Laminate, tube container, and tube container with cap

Abstract

To provide laminates, tube containers, and tube containers with caps that can improve light-shielding properties and design aesthetics. [Solution] The laminate 10 comprises a first sealant layer 21, a base layer 11, and a second sealant layer 22, laminated in this order. The laminate 10 further comprises a light-shielding layer 13, a first shielding layer 12, and a second shielding layer 16. The first sealant layer 21 and the second sealant layer 22 mainly contain polyethylene. The base layer 11 is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. In the laminate 10, the proportion of polyethylene is 90% by mass or more.

Description

[Technical Field]

[0001] This disclosure relates to laminates, tube containers, and tube containers with caps. [Background technology]

[0002] Conventionally, the body of a tube container is manufactured using a packaging material comprising, for example, a heat-seal layer, a printed substrate layer, and a barrier layer (see Patent Document 1). Of these, the heat seal and the like may be made of, for example, polyethylene film, and the printed substrate layer may be, for example, polyethylene terephthalate film on which a printed layer has been formed. The barrier layer may be, for example, polyethylene terephthalate film on which a vapor-deposited film has been formed, or aluminum foil, etc.

[0003] On the other hand, separating polyethylene film and aluminum foil from packaging materials, for example, those containing both polyethylene film and aluminum foil, is generally difficult. Therefore, such packaging materials are not suitable for recycling after use and are not actively recycled. Furthermore, the price of aluminum foil has risen sharply in recent years, making its supply difficult. Moreover, for environmental reasons, many containers may need to be designed to be easily recyclable in the future.

[0004] For this reason, packaging materials are known that have a black ink layer or a gray light-shielding layer (i.e., a mixed layer of black ink and white ink) instead of an aluminum foil layer or an aluminum vapor-deposited layer (Patent Document 2). Patent Document 2 discloses a packaging material that has a shielding layer made of white ink between the pattern printing layer and the light-shielding layer in order to improve the color development of the pattern printing layer. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-214768 [Patent Document 2] Japanese Patent Publication No. 2014-94767 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, even if the packaging material has a shielding layer made of white ink, it may not be able to adequately shield the blackness or darkness caused by the black ink layer or gray light-shielding layer. In this case, when a bag is made from the packaging material, the design on the printed layer may appear dull. For this reason, there is a need for packaging that can improve both light shielding and design aesthetics.

[0007] This disclosure has been made with these points in mind, and aims to provide laminates, tube containers, and tube containers with caps that can improve light-shielding properties and design aesthetics. [Means for solving the problem]

[0008] Embodiments of this disclosure relate to the following [1] to

[17] .

[0009] [1] The first sealant layer, the base material layer, and the second sealant layer are laminated in this order from the outer surface to the inner surface. A light-shielding layer is provided between the first sealant layer and the substrate layer. A first shielding layer is provided between the first sealant layer and the light-shielding layer. A second shielding layer is provided between the first sealant layer and the first shielding layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

[0010] [2] comprises a first sealant layer, a base material layer, and a second sealant layer laminated in this order from the outer side toward the inner side, a light-shielding layer is provided between the base material layer and the second sealant layer, a first shielding layer is provided between the base material layer and the light-shielding layer, a second shielding layer is provided between the base material layer and the first shielding layer, the first sealant layer contains polyethylene as a main component, the base material layer is a stretched film containing at least one selected from the group consisting of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene, the second sealant layer contains polyethylene as a main component, wherein the proportion of polyethylene is 90% by mass or more, and the laminate is provided.

[0011] [3] comprises a first sealant layer, a base material layer, and a second sealant layer laminated in this order from the outer side toward the inner side, a first shielding layer is provided between the first sealant layer and the base material layer, a second shielding layer is provided between the first sealant layer and the first shielding layer, a light-shielding layer is provided between the base material layer and the second sealant layer, the first sealant layer contains polyethylene as a main component, the base material layer is a stretched film containing at least one selected from the group consisting of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene, the second sealant layer contains polyethylene as a main component, wherein the proportion of polyethylene is 90% by mass or more, and the laminate is provided.

[0012] [4] comprises a first sealant layer, a base material layer, and a second sealant layer laminated in this order from the outer side toward the inner side, A light-shielding layer is provided between the substrate layer and the second sealant layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

[0013] [5] The light-shielding layer contains a black pigment, In the light-shielding layer, the content of the black pigment is 4% or more and 50% or less. The laminate according to any one of [1] to [4], wherein the light-shielding layer does not contain metal particles, white pigments, or colored pigments.

[0014] [6] The laminate according to any one of [1] to [5], wherein the first shielding layer contains metal particles.

[0015] [7] The second shielding layer contains white ink, The laminate according to any one of [1] to [6], wherein a pattern printing layer is formed on the outer surface of the second shielding layer.

[0016] [8] The laminate described in any one of [1] to [7], wherein the maximum transmittance of light with a wavelength of 400 nm or more and 800 nm or less, as measured in accordance with JIS K7361-1:1997, is less than 3.0%.

[0017] [9] The laminate according to any one of [1] to [8] further comprises a barrier layer and an intermediate layer provided between the base material layer and the second sealant layer.

[0018]

[10] The laminate according to any one of [1] to [9], wherein the substrate layer is milky white.

[0019]

[11] The laminate according to any one of [1] to [9], wherein the substrate layer is transparent.

[0020]

[12] The laminate according to any one of [1] to [9], wherein the substrate layer is milky white.

[0021]

[13] A laminate according to any one of [1] to

[12] , wherein the density of the first sealant layer and the density of the second sealant layer are equal to each other.

[0022]

[14] In a tube container, A body tube formed by overlapping and joining the opposing edges of a laminate described in any one of [1] to

[13] , A tube container comprising a head member joined to one end of the body tube.

[0023]

[15] The head member comprises polyethylene, as described in

[14] .

[0024]

[16] In a tube container with a cap, A tube container as described in

[14] or

[15] , A capped tube container comprising a cap attached to the head member.

[0025]

[17] The cap is a tube container according to

[16] , comprising polyethylene. [Effects of the Invention]

[0026] According to this disclosure, the light-shielding properties and design aesthetics of the laminate can be improved. [Brief explanation of the drawing]

[0027] [Figure 1] Figure 1 is a partial vertical cross-sectional view showing a capped tube container according to this embodiment. [Figure 2A] Figure 2A is a cross-sectional view showing an example of the layer structure of the laminate according to this embodiment. [Figure 2B] Figure 2B is a cross-sectional view showing an example of the layer structure of the laminate according to this embodiment. [Figure 2C] Figure 2C is a cross-sectional view showing an example of the layer structure of the laminate according to this embodiment. [Figure 2D] Figure 2D is a cross-sectional view showing an example of the layer structure of the laminate according to this embodiment. [Figure 3] Figures 3(a) and 3(b) are schematic diagrams illustrating the method for manufacturing a capped tube container according to this embodiment. [Figure 4] Figure 4 is a perspective view showing the method for manufacturing a tube container with a cap according to this embodiment. [Figure 5] Figures 5(a) and 5(b) are cross-sectional views showing a method for manufacturing a capped tube container according to this embodiment. [Figure 6] Figure 6 is a cross-sectional view showing the method for manufacturing a capped tube container according to this embodiment. [Modes for carrying out the invention]

[0028] An embodiment will be described below with reference to the drawings. Figures 1 to 6 are diagrams illustrating one embodiment. The following figures are schematic diagrams. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. Furthermore, it can be modified as appropriate without departing from the technical concept. In the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as dimensions and material names of each component described in this specification are examples of embodiments and can be selected and used as appropriate without being limited thereto. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, will be interpreted to include not only their strict meaning but also substantially the same state.

[0029] <Tube containers with caps and tube containers> As shown in Figure 1, the capped tube container 40A according to this embodiment comprises a tube container 40 and a cap 49 attached to a head member 43 of the tube container 40, which will be described later.

[0030] The tube container 40 comprises a body tube 41 which is a laminated tube, and a head member 43 joined to one end 42 of the body tube 41. The body tube 41 has a substantially cylindrical shape overall. This body tube 41 is made of a laminate 10 which is a packaging material for the tube container. In this case, the body tube 41 may be configured such that the outer surface of the packaging material for the tube container (i.e., the outer surface 101 of the laminate 10 described later) faces away from the contents, and the inner surface (i.e., the inner surface 102 of the laminate 10 described later) faces the contents.

[0031] The body tube 41 has a body seal portion 44 formed by joining together two pieces of packaging material for tube containers. This body seal portion 44 is formed along the longitudinal direction of the body tube 41. Such a body tube 41 may be obtained, for example, by rolling the packaging material for tube containers into a cylindrical shape, overlapping the opposing edges of the packaging material for tube containers, and joining them together, for example, by heat sealing.

[0032] Furthermore, the body tube 41 has a bottom seal portion 45 where the packaging materials for the tube container are joined together. This bottom seal portion 45 is the part where the packaging materials for the tube container near the opening are joined together after an appropriate amount of contents C has been filled through an opening (not shown) formed at the other end 46 of the body tube 41.

[0033] The head member 43 has shoulder portions 47 and mouth portions 48. A cap 49 is attached to the mouth portions 48. The head member 43 is molded, for example, by compression molding. The head member 43 is made from a resin material such as polyethylene (e.g., high-density polyethylene (HDPE)). The cap is made from a resin material such as polyethylene (e.g., high-density polyethylene (HDPE)).

[0034] Next, the layer structure of the laminate 10 will be described. Figures 2A to 2C show an example of the layer structure of the laminate 10 that constitutes the body tube 41. As shown in Figures 2A to 2C, the laminate 10 is provided with a first sealant layer 21, a base material layer 11, and a second sealant layer 22 laminated in this order from the outer surface 101 to the inner surface 102. The outer surface 101 is the surface of the tube container 40 that faces away from the contents side. The inner surface 102 is the surface of the tube container 40 that faces the contents side.

[0035] Furthermore, the laminate 10 may further comprise a light-shielding layer 13. Also, the laminate 10 may further comprise a first shielding layer 12 and a second shielding layer 16. Furthermore, the laminate 10 may further comprise a barrier layer 17 and an intermediate layer 18 provided between the base layer 11 and the second sealant layer 22.

[0036] Specifically, as shown in Figure 2A, a light-shielding layer 13 may be provided between the first sealant layer 21 and the substrate layer 11, a first shielding layer 12 may be provided between the first sealant layer 21 and the light-shielding layer 13, and a second shielding layer 16 may be provided between the first sealant layer 21 and the first shielding layer 12. In this case, as shown in Figure 2A, the laminate 10 is provided in the following order from the outer surface 101 to the inner surface 102: first sealant layer 21, adhesive layer 19a, anchor coat layer 23, pattern printing layer 15, second shielding layer 16, first shielding layer 12, light-shielding layer 13, substrate layer 11, adhesive layer 19b, barrier layer 17, adhesive layer 19c, intermediate layer 18, adhesive layer 19d, and second sealant layer 22.

[0037] Furthermore, as shown in Figure 2B, a light-shielding layer 13 may be provided between the base layer 11 and the second sealant layer 22, a first shielding layer 12 may be provided between the base layer 11 and the light-shielding layer 13, and a second shielding layer 16 may be provided between the base layer 11 and the first shielding layer 12. In this case, as shown in Figure 2B, the laminate 10 is provided in the following order from the outer surface 101 to the inner surface 102: first sealant layer 21, adhesive layer 19a, anchor coat layer 23, base layer 11, pattern printing layer 15, second shielding layer 16, first shielding layer 12, light-shielding layer 13, anchor coat layer 23, adhesive layer 19b, barrier layer 17, adhesive layer 19c, intermediate layer 18, adhesive layer 19d, and second sealant layer 22.

[0038] Furthermore, as shown in Figure 2C, a first shielding layer 12 may be provided between the first sealant layer 21 and the base material layer 11, a second shielding layer 16 may be provided between the first sealant layer 21 and the first shielding layer 12, and a light-shielding layer 13 may be provided between the base material layer 11 and the second sealant layer 22. In this case, as shown in Figure 2C, the laminate 10 is provided in the following order from the outer surface 101 to the inner surface 102: first sealant layer 21, adhesive layer 19a, anchor coat layer 23, pattern printing layer 15, second shielding layer 16, first shielding layer 12, base material layer 11, light-shielding layer 13, anchor coat layer 23, adhesive layer 19b, barrier layer 17, adhesive layer 19c, intermediate layer 18, adhesive layer 19d, and second sealant layer 22.

[0039] Furthermore, as shown in Figure 2D, a light-shielding layer 13 may be provided between the base layer 11 and the second sealant layer 22. In this case, as shown in Figure 2D, the laminate 10 comprises, in order from the outer surface 101 to the inner surface 102, a first sealant layer 21, an adhesive layer 19a, an anchor coat layer 23, a pattern printing layer 15, a base layer 11, a light-shielding layer 13, an anchor coat layer 23, an adhesive layer 19b, a barrier layer 17, an adhesive layer 19c, an intermediate layer 18, an adhesive layer 19d, and a second sealant layer 22. In this case, unlike the laminate 10 shown in Figure 2C, a first shielding layer 12 is not provided between the first sealant layer 21 and the base layer 11, and a second shielding layer 16 is not provided between the first sealant layer 21 and the first shielding layer 12.

[0040] The following describes each layer of the laminate 10.

[0041] <<First sealant layer>> The first sealant layer 21 is a layer for bonding the laminates 10 together, and the material constituting the first sealant layer 21 can be any material that melts and fuses when heated.

[0042] The first sealant layer 21 mainly contains polyethylene. As the first sealant layer 21, for example, a film can be used that consists of one or more of the following: low-density polyethylene (LDPE) film, medium-density polyethylene (MDPE) film, high-density polyethylene (HDPE) film, linear low-density polyethylene (LLDPE) film, polypropylene film, acid-modified polyolefin resin film obtained by modifying polyethylene or polypropylene with acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, or other unsaturated carboxylic acids, polyvinyl acetate resin film, polyester resin film, polystyrene resin film, polyacrylonitrile, saturated polyester, polyvinyl alcohol, or other resins.

[0043] Here, low-density polyethylene has a density of 910 kg / m³. 3 More than 930kg / m 3 The following polyethylenes are used. Medium-density polyethylene has a density of 930 kg / m³. 3 More than 942kg / m 3 The following polyethylenes are used. Furthermore, high-density polyethylene has a density of 942 kg / m³. 3 The above describes polyethylene. Low-density polyethylene can be obtained, for example, by polymerizing ethylene at a high pressure of 1000 atmospheres or more but less than 2000 atmospheres. Medium-density polyethylene and high-density polyethylene can be obtained, for example, by polymerizing ethylene at a medium or low pressure of 1 atmosphere or more but less than 1000 atmospheres.

[0044] Medium-density polyethylene and high-density polyethylene may partially contain copolymers of ethylene and α-olefins. Furthermore, even when polymerizing ethylene at medium or low pressure, medium-density or low-density polyethylene can be produced if it contains copolymers of ethylene and α-olefins. The linear low-density polyethylene described above is such a polyethylene. Linear low-density polyethylene is obtained by copolymerizing a linear polymer obtained by polymerizing ethylene at medium or low pressure with α-olefins to introduce short-chain branching. Examples of α-olefins include 1-butene (C4), 1-hexene (C6), 4-methylpentene (C6), and 1-octene (C8). The density of linear low-density polyethylene is, for example, 915 kg / m³. 3 More than 945kg / m 3 The following applies:

[0045] The first sealant layer 21 may also contain a biomass-derived resin. For example, if the first sealant layer 21 contains polyethylene or polypropylene, the polyethylene may be biomass polyethylene, and the polypropylene may be biomass polypropylene. By including a biomass-derived resin in the first sealant layer 21, the amount of fossil fuels used can be reduced, thereby reducing the environmental burden of the laminate 10. Biomass polyethylene is a monomer polymer containing biomass-derived ethylene. Since biomass-derived ethylene is used as the raw material monomer, the resulting polyolefin is biomass-derived. The content of biomass-derived ethylene in the raw material monomer does not need to be 100% by mass, but is preferably 50% or more, more preferably 80% or more. The raw material monomer may contain fossil fuel-derived ethylene, or it may contain α-olefin monomers such as butylene, hexene, and octene.

[0046] For example, biomass-derived ethylene can be produced using biomass-derived ethanol as a raw material. In particular, it is preferable to use biomass-derived fermented ethanol obtained from plant materials. The plant materials are not particularly limited, and conventionally known plants can be used. Conventionally known plants include, for example, corn, sugarcane, beet, and manioc.

[0047] In this embodiment, the heat-sealable film can be prepared by mainly using one or more of the above-mentioned resins, and optionally adding desired additives thereto to prepare a resin composition. Then, using the resin composition prepared above, a film or sheet can be formed using, for example, a T-die method, an inflation method, or other molding method.

[0048] Furthermore, the material used for the first sealant layer 21 described above may optionally contain, for example, an antiblocking agent, a lubricant (such as a fatty acid amide), a flame retardant, an inorganic or organic filler, etc.

[0049] It is preferable that the density of the first sealant layer 21 and the density of the second sealant layer 22 are equal to each other. This makes it possible to increase the adhesive strength of the body seal portion 44, etc.

[0050] Furthermore, in this embodiment, the thickness of the first sealant layer 21 is preferably 30 μm or more and 250 μm or less.

[0051] <<Base layer and intermediate layer>> The base layer 11 and the intermediate layer 18 (hereinafter also simply referred to as the base layer 11, etc.) are layers that support, for example, the first sealant layer 21 and the second sealant layer 22, and increase the overall strength of the laminate 10.

[0052] Of these, the base layer 11 is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The base layer 11 may be milky white or transparent.

[0053] As the intermediate layer 18, films made of low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, polyvinyl alcohol, polyacrylonitrile, polycarbonate, ethylene-vinyl acetate copolymer, ionomer, ethylene-(meth)acrylic acid copolymer, ethylene-(meth)acrylate ethyl copolymer, ethylene-propylene copolymer, methylpentene, polybutene, acid-modified polyolefin resin, polyamide resin, polystyrene resin, low-crystalline saturated polyester or amorphous polyester resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), tetrafluoroethylene-ethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), MXD6, etc. can be used.

[0054] Among the resin films mentioned above, polyester resins such as polyethylene terephthalate (hereinafter also referred to as "PET"), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and polybutylene naphthalate (PBN); polyamide resins such as polycapronamide (nylon 6), polyhexamethylene adipamide (nylon 66), and poly-p-xylylene adipamide (MXD6 nylon); and polyolefin resins such as polyethylene and polypropylene are preferred. In particular, PET film is preferred as a material for the intermediate layer 18 for reasons such as its high transparency, excellent dimensional stability, and heat resistance. A mixture of the polyester resin, polyamide resin, and polyolefin resin mentioned above may be used as the material for the intermediate layer 18. The resin film constituting the intermediate layer 18 may be an unoriented film, but from the viewpoint of transparency, a uniaxially oriented film or a biaxially oriented film may be preferred.

[0055] The base layer 11 may be composed of a multilayer film formed by laminating two or more resin films. When the base layer 11 is composed of a multilayer film, each layer may have the same composition or different compositions. Furthermore, it is preferable that the base layer 11 is transparent or light-transmitting.

[0056] The thickness of the base layer 11 is not particularly limited, but may be approximately 5 μm to 50 μm, 5 μm to 40 μm, or 10 μm to 30 μm.

[0057] The surface of the substrate layer 11, etc., may be subjected to surface treatments such as corona treatment, ozone treatment, or flame treatment. This can improve the adhesion of other layers to the substrate layer 11, etc.

[0058] <<Second sealant layer>> The second sealant layer 22 is a layer for bonding the laminates 10 together, and the material constituting the second sealant layer 22 can be any material that melts and fuses when heated. The second sealant layer 22 mainly contains polyethylene. The material and thickness of the second sealant layer 22 may be the same as, for example, the first sealant layer 21 described above.

[0059] <<First shielding layer>> The first shielding layer 12 is a layer that blocks light that penetrates the substrate layer 11 and the like from the outside. The first shielding layer 12 is also a layer that blocks the darkness and blackness of the light-shielding layer 13. The first shielding layer 12 contains metal particles. Metal particles exhibit a metallic luster and reflect light better than inorganic or organic pigments. As a result, because the first shielding layer 12 contains metal particles, the brightness of the pattern on the pattern printing layer 15 located on the outer surface 101 side of the first shielding layer 12 is increased, and the colors of the pattern become vivid and clear without dullness. This improves the design of the laminate 10.

[0060] The metal particles are preferably particles of a metallic material that yields a silvery metallic luster. In this case, the metal particles are more preferably aluminum particles. When the metal particles are aluminum particles, the particle shape may be spherical, but is preferably flaky. When the aluminum particles are spherical, the particle size may be, for example, between 0.1 μm and 3.0 μm. When the aluminum particles are flaky, the average thickness of the aluminum particles may be between 0.01 μm and 0.30 μm, and the length of the aluminum particles may be between 1 μm and 10 μm.

[0061] Furthermore, the aspect ratio (average particle diameter / average thickness) of the aluminum particles may be between 25 and 100, or between 30 and 50. When the aspect ratio (average particle diameter / average thickness) is 25 or higher, the aluminum particles are less likely to tilt within the first shielding layer 12. As a result, the aluminum particles are more likely to be stacked in the thickness direction within the first shielding layer 12. This results in multiple reflections between the aluminum particles, improving the shielding performance against darkness and blackness of the light-shielding layer 13. Also, when the aspect ratio (average particle diameter / average thickness) is 100 or lower, even if the aluminum particles tilt, adjacent aluminum particles are less likely to come into contact with each other, resulting in good microwave resistance.

[0062] The first shielding layer 12 may contain the above-mentioned metal particles and a binder resin, and can be formed on the second shielding layer 16 by printing using an ink containing various additives as needed. The metal particle content of the ink may be approximately 5% by mass or more and 15% by mass or less. The binder resin content of the ink may be approximately 5% by mass or more and 15% by mass or less. A known ink, such as silver ink, may also be used for the first shielding layer 12.

[0063] The method for printing the ink may be any known printing method, such as gravure printing, offset printing, letterpress printing, or screen printing. The thickness of the first shielding layer 12 (amount of ink applied) depends on the content of metal particles in the ink, but it can be set to a thickness that ensures the necessary light shielding to prevent deterioration of the contents when producing labels 20, etc., as described later. Specifically, the thickness of the first shielding layer 12 may be, for example, 0.5 μm or more and 5.0 μm or less. By setting the thickness of the first shielding layer 12 to 0.5 μm or more, the shielding performance against light transmitted from the outside through the substrate layer 11, etc., and against the darkness and blackness of the light shielding layer 13 can be effectively improved. Furthermore, by setting the thickness of the first shielding layer 12 to 5.0 μm or less, the adhesion of the ink can be maintained while suppressing a decrease in lamination strength between layers adjacent to the first shielding layer 12.

[0064] <<Light blocking layer>> The light-shielding layer 13 is a layer that blocks light that penetrates the substrate layer 11 and other layers from the outside. This light-shielding layer 13 is directly laminated on the first shielding layer 12. Furthermore, the light-shielding layer 13 is a different layer from the first shielding layer 12. Therefore, an interface exists between the light-shielding layer 13 and the first shielding layer 12. In this way, the existence of an interface between the light-shielding layer 13 and the first shielding layer 12 prevents the mixing of the black ink (black pigment) of the light-shielding layer 13 (described later) and the metal particles of the first shielding layer 12 (described above). Therefore, unevenness in the light-shielding performance of the light-shielding layer 13 can be suppressed, and the light-shielding performance of the light-shielding layer 13 can be enhanced. In addition, because the mixing of the black ink of the light-shielding layer 13 (described later) and the metal particles of the first shielding layer 12 (described above) can be suppressed, a decrease in laminate strength between adjacent layers of the light-shielding layer 13 and the first shielding layer 12 can be suppressed. Furthermore, since the mixing of the black ink in the light-shielding layer 13 (described later) and the metal particles in the first shielding layer 12 can be suppressed, the concealing effect of the light-shielding layer 13 (suppression of the pattern sinking) can be enhanced without being affected by the pattern. As a result, the aesthetic appeal of the laminate 10 can be improved.

[0065] The light-shielding layer 13 contains a black pigment. In this case, the content of the black pigment in the light-shielding layer 13 may be between 4% and 50%. By having a black pigment content of 4% or more in the light-shielding layer 13, light transmitted from the outside through the substrate layer 11 can be effectively blocked. Furthermore, by having a black pigment content of 50% or less in the light-shielding layer 13, the appearance of the laminate 10 when viewed from the substrate layer 11 side can be effectively suppressed.

[0066] The light-shielding layer 13 may contain a black ink containing a black pigment. The black ink may contain at least one pigment from among black organic and inorganic pigments, and a binder resin. As the black ink, a known ink containing various additives as needed may be used. For example, black ink may be used as the black ink.

[0067] It is also preferable that the light-shielding layer 13 does not contain metal particles, white pigments or colored pigments. In this case, it is preferable that the light-shielding layer 13 is composed only of black ink containing a black pigment. This can suppress the occurrence of unevenness in the light-shielding property provided by the light-shielding layer 13, and can enhance the light-shielding property of the light-shielding layer 13. In addition, since the light-shielding layer 13 does not contain metal particles, white pigments or colored pigments, it is possible to suppress a decrease in lamination strength between layers adjacent to the light-shielding layer 13, while enhancing the hiding effect (suppression of pattern sinking) provided by the light-shielding layer 13.

[0068] The ISO whiteness of the back surface of the light-shielding layer 13 may be 7 or less. The back surface of the light-shielding layer 13 refers to the surface of the light-shielding layer 13 that is on the inner surface 102 side of the laminate 10. When the ISO whiteness of the back surface of the light-shielding layer 13 is 7 or less, a decrease in light-shielding property can be suppressed. Therefore, the risk of deterioration of the contents can be reduced.

[0069] Furthermore, the L on the back surface of the light-shielding layer 13 * value may be 1 or more and 30 or less. Note that the L * value is the L * a * b * color system, and can be measured using a spectrophotometer (SpectroEye, manufactured by Sakata Inx Corporation). The L on the back surface of the light-shielding layer 13 * When the value is 30 or less, a decrease in light-shielding property can be suppressed. Therefore, the risk of deterioration of the contents can be reduced.

[0070] Furthermore, the total light transmittance of the light-shielding layer 13 may be 2% or less. This improves the light-shielding properties of the laminate 10. The total light transmittance can be measured using a haze meter (product name "HM-150", manufactured by Murakami Color Technology Laboratory Co., Ltd., measuring diameter 20 mmφ) in accordance with JIS K7361-1:1997. Specifically, first, the light-shielding layer 13 is removed from the laminate 10, and three square test pieces with sides of 50 mm are cut out. Then, the test pieces are placed in the haze meter, taking care not to cause wrinkles or other damage. At this time, the test pieces are placed in the haze meter so that the surface of the light-shielding layer 13 (the surface facing the outer surface 101 of the laminate 10) is facing the light source. Next, the test pieces are held in an environment of 25°C and 50% relative humidity for 1 minute, and then the total light transmittance of the test pieces is measured in an environment of 25°C and 50% relative humidity. The total light transmittance is measured for three test specimens, and the average value is taken as the total light transmittance of the light-shielding layer 13.

[0071] The thickness of such a light-shielding layer 13 may be, for example, between 0.1 μm and 3.0 μm. A thickness of 0.1 μm or more for the light-shielding layer 13 effectively improves the shielding against light transmitted from the outside through the substrate layer 11, etc. Furthermore, a thickness of 3.0 μm or less for the light-shielding layer 13 suppresses blocking during printing and also suppresses the sinking of the image.

[0072] <<Picture Printing Layer>> The pattern printing layer 15 is a layer for enhancing the design of the laminate 10. This pattern printing layer 15 is a layer in which a pattern such as predetermined characters, figures, designs, or color coding is formed by ink. Known inks may be used. For example, the ink may contain at least one of organic pigments and inorganic pigments and a binder resin, and may further contain various additives as needed. The pattern printing layer 15 can be formed, for example, on the outer surface 101 side of the second shielding layer 16 by known printing methods such as gravure printing, offset printing, letterpress printing, or screen printing.

[0073] In this embodiment, the pattern printing layer 15 does not constitute the outer surface 101 of the laminate 10. Therefore, it is possible to suppress the disappearance of the pattern printing layer 15 due to friction, etc., and to effectively suppress tampering with the pattern.

[0074] <<Second shielding layer>> The second shielding layer 16 is a layer that shields the darkness and blackness of the light-shielding layer 13, so that when the pattern of the pattern printing layer 15 is viewed from the substrate layer 11 side, it appears as a white background. As shown in Figures 2A to 2C, the pattern printing layer 15 is formed on the outer surface 101 side of the second shielding layer 16. The second shielding layer 16 contains white ink. The white ink may contain at least one white pigment from among organic pigments and inorganic pigments, and a binder resin. As the white ink, a known white ink containing various additives as needed may be used.

[0075] The second shielding layer 16 can be formed by known printing methods, such as gravure printing, offset printing, letterpress printing, or screen printing.

[0076] The thickness of the second shielding layer 16 is preferably such that it can block the darkness and blackness caused by the color of the light-shielding layer 13, and may be, for example, 0.1 μm to 5 μm. The thickness of the second shielding layer 16 can be adjusted when printing the second shielding layer 16.

[0077] <<Barrier layer>> The barrier layer 17 is a layer for suppressing the permeation of oxygen gas and water vapor, etc. Because the laminate 10 is equipped with the barrier layer 17, the permeation of oxygen gas, etc., can be suppressed, effectively preventing weight loss and deterioration of the contents.

[0078] The barrier layer 17 may be, for example, a vapor-deposited film of an inorganic substance or an inorganic oxide, or a layer made of a gas barrier resin such as ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyvinyl alcohol, or MXD6. Alternatively, the barrier layer 17 may be an ethylene-vinyl alcohol copolymer (EVOH) barrier film, as described later. Furthermore, the barrier layer 17 may be composed of a combination of the vapor-deposited films or gas barrier resin layers mentioned above.

[0079] To ensure visibility of the contents, the barrier layer 17 is preferably transparent. In this case, a vapor-deposited film of an inorganic oxide can be particularly preferably used as the barrier layer 17. The inorganic oxide that forms the vapor-deposited film can be any inorganic oxide that is transparent and has gas barrier properties against oxygen gas and water vapor, etc. Examples of such inorganic oxides include alumina (aluminum oxide), silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, or barium oxide. Of these, aluminum oxide and silicon oxide can be particularly preferably used from the viewpoint of gas barrier properties and production efficiency.

[0080] Furthermore, the surface of the barrier layer 17 may be subjected to surface treatments such as corona treatment, ozone treatment, or flame treatment. This can improve the adhesion of other layers to the barrier layer 17. For example, when a pattern printing layer 15 is formed on the surface of the barrier layer 17, it is preferable that the surface treatment be applied to at least the surface of the barrier layer 17 on which the pattern printing layer 15 is formed.

[0081] <<adhesive layer>> The adhesive layer is a layer used to bond the base layer 11, the intermediate layer 18, and the sealant layer 14 to each other using a dry lamination method or the like.

[0082] The adhesive used to constitute the adhesive layer may include one-component or two-component curing or non-curing vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, polyvinyl acetate adhesives, polyacrylic acid ester adhesives consisting of homopolymers such as ethyl, butyl, and 2-ethylhexyl acrylic acid or copolymers thereof with methyl methacrylate, acrylonitrile, styrene, etc., cyanoacrylate adhesives, ethylene copolymer adhesives consisting of copolymers of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, and methacrylic acid, cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives consisting of urea resin or melamine resin, phenolic resin adhesives, epoxy adhesives, polyurethane adhesives, reactive (meth)acrylic acid adhesives, inorganic adhesives consisting of chloroprene rubber, nitrile rubber, styrene-butadiene rubber, etc., silicone adhesives, inorganic adhesives consisting of alkali metal silicates, low-melting-point glass, etc., and other adhesives. For example, a polyurethane resin is preferred that is mainly composed of a polyfunctional isocyanate such as an aromatic polyisocyanate such as tolylene diisocyanate, diphenylmethane diisocyanate, or polymethylene polyphenylene polyisocyanate, or an aliphatic polyisocyanate such as hexamethylene diisocyanate or xylylene diisocyanate, and a polyether polyol, polyester polyol, polyacrylate polyol, or other hydroxyl group-containing compound. With these, a thin film with excellent flexibility and bendability can be formed, and it can act as a coating with flexibility and bendability, improving the suitability for processing such as lamination and printing.

[0083] The above adhesive can be applied using, for example, the direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, fontein method, transfer roll coating method, or other coating method, and the solvent can be dried to form an adhesive layer. The amount of adhesive to be applied is 1.5 g / m². 2 More than 10g / m 2The following (in a dry state) is also acceptable: 3g / m 2 More than 5g / m 2 The following conditions (dry state) are also acceptable. The thickness of the adhesive layer in the dry state may be 1.5 μm or more and 10 μm or less, or 3 μm or more and 5 μm or less.

[0084] (Anchor coat layer) The anchor coat layer 23 is a layer for improving the adhesion between layers. This anchor coat layer 23 is formed by applying and drying an anchor coat agent. Examples of anchor coat agents include any resin with a heat resistance temperature of 135°C or higher, such as vinyl-modified resins, epoxy resins, urethane resins, polyester resins, polyethyleneimines, etc. In particular, an anchor coat agent that is a cured product of a polyacrylic or polymethacrylic resin (polyol) having two or more hydroxyl groups in its structure and an isocyanate compound as a curing agent can be preferably used. In addition, a silane coupling agent may be used in combination as an additive, and nitrated cotton may also be used in combination to improve heat resistance. The anchor coat layer 23 after drying is preferably 0.3 μm to 10 μm thick.

[0085] In such a laminate 10, the maximum transmittance of light rays with wavelengths between 400 nm and 800 nm may be less than 3.0%. This improves the light-shielding properties of the laminate 10. The transmittance can be measured using a haze meter (product name "HM-150", manufactured by Murakami Color Technology Laboratory Co., Ltd., measuring diameter 20 mmφ) in accordance with JIS K7361-1:1997. Specifically, first, three square test pieces with sides of 50 mm are cut from the laminate 10. The test pieces may include the patterned printing layer. Then, the test pieces are placed in the haze meter, taking care not to cause wrinkles or other damage. At this time, the test pieces are placed in the haze meter so that the base material layer 11 side is the light source side. Next, the test pieces are held in an environment of 25°C and 50% relative humidity for 1 minute, and then the transmittance of the test pieces is measured in an environment of 25°C and 50% relative humidity. The transmittance of three test specimens is measured, and the maximum value is taken as the maximum transmittance of the laminate.

[0086] Furthermore, in the laminate 10, at least 90% or more is made of the same resin system material. In this embodiment, the proportion of polyethylene in the laminate 10 is 90% by mass or more. In this case, the laminate 10 can be classified as a so-called monomaterial material and can be suitably used to manufacture tube containers (so-called monomaterial packaging containers) made of the same material. Here, examples of polyethylene include high-density polyethylene and linear low-density polyethylene. These high-density polyethylenes and linear low-density polyethylenes are classified as "materials of the same resin system" in this specification. On the other hand, polyethylene and polyester, for example, are not classified as materials of the same resin system.

[0087] (Manufacturing method for tube containers with caps) Next, with reference to Figures 3 to 6, a method for manufacturing the capped tube container 40A will be described.

[0088] First, prepare a laminate 10, for example, as shown in Figure 2A.

[0089] Next, a tube container 40 is manufactured from the resulting laminate 10.

[0090] First, the laminate 10 is rolled up and the opposing edges are joined together, for example, by heat sealing, to form a cylindrical tube and create the body tube 41. At this time, as shown in Figures 3(a)-(b), the laminate 10 is first wrapped around the outer surface of the cylindrical inner sealing member 80, and the opposing edges of the laminate 10 are overlapped. At this time, the laminate 10 is wrapped around the inner sealing member 80 so that the second sealant layer 22 of the laminate 10 faces the outer surface of the inner sealing member 80. The inner sealing member 80 can be made of metal, for example, stainless steel. When the opposing edges of the laminate 10 are overlapped, the laminate 10 is conveyed downstream (to the left in Figures 3(a)-(b)) by a conveyor belt and guide rolls (not shown).

[0091] Next, as shown in Figure 3(b), the outer sealing member 81 is pressed against the portion where the opposing edges of the laminate 10 overlap, and the portion where the opposing edges of the laminate 10 overlap is sandwiched between the inner sealing member 80 and the outer sealing member 81. Then, the portion where the opposing edges of the laminate 10 overlap is joined by heat sealing. In this case, the first sealant layer 21 (see Figure 2A, etc.) provided on the outer surface 101 side of the laminate 10 and the second sealant layer 22 (see Figure 2A, etc.) provided on the inner surface 102 side melt and join together, forming the body seal portion 44.

[0092] Subsequently, the joined laminate 10 is cut into individual body tubes 41. In this way, the body tubes 41 are produced as shown in Figure 4. At this time, the speed at which the body tubes 41 are produced may be as high as 300 tubes / min.

[0093] Next, the tube container 40 described above is manufactured by compression molding.

[0094] In this process, as shown in Figure 5(a), the cylindrical laminate 10 (body tube 41) is wrapped around the mandrel 72, and a mold 71 for compression molding the head member 43 is attached to one end of the mandrel 72. That is, the laminate 10 (body tube 41), which has been pre-formed into a cylindrical shape, is inserted into the mandrel 72, whose tip is the core for compression molding the head member 43, and then advanced into the cavity of the mold 71 for molding the head member 43 to a predetermined position.

[0095] Next, the head member 43 is compression molded by supplying molten resin from a resin supply device (not shown) into the mold 71. In this case, by inserting one end 42 of the body tube 41 into the mold 71, the head member 43 is molded and at the same time the body tube 41 is integrally fused to the head member 43. After that, the integrated head member 43 and body tube 41 are removed from the mold 71 and mandrel 72 to obtain a tube container 40 comprising the body tube 41 and the head member 43 joined to one end 42 of the body tube 41 (see Figure 5(b)).

[0096] Furthermore, when manufacturing the capped tube container 40A, the cap 49 is prepared in parallel with the manufacturing of the tube container 40. In this case, the cap 49 is manufactured by injection molding using, for example, an injection molding machine (not shown). Then, by screwing the cap 49 onto the opening of the head member 43 of the tube container 40, the capped tube container 40A is obtained as shown in Figure 6.

[0097] Subsequently, an appropriate amount of contents C is filled through the opening 41B (see Figures 4 and 6) of the body tube 41. Then, the bottom seal portion 45 (see Figure 1) is formed by welding the opening 41B. In this way, a capped tube container 40A filled and packaged with contents C is obtained.

[0098] As described above, according to this embodiment, the laminate 10 is provided with a first sealant layer 21, a base material layer 11, and a second sealant layer 22 laminated in this order from the outer surface 101 to the inner surface 102. Furthermore, the laminate 10 is provided with a second shielding layer 16, a first shielding layer 12, and a light-shielding layer 13. This provides the laminate 10 with light-shielding properties and excellent metallic luster. Therefore, according to this embodiment, the light-shielding properties and design of the laminate 10 can be improved.

[0099] Furthermore, according to this embodiment, the proportion of polyethylene in the laminate 10 is 90% by mass or more. In this case, the laminate 10 can be classified as a so-called monomaterial material and can be suitably used to manufacture tube containers (so-called monomaterial packaging containers) made of the same material.

[0100] Furthermore, according to this embodiment, the first shielding layer 12 contains metal particles. In addition, the light-shielding layer 13 contains a black pigment. Thus, by having the laminate 10 comprise the first shielding layer 12 containing metal particles and the light-shielding layer 13 containing a black pigment, the laminate 10 can be given light-shielding properties and excellent metallic luster. Moreover, according to this embodiment, the metal particles of the first shielding layer 12 and the black pigment of the light-shielding layer 13 do not mix. This prevents the laminate 10 from becoming dark. In this way, according to this embodiment, the light-shielding properties and design of the laminate 10 can be improved.

[0101] Furthermore, since the first shielding layer 12 containing metal particles and the light-shielding layer 13 containing black pigment are composed of different layers, the lamination strength of the laminate 10 can be improved.

[0102] Furthermore, according to this embodiment, the light-shielding layer 13 does not contain metal particles, white pigments, or colored pigments. This suppresses unevenness in the light-shielding properties of the light-shielding layer 13 and enhances the light-shielding properties of the light-shielding layer 13. In addition, by not containing metal particles, white pigments, or colored pigments in the light-shielding layer 13, it is possible to suppress a decrease in laminate strength between layers adjacent to the light-shielding layer 13 while enhancing the opacity effect (suppression of pattern blurring) of the light-shielding layer 13.

[0103] Furthermore, according to this embodiment, the second shielding layer 16 contains white ink. This allows the second shielding layer 16 to block the darkness and blackness of the light-shielding layer 13. Also, when the pattern of the pattern printing layer 15 is viewed from the substrate layer 11 side, it can appear as a white background to the laminate 10.

[0104] Furthermore, according to this embodiment, the laminate 10 further comprises a base layer 11, a second sealant layer 22, a barrier layer 17, and an intermediate layer 18. This improves the barrier properties of the laminate 10 against oxygen gas and water vapor. It also increases the rigidity of the laminate 10 and improves its impact resistance and pinhole resistance. [Examples]

[0105] Next, we will describe specific examples of the above embodiments.

[0106] (Example 1) First, a laminate as shown in Figure 2A was fabricated. For this, a uniaxially oriented high-density polyethylene film (Hybron SMKQW (product name), manufactured by Tokyo Ink Co., Ltd., 25 μm thick) was prepared as the base layer. Next, a light-shielding layer, a first shielding layer, a second shielding layer, and a pattern printing layer were formed on one side of the uniaxially oriented high-density polyethylene film by gravure printing and drying. At this time, the first shielding layer used an ink containing metal particles, and the light-shielding layer was made to have a black pigment content of 30%.

[0107] Next, an ethylene-vinyl alcohol copolymer (EVOH) barrier film was prepared as the barrier layer. The EVOH barrier film was made of linear low-density polyethylene (LLDPE) (Dow Chemical, DOWLEX2045G (product name), density: 0.920 g / cm³). 3 ) and adhesive resin (Mitsui Chemicals, Admer NF557 (product name)) and ethylene-vinyl alcohol copolymer (EVOH (Kuraray, EVAL F171B (product name), density: 1.19 g / cm³) 3 (ethylene content: 32 mol%), adhesive resin (Mitsui Chemicals, Admer NF557 (product name)), and linear low-density polyethylene (LLDPE (Dow Chemical, DOWLEX2045G (product name), density: 0.920 g / cm³) 3 The films were fabricated by co-extruding five layers of these materials using the inflation method. In the EVOH-based barrier film, the thickness of the linear low-density polyethylene was 26 μm, the thickness of the adhesive resin was 4 μm, and the thickness of the ethylene-vinyl alcohol copolymer was 15 μm.

[0108] Next, lamination was performed using the tandem extrusion lamination method as follows. First, a 20 μm thick extruded polyethylene layer was formed on one side of the EVOH-based barrier film by melt-extruding low-density polyethylene (LDPE (LC602A (product name))) at 330°C. Then, a milky white polyethylene film (SR-WN2 milky white (product name), 50 μm thick) was laminated as an intermediate layer via this extruded polyethylene layer. Next, a 30 μm thick extruded polyethylene layer was formed on the surface of the laminated milky white polyethylene film by melt-extruding low-density polyethylene (LDPE (LC602A (product name))) at 330°C. Then, a linear low-density polyethylene film (Aicello, Suzuron L-100N (product name), 50 μm thick) was laminated as a second sealant layer via this extruded polyethylene layer. The milky white polyethylene film used as an intermediate layer is made of polyethylene (density: 0.920 g / cm³). 3 The film was obtained by forming a film from a mixture of 94% by mass of (MFR: 1.9g / 10 min) and 6% by mass of a white pigment (titanium dioxide-based pigment).

[0109] Next, lamination was performed using the tandem extrusion lamination method as follows. First, a 20 μm thick extruded polyethylene layer was formed on the other side of the EVOH-based barrier film by melt-extruding low-density polyethylene (LDPE (LC602A (product name))) at 330°C. Then, a substrate layer with a printed pattern layer was laminated to this extruded polyethylene layer. Next, an anchor coat layer was formed on the surface of the printed pattern layer by applying and drying an anchor coat agent (Toyo Morton, EL-510 / CAT-RT80 (product name), diluent: ethyl acetate). Then, a 20 μm thick extruded polyethylene layer was formed on the surface of the anchor coat layer by melt-extruding low-density polyethylene (LDPE (LC602A (product name))) at 330°C. Finally, a polyethylene film (50 μm thick) containing an antistatic agent was laminated to this extruded polyethylene layer. The polyethylene film containing the antistatic agent was made of polyethylene (density: 0.920 g / cm³). 3A film was used that was prepared by forming a film from a mixture of 98% by mass of (MFR: 1.9g / 10min) and 2% by mass of an antistatic agent. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Metal particles / Black ink / HDPEF / PE / EVOH-based barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer) In the above, "antistatic PEF" means polyethylene film containing an antistatic agent (the same applies hereafter). Also, "PE" means polyethylene as an adhesive layer (the same applies hereafter). Also, "AC" means anchor coat layer (the same applies hereafter). Also, "HDPEF" means high-density polyethylene film (the same applies hereafter). Also, "milky white PEF" means milky white polyethylene film (the same applies hereafter). Furthermore, "LLDPEF" means linear low-density polyethylene film (the same applies hereafter).

[0110] (Example 2) As an intermediate layer, a milky white polyethylene film is used, made of polyethylene (density: 0.930 g / cm³). 3 The film used was obtained by forming a film from a mixture of 94% by mass of (MFR: 2.1 g / 10 min) and 6.5% by mass of a white pigment (titanium dioxide-based pigment) (MPU Shiroconc 2 (product name), thickness 50 μm), and as the second sealant layer, polyethylene (density: 0.931 g / cm³) was used. 3 The film used was obtained by forming a film with MFR: 2.1 g / 10 min, thickness 50 μm, and as the first sealant layer, polyethylene (density: 0.930 g / cm³) was used. 3 A laminate was prepared in the same manner as in Example 1, except that a film was used that was obtained by forming a film from a mixture of (MFR: 2.1 g / 10 min) 98.5 mass% and 1.5 mass% of an antistatic agent and an antiblocking agent. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Metal particles / Black ink / HDPEF / PE / EVOH-based barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer)

[0111] (Example 3) The laminate was fabricated in the same manner as in Example 1, except that the laminate shown in Figure 2B was prepared, and a uniaxially oriented high-density polyethylene (HDPE) film B (manufactured by Dai Nippon Printing Co., Ltd., MDO HD-13 (product name), thickness 25 μm) was used as the base layer. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / HDPEF / AC / Printing layer / White ink / Metal particles / Black ink / AC / PE / EVOH-based barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer)

[0112] (Example 4) The laminate was fabricated in the same manner as in Example 2, except that the laminate shown in Figure 2B was prepared, and a uniaxially oriented high-density polyethylene (HDPE) film B (manufactured by Dai Nippon Printing Co., Ltd., MDO HD-13 (product name), thickness 25 μm) was used as the base layer. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / HDPEF / AC / Printing layer / White ink / Metal particles / Black ink / AC / PE / EVOH-based barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer)

[0113] (Example 5) The laminate was fabricated in the same manner as in Example 1, except that the laminate shown in Figure 2C was prepared. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Metal particles / HDPEF / Black ink / AC / PE / EVOH barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer)

[0114] (Example 6) The laminate was fabricated in the same manner as in Example 2, except that the laminate shown in Figure 2C was used. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Metal particles / HDPEF / Black ink / AC / PE / EVOH barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer) (Example 7) The laminate was fabricated in the same manner as in Example 2, except that the laminate shown in Figure 2D was used. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printed layer / HDPEF / Black ink / AC / PE / EVOH barrier film / PE / Opal PEF / PE / LLDPEF (Innermost layer)

[0115] (Comparative Example 1) As a base layer, a 1 μm thick patterned print layer was formed by applying and drying a urethane-based gravure ink (manufactured by Toyo Ink) to one surface of a biaxially oriented polyethylene terephthalate (PET) film (manufactured by Toyobo, E5200, 12 μm thick) using gravure printing.

[0116] Next, lamination was performed using the tandem dry lamination method as follows. First, a 3 μm thick adhesive layer was formed on the surface of the printed pattern layer by applying and drying a urethane-based two-component curing adhesive (manufactured by Rock Paint, main component: RU-80, hardener: H-5). Then, an aluminum-deposited biaxially oriented polyethylene terephthalate (PET) film (manufactured by Toray Film Processing, BR-PET1312, thickness 12 μm) was laminated through this adhesive layer. Next, a 3 μm thick adhesive layer was formed on the surface of the aluminum-deposited biaxially oriented polyethylene terephthalate film by applying and drying the above urethane-based two-component curing adhesive. Then, a polyethylene film (polyethylene (density: 0.920 g / cm³)) was laminated as a second sealant layer through this adhesive layer. 3 A film (180 μm thick) obtained by depositing a film with an MFR of 1.9 g / 10 min was laminated together.

[0117] Next, the following lamination process was performed using the single-dry lamination method. First, a 3 μm thick adhesive layer was formed on the surface of the substrate layer by applying and drying the above-mentioned urethane-based two-component curing adhesive. Then, a polyethylene film (50 μm thick) containing an antistatic agent was laminated through this adhesive layer. The polyethylene film containing the antistatic agent was made of polyethylene (density: 0.920 g / cm³). 3 A film was used that was prepared by forming a film from a mixture of 98% by mass of (MFR: 1.9g / 10min) and 2% by mass of an antistatic agent. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / Adhesive / PETF / Printed layer / Adhesive / Aluminum vapor-deposited PETF / Adhesive / PEF (Innermost layer) In the above, "PETF" refers to polyethylene terephthalate film (the same applies hereafter). Also, "aluminum-deposited PETF" refers to polyethylene terephthalate film on which an aluminum vapor-deposited film has been formed (the same applies hereafter).

[0118] (Comparative Example 2) The laminate was prepared in the same manner as in Comparative Example 1, except that a light-shielding layer was provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / Adhesive / PETF / Printed layer / Black ink / Adhesive / Aluminum vapor-deposited PETF / Adhesive / PEF (Innermost layer)

[0119] (Comparative Example 3) A laminate was fabricated in the same manner as in Example 1, except that the light-shielding layer, the first shielding layer, and the second shielding layer were omitted, and the intermediate layer and the barrier layer were swapped. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printed layer / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0120] (Comparative Example 4) A laminate was fabricated in the same manner as in Example 2, except that the light-shielding layer, the first shielding layer, and the second shielding layer were omitted, and the intermediate layer and the barrier layer were swapped. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printed layer / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0121] (Comparative Example 5) A laminate was prepared in the same manner as in Comparative Example 3, except that the pattern printing layer and the base material layer were swapped, and a uniaxially oriented high-density polyethylene (HDPE) film B (manufactured by Dai Nippon Printing Co., Ltd., MDO HD-13 (product name), thickness 25 μm) was used as the base material layer. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / HDPEF / Printed layer / AC / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0122] (Comparative Example 6) A laminate was prepared in the same manner as in Comparative Example 4, except that the pattern printing layer and the base material layer were swapped, and a uniaxially oriented high-density polyethylene (HDPE) film B (manufactured by Dai Nippon Printing Co., Ltd., MDO HD-13 (product name), thickness 25 μm) was used as the base material layer. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / HDPEF / Printed layer / AC / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0123] (Comparative Example 7) A laminate was fabricated in the same manner as in Comparative Example 3, except that one first shielding layer and two second shielding layers were provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Metal particles / White ink / HDPEF / PE / Opal PEF / PE / EVOH-based barrier film / PE / LLDPEF (Innermost layer)

[0124] (Comparative Example 8) A laminate was fabricated in the same manner as in Comparative Example 3, except that two second shielding layers were provided and a gray ink layer (thickness 1 μm) was provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / White ink / Gray ink / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0125] (Comparative Example 9) A laminate was fabricated in the same manner as in Comparative Example 3, except that a light-shielding layer and a second shielding layer were provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / Black ink / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0126] (Comparative Example 10) The laminate was fabricated in the same manner as in Comparative Example 3, except that two second shielding layers were provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / White ink / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0127] (Comparative Example 11) The laminate was fabricated in the same manner as in Comparative Example 3, except that a second shielding layer was provided. The resulting laminate has the following layer structure. (Outermost layer) Antistatic PEF / PE / AC / Printing layer / White ink / HDPEF / PE / Opal PEF / PE / EVOH barrier film / PE / LLDPEF (Innermost layer)

[0128] (Preparation of tube containers) The laminates obtained in the examples and comparative examples were processed into individual pieces of a predetermined width and length using a bobbin cutter, and the ends in the width direction were overlapped so that the overlap width was approximately 1.2 mm. Then, the overlapped ends were heat-sealed to obtain a cylindrical tube. The obtained tube was cut to a predetermined length in the longitudinal direction to produce the body tube of the tube container. The body tube was mounted on a mandrel, and a head member was attached to one end of the body tube using high-density polyethylene (Suntec J345, manufactured by Asahi Kasei, density 0.956 g / cm³). 3 The tube container was formed by compression molding using ( ).

[0129] (Lamination strength) The laminate was cut into strips 15 mm wide, and the lamination strength between the patterned layer and the base material layer was checked. The lamination strength was measured using a tensile testing machine (STA-1150, manufactured by Orientec Co., Ltd.) at a tensile speed of 50 mm / min.

[0130] (Total light transmittance measurement test) From the laminates obtained in the examples and comparative examples, test specimens measuring 30 mm x 50 mm were cut out, and the maximum transmittance of light with a wavelength of 400 nm to 800 nm was measured. The transmittance was measured in accordance with JIS K7361-1:1997. A haze meter (product name "HM-150", manufactured by Murakami Color Technology Laboratory Co., Ltd., measuring diameter 20 mmφ) was used as the measuring instrument. Specifically, the test specimen was placed in the measuring instrument so that no wrinkles were formed on the specimen. At this time, the test specimen was placed in the measuring instrument so that the first sealant layer side was facing the light source side. After holding for 1 minute, the transmittance of the test specimen was measured in an environment with a temperature of 25°C and a relative humidity of 50%.

[0131] (Whiteness measurement test) From the laminates obtained in the examples and comparative examples, the whiteness (brightness (L) of the appearance was determined as an aesthetic feature. *The values ​​were checked. The whiteness of the appearance was measured against a black backing sheet as the background, and the density of the white material was quantified by converting it to reflectance. The measurement was performed using a spectrophotometer (X-rite, eXact (product name)).

[0132] (Monomaterial) The polyethylene content (monomaterial ratio) was calculated from the specific gravity of the materials constituting each layer of the laminates obtained in the examples and comparative examples, and from the thickness of each layer. Specifically, for the laminates obtained in the examples and comparative examples, a determination was made as to whether or not they were monomaterials in accordance with the CEFLEX guidelines (2020). A rating of "A" was given if they conformed to the CEFLEX guidelines (2020), and a rating of "B" was given if they did not.

[0133] The results are shown in Tables 1 and 2.

[0134] [Table 1]

[0135] In the "Laminate Strength" column, "good" means that the laminate could be peeled off and had a peel strength of 2N or more but less than 3N.

[0136] In the "Total Light Transmittance" column, "good" means that the total light transmittance was 3% or less. "Poor" means that the total light transmittance was between 3% and 30%. Furthermore, "bad" means that the total light transmittance was 40% or more.

[0137] In the "Concealment" column, "excellent" means that the presence or absence of contents could not be determined at all. "Good" means that the presence or absence of contents could be determined, but the shape or volume of the contents could not be determined. "Poor" means that the shape and volume of the contents could be determined. Furthermore, "bad" means that the liquid level of the contents could be determined.

[0138] In the "Whiteness" column, "excellent" is L * This means the value was 85 or higher. Also, "good" is L * This means the value was between 65 and 85. Furthermore, "bad" is L * This means the value was less than 65 or was unmeasurable.

[0139] As a result, as shown in Table 1, the laminates according to Examples 1 to 6 showed good results in all items. Therefore, it was found that the laminates according to this embodiment can improve the light-shielding properties and design of the laminate.

[0140] It is also possible to combine the multiple components disclosed in the above embodiment as needed. Alternatively, some components may be removed from all the components shown in the above embodiment. [Explanation of Symbols]

[0141] 10 Laminate 11 Base material layer 12 1st shielding layer 13 Light blocking layer 15. Pattern printing layer 16 Second shielding layer 17 Barrier layer 18 Middle Class 21. First sealant layer 22 Second sealant layer 40 Tube containers 40A Tube container with cap 41 Body tube 42 one end 43 Head component 49 Cap 101 Exterior 102 Inner self

Claims

1. The first sealant layer, the base material layer, and the second sealant layer are laminated in this order from the outer surface to the inner surface. A light-shielding layer is provided between the first sealant layer and the substrate layer. A first shielding layer is provided between the first sealant layer and the light-shielding layer. A second shielding layer is provided between the first sealant layer and the first shielding layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

2. The first sealant layer, the base material layer, and the second sealant layer are laminated in this order from the outer surface to the inner surface. A light-shielding layer is provided between the substrate layer and the second sealant layer. A first shielding layer is provided between the substrate layer and the light-shielding layer. A second shielding layer is provided between the base material layer and the first shielding layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

3. The first sealant layer, the base material layer, and the second sealant layer are laminated in this order from the outer surface to the inner surface. A first shielding layer is provided between the first sealant layer and the substrate layer. A second shielding layer is provided between the first sealant layer and the first shielding layer. A light-shielding layer is provided between the substrate layer and the second sealant layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

4. The first sealant layer, the base material layer, and the second sealant layer are laminated in this order from the outer surface to the inner surface. A light-shielding layer is provided between the substrate layer and the second sealant layer. The first sealant layer contains polyethylene as its main component, The substrate layer is a stretched film containing at least one selected from low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, and high-density polyethylene. The second sealant layer contains polyethylene as its main component, A laminate in which polyethylene accounts for 90% or more by mass.

5. The light-shielding layer contains a black pigment, In the light-shielding layer, the content of the black pigment is 4% or more and 50% or less. The laminate according to claim 1, wherein the light-shielding layer does not contain metal particles, white pigments, or colored pigments.

6. The laminate according to claim 1, wherein the first shielding layer contains metal particles.

7. The second shielding layer contains white ink, The laminate according to claim 1, wherein a pattern printing layer is formed on the outer surface of the second shielding layer.

8. The laminate according to claim 1, wherein the maximum transmittance of light with a wavelength of 400 nm or more and 800 nm or less, as measured in accordance with JIS K7361-1:1997, is less than 3.0%.

9. The laminate according to claim 1, further comprising a barrier layer and an intermediate layer provided between the base material layer and the second sealant layer.

10. The laminate according to claim 1, wherein the base material layer is milky white.

11. The laminate according to claim 2, wherein the substrate layer is transparent.

12. The laminate according to claim 3, wherein the base material layer is milky white.

13. The laminate according to claim 1, wherein the density of the first sealant layer and the density of the second sealant layer are equal to each other.

14. In a tube container, A body tube formed by overlapping and joining opposing edges of a laminate according to any one of claims 1 to 13, A tube container comprising a head member joined to one end of the body tube.

15. The tube container according to claim 14, wherein the head member comprises polyethylene.

16. In a tube container with a cap, The tube container according to claim 14, A capped tube container comprising a cap attached to the head member.

17. The tube container according to claim 16, wherein the cap comprises polyethylene.

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