact cannot be sufficiently reduced. While it is possible to use recycled resin not only for the cap but also for the container body, if the recycled resin used for the cap is the same as the recycled resin used for the container body, it becomes necessary to secure a large amount of a single recycled resin. In this case, it is not necessarily possible to stably secure such recycled resin on the market, and there is a risk that it will be difficult to stably supply laminated tube containers.

[0006] An object of the present disclosure is to provide a laminated tube container and a packaged article that can be supplied stably while reducing the environmental impact. [Means for solving the problem]

[0007] One aspect of the present disclosure provides a laminated tube container comprising a container body and a cap, wherein the container body has a body obtained using a laminate comprising a first sealant layer, a substrate, and a second sealant layer in this order, and a cap attachment portion provided on the body, the cap attachment portion having a mouth, and the cap attached to the mouth, wherein the cap is made of a polyolefin resin molded product containing a first recycled resin, the container body contains a second recycled resin, and the second recycled resin is not the same as the first recycled resin. According to the laminated tube container, the first recycled resin contained in the polyolefin resin molded body constituting the cap is not the same as the second recycled resin contained in the container body. Therefore, when the proportion of recycled resin in the laminated tube container is constant, it is possible to reduce the amount of the same recycled resin compared to when the first recycled resin and the second recycled resin are the same. This makes it easier to ensure a stable supply of the first recycled resin and the second recycled resin. Furthermore, according to the laminated tube container, recycled resin is contained not only in the cap but also in the container body, so the proportion of recycled resin in the laminated tube container can be increased. Therefore, the laminated tube container of the present disclosure enables a stable supply while reducing the environmental impact.

[0008] In another aspect, the present disclosure provides "the laminated tube container according to [1], wherein the first recycled resin includes a chemical recycled resin." The cap is made of a polyolefin resin molded product containing a first recycled resin, which includes a chemically recycled resin. Chemically recycled resin is a recycled resin produced by first depolymerizing the resin through a process appropriate for the material's characteristics, such as monomerization via oil-refined naphtha or depolymerization, followed by polymerization. Therefore, compared to material recycled resin, which is a resin made by cleaning and crushing used packaging and other resin products and then melting them under heat to recycle them into raw materials, chemically recycled resin is less likely to be contaminated with impurities or foreign matter such as gels or aggregates. This reduces the appearance of foreign matter such as gels or aggregates on the surface of the cap. Furthermore, because the first recycled resin includes a chemically recycled resin, the cap is less likely to yellow or turn dark. This allows the appearance of laminated tube containers to be improved, even when the cap contains recycled resin. Furthermore, unlike material recycled resins, chemically recycled resins are not subject to heat treatments such as melting after the recycling process, making them less susceptible to thermal degradation and less likely to emit odorous components. Furthermore, because the cap is made of a polyolefin resin molded body containing a first recycled resin, the first recycled resin contains a chemically recycled resin. This prevents contamination of the material recycled resin during cap molding, preventing impediments to kneading in the injection screw and reducing the likelihood of carbonization in the cap. Furthermore, unmelted material is prevented from being present in the cap's fitting portion, preventing poor fitting and reducing leakage from the cap. Furthermore, the material recycled resin is not contaminated during cap molding, preventing contamination by large sink marks originating from the core of the contaminant during injection molding. Therefore, the quality of laminated tube containers can be improved even when the cap contains a first recycled resin.

[0009] In another aspect, the present disclosure provides "(3) the laminated tube container according to (1) above, wherein the first recycled resin includes a material recycled resin." When contents are placed in a laminated tube container, the contents rarely come into contact with the cap, and even if they do, it is only for a very short time. Therefore, even if the first recycled resin contains material recycled resin, foreign matter originating from the material recycled resin is prevented from being mixed into the contents. Furthermore, if the first recycled resin contains material recycled resin, costs and energy consumption in the recycling process can be reduced.

[0010] As another aspect, the present disclosure provides a laminated tube container according to any one of [1] to [3], wherein the base material of the container body contains the second recycled resin, and the second recycled resin contains material recycled polyethylene terephthalate. Currently, collection and recycling schemes for material recycled polyethylene terephthalate have been established, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of the base material and therefore the container body will be possible. In addition, because the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate.

[0011] In another aspect, the present disclosure provides a laminated tube container according to any one of [1] to [4], wherein the container body contains the second recycled resin, and the second recycled resin contains a chemical recycled resin. When contents are placed in a laminated tube container, the contents are in contact with the container for a long period of time. When the second recycled resin contains chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the incorporation of foreign matter into the contents is suppressed.

[0012] In another aspect, the present disclosure provides "a laminated tube container according to any one of [1] to [5], wherein, in the recycled resins in the laminated tube container, the proportion of the first recycled resin is 10 to 90% and the proportion of the second recycled resin is 90 to 10%." Here, the proportions are expressed in volume % or mass %. According to this laminated tube container, the recycled resin is dispersed in a balanced manner in the cap and the container body, making it possible to more stably supply laminated tube containers.

[0013] In another aspect, the present disclosure provides a "packaging article comprising the laminated tube container according to any one of [7], [1] to [6], and contents contained in the laminated tube container." The packaged article includes a laminated tube container, which enables stable supply while reducing the environmental impact. Therefore, the packaged article enables stable supply while reducing the environmental impact. [Effects of the Invention]

[0014] According to the present disclosure, a laminated tube container and a packaged article are provided that can be supplied stably while reducing the environmental burden. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing one embodiment of a packaging article according to the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view showing one embodiment of a laminate that forms the body of the laminate tube container of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the packaging article of the present disclosure will be described in detail. In the drawings, the same or corresponding parts are designated by the same reference numerals, and duplicated explanations will be omitted. Fig. 1 is a cross-sectional view showing one embodiment of the packaging article of the present disclosure, and Fig. 2 is a cross-sectional view showing one embodiment of a laminate that forms the body of the laminated tube container of Fig. 1.

[0017] The packaged article 500 shown in FIG. 1 includes a laminated tube container 400 and a content C contained in the laminated tube container 400. The laminated tube container 400 includes a container body 330 and a cap 320. The container body 330 includes a body 300 and a cap attachment part 310 provided on the body 300. The cap attachment part 310 has a mouth 311, and the cap 320 is attached to the mouth 311. The body 300 is obtained using the laminate 100. The cap 320 is made of a polyolefin resin molded body containing a first recycled resin, and the container body 330 contains a second recycled resin. As shown in FIG. 2, the laminate 100 includes a first sealant layer 40, a substrate 10, and a second sealant layer 30. The laminate 100 may further include a second substrate 20 between the substrate 10 and the second sealant layer 30 (see FIG. 2). The laminate 100 may include a second substrate 20 between the first sealant layer 40 and the substrate 10, or may include a second substrate 20 between the first sealant layer 40 and the substrate 10, and between the substrate 10 and the second sealant layer 30. The laminate 100 may further include a printed layer 50 .

[0018] In the laminated tube container 400, the first recycled resin contained in the polyolefin resin molded body constituting the cap 320 is not the same as the second recycled resin contained in the container body 330. Therefore, when the proportion of recycled resin in the laminated tube container 400 is constant, the amount of the same recycled resin can be reduced compared to when the first recycled resin and the second recycled resin are the same. This makes it easier to ensure a stable supply of the first recycled resin and the second recycled resin. Furthermore, in the laminated tube container 400, recycled resin is contained not only in the cap 320 but also in the container body 330, thereby increasing the proportion of recycled resin in the laminated tube container 400. Therefore, the laminated tube container 400 enables stable supply while reducing environmental impact. Therefore, the packaged item 500 including the laminated tube container 400 enables stable supply while reducing environmental impact.

[0019] (A) Percentage of recycled resin In the laminated tube container 400, the proportion of recycled resin is preferably 10% or more. In addition, if the cap 320, the substrate 10, the second substrate 20, the first sealant layer 40 or the second sealant layer 30 is a mixture of chemically recycled resin and non-recycled resin such as petroleum-derived resin or biomass-derived resin, the mass of the recycled resin in each of the cap 320, the substrate 10, the second substrate 20, the first sealant layer 40 or the second sealant layer 30 is calculated according to the mass ratio of the recycled resin to the non-recycled resin, and the proportion (%) of recycled resin in the laminated tube container 400 is calculated.

[0020] From the viewpoint of further reducing the environmental impact, the proportion A of recycled resin in the laminated tube container 400 is preferably 20% or more, more preferably 25% or more, even more preferably 30% or more, and particularly preferably 40% or more. A may be 100%, but from the viewpoint of stable supply of the laminated tube container 400, it is preferably 90% or less, more preferably 80% or less, even more preferably 70% or less, and particularly preferably 60% or less.

[0021] In the recycled resins in the laminated tube container 400, the proportion A1 of the first recycled resin and the proportion A2 of the second recycled resin are not particularly limited, but it is preferable that the proportion A1 of the first recycled resin is 10 to 90% and the proportion A2 of the second recycled resin is 90 to 10%. According to this laminated tube container 400, the recycled resin is dispersed in a well-balanced manner in each of the cap 320 and the container body 330, so that the laminated tube container 400 can be supplied more stably. Here, A1 is preferably 20 to 80%, more preferably 30 to 70%, and particularly preferably 40 to 60%. A2 is calculated using the following formula: A2=100-A1

[0022] In the recycled resin contained in the laminated tube container 400, the proportion A2 of the second recycled resin may be smaller than the proportion A1 of the first recycled resin or may be equal to or larger than A1, but is preferably smaller than A1. When the content C is contained in the laminated tube container 400, the content C comes into contact with the container body 330 for a longer period of time than with the cap 320. Therefore, among the recycled resins contained in the laminated tube container 400, the proportion A2 of the second recycled resin contained in the packaging container 300 is smaller than the proportion A1 of the first recycled resin contained in the cap 320, thereby increasing the proportion A of recycled resin in the laminated tube container 400 and further suppressing contamination of the content C with foreign matter originating from the recycled resin. Furthermore, when the cap 320 is formed by injection molding and the laminate 100 is formed by film formation, replacing non-recycled resin with recycled resin becomes easier when the proportion A1 of the first recycled resin is larger than the proportion A2 of the second recycled resin. Here, A1-A2 should be greater than 0%, but is preferably 5% or greater, more preferably 10% or greater, and particularly preferably 20% or greater.

[0023] The recycled resin may be post-consumer recycled resin (PCR), post-industrial recycled resin (PIR), or a mixture thereof, but preferably contains PCR. PCR can be secured in large quantities on the market, so if the recycled resin is PCR, it will be possible to more stably supply the laminated tube container 400.

[0024] The container body 330, the cap 320 and the contents C will be described in detail below.

[0025] <<<Container body>>> The container body 330 includes a body portion 300 and a cap attachment portion 310 provided on the body portion 300, and the cap attachment portion 310 has a mouth portion 311 to which the cap 320 is attached. The container body 330 contains a second recycled resin. The second recycled resin may be contained in at least one of the body portion 300 and the cap attachment portion 310. When the second recycled resin is contained in the body portion 300, the second recycled resin may be contained in at least one of the first sealant layer 40, the substrate 10, the second substrate 20, and the second sealant layer 30. <<Body>> The body portion 300 is obtained using a laminate 100 including a first sealant layer 40, a substrate 10, and a second sealant layer 30. Specifically, the body portion 300 is obtained by rolling the laminate 100, for example, with the first sealant layer 40 facing outward, forming a first sealed portion 301 with parts of the laminate 100 overlapping each other to form a cylindrical body, and heat-sealing one end of the cylindrical body to form a second sealed portion 302.

[0026] <Base material> The substrate 10 contains a resin. Examples of such resins include polyolefin resins, polyester resins, and polyamide resins. Among them, polyester resins are preferred from the viewpoint of mechanical strength.

[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.

[0029] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[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.

[0031] 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.

[0032] The resin may be a non-recycled resin, a recycled resin (second recycled resin), or a mixture thereof.

[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 preferable.

[0034] When the resin contains a recycled resin (second recycled resin), the recycled resin (second recycled resin) is not the same as the first recycled resin in the cap 320. When the resin contains a recycled resin (second recycled resin) and at least one of the first sealant layer 40, the second substrate 20, the second sealant layer 30, and the cap attachment portion 310 contains a recycled resin (second recycled resin), the recycled resin in the substrate 10 may or may not be the same as the recycled resin contained in at least one of the first sealant layer 40, the second substrate 20, and the second sealant layer 30, but from the viewpoint of a stable supply of the laminated tube container 400, it is preferable that they are different. When the resin contains a recycled resin (second recycled resin), the substrate 10 does not come into direct contact with the contents C, and therefore the recycled resin (second recycled resin) may be a material recycled resin or a chemical recycled resin. When the contents C are contained in the laminated tube container 400, the contents C come into contact with the container body 330 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and foreign matter is prevented from being mixed into the contents C. Furthermore, when the recycled resin is a material recycled resin, costs and energy consumption in the recycling process can be reduced. The recycled resin may include a material recycled resin, but the material recycled resin is preferably material recycled polyethylene terephthalate. Currently, collection and recycling schemes have been established for material recycled polyethylene terephthalate, resulting in a relatively stable supply. Therefore, if the second recycled resin among all recycled resins contains material recycled polyethylene terephthalate, a more stable supply of laminate 100 becomes possible. Furthermore, since the recycling process for material recycled polyethylene terephthalate is well established, it is more hygienic than material recycled resins other than material recycled polyethylene terephthalate. However, from the viewpoint of hygiene, chemically recycled polyethylene terephthalate is more preferable than material recycled polyethylene terephthalate.

[0035] The substrate 10 may be composed of a single layer or a laminate of multiple layers. When the substrate 10 is composed of a laminate of multiple layers and contains a recycled resin (second recycled resin), it is sufficient that at least one layer of the substrate 10 contains the 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-type five-layer substrate made of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer / adhesive resin / recycled resin, a three-type three-layer substrate made of recycled resin / adhesive resin / ethylene-vinyl alcohol copolymer, and a multi-type multilayer substrate made of petroleum-derived (natural) resin / recycled resin / petroleum-derived (natural) resin, etc. In the multilayer substrate 10, materials of the same type may have different specific gravities depending on their functions.

[0036] 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.

[0037] 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. When the substrate 10 is a uniaxially stretched film, the tear resistance and heat resistance of the laminate 100 can be improved. When the substrate 10 is a biaxially stretched film, the mechanical strength and dimensional stability of the laminate 100 can be improved.

[0038] 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 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.

[0039] 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 obtaining excellent heat resistance, impact resistance, and gas barrier properties, the thickness of the substrate 10 is preferably 15 μm or more, 20 μm or more, 25 μm or more, 30 μm or more, or 40 μm or more. Furthermore, from the viewpoint of reducing materials to reduce environmental impact, the thickness of the substrate 10 is preferably 60 μm or less, or 50 μm or less.

[0040] <First sealant layer> The first sealant layer 40 is a layer that is bonded to the second sealant layer 30 when manufacturing the cylindrical body portion 300 by overlapping parts of the laminate 100 and applying heat and pressure, and contains a resin.

[0041] Examples of such resins include polyolefin resins and polyester resins. Polyolefin resins are suitable for use in terms of sealing suitability, etc., while polyester resins are preferred in terms of low content adsorption and flavor barrier properties.

[0042] Examples of polyolefin resins include polyethylene and polypropylene, with polyethylene being preferred.

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

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

[0045] 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.

[0046] The resin may be a non-recycled resin, a recycled resin (second recycled resin), or a mixture thereof.

[0047] 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.

[0048] When the resin contains a recycled resin (second recycled resin), this recycled resin is not the same as the first recycled resin in the cap 320. When the resin contains a recycled resin (second recycled resin) and at least one of the substrate 10, the second substrate 20, the second sealant layer 30, and the cap attachment portion 310 contains a recycled resin (second recycled resin), the recycled resin in the first sealant layer 40 may or may not be the same as the recycled resin contained in at least one of the substrate 10, the second substrate 20, and the second sealant layer 30, but from the viewpoint of a stable supply of the laminated tube container 400, it is preferable that they are different. When the resin contains a recycled resin (second recycled resin), the recycled resin may be a material recycled resin or a chemical recycled resin. When the contents C are contained in the laminated tube container 400, the contents C are in contact with the container body 330 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the contamination of the contents C with foreign matter is suppressed. Furthermore, when the recycled resin is a material recycled resin, the cost and the amount of energy used in the recycling process can be reduced.

[0049] The first sealant layer 40 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 first sealant layer 40 while suppressing melting of the substrate 10. Furthermore, by heating the laminate 100, the substrate 10 and the first sealant layer 40 or the second sealant layer 30 can be easily separated, and material recycling can be easily performed for each of the substrate 10 and the first sealant layer 40 or the second sealant layer 30.

[0050] The first 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 first sealant layer 40 contains a light-blocking pigment, the first sealant layer 40 can function as a light-blocking layer.

[0051] The first sealant layer 40 may be a single layer or a laminate of multiple layers. When the first sealant layer 40 is composed of a single layer, the first sealant layer 40 may be a recycled resin film or a non-recycled resin film, but when the first sealant layer 40 is disposed inside the body portion 300, a non-recycled resin film is preferable from the viewpoint of preventing foreign matter resulting from the recycled resin from being mixed into the contents C. As the recycled resin film, a film containing a chemically recycled resin as the recycled resin is preferable because it is excellent in terms of hygiene and quality. When the first sealant layer 40 has three layers, the 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 be made of a non-recycled resin film, and the intermediate layer may be made of a recycled resin film. The first 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. The first sealant layer 40 is not limited to a white sealant, and may contain a pigment other than the white pigment to form a sealant layer of a different color.

[0052] The thickness of the first sealant layer 40 is not particularly limited and may be adjusted appropriately depending on the application of the laminate 100. The thickness of the first 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 first sealant layer 40 may also be 250 μm or less, 200 μm or less, 150 μm or less, 100 μm or less, 80 μm or less, 70 μm or less, or 60 μm or less.

[0053] <Second sealant layer> The second sealant layer 30 is a layer that is bonded to the first sealant layer 40 when parts of the laminate 100 are overlapped and heated and pressurized to produce the cylindrical body portion 300, and contains a resin.

[0054] Examples of such resins include polyolefin resins and polyester resins. Polyolefin resins are suitable for use in terms of sealing suitability, etc., while polyester resins are preferred in terms of low content adsorption and flavor barrier properties.

[0055] Examples of polyolefin resins include polyethylene and polypropylene, with polyethylene being preferred.

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

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

[0058] 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.

[0059] The resin may be a non-recycled resin, a recycled resin (second recycled resin), or a mixture thereof.

[0060] 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.

[0061] When the resin contains a recycled resin (second recycled resin), this recycled resin is not the same as the first recycled resin in the cap 320. When the resin contains a recycled resin (second recycled resin) and at least one of the substrate 10, the second substrate 20, the first sealant layer 40, and the cap attachment portion 310 contains a recycled resin (second recycled resin), the recycled resin in the second sealant layer 30 may or may not be the same as the recycled resin contained in at least one of the substrate 10, the second substrate 20, and the first sealant layer 40, but from the viewpoint of a stable supply of the laminated tube container 400, it is preferable that they are different.

[0062] When the resin contains a recycled resin (second recycled resin), the recycled resin may be a material recycled resin or a chemical recycled resin. When the contents C are contained in the laminated tube container 400, the contents C are in contact with the container body 330 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the contamination of the contents C with foreign matter is suppressed. Furthermore, when the recycled resin is a material recycled resin, the cost and the amount of energy used in the recycling process can be reduced.

[0063] The second 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 second sealant layer 30 while suppressing melting of the substrate 10. Furthermore, by heating the laminate 100, the substrate 10 and the second sealant layer 30 can be easily separated, and material recycling of each of the substrate 10 and the second sealant layer 30 can be easily performed.

[0064] The second 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 second sealant layer 30 contains a light-blocking pigment, the second sealant layer 30 can function as a light-blocking layer.

[0065] The material that makes up the second sealant layer 30 may be the same as or different from the material that makes up the first sealant layer 40 .

[0066] The second sealant layer 30 may be a single layer or a laminate of multiple layers. When the second sealant layer 30 is composed of a single layer, the second sealant layer 30 may be a recycled resin film or a non-recycled resin film, but when the second sealant layer 30 is placed inside the body portion 300, it is preferably a non-recycled resin film from the viewpoint of preventing foreign matter resulting from the recycled resin from being mixed into the contents C. As the recycled resin film, a film containing a chemically recycled resin as the recycled resin is preferred because it is excellent in terms of hygiene and quality. When the second sealant layer 30 has three layers, the 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 be made of a non-recycled resin film, and the intermediate layer may be made of a recycled resin film. The second 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. The second sealant layer 30 is not limited to a white sealant, and may contain a pigment other than the white pigment to form a sealant layer of a different color.

[0067] The thickness of the second sealant layer 30 is not particularly limited and may be adjusted appropriately depending on the application of the laminate 100. The thickness of the second 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 second sealant layer 30 may also be 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.

[0068] <Second base material> The second substrate 20 is a substrate that reinforces the substrate 10, and can further improve the strength of the laminate 100. The second substrate 20 may be provided on the inner side (the second sealant layer 30 side) of the substrate 10, as shown in Fig. 2, or on the outer side (the side opposite to the second sealant layer 30). The second substrate 20 may also be provided on both sides of the substrate 10. The second substrate 20 includes a resin. Examples of such resins include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin resins such as polyethylene, polypropylene, and cyclic olefin copolymers COC and COP, polyamide resins such as polystyrene and nylon 66, and engineering plastics such as polycarbonate resin, polyacrylonitrile resin, and polyimide resin. Resins having mechanical strength and dimensional stability are preferred. The resin is processed into a film and used as a film substrate, which may be an unstretched film or a stretched film.

[0069] The second substrate 20 may be composed of a single layer or a laminate of multiple layers. When the second substrate 20 is configured as a single layer, the second substrate 20 may be a recycled resin film, or may be a non-recycled resin film such as a petroleum-derived resin or a biomass-derived resin. When the second substrate 20 is composed of a laminate of multiple layers, all layers may be recycled resin films, all layers may be non-recycled resin films, or some layers may be non-recycled resin films and the rest may be recycled resin films. 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. The first and second outer layers may be made of non-recycled resin films, and the intermediate layer may be made of recycled resin film. In this case, the possibility that impurities or foreign matter such as gels or aggregates will migrate from the second substrate 20 through the second sealant layer 30 to the contents due to heating during retort or boiling of the laminated tube container can be further reduced. Therefore, the laminate 100 can be used safely to package contents such as food. The second substrate 20 may be a co-extruded resin film of polypropylene (PP) and ethylene vinyl alcohol resin (EVOH) (PP / EVOH), a co-extruded resin film of polyethylene and EVOH (PE / EVOH), or a co-extruded resin film of multiple layers and EVOH. Here, an example of the multiple layers is a three-layer polypropylene film (PP / PP / PP).

[0070] The thickness of the second substrate 20 is not particularly limited and is adjusted appropriately depending on the application of the laminated tube container 400. 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, 70 μm or less, or 60 μm or less.

[0071] <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").

[0072] Examples of adhesives include known adhesives such as urethane adhesives, polyester adhesives, polyamide adhesives, epoxy adhesives, and isocyanate adhesives.

[0073] 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.

[0074] 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.

[0075] 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 and fused by heat, and examples thereof include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, methylpentene polymer, and acid-modified polyolefin resins obtained by modifying polyolefin resins such as polyethylene or polypropylene with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, and the like.

[0076] 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.

[0077] <Print layer> The print layer 50 is a layer that displays characters, pictures, etc., and can be formed using ink. The printed layer 50 is provided between layers. When the printed layer 50 is provided between layers, the printed layer 50 may be provided between the first substrate 10 and the first sealant layer 40, or may be provided between the first substrate 10 and the second sealant layer 30. When the printed layer 50 is provided between the first substrate 10 and the first sealant layer 40 or the second sealant layer 30, the printed layer 50 is protected by the first substrate 10 and the first sealant layer 40 or the second sealant layer 30, thereby preventing deterioration of the printed layer 50. Furthermore, when the laminate 100 includes a second substrate 20, 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 may be provided between the second substrate 20 and the second sealant layer 30.

[0078] 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.

[0079] 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.

[0080] 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 laminated tube container 400 including the laminate 100 after disposal. Specifically, an example of an easily recyclable ink is "SunSpectro Solvawash" manufactured by DIC Corporation.

[0081] <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.

[0082] 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.

[0083] 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.

[0084] In the first sealed portion 301 of the body portion 300, the second sealant layer 30 and the first sealant layer 40 of the laminate 100 may be directly bonded by heat sealing, or may be bonded to each other with an adhesive.

[0085] <<Cap mounting part>> The cap attachment portion 310 includes a cylindrical mouth portion 311 through which the contents C pass, and a shoulder portion 312 connecting the mouth portion 311 and the body portion 300. The outer circumferential surface of the mouth portion 311 may have a thread portion (for example, a spiral convex portion) for attaching the cap 320. The cap attachment portion 310 is made of a polyolefin resin molded body containing polyolefin resin.

[0086] Examples of polyolefin resins include polyethylene and polypropylene, with polyethylene being preferred.

[0087] 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.

[0088] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0089] The polyolefin resin may be a non-recycled resin, a recycled resin (second recycled resin), or a mixture thereof.

[0090] 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.

[0091] When the polyolefin resin contains a recycled resin (second recycled resin), this recycled resin is not the same as the first recycled resin in the cap 320. When the polyolefin resin contains a recycled resin (second recycled resin) and at least one of the second sealant layer 30, the substrate 10, the second substrate 20, and the first sealant layer 40 contains a recycled resin (second recycled resin), the recycled resin in the cap attachment portion 310 may or may not be the same as the recycled resin contained in at least one of the second sealant layer 30, the substrate 10, the second substrate 20, and the first sealant layer 40, but from the viewpoint of a stable supply of the laminated tube container 400, it is preferable that they are different.

[0092] When the polyolefin resin contains a recycled resin (second recycled resin), the recycled resin may be a material recycled resin or a chemical recycled resin. When the content C is contained in the laminated tube container 400, the content C comes into contact with the container body 330 for a long period of time. However, when the second recycled resin contains a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin, and the contamination of the content C with foreign matter is suppressed. Furthermore, when the recycled resin is a material recycled resin, the cost and the amount of energy used in the recycling process can be reduced.

[0093] The proportion of recycled resin in the cap attachment portion 310 is not particularly limited, but is, for example, 10% or more, 20% or more, 30% or more, 40% or more, or 50% or more. The percentage of recycled resin in the cap attachment portion 310 may be 100% or less, 80% or less, or 60% or less. The above percentages are expressed in units of volume % or mass %.

[0094] <<<Cap>>> Cap 320 is attached to mouth 312 of cap attachment part 310. When mouth 311 has a spiral convex portion on its outer circumferential surface, cap 320 may have a threaded portion (e.g., a spiral concave portion) on its inner circumferential surface. Furthermore, cap 320 may further have an inner ring on its bottom surface to prevent the contents from leaking from mouth 311. The cap 320 is made of a polyolefin resin molded body containing a polyolefin resin, and the polyolefin resin contains a first recycled resin.

[0095] Examples of polyolefin resins include polyethylene and polypropylene, with polyethylene being preferred.

[0096] 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.

[0097] Polypropylene is a resin containing propylene as a structural unit, but may not contain ethylene as a structural unit, and may be a copolymer of propylene alone or with ethylene or various α-olefins. Examples of polypropylene include homopolypropylene, block polypropylene, and random polypropylene.

[0098] The polyolefin resin may contain the first recycled resin, and may be composed of a recycled resin (first recycled resin), or may be a mixture of a recycled resin and a non-recycled resin.

[0099] 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.

[0100] When the resin contains a recycled resin (first recycled resin), the recycled resin may be a material recycled resin or a chemical recycled resin. When the recycled resin is a chemical recycled resin, the chemical recycled resin is more hygienic than the material recycled resin. Furthermore, when the recycled resin is a material recycled resin, the cost and the amount of energy used in the recycling process can be reduced. The proportion of recycled resin in cap 320 is not particularly limited, but may be, for example, 10% or more, 20% or more, 30% or more, 40% or more, or 50% or more. The percentage of recycled resin in the cap 320 may be 100% or less, 80% or less, or 60% or less. The above percentages are expressed in units of volume % or mass %.

[0101] <<<Contents>>> The content C is not particularly limited and may be appropriately selected depending on the application of the laminated tube container 400. The content C is not particularly limited, and examples of the content C include toothpaste, cosmetics, glue, mustard greens, wasabi paste, cream, butter, margarine, and other seasonings, paints, ointments, and medicines.

[0102] <Manufacturing method of packaging items> Next, an example of a method for manufacturing a packaged article 500 using the laminate 100 will be described.

[0103] First, the body portion laminate 100 is prepared. Then, the body portion laminate 100 is rolled up, for example, with the first sealant layer 40 on the outside, and parts are overlapped. The first sealant layer 40 and the second sealant layer 30 are heat-sealed to form a first sealed portion 301, forming a cylindrical body. One end of the cylindrical body is then heat-sealed to form a second sealed portion 302, thereby producing the body portion 300. Next, the material constituting the cap attachment portion 310 is melted and molded to obtain the molten cap attachment portion 310. At this time, the cap attachment portion 310 is molded to have a mouth portion 311 and a shoulder portion 312, and a thread portion (e.g., a spiral convex portion) for attaching the cap 320 is formed on the outer periphery of the mouth portion 311. Then, the end of the body portion 300 is brought into contact with the shoulder portion 312 of the molten cap attachment portion 310, and the cap attachment portion 310 and the body portion 300 are joined and integrated to obtain the container body 330.

[0104] Meanwhile, the material constituting cap 320 is melted and molded to prepare cap 320. At this time, if a threaded portion (e.g., a spiral convex portion) is formed on the outer periphery of mouth portion 312, cap 320 may have a threaded portion (e.g., a spiral concave portion) formed on the inside thereof that engages with the threaded portion (e.g., the spiral convex portion) of cap attachment portion 310. Then, the contents C are filled into the container body 330 through the opening 311. Thereafter, the cap 320 is attached to the opening 311. In this manner, a packaged article 500 including the laminated tube container 400 and the contents C can be manufactured. [Example]

[0105] The present disclosure will be explained in more detail below with reference to examples, but the present disclosure is not limited to these examples.

[0106] Example 1 A material recycled (MR) biaxially oriented PET film (thickness 18 μm) was prepared as the substrate. An aluminum vapor deposition film (thickness 10 nm) was then formed on the surface of the substrate. An overcoat layer (thickness 300 nm) was then formed using a resin composition containing polyvinyl alcohol (PVA) and silicon alkoxide to obtain a structure. Furthermore, petroleum-derived linear low-density polyethylene (LLDPE) films (thickness: 50 μm) were prepared as the first sealant layer and the second sealant layer, respectively. Then, a dry laminating adhesive (urethane adhesive) was applied to the surface of the base material of the structure to form an adhesive layer with a thickness of 3 μm (dry film thickness), and the first sealant layer was attached to this adhesive layer. Next, a dry laminating adhesive (urethane adhesive) was applied onto the overcoat layer of the structure to form an adhesive layer with a thickness of 3 μm (dry film thickness), and a second sealant layer was attached to this adhesive layer. In this way, a laminate (first sealant layer / adhesive layer / substrate / vapor deposition layer / overcoat layer / adhesive layer / second sealant layer) was produced. From the above laminate, a rectangular laminate for the trunk portion measuring 9 cm x 16 cm was prepared. The obtained body laminate was then rolled up with the first sealant layer facing outward, and with both ends (short sides) of the laminate overlapping each other, the first sealant layer and the second sealant layer were heat-sealed at both ends using a heat seal bar to form a first sealed portion, resulting in a cylindrical body with a diameter (inner diameter) of 50.3 mm and a length of 9 cm. The seal width of the first sealed portion was 2 mm. One end of the cylindrical body was then heat-sealed using a heat seal bar to form a second sealed portion. The seal width of the second sealed portion was 8 mm. In this manner, the body was produced. The cap attachment portion was welded to the end of the body portion by compression molding using petroleum-derived high-density polyethylene (HDPE) so that it was integrated with the body portion. At this time, the cap attachment portion was formed to have a cylindrical mouth portion and a shoulder portion connecting the mouth portion and the body portion. The mouth portion had a spiral convex portion formed as a screw portion on its outer periphery. In this way, the container body was produced. On the other hand, a cap was made from a polyolefin resin molded body made of chemically recycled high-density polyethylene (PCRCR100%-HDPE) using used packaging materials. The cap had an inner ring formed on its bottom surface and a spiral recess formed on its inner circumferential surface as a screw section. "PCRCR100%-HDPE" means that the proportion of post-consumer chemically recycled (PCRCR) resin in the cap is 100% by mass. The cap was then placed on the opening of the container body and rotated to attach it, thus completing the production of a laminated tube container. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1.

[0107] Example 2 A laminated tube container was produced in the same manner as in Example 1, except that the material constituting the cap was changed from PCRCR 100%-HDPE to material recycled (MR) 100%-HDPE. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1. It should be noted that "MR100%-HDPE" means that the proportion of MR resin in the cap is 100% by mass.

[0108] Example 3 A laminated tube container was produced in the same manner as in Example 1, except that the material constituting the cap was changed from PCRCR100%-HDPE to MR100%-HDPE, the material constituting the cap attachment portion was changed from petroleum-derived HDPE to PCRCR100%-HDPE, the first sealant layer was changed from a petroleum-derived LLDPE film (thickness 50 μm) to a petroleum-derived LDPE film (thickness 20 μm), and the substrate was changed from MR biaxially oriented PET film to chemically recycled (CR) biaxially oriented PET film. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1.

[0109] Example 4 A laminated tube container was produced in the same manner as in Example 1, except that the substrate was changed from a petroleum-derived biaxially stretched PET film (thickness 18 μm) to a chemically recycled (CR) 50% OPP film (thickness 20 μm) and the first sealant layer was changed from a petroleum-derived LLDPE film (thickness 50 μm) to a petroleum-derived LDPE film (thickness 20 μm). Here, "CR 50% OPP film" means an OPP film in which 50 mass % of the film is chemically recycled resin. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1.

[0110] Example 5 A laminated tube container was produced in the same manner as in Example 1, except that the material constituting the cap attachment part was changed from petroleum-derived HDPE to PCRCR100%-HDPE, and the first and second sealant layers of the body laminate were changed from petroleum-derived LLDPE film to CR25% LLDPE film. Here, "CR25% LLDPE film" refers to an LLDPE film in which 25% by mass of the film is chemically recycled resin. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1.

[0111] (Reference example 1) A laminated tube container was produced in the same manner as in Example 1, except that the material constituting the cap was changed from PCRCR100%-HDPE to petroleum-derived HDPE, and the substrate was changed from MR biaxially oriented PET film to petroleum-derived biaxially oriented PET film. The proportions of recycled resin in the obtained laminated tube container, the proportions of recycled resin in the cap, the proportions of recycled resin in the cap attachment portion, and the proportions of recycled resin in the container body are shown in Table 1.

[0112] <Evaluation> The laminated tube containers of the Examples and Reference Examples prepared as described above were evaluated for environmental load reduction and supplyability as follows.

[0113] (1) Environmental impact reduction The environmental impact reduction was evaluated based on the following criteria, and the results are shown in Table 2. (standard) ◎◎...The proportion of recycled resin in the laminated tube packaging container is 20% by mass or more ◎...The proportion of recycled resin in the laminated tube packaging container is 10% by mass or more but less than 20% by mass. ○…The proportion of recycled resin in the laminated tube container is greater than 0% by mass but less than 10% by mass ×: The proportion of recycled resin in the laminated tube container is 0% by mass (2) Supplyability The feedability was evaluated based on the following criteria, and the results are shown in Table 2. (standard) ◎…Even if more than 10 million laminated tube containers are secured, a stable supply is expected. 〇…If more than 1 million but less than 10 million laminated tube containers are secured, a stable supply is expected. ×…If more than 1 million laminated tube containers are required, it is expected that a stable supply will be difficult.

[0114] [Table 1] [Table 2]

[0115] The results shown in Table 2 show that the laminated tube containers of the examples had good environmental load reduction properties and stable supply properties.

[0116] From the above, it has been confirmed that the laminated tube container of the present disclosure enables stable supply while reducing the environmental burden. [Explanation of symbols]

[0117] 10...substrate, 20...second substrate, 30...second sealant layer, 40...first sealant layer, 50...printed layer, 60...gas barrier layer, 100...laminated body, 300...body portion, 310...cap attachment portion, 311...mouth portion, 320...cap, 330...container body, 400...laminated tube container, 500...packaged article, C...contents.

Claims

1. A container body and a cap are provided. The container body is A laminated tube container having a body portion obtained by using a laminate having a first sealant layer, a substrate, and a second sealant layer in this order, and a cap attachment portion provided on the body portion, the cap attachment portion having a mouth portion, and the cap being attached to the mouth portion, the cap is made of a polyolefin resin molded article containing a first recycled resin, the container body contains a second recycled resin; A laminated tube container, wherein the second recycled resin is not the same as the first recycled resin.

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

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

4. the base material of the container body contains the second recycled resin, 2. The laminated tube container according to claim 1, wherein the second recycled resin comprises recycled polyethylene terephthalate.

5. the container body contains the second recycled resin, The laminated tube container according to claim 1 , wherein the second recycled resin comprises a chemically recycled resin.

6. The proportion of the first recycled resin in the recycled resin in the laminated tube container is 10 to 90%; 2. The laminated tube container according to claim 1, wherein the proportion of the second recycled resin is 90 to 10%.

7. A laminated tube container according to any one of claims 1 to 6, and a content contained in the laminated tube container.

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