Metal laminate packaging material, molded container and packaging

Abstract

The present invention is a metal laminate packaging material for forming a container with an opening, the metal laminate packaging material comprising synthetic resin layers laminated on both sides of a metal foil. A metal laminate packaging material (1) comprises a barrier layer (13) made of a metal foil, a thermally adhesive layer (11) that is laminated inside of the barrier layer (13) and forms an inner surface of a container (2), and a protective layer (15) that is laminated outside of the barrier layer (13) and forms an outer surface of the container (2), and the thermally adhesive layer (11) and / or the protective layer (15) contains a biomass-derived resin. The metal laminate packaging material has excellent shielding effects of light, moisture and oxygen and contributes to carbon neutrality.

Description

Metal laminate packaging materials, molded containers, packaging bodies

[0001] The present invention relates to a metal laminate packaging material, the laminate resin of which contains a resin synthesized using raw materials derived from biomass (hereinafter also referred to as biomass-derived resin).

[0002] The present invention also relates to a container made of the metal laminate packaging material and a package including the container as an element, for use in packaging containing food, pharmaceuticals, chemical products, electronic parts, batteries, etc.

[0003] Metal laminate packaging is a laminated film made of a barrier layer made of metal foil with laminate resin layers on both sides, and has excellent blocking properties against light, moisture, oxygen, etc. Among such packaging materials, aluminum laminate packaging, in which the metal foil is made of aluminum foil, is low-cost, lightweight, and strong, and is therefore used as a material for containers for storing contents such as food, pharmaceuticals, chemical products, electronic components, batteries, etc. (hereinafter, the same applies when referring to contents).

[0004] An example of a container made of a metal laminate packaging material is a molded container made by integrally molding the packaging material. As a conventional example of a molded container, Patent Document 1 discloses a container made by molding a metal laminate packaging material made by dry laminating a polyethylene terephthalate film, an aluminum foil, a modified polypropylene film, and a polypropylene film, with the polypropylene film as the innermost surface. Another such molded container is disclosed in Patent Document 2.

[0005] Other examples of containers made of metal laminate packaging material include containers formed by combining a body part made of the same packaging material with a bottom part made of the same packaging material, as disclosed in Patent Document 3.

[0006] Patent No. 2866915 Publication No. 6-47771 Publication No. 2020-11774

[0007] In containers made of metal laminate packaging materials, the weight ratio of metal foil to the total container is high. Therefore, by collecting discarded containers and separating the laminated resin, the metal foil can be reused. However, since the separated laminated resin is difficult to reuse, it is incinerated, but because carbon dioxide is generated, more environmentally friendly measures are required from the perspective of carbon neutrality.

[0008] The present inventors have set a goal of solving the problem of the invention to provide a container made of a metal laminate packaging material that can reduce carbon dioxide emissions when the metal foil is reused after disposal. They have found that this problem can be solved by a metal laminate packaging material having the following configuration, and have completed the present invention.

[0009] That is, the present invention relates to the metal laminate packaging material shown below, a container obtained by using the packaging material, and a package including the container as an element.

[0010] 1) A metal laminate packaging material used to form a container having an opening, a cylindrical body portion hanging down from the periphery of the opening, and a bottom portion surrounded by the lower periphery of the body portion, wherein the packaging material comprises: a barrier layer made of metal foil; a heat-sealing layer made of heat-sealing resin laminated inside the barrier layer and constituting the inner surface of the container; and a protective layer made of film-like synthetic resin laminated inside the barrier layer and constituting the outer surface of the container, wherein the heat-sealing resin and / or the synthetic resin contains a biomass-derived resin.

[0011] 2) The synthetic resin film has a tensile modulus (δ) in the machine direction (MD). 1 (MD) ) is 500MPa to 2500MPa, and the tensile modulus in the transverse direction (TD) (δ 1 (TD) ) is also 500MPa to 2500MPa, and their ratio (δ 1 (MD) / δ 1 (TD)) is 0.9 to 1.1.

[0012] 3) The film-shaped synthetic resin has a tensile strength (δ) at break in the machine direction (MD). 2 (MD) ) is 30MPa to 70MPa, and the tensile strength at break in the transverse direction (TD) (δ 2 (TD) ) is also 30MPa to 70MPa, and their ratio (δ 2 (MD) / δ 2(MD) ) is also 0.9 to 1.1.

[0013] 4) The film-like synthetic resin has a tensile elongation at break (E (MD) ) is 500% to 900%, and the tensile elongation at break in the transverse direction (TD) (E (TD) ) is also 500% to 900%, and their ratio (E (MD ) / E (TD) ) is 0.8 to 1.2.

[0014] 5) The metal laminate packaging material according to any one of 1) to 4), wherein the heat-sealable layer is a multi-layered layer, at least one of which is made of a biomass-derived resin, and the biomass-derived resin is a biomass-derived polyolefin.

[0015] 6) The metal laminate packaging material of 5), characterized in that the biomass-derived polyolefin is at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer.

[0016] 7) The metal laminate packaging material according to any one of 1) to 6), wherein the protective layer is a multi-layered layer, at least one of which is made of a biomass-derived resin, and the biomass-derived resin is a biomass-derived polyester and / or a biomass-derived polyolefin.

[0017] 8) The metal laminate packaging material of 7), characterized in that the biomass-derived polyester is biomass-derived polyethylene terephthalate.

[0018] 9) The metal laminate packaging material of 7), characterized in that the biomass-derived polyolefin is at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer.

[0019] 10) A metal laminate packaging material according to any one of 1) to 9), characterized in that the amount of metal foil used per unit area is 50 to 90% by mass.

[0020] 11) A container having an opening, a cylindrical body hanging down from the periphery of the opening, and a bottom surrounded by the lower periphery of the body, wherein the container is formed by press-molding any one of the metal laminate packaging materials 1) to 10) so that a heat-sealed layer forms the inner surface of the container, and the body and the bottom are continuous and integrated to form the container.

[0021] 12) A container having an opening, a cylindrical body hanging down from the periphery of the opening, and a bottom surrounded by the lower periphery of the body, wherein the body is a cylindrical member made of a body blank made of any one of 1) to 10) of the metal laminate packaging material, and the bottom is a member formed by press-molding a bottom blank made of any one of 1) to 10) of the metal laminate packaging material so that a protective layer of the packaging material forms the outer surface of the container, and the member forming the bottom has an inverted U-shaped cross section made of a horizontal main body and a hanging part extending downward from the outer periphery of the main body.

[0022] 13) A sealed package comprising a lid having a heat-sealing layer on the underside thereof, a container as defined in 11) or 12), and a content, characterized in that the sealing is achieved by heat-sealing the heat-sealing layer forming the underside of the lid with the heat-sealing layer forming the periphery of the opening of the container.

[0023] The metal laminate packaging material (1) has a barrier layer made of metal foil in the middle of its thickness, providing excellent blocking effects against light, moisture, oxygen, etc. Furthermore, this packaging material contributes to carbon neutrality because the heat-sealing layer laminated on the inside of the barrier layer, the protective layer laminated on the inside of the same, or both layers contain biomass-derived resin. In this regard, while fossil resources have limited mining capacity and are feared to be depleted in the future, biomass is derived from resource crops such as sugarcane and rapeseed and can be permanently utilized through cultivation, making it preferable from the perspective of global resource sustainability. Therefore, containers made of the metal laminate packaging material of the present invention and packages incorporating such containers are also desirable products in line with the recent global trend toward environmental conservation. Furthermore, the containers and packages promote the reuse of metal foil, thereby reducing illegal dumping and ultimately reducing environmental risks such as marine pollution caused by microplastics.

[0024] The metal laminate packaging material 2) is a metal laminate packaging material 1), characterized by the mechanical properties of the film-like synthetic resin that forms its protective layer. That is, the tensile modulus of the synthetic resin in both the machine direction (MD) and the cross direction (TD) is limited to a specific range, and the ratio between them is also limited to a specific range. Even when strong stress is applied during press molding, this packaging material does not undergo delamination at the midpoint of the thickness, and the resulting molded product has sufficient height (hereinafter, this effect may be simply referred to as moldability).

[0025] The metal laminate of 3) is characterized by the same mechanical properties as the metal laminate packaging material of 1) or 2) in the film-like synthetic resin that forms the protective layer. That is, the synthetic resin has a tensile strength at break in both the machine direction (MD) and the cross direction (TD) that are both limited to a specified range, and the ratio between them is also limited to a specified range, so it also has good formability.

[0026] The molded container of 4) is a metal laminate packaging material of any one of 1) to 3) and has the same characteristic mechanical properties of the film-like synthetic resin that forms the protective layer. That is, the synthetic resin has a tensile elongation (%) at break in both the machine direction (MD) and the cross direction (TD) that is limited to a specified range, and the ratio between them is also limited to a specified range, so that the moldability is also good.

[0027] The metal laminate packaging material of 5) is a metal laminate packaging material of any of 1) to 4), characterized in that the heat-sealed layer is a multi-layer consisting of two or more independent layers, and at least one layer of the multi-layer is made of a biomass-derived resin, and the biomass-derived resin is a biomass-derived polyolefin, and this packaging material, a molded container made of this packaging material, and a package containing this molded container as an element contribute to carbon neutrality.

[0028] 6) The metal laminate packaging material is the metal laminate packaging material of 5), characterized in that the biomass-derived polyolefin contained in its heat-sealed layer is one or more of polyethylene, ethylene-propylene random copolymer, and ethylene-propylene block copolymer, all of which are derived from biomass; this packaging material, a molded container made from this material, and a package containing this molded container as an element contribute to carbon neutrality.

[0029] The metal laminate packaging material of 7) is a metal laminate packaging material of any of 1) to 6), characterized in that its protective layer is a multi-layer consisting of two or more independent layers, and at least one layer of the multi-layer is made of a biomass-derived resin, and the biomass-derived resin is a biomass-derived polyolefin and / or a biomass-derived polyester, and this packaging material, a molded container made of this packaging material, and a package containing this molded container as an element contribute to carbon neutrality.

[0030] The metal laminate packaging material of 8) is the metal laminate packaging material of 7), in which the biomass-derived polyester forming the protective layer is biomass-derived polyethylene terephthalate. As a result, the packaging material, containers obtained using the packaging material, and packages containing the containers all contribute to carbon neutrality and have good heat resistance and impact resistance.

[0031] The metal laminate packaging material of 9) is the metal laminate packaging material of 8), characterized in that the biomass-derived polyolefin forming its protective layer is one or more of polyethylene, ethylene-propylene random copolymer, and ethylene-propylene block copolymer, all of which are derived from biomass. Therefore, the packaging material, molded containers made from it, and packages using these molded containers as elements all contribute to carbon neutrality.

[0032] Furthermore, because the heat-sealable layers of the metal laminate packaging materials 5) to 9) are multi-layered, they have little thickness variation, meaning that variations in thickness are minimized. Therefore, containers made using these packaging materials have minimal unevenness on the top surface of the opening edge, which results in good heat-sealing properties when a heat-sealable lid is heat-sealed to the opening edge. Furthermore, good heat-sealing properties are also achieved when the edges of the packaging material are overlapped and joined under heat. Therefore, this packaging material allows for a more airtight package.

[0033] Metal laminate packaging material 10) uses a relatively high amount of metal foil per unit area, at 50-80% by mass, which provides excellent barrier properties against gas, light, moisture, etc., and also adequately suppresses corrosion of the metal foil. Therefore, containers made from this packaging material and packaging that incorporates this container are well suited to long-term storage of contents. Furthermore, containers made from this packaging material are classified as metal containers in accordance with the law. In particular, molded containers with a barrier layer made of aluminum foil or aluminum alloy foil can be classified as aluminum containers under the Container Recycling Law, making it easy to reuse the metal foil.

[0034] The container 11) is a one-piece molded container (hereinafter simply referred to as a molded container) made by pressing any of the metal laminate packaging materials 1) to 10), and not only contributes to carbon neutrality, but also provides a package with good heat sealing properties and barrier function, as well as excellent sealing properties.

[0035] The container 12) is a container (hereinafter simply referred to as a combination container) that combines a body made of any of the metal laminate packaging materials 1) to 10) with a bottom made of the same packaging material, and not only contributes to carbon neutrality, but also provides a package that has good heat sealing properties and barrier function, and is excellent in airtightness.

[0036] The packaging body 13) is composed of the molded container 11) or the combined container 12), so it contributes to carbon neutrality and also has good heat sealing, airtightness, and barrier properties, making it suitable for long-term storage of the contents.

[0037] 9 is a cross-sectional view of a metal laminate packaging material of the present invention. (a) is a plan view of a forming blank that provides the formed container of the present invention. (b) is a cross-sectional view of a formed container obtained from the forming blank. (a) is a plan view of a body blank that provides the body of the combined container of the present invention. (b) is a perspective view of the body obtained from the body blank. (a) is a plan view of a bottom blank that provides the bottom of the combined container of the present invention. (b) is a perspective view of the bottom formed from the bottom blank. (c) is a perspective view of a combined container according to the present invention. (d) is a horizontal cross-sectional view showing an enlarged overlapping portion of the body in the combined container of FIG. 5. (e) is a vertical cross-sectional view taken along line VV of the combined container of FIG. 5. In the figure, the portion surrounded by dashed-dotted line A is an enlarged view of the folded portion surrounded by dashed-dotted line a. In addition, the portion surrounded by dashed-dotted line B is an enlarged view of the overlapping portion surrounded by dashed-dotted line b. (f) is a vertical cross-sectional view showing a part of a process for producing the combined container of FIG. 5. (g) is a vertical cross-sectional view showing a part of a process for producing the combined container of the present invention. (h) is a top view of the combined container of FIG. In the same figure, the part surrounded by the dashed dotted line C is an enlarged view of the overlap part surrounded by the dashed dotted line c in the same combined container. Fig. 11 is a perspective view of a package including the molded container of the present invention as an element. Fig. 12 is a partial cross-sectional view of the package of Fig. 11. Fig. 13 is a partial cross-sectional view of a package including the combined container of the present invention as an element.

[0038] Examples of embodiments of the present invention will now be described with reference to the drawings, which do not limit the scope of the present invention.

[0039] <Terminology>

[0040] "Inside" refers to the direction of the heat-sealable layer of the metal laminate packaging material of the present invention, and can be considered to be the direction of the up arrow in each of Figures 1(a), 1(b), 1(c), and 1(d). Furthermore, when a container obtained using the same packaging material is used as the reference, the same direction refers to, for example, the up arrow direction in Figure 2(b), the right arrow direction in Figure 5, the up arrow direction in Figure 6, the right arrow direction in Figure 7, and the down arrow direction in Figure 9.

[0041] "Outside" refers to the direction of the opposite side of the heat-sealing layer on either side of the metal laminate packaging material of the present invention, and can be considered to be the direction of the down arrow in each of Figures 1(a), (b), (c), and (d). Furthermore, when a container obtained using the same packaging material is used as the reference, the same direction refers to, for example, the down arrow direction in Figure 2(b), the left arrow direction in Figure 5, the down arrow direction in Figure 6, the left arrow direction in Figure 7, and the up arrow direction in Figure 9.

[0042] The term "up" refers to the direction toward the opening side of the container of the present invention, with the center of the body of the container as the reference point, for example, the direction of the upward arrow in FIG.

[0043] "Down" refers to the direction opposite the opening of the container, ie, the bottom side, based on the center of the body of the container of the present invention, and refers to the direction of the downward arrow in Figure 7, for example.

[0044] "Biomass" refers to renewable organic resources derived from living organisms. Biomass can be classified into waste biomass, unused biomass, and resource crops depending on its state of existence. Examples of waste biomass include waste paper and construction wood. Examples of unused biomass include various types of straw and forest residues. Resource crops include carbohydrate resources such as sugarcane, starch resources such as corn, and oil and fat resources such as rapeseed.

[0045] The term "biomass-derived resin" refers to a resin synthesized using raw materials derived from the biomass (hereinafter sometimes referred to as "bio-").

[0046] "Fossil resource-derived resin" refers to a resin synthesized using only raw materials derived from fossil resources (hereinafter sometimes identified as fuel-), and is distinguished from biomass-derived resin.

[0047] "Resin" includes one or both of biomass-derived resins and fossil resource-derived resins.

[0048] <Biomass-derived resin>

[0049] Suitable biomass-derived resins include at least one selected from the group consisting of biomass-derived polyolefins (bio-polyolefins), biomass-derived polyesters (bio-polyesters), and biomass-derived polyamides (bio-polyamides).

[0050] Biomass-derived polyolefins (bio-polyolefins) are polymers obtained from biomass-derived olefins (bioolefins). Bioolefins can be obtained by olefinating bioalcohols (bioethanol, bioisopropanol, biobutanol, etc.) obtained from sugar resources of the biomass, for example, using various known methods. Examples include bioethylene, biopropylene, and biobutene. Bioolefins can be used in combination with olefins derived from fossil resources (fuel-olefins). The composition ratio of bioolefins to fuel-olefins in biomass-derived polyolefins is not particularly limited, as long as the bioolefins account for 10% by mass or more of the total olefins, and is determined taking economical factors into consideration. Preferably, the mass ratio of bioolefins to fuel-olefins is, for example, about 10 / 90 to 50 / 50, more preferably about 20 / 80 to 30 / 70. Specific examples of biomass-derived polyolefins include at least one selected from the group consisting of biomass-derived polyethylene (bio-PE), biomass-derived ethylene-propylene random copolymer (bio-rPP), biomass-derived ethylene-propylene block copolymer (bio-bPP), and biomass-derived homopolypropylene (bio-hPP). Among these, taking into account factors such as the energy consumption required from the production of the raw material biomass olefin to the production of the biomass-derived polyolefin, at least one selected from the group consisting of bio-PE, bio-rPP, and bio-bPP is preferred. Biomass-derived polyolefins can be low-, medium-, or high-density, and may be modified with an unsaturated dicarboxylic acid such as maleic anhydride.

[0051] Biomass-derived polyesters are polymers obtained from raw materials such as lactones, polyols, polycarboxylic acids, and hydroxycarboxylic acids. The raw materials may be entirely derived from biomass, or may be a combination of biomass-derived and fossil-derived raw materials. Examples of lactones include β-butyrolactone, δ-valerolactone, and ε-caprolactone. Examples of polyols include aliphatic, alicyclic, and aromatic diols such as ethylene glycol, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, bisphenol A, and bisphenol A-alkylene oxide adducts, as well as tri- and tetraols such as glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, diglycerin, ditrimethylolpropane, and ditrimethylolethane. Examples of polycarboxylic acids include aliphatic, alicyclic, and aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, cyclohexanedicarboxylic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, maleic anhydride, and fumaric acid, as well as tri- and tetracarboxylic acids such as trimellitic acid, trimellitic anhydride, pyromellitic acid, and pyromellitic anhydride. Examples of hydroxycarboxylic acids include p-hydroxybenzoic acid, p-hydroxyethoxybenzoic acid, citric acid, malic acid, and tartaric acid. Specific examples of biomass-derived polyesters include biomass-derived polyethylene terephthalate (bio-PET) and biomass trimethylene terephthalate (bio-PTT), with biomass-derived polyethylene terephthalate (bio-PET) being preferred in terms of strength, heat resistance, and the like. The ethylene glycol (EG) in biomass PET can be made from bioethanol derived from the carbohydrate resources of the biomass, and the terephthalic acid (TPA) can also be made from paraxylene (PX) derived from such carbohydrate resources, as long as either or both of the EG and TPA are derived from biomass.

[0052] Biomass-derived polyamides are polymers obtained from raw materials such as lactones, diamines, and dicarboxylic acids. The raw materials for the polyamides may be entirely biomass-derived, or may be a combination of biomass-derived and fossil-derived raw materials. Examples of biomass-derived polyamides include n-nylon, a polycondensation product of ω-amino acids, and n,m-nylon, a co-condensation reaction product of diamines and dicarboxylic acids. Here, n and m both indicate the carbon numbers of the monomer components. Examples of n-nylons include nylon 6, 11, and 12. Examples of n,m-nylons include nylon 66, 410, 510, 56, 610, 1012, 6T, 6I, and 10T. Examples of lactones include ε-caprolactam, undecane lactam, and lauryllactam. Examples of diamines include hexamethylenediamine. Examples of dicarboxylic acids include adipic acid, sebacic acid, terephthalic acid, and isophthalic acid.

[0053] Other examples of biomass-derived resins include polycarbonate, phenolic resin, and cellulose acetate resin.

[0054] <Fossil resource-derived resin>

[0055] Suitable examples of fossil resource-derived resins include fossil resource-derived polyolefins (fuel-polyolefins), fossil resource-derived polyesters (fuel-polyesters), and fossil resource-derived polyamides (fuel-polyamides).

[0056] Fossil resource-derived polyolefins are polymers obtained solely from olefins derived from fossil resources (fuel-olefins). Specific examples of fossil resource-derived polyolefins include at least one polyolefin selected from the group consisting of fossil resource-derived polyethylene (fuel-PE), fossil resource-derived ethylene-propylene random copolymer (fuel-rPP), fossil resource-derived ethylene-propylene block copolymer (fuel-bPP), and fossil resource-derived homopolypropylene (fuel-hPP). Fossil resource-derived polyolefins can be low-, medium-, or high-density, and may be modified with an unsaturated dicarboxylic acid such as maleic anhydride.

[0057] Fossil-derived polyesters are polymers obtained from raw materials such as lactones, polyols, polycarboxylic acids, and hydroxycarboxylic acids. All of these raw materials are derived from fossil-derived materials. Examples of lactones include β-butyrolactone, δ-valerolactone, and ε-caprolactone. Examples of polyols include aliphatic, alicyclic, and aromatic diols such as ethylene glycol, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, polyethylene glycol, cyclohexanedimethanol, bisphenol A, and bisphenol A-alkylene oxide adducts, as well as tri- and tetraols such as glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, diglycerin, ditrimethylolpropane, and ditrimethylolethane. Examples of polycarboxylic acids include aliphatic, alicyclic, and aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, cyclohexanedicarboxylic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, maleic anhydride, and fumaric acid, as well as tri- and tetracarboxylic acids such as trimellitic acid, trimellitic anhydride, pyromellitic acid, and pyromellitic anhydride. Examples of hydroxycarboxylic acids include p-hydroxybenzoic acid, p-hydroxyethoxybenzoic acid, citric acid, malic acid, and tartaric acid. Specific examples of fossil resource-derived polyesters include fossil resource-derived polyethylene terephthalate (fuel-PET) and fossil resource-derived trimethylene terephthalate (fuel-PTT). Considering strength, heat resistance, and the like, fossil resource-derived polyethylene terephthalate (fuel-PET) is preferred.

[0058] Fossil resource-derived polyamides are polymers obtained from raw materials such as lactones, diamines, and dicarboxylic acids. All of these raw materials are derived from fossil resources. Examples of fossil resource-derived polyamides include n-nylon, a polycondensation product of ω-amino acids, and n,m-nylon, a co-condensation reaction product of diamines and dicarboxylic acids. Here, n and m both indicate the carbon numbers of the monomer components. Examples of n-nylons include nylon 6, 11, and 12. Examples of n,m-nylons include nylon 66, 410, 510, 56, 610, 1012, 6T, 6I, and 10T. Examples of lactones include ε-caprolactam, undecane lactam, and lauryllactam. Examples of diamines include hexamethylenediamine. Examples of dicarboxylic acids include adipic acid, sebacic acid, terephthalic acid, and isophthalic acid.

[0059] Other examples of resins derived from fossil resources include polycarbonate derived from fossil resources and phenolic resins derived from fossil resources.

[0060] <Secondary material>

[0061] Biomass-derived resins and / or fossil resource-derived resins may be combined with various elastomers, tackifiers, waxes, pigments, and other secondary materials. Examples of elastomers include polystyrene-based elastomers and polyolefin-based elastomers. The elastomers may be derived from biomass, fossil resources, or a combination of both. Examples of tackifier resins include rosins such as rosin, disproportionated rosin, hydrogenated rosin, and polymerized rosin, as well as their derivatives (e.g., alcohol esters). Examples of waxes include polyethylene wax, polypropylene wax, and amide wax. Examples of pigments include titanium oxide, zinc oxide, gloss white, pearlite, barium carbonate, calcium carbonate, precipitated silica, aerosil, talc, alumina white, mica, synthetic calcium silicate, magnesium carbonate, barium carbonate, carbon black, magnetite, and red iron oxide.

[0062] <Subject of the present invention>

[0063] The present invention relates to a metal laminate packaging material (1) (hereinafter sometimes abbreviated as packaging material (1)), a container (2), and a package (5). The container (2) is an article obtained by processing the packaging material (1) and has an opening (21), a tubular body (23) hanging down from the periphery of the opening (21), and a bottom (27) surrounded by the lower periphery of the body (23). Here, the term "cylindrical" referring to the shape of the body (23) refers to a hollow body with open ends and surrounded by walls. There are no particular restrictions on its length, cross-sectional shape and area, or dimensional ratio. Furthermore, "cylindrical" includes both containers with a constant cross-sectional shape and area along their length and those with a variable cross-sectional shape and / or area along their length. In this specification, examples of the container (2) include a molded container (2A), a combination container (2B), and a combination container (2C), which will be described later.

[0064] The package (5) is a sealed body consisting of a container (2), a lid (3), and a content (4).

[0065] <Metal laminate packaging>

[0066] The packaging material (1) is a laminated material that includes at least a heat-sealing layer (11), a barrier layer (13), and a protective layer (15), and does not include a paper layer.

[0067] The heat-sealing layer (11) is laminated on the inside of the barrier layer (13) and is made of a heat-sealing resin.

[0068] The heat-sealing layer (11) may be a single layer or multiple layers. A multiple-layer heat-sealing layer (11) consists of at least two independent layers. A two-layer heat-sealing layer (11) consists of a single outermost heat-sealing layer (11a) and a single innermost heat-sealing layer (11c). A three- or more-layer heat-sealing layer (11) consists of a single outermost heat-sealing layer (11a), a single or multiple intermediate heat-sealing layer (11b), and a single innermost heat-sealing layer (11c).

[0069] An adhesive layer (12) may be interposed between the heat-sealing layer (11) and the barrier layer (13).

[0070] An adhesive layer (14) may also be interposed between the barrier layer (13) and the protective layer (15).

[0071] The protective layer (15) is laminated on the inside of the barrier layer (13) and is made of a film-like synthetic resin.

[0072] The protective layer (15) may be a single layer or multiple layers. A multiple layer protective layer (15) consists of at least two independent layers. A two-layer protective layer (15) consists of a single outermost heat-sealable layer (15a) and a single innermost heat-sealable layer (15c). A three or more layer protective layer (15) consists of a single outermost heat-sealable layer (15a), a single or multiple intermediate heat-sealable layer (15b), and a single innermost heat-sealable layer (15c).

[0073] Figure 1 shows an example of a specific embodiment of the packaging material (1) of the present invention. The packaging material (1) in Figure 1(a) is the first embodiment. This embodiment is composed of, from the inside out, a heat-sealing layer (11), an adhesive layer (12) (optional), a barrier layer (13), an adhesive layer (14) (optional), and a protective layer (15).

[0074] The packaging materials (1) in Figures 1(b), (c), and (d) are all modifications of the first embodiment. The packaging material (1) in Figure 1(b) is a second embodiment. In this embodiment, only the heat-sealing layer (11) is multi-layered, consisting of, from the inside, an outermost heat-sealing layer (11a), an intermediate heat-sealing layer (11b), and an innermost heat-sealing layer (11c). The packaging material (1) in Figure 1(c) is a third embodiment. In this embodiment, only the protective layer (15) is multi-layered, consisting, from the inside, of an innermost protective layer (15a), an intermediate protective layer (15b), and an outermost protective layer (15c). The packaging material (1) in Figure 1(d) is a fourth embodiment. In this embodiment, the heat-sealing layer (11) is made up of, from the inside, an outermost heat-sealing layer (11a), an intermediate heat-sealing layer (11b), and an innermost heat-sealing layer (11c), and the protective layer (15) is made up of, from the inside, an innermost protective layer (15a), an intermediate protective layer (15b), and an outermost protective layer (15c).

[0075] The heat-sealable resin constituting the heat-sealable layer (11) and / or the film-shaped synthetic resin constituting the protective layer (15) contain a biomass-derived resin. Three embodiments are listed below. - Embodiment 1: The heat-sealable resin constituting the heat-sealable layer (11) contains a biomass-derived resin, and the synthetic resin constituting the protective layer (15) does not contain a biomass-derived resin. - Embodiment 2: The heat-sealable resin constituting the heat-sealable layer (11) contains a biomass-derived resin, and the synthetic resin constituting the protective layer (15) also contains a biomass-derived resin. - Embodiment 3: The heat-sealable resin constituting the heat-sealable layer (11) does not contain a biomass-derived resin, and the synthetic resin constituting the protective layer (15) contains a biomass-derived resin.

[0076] <Thermal adhesive layer>

[0077] The heat-sealing layer (11) may be a single layer or multiple layers.

[0078] The single-layer heat-sealable layer (11) is composed of a layer made of a heat-sealable resin, and the heat-sealable resin is composed of a biomass-derived resin and / or a fossil resource-derived resin. When the protective layer (15) does not contain a biomass-derived resin, the single-layer heat-sealable layer (11) is composed of a layer made of a biomass-derived resin. The thickness of the single-layer heat-sealable layer (11) is not limited, and is, for example, 25 μm to 500 μm in consideration of heat-sealability. Furthermore, within this thickness range, the resistance to contents is improved, such as by suitably preventing corrosion of the barrier layer (13) by the contents (4) and allowing the contents (4) to be stored for a longer period of time. From the viewpoint of optimizing heat-sealability and content-resistance, the thickness is preferably 30 μm to 400 μm.

[0079] The multi-layered heat-sealable layer (11) is composed of two or more independent layers made of heat-sealable resin, and the heat-sealable resin is made of a biomass-derived resin and / or a fossil resource-derived resin. When the protective layer (15) does not include a biomass-derived resin layer, the multi-layered heat-sealable layer (11) includes a layer made of a biomass-derived resin.

[0080] The multi-layer heat-sealing layer (11) is composed of, from the inside out, an outermost heat-sealing layer (11a), an intermediate heat-sealing layer (11b), and an innermost heat-sealing layer (11c). However, the intermediate heat-sealing layer (11b) is optional and can be omitted. The remaining outermost heat-sealing layer (11a) after omitting the intermediate heat-sealing layer (11b) and the innermost heat-sealing layer (11c) can be considered as a single heat-sealing layer (11). The total thickness of the multi-layer heat-sealing layer (11) is not particularly limited, and is, for example, 25 μm to 500 μm, preferably 30 μm to 400 μm, taking into consideration sealing properties and corrosion of the barrier layer (13) by the contents (4).

[0081] The outermost heat-sealing layer 11a is a single layer that forms the inner surface of the container 2 and the upper surface of the flange 22 of the container 2. The heat sealing of the container 2 is achieved by direct heat fusion between the outermost heat-sealing layer 11a and the heat-sealing layer that forms the underside of the lid 3. The thickness of the outermost heat-sealing layer 11a is not particularly limited and is, for example, 2 μm to 100 μm, preferably 3 μm to 60 μm.

[0082] The intermediate heat-sealing layer (11b) can be defined as the remaining layer of the multi-layer heat-sealing layer (11) excluding the outermost heat-sealing layer (11a) and the innermost heat-sealing layer (11c), and may be a single layer or multiple layers. The intermediate heat-sealing layer (11b) indirectly functions to heat-seal the outermost heat-sealing layer (11a) to the heat-sealing layer forming the underside of the lid (3), acts as a bonding layer between the outermost heat-sealing layer (11a) and the innermost heat-sealing layer (11c), and also functions as a reinforcing layer to increase the overall strength of the heat-sealing layer (11). The number of intermediate heat-sealing layers (11b) is not particularly limited and may be, for example, 1 to 7. The overall thickness of the intermediate heat-sealing layer (11b) is not particularly limited and may be, for example, 15 μm to 160 μm, preferably 20 μm to 64 μm.

[0083] The innermost heat-sealing layer (11c) is the innermost single layer of the multi-layer heat-sealing layer (11), and serves to bond the multi-layer heat-sealing layer (11) to the printing ink layer (optional) and / or the barrier layer (13). The thickness of the innermost heat-sealing layer (11c) is not particularly limited and is, for example, 2 μm to 100 μm, preferably 3 μm to 60 μm.

[0084] The multi-layered heat-sealing layer (11) may be configured such that all of the outermost heat-sealing layer (11a), the intermediate heat-sealing layer (11b) (optional), and the innermost heat-sealing layer (11c) are made of biomass-derived resin, or some layers may be made of biomass-derived resin and other layers may be made of fossil resource-derived resin. Even when the intermediate heat-sealing layer (11b) is multi-layered, some layers may be made of biomass-derived resin and other layers may be made of fossil resource-derived resin. The layer made of biomass-derived resin and the layer made of fossil resource-derived resin may be stacked in any order without any particular limitation.

[0085] Examples of biomass-derived resins that can form the heat-sealable layer 11 include the biomass-derived polyolefins already mentioned above. As the polyolefin, those already mentioned can be used, and in particular, at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer is preferred.

[0086] Examples of fossil resource-derived resins that can be used to form the heat-sealable layer 11 include the fossil resource-derived polyolefins already mentioned above. As the polyolefin, those already mentioned can be used, and in particular, at least one selected from the group consisting of fossil resource-derived polyethylene, fossil resource-derived ethylene-propylene random copolymer, and fossil resource-derived ethylene-propylene block copolymer is preferred.

[0087] The multi-layered heat-sealable layer (11) can be constructed by various known methods such as dry lamination, melt extrusion lamination, heat lamination, gravure coating, etc. These methods may also be combined.

[0088] <Inner adhesive layer>

[0089] By interposing the adhesive layer (12) between the heat-sealing layer (11) and the barrier layer (13), delamination between the two layers can be prevented during the molding and processing of the packaging material (1). Examples of adhesives that can be used for the adhesive layer (12) include vinyl chloride-vinyl acetate copolymer adhesives, polyester adhesives, epoxy adhesives, polyolefin adhesives, and polyurethane adhesives, with polyurethane resin adhesives being preferred. As polyurethane resin adhesives, two-component curing polyurethane resin adhesives are preferred, with two-component curing polyether urethane resin adhesives and / or two-component curing polyester urethane resin adhesives being particularly suitable. The adhesive may also be made from biomass-derived materials. The thickness of the adhesive layer (12) is not particularly limited, and from the viewpoint of preventing delamination, it is, for example, 1 μm to 8 μm, preferably 2 μm to 6 μm.

[0090] <Barrier layer>

[0091] The barrier layer (13) is a layer for protecting the contents (4) of the package (5) from gas, water vapor, light, etc., and is made of metal foil.

[0092] Examples of metal foils include aluminum foil, iron foil, stainless steel foil, copper foil, and nickel foil. Aluminum foil is preferred in terms of barrier function, formability, and cost. Examples of aluminum foil include pure aluminum foil or aluminum alloy foil, with soft materials (O materials) being preferred. Aluminum foils of the A1000 or A8000 series defined by JIS H4160 are particularly suitable. Soft materials such as A8021-O, A8079-O, and A1N30-O are preferred in terms of formability of the formed container (2A) described below, preventing delamination during forming and variations in formed height. Furthermore, the use of hard materials such as A8079-H and A8021-H enhances the overall strength of the container (2), particularly the flange portion (22), thereby suppressing deformation of the flange portion (22) due to unexpected impact. This also improves the overall shape retention of the container (2).

[0093] A primer layer (not shown) made of a predetermined chemical conversion treatment solution can be formed on the inner surface and / or inner surface of the metal foil. The provision of the primer layer prevents delamination between the thermal seal layer (11) and the barrier layer (13) and between the barrier layer (13) and the protective layer (15) during the molding process of the packaging material (1). Examples of the chemical conversion treatment solution include an aqueous-alcoholic solution containing phosphoric acid, a chromium-based compound, a fluorine-based compound, and / or a binder resin. Examples of the chromium-based compound include chromic acid and / or a chromium (III) salt, examples of the fluorine-based compound include a metal salt of fluoride and / or a non-metal salt of fluoride, and examples of the binder resin include at least one resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins. The amount of the chemical conversion treatment solution used is not particularly limited, and the amount of chromium deposited on one side of the metal foil can be, for example, 0.1 mg / m. 2 ~50 mg / m 2 , preferably 2 mg / m 2 ~20 mg / m 2 It is sufficient if the range is such that

[0094] The thickness of the barrier layer (13) is not particularly limited and can be determined taking into consideration the barrier function of the layer (13), prevention of pinholes in the metal foil that may occur during the molding process of the packaging material (1), strength and shape retention of the container (2), etc., and is, for example, 40 μm to 200 μm, preferably 80 μm to 160 μm.

[0095] The amount of metal foil used in the packaging material (1) is not particularly limited, but considering the desired barrier function of the barrier layer (13) and the recyclability of the metal foil, the amount used per unit area of ​​the packaging material (1) is preferably 50% to 90%, preferably 65% ​​to 85%, and more preferably 55% to 80% by mass. Here, "mass basis" refers to the mass ratio of the metal foil per unit area to the mass per unit area of ​​the packaging material (1).

[0096] <Outer adhesive layer>

[0097] By interposing the adhesive layer (14) between the barrier layer (13) and the protective layer (15), delamination between the two layers can be prevented when the packaging material (1) is formed. The adhesive that constitutes the adhesive layer (12) can be used as the adhesive that constitutes the adhesive layer (14), and a two-component curing polyurethane adhesive is particularly suitable. The thickness of the adhesive layer (14) is not particularly limited, but taking into consideration the delamination prevention effect, it is 1 μm to 8 μm, preferably 2 μm to 6 μm.

[0098] <Print layer>

[0099] An identification marking can be formed on the inner surface of the container 2, for example, on the underside of the flange 22 or on the outer surface of the container, by interposing a printing layer (not shown) between the barrier layer 13 or adhesive layer 14 and the protective layer 15. The printing ink is a composition in which a coloring material such as a pigment or dye is dispersed in a vehicle containing a binder resin and an organic solvent, and various known printing inks can be used without any particular restrictions.

[0100] <Protective layer>

[0101] The protective layer (15) may be a single layer or multiple layers.

[0102] The single-layer protective layer (15) is composed of a film-like layer made of synthetic resin, and the synthetic resin is composed of a biomass-derived resin and / or a fossil resource-derived resin. When the heat-sealing layer (11) does not contain a biomass-derived resin, the single-layer protective layer (15) is composed of a layer made of a biomass-derived resin. The thickness of the single-layer protective layer (15) is not particularly limited, and is, for example, 15 μm to 200 μm, preferably 20 μm to 60 μm, taking into consideration the mechanical strength of the container (2) and the package (5) and their respective shape retention when subjected to an impact.

[0103] The multi-layer protective layer (15) is composed of two or more independent layers of film-like synthetic resin, and the synthetic resin is composed of a biomass-derived resin and / or a fossil resource-derived resin. When the heat-sealing layer (11) does not include a biomass-derived resin layer, the multi-layer protective layer (15) includes a layer made of a biomass-derived resin.

[0104] The multi-layer protective layer (15) is composed of, from the inside out, an innermost protective layer (15a), an intermediate protective layer (15b), and an outermost protective layer (15c). However, the intermediate protective layer (15b) is optional and can be omitted. Note that the remaining innermost protective layer (15a) without the intermediate protective layer (15b) and the innermost protective layer (15c) can be considered as a single-layer protective layer (15). The total thickness of the multi-layer protective layer (15) is not particularly limited, and is, for example, 15 μm to 200 μm, preferably 20 μm to 60 μm, taking into consideration corrosion resistance and the like.

[0105] The innermost protective layer 15a is a layer that bonds the barrier layer 13 or the adhesive layer 14 to the protective layer 15. The thickness of the innermost protective layer 15a is not particularly limited and is, for example, 2 μm to 100 μm, preferably 3 μm to 60 μm.

[0106] The intermediate protective layer (15b) can be defined as the remaining layers of the multi-layer protective layer (15) excluding the single-layer innermost protective layer (15a) and the single-layer outermost protective layer (15c). The intermediate protective layer (15b) may be a single layer or multiple layers. The intermediate protective layer (15b) acts as a bonding layer between the innermost protective layer (15a) and the outermost protective layer (15c) and also functions as a reinforcing layer that increases the overall strength of the protective layer (15). The number of layers in the intermediate protective layer (15b) is not particularly limited and may be, for example, 1 to 4. The overall thickness of the intermediate protective layer (15b) is not particularly limited and may be, for example, 15 μm to 160 μm, preferably 20 μm to 64 μm.

[0107] The outermost protective layer 15c is a layer that constitutes the outermost surface of the formed container 2 and the package 5, and directly plays a role in protecting them from impact due to dropping, external force, etc. The thickness of the outermost protective layer 15c is not particularly limited and is, for example, 2 μm to 100 μm, preferably 3 μm to 60 μm.

[0108] The multi-layer protective layer (15) may be made of biomass-derived resin for all of the innermost protective layer (15a), the intermediate protective layer (15b) (optional), and the outermost protective layer (15c), or some layers may be made of biomass-derived resin and other layers may be made of fossil resource-derived resin. Even when the intermediate protective layer (15b) is multi-layered, some layers may be made of biomass-derived resin and other layers may be made of fossil resource-derived resin. In the multi-layer protective layer (15), the layer made of biomass-derived resin and the layer made of fossil resource-derived resin may be stacked in any order without any particular limitation.

[0109] Examples of biomass-derived resins that can form the protective layer (15) include the biomass-derived polyesters and / or biomass-derived polyolefins already described. The polyesters can be those already described. The polyolefins can also be those already described, with at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer being particularly preferred.

[0110] Examples of fossil resource-derived resins that can be used to form the protective layer 15 include the fossil resource-derived polyesters and / or fossil resource-derived polyolefins described above. The polyesters that can be used include those described above. The polyolefin is preferably at least one selected from the group consisting of fossil resource-derived polyethylene, fossil resource-derived ethylene-propylene random copolymers, and fossil resource-derived ethylene-propylene block copolymers.

[0111] The film-like synthetic resin constituting the protective layer 15 may be heat-sealable, whether the layer 15 is a single layer or a multi-layer. The packaging material 1 having the protective layer 15 made of a heat-sealable film-like synthetic resin is useful when producing the combination containers 2B and 2C described below among the containers 2.

[0112] The multi-layer protective layer (15) can be constructed by various known methods such as dry lamination, melt extrusion lamination, heat lamination, gravure coating, etc. These methods may also be combined.

[0113] <Physical properties of film-type synthetic resin>

[0114] The protective layer 15 behaves as follows during the forming of the packaging material 1. For example, when a circular forming blank 10A made of the packaging material 1 is pressed, particularly by deep drawing, to produce a formed container 2A (described later), the portion of the blank 10A to be formed that corresponds to the flange 22 of the formed container 2A is compressed, while the portion that corresponds to the body 23 is stretched. In particular, the portion that corresponds to the curved portion that forms the boundary between the body 23 and the bottom 27 is stretched more. Furthermore, for example, when a circular bottom blank 10C made of packaging material 1 is subjected to press working, particularly deep drawing, to produce combination containers 2B and 2C (described later), the portion of the blank 10C to be formed, which corresponds to the corner between bottom portion 28 of bottom portion 27 and hanging portion 29, is significantly stretched. As a result of this behavior, delamination may occur between protective layer 15 and barrier layer 13 of blanks 10A and 10C.

[0115] In view of the above, it is preferable that the film-like synthetic resin constituting the entire protective layer (15) has the following characteristic feature 1.

[0116] Feature 1: Tensile modulus of elasticity in the machine direction (MD) of film-shaped synthetic resin (δ 1 (MD) ) is limited to 500 MPa to 2500 MPa (preferably 500 MPa to 1000 MPa), and the tensile modulus (δ 1 (TD) ) is also limited to 500 MPa to 2500 MPa (preferably 500 MPa to 1000 MPa), and the ratio of the two tensile strengths (δ 1 (MD) / δ 1 (TD)) is limited to 0.9 to 1.1 (preferably 0.95 to 1.05).

[0117] When the entire protective layer (11) is made of a film-like synthetic resin having the characteristic configuration 1, the formability of the packaging material (1) is improved, thereby preventing delamination between the protective layer (15) and the barrier layer (13) of the packaging material (1). In addition, the formed height of the bottom (27) of the formed container (2A) made of the packaging material (1), which will be described later, can be easily ensured.

[0118] In order to further improve the formability of the packaging material (1), it is preferable that the film-like synthetic resin constituting the protective layer (15) further has the following characteristic feature 2 and / or characteristic feature 3.

[0119] Feature 2: Tensile strength at break in the machine direction (MD) of film-shaped synthetic resin (δ 2 (MD) ) is limited to 30 MPa to 70 MPa (preferably 30 MPa to 50 MPa), and the tensile strength at break in the transverse direction (TD) (δ 2 (TD) ) is also limited to 30 MPa to 70 MPa (preferably 30 MPa to 50 MPa), and the ratio (δ 2 (MD) / δ 2 (TD) ) is limited to 0.9 to 1.1 (preferably 0.95 to 1.05).

[0120] Feature 3: Tensile elongation at break in the machine direction (MD) of film-shaped synthetic resin (E (MD) ) is limited to 500% to 900% (preferably 500% to 800%), and the tensile elongation at break in the transverse direction (TD) (E (TD) ) is also limited to 500% to 900% (preferably 500% to 800%), and the ratio (E (MD) / E (TD) ) is limited to 0.8 to 1.2 (preferably 0.9 to 1.1).

[0121] From the viewpoint of formability, it is highly preferable that the film-like synthetic resin constituting the protective layer (15) has all of the characteristic features 1, 2 and 3.

[0122] The physical properties of characteristic features 1, 2, and 3 are measured values ​​in accordance with JIS K 7161 and JIS K 7127 ("Testing methods for tensile properties of plastics").

[0123] The packaging material (1) can be produced by various known methods, such as dry lamination, melt extrusion lamination, and heat lamination, and these methods may be combined.

[0124] <Container>

[0125] As described above, the container (2) has at least the opening (21), the body (23), and the bottom (27).

[0126] The container (2) includes a forming container (2A), a combination container (2B), and a combination container (2C). Each of these will be explained below in order.

[0127] <Molded container>

[0128] The formed container 2A is an article formed by forming a forming blank 10A made of the packaging material 1, and has an opening 21. It is also an integrated container in which the body 23 and the bottom 27 are continuous. A flange 22 may be formed around the periphery of the opening 21.

[0129] FIG. 2(a) shows one form of a forming blank (10A). Its shape is not particularly limited and may be circular as shown in the figure, or may be polygonal, such as rectangular, although not shown. However, the forming blank (10A) is not essential. When a packaging material (1) of an unspecified shape is directly formed into a formed container (2A), it is sufficient to trim the periphery of the opening (21) of the resulting formed container (2A), and therefore there is no need to consider an independent forming blank (10A). The forming means is not particularly limited and examples include deep drawing and stretch forming.

[0130] FIG. 2(b) is a cross-sectional view of a molded container 2A. The molded container 2A is cup-shaped, with a brim-like flange 22 formed around the periphery of the opening 21. The dimensions and shape of the flange 22 are not particularly limited and can be determined as appropriate, as long as the lid 3 can be heat-sealed to the top surface and the package 5 can be hermetically sealed after heat sealing. For example, as shown in FIGS. 2(b) and 3, the flange 22 may be annular, or, although not shown, may be polygonal. The body 23 of the molded container 2A has a step at the midpoint of its height, and the bottom 27 has a protrusion, but these configurations are optional. Such optional configurations can enhance the mechanical strength and stackability of the molded container 2A.

[0131] <Combination container>

[0132] Both combination containers 2B and 2C are combined containers having a cylindrical body 23 and a bottom 27 joined to the lower periphery of the body 23. A brim-like flange 22 may be formed around the periphery of the opening 21.

[0133] 3(a) is a plan view of a body blank 10B that will provide the body 23. The blank 10B is sector-shaped, but this is merely an example, and the shape can be set depending on the shape of the combined container 2B.

[0134] 3(b) is a perspective view of the body portion 23 obtained from the body portion blank 10B. The body portion 23 is a tapered cylindrical member formed by overlapping and joining both end edges of the sector-shaped body portion blank 10B. Therefore, the body portion 23 has an overlap portion 24B extending along its height direction.

[0135] 4(a) is a plan view of the bottom blank 10C that provides the bottom 27. The blank 10C is circular, but this is merely an example and its shape can be set depending on the shape of the combination container 2B.

[0136] 4(b) is a perspective view of the bottom portion 27 obtained from the bottom portion blank 10C. The bottom portion 27 is a member having a substantially inverted U-shaped cross section, formed by deep drawing, for example, the circular bottom portion blank 10C, and has a circular, horizontal main portion 28 and a hanging portion 29 extending upward from the outer periphery of the main portion 28.

[0137] 5 is a perspective view of the combination container (2B). The container (2B) is cup-shaped, and the body (23) and the bottom (27) are joined together by sealing them.

[0138] 6 is a cross-sectional view of the overlap portion 24B of the body portion 23. The overlap portion 24B is formed by overlapping one edge portion and the other edge portion of the sector-shaped body portion blank 10B.

[0139] The total thickness (T1) of the overlap between the protective layer (15) at one edge of the body blank (10B) and the heat-sealable layer (11) at the other edge in the overlap portion (24B) is not particularly limited, and is, for example, 55 μm to 195 μm. By making this thickness (T1) 55 μm or more, the sealing properties of the overlap portion (24B) can be sufficiently ensured, and by making it less than 195 μm, the barrier properties of the overlap portion (24B) can also be sufficiently ensured. From this perspective, the value of T1 is preferably 60 μm to 190 μm.

[0140] The width (W1) of the overlap portion (24B) is not particularly limited and may be, for example, 2 mm to 10 mm. By making the width (W1) 2 mm or more, the barrier properties and sealing properties of the overlap portion (24B) can be sufficiently ensured. Furthermore, by making the overlap width (W1) less than 10 mm, costs can be reduced and wrinkles in the overlap portion (24B) can be prevented. From these perspectives, the width (W1) is preferably 4 mm to 8 mm.

[0141] FIG. 7 is a cross-sectional view of a combination container (2B). In the figure, the portion of the body (23) surrounded by dashed line A is an enlarged view of the overlap portion (24B) surrounded by dashed line b. In the figure, the edge of the opening (21) at the upper end of the body (23) is provided with a flange portion (22) bent outward. However, the flange portion (22) is optional and may have a shape other than that shown. For example, it may be formed in a flat shape folded in three, or may be curled downward to form a generally arc-shaped cross section. In the figure, the lower edge of the body (23) is formed with a folded portion (25) folded inward, as shown by the portion surrounded by dashed line b. An enlarged view of the folded portion (25) is shown in the portion surrounded by dashed line B.

[0142] The overall manufacturing process of the combination container (2B) will be illustrated below.

[0143] First, a body blank (10B) and a bottom blank (10C) are prepared. The body blank (10B) is obtained by punching a packaging material (1) into a sector shape of a predetermined size, as shown in FIG. 3(a), for example. The bottom blank (10C) is obtained by punching a packaging material (1) into a circle of a predetermined size, as shown in FIG. 4(a), for example. The packaging material (1) constituting the body blank (10B) and the packaging material (1) constituting the bottom blank (10C) are usually the same, but may be made of different materials and / or thicknesses.

[0144] Next, the bottom portion 27 is fabricated. The bottom portion 27 can be obtained by deep-drawing a circular bottom portion blank 10C using a mold (not shown), as shown in FIG. 4(b). The bottom portion 27 in FIG. 4(b) is an inverted U-shaped cross section, consisting of a circular, horizontal main body portion 28 and a hanging portion 29 rising from the periphery of the main body portion 28. The bottom portion 27 is preferably fabricated so as to avoid wrinkles, particularly on the surface of the hanging portion 28. Minimizing wrinkles facilitates integral bonding of the bottom portion 27 and the body portion 23, preventing leakage even when the combined container 2B contains liquid contents 4. The corners between the main body portion 28 and the hanging portion 29 on the outer surface of the bottom portion 27 have a substantially right-angled cross section, but may also be rounded.

[0145] Next, the bottom portion 27 and the body blank 10B are joined together. Specifically, the bottom portion 27 is set on the top surface of a generally truncated cone mold (not shown) so that the upper surface of the main body 28 of the bottom portion 27 overlaps with the top surface of the main body 28. The body blank 10B is then wrapped around the outer periphery of the mold so that both end edges overlap. The heat-sealing layer 11 and the protective layer 15, which form the overlapping surfaces of the both end edges, are then heat-sealed to form the tapered cylindrical body 23.

[0146] FIG. 8 shows the process of forming the flange portion (22) and the folded portion (25).

[0147] The flange portion (22) is formed by curling the upper edge of the body portion (23) outward at the horizontal position of the opening (21) indicated by the dashed two-dot line using a predetermined curl forming die (not shown) and applying pressure in the vertical direction to form a flattened shape folded in half approximately horizontally.

[0148] The folded portion (25) is a portion that assists in joining the body portion (23) and the bottom portion (27), and the joining is achieved by heat fusion. Heat fusion is achieved between the heat fusion layer (11) at the lower end portion (26) of the body portion (23) and the protective layer (15) at the hanging portion (29) of the bottom portion (27), and between the heat fusion layer (11) at the bottom portion (27) and the heat fusion layer (11) at the folded portion (25). However, the folded portion (25) is optional. In this case, the cup-shaped bottom portion (27) is fitted onto the lower edge of the body portion (23), and then heat fusion is achieved between the protective layer (15) at the bottom portion (27) and the heat fusion layer (11) at the body portion (23).

[0149] The heat sealing means is not particularly limited, and examples thereof include heat sealing using a hot plate, high frequency sealing, and ultrasonic sealing.

[0150] The heat-sealing conditions are not particularly limited and may be appropriately determined depending on the type of heat-sealable resin forming the heat-sealable layer 11 of the body blank 10B and the type of film-like synthetic resin forming the protective layer 15. Examples are given below.

[0151] In the case of heat sealing using a hot plate, it is preferable to perform heat sealing by pressing a hot plate set at a temperature approximately 20 to 40°C higher than both the melting point of the heat-sealable resin constituting the heat-sealable layer (11) and the melting point of the film-like synthetic resin (heat-sealable resin) constituting the protective layer (15) against both end edges of the body blank (10B). Specifically, when the heat-sealable layer (11) and the protective layer (15) are both made of unstretched polypropylene (CPP), the melting point of which is generally approximately 160 to 170°C, so the heat-sealing temperature should be approximately 160 to 220°C. When the heat-sealable layer (11) and the protective layer (15) are both made of polyethylene (PE), the melting point of which is generally approximately 115 to 135°C, so the heat-sealing temperature should be approximately 140 to 220°C. Other conditions include a load of approximately 80 to 200 kgf and a sealing time of approximately 1 to 5 seconds.

[0152] In the case of high frequency sealing, the conditions are not particularly limited, but for example, preferred are output: 0.5 to 1.5 kW, sealing time: 3 to 5 seconds, distance from coil: 0.5 to 15 mm, and load: 100 to 200 kgf.

[0153] After joining the bottom portion 27 to the body portion 23 by heat sealing, the lower end portion 26 of the body portion 23 is folded inward to form the folded portion 25. The folded portion 25 is pressed against the hanging portion 29 of the bottom portion 27 using a disk-shaped rotating mold (not shown). Next, the lower end portion of the body portion 23, the folded portion 25, and the hanging portion 29 of the bottom portion 27 are heat sealed together to join the body portion 23 and the bottom portion 27 together. Examples of heat sealing methods include heat sealing using a hot plate or the like, high-frequency sealing, and ultrasonic sealing. The heat sealing conditions can be as described above.

[0154] In order to facilitate the manufacture of the combination container (2B), it is preferable to form the folded portion (25) first and then the flange portion (22).

[0155] Figure 9 is a top view of the body 23 constituting a combined container 2C, illustrating part of the manufacturing process for the container 2C. In the body 23 of Figure 9(a), both end edges of the body blank 10C constituting the body 23 form a seam 24C, which extends in the height direction of the combined container 2C. Furthermore, in the seam 24C, heat fusion is achieved between the heat-sealing layer 11 on one edge and the heat-sealing layer 11 on the other edge. In the body 23 of Figure 9(b), the seam 24C is joined to the outer surface of the body 23 by being folded to one side so that it overlaps the side surface.

[0156] The joining of the gable portion (24C) and the side surface of the body portion (23) can be performed by the above-mentioned heat sealing means, with high-frequency sealing being preferred. The conditions for high-frequency sealing are not particularly limited, and examples include an output of 0.5 to 1.5 kW, a sealing time of 3 to 5 seconds, and a load of 100 to 200 kgf. The distance between the coil of the high-frequency sealing device and the gable portion (24C) should be 0.5 to 15 mm.

[0157] The process of joining the body part (23) and the bottom part (27) of the combination container (2C) is the same as that of the combination container (2B), so the explanation will be omitted.

[0158] 10 is a top view of the combination container 2C. In the figure, an enlarged view of the joint portion 24C surrounded by the dashed line c is shown in the area surrounded by the dashed line C.

[0159] The total thickness (T1) of the inner protective layer (15) at the folded portion (25) on one edge of the body blank (10B) at the gable portion (24C) and the inner heat-sealable layer (11) at the folded portion (25) is not particularly limited and is, for example, 55 μm to 195 μm. By making the thickness (T1) 55 μm or more, the sealing properties of the overlap portion (24B) can be sufficiently ensured, and by making it 195 μm or less, the barrier properties of the overlap portion (24B) can also be sufficiently ensured. From this perspective, the thickness (T1) is preferably 60 μm to 190 μm.

[0160] The width (W1) of the joint portion (24C) is not particularly limited, and is, for example, 5 mm to 20 mm. By making the width (W1) 5 mm or more, the barrier property and sealing property of the overlap portion (24B) can be sufficiently ensured. Furthermore, by making the overlap width (W1) less than 20 mm, costs can be reduced and wrinkles in the overlap portion (24B) can be prevented. From the above perspectives, the width (W1) is preferably 10 mm to 18 mm.

[0161] The shape of the combination containers (2B) and (2C) is not limited to the cup-like shape shown in FIG. 7, but may be a cup-like shape with a relatively small body (23) or a tray-like shape with an even smaller height.

[0162] <Lid>

[0163] The lid (3) is a heat-sealing material for the container (2) and is a film-like material or a film-like lid material processed into a predetermined shape, which is composed of a protective layer (31), a barrier layer (32), and a heat-sealing layer (33) from the inside out. An adhesive layer made of the adhesive may be interposed between the protective layer (31) and the barrier layer (32) and / or between the barrier layer (32) and the heat-sealing layer (33). As with the packaging material (1), the lid (3) also contributes to carbon neutrality during disposal of the package (5) by using biomass-derived resin for part or all of the protective layer (31) and / or the heat-sealing layer (33).

[0164] The protective layer (31) is a layer on the lid (3) that protects the package (5) and its contents (4) from external impacts and is made of various known synthetic resins. The synthetic resin may be any of the biomass-derived resins and / or fossil-derived resins described above that are suitable for a protective layer, with polyester and / or polyolefin being preferred. Polyethylene terephthalate is preferred as the polyester. Polyethylene, polypropylene, ethylene-propylene copolymer (block or random), and homopolypropylene are preferred as the polyolefin. The protective layer (31) may also be made of an overcoat such as soluble nitrocellulose, shellac resin, epoxy resin, urethane resin, chlorinated polyolefin resin, acrylic resin, or vinyl chloride-vinyl acetate copolymer. The protective layer (31) may be a single layer or a multilayer consisting of at least two independent layers. The overall thickness of the protective layer (31) is not particularly limited and may be, for example, 3 μm to 100 μm.

[0165] The barrier layer (32) functions to protect the contents (4) of the package (5) together with the container (2) from light, gas, water vapor, etc. The barrier layer (32) is made of metal foil, and the metal foil constituting the barrier layer (13) can be used. As the metal foil, aluminum foil is particularly preferred, and 1000 series O material or 8000 series O material specified in JIS H4160 is suitable. A base layer made of the treatment liquid may be provided on one or both sides of the metal foil. The thickness of the barrier layer (32) is not particularly limited and is, for example, 15 μm to 200 μm.

[0166] The heat-sealing layer (33) is a layer that is heat-sealed to the heat-sealing layer (11) that forms the upper surface of the periphery of the opening (21) of the container (2) and is made of various known heat-sealing resins. As the heat-sealing resin, any of the biomass-derived resins and / or fossil resource-derived resins described above that has heat-sealing properties can be used as appropriate, with polyolefin being preferred. Suitable polyolefins include polyethylene, polypropylene, ethylene-propylene copolymers (block, random), and homopolypropylene. The heat-sealing layer (33) may be a single layer or may be a multi-layer structure consisting of at least two layers. The overall thickness of the heat-sealing layer (33) is not particularly limited and may be, for example, 10 μm to 50 μm.

[0167] The lid material constituting the lid (3) can be manufactured by various known methods such as dry lamination, melt extrusion lamination, heat lamination, gravure coating, etc. The shape and dimensions of the lid (3) are not particularly limited and can be set appropriately depending on the shape and dimensions of the opening (21) and flange portion (22) of the container (2). As shown in Figure 11, a tear tab (34) may be provided on the periphery of the lid (3).

[0168] <Contents>

[0169] The contents (4) may be food, medicine, chemical products, electronic components, batteries, sanitary products, or other industrial products. Examples of food include cream cheese, butter, jelly, yokan, pudding, miso, curry, pasta sauce, juice, dressing, etc. The shape of the contents (4) is not limited, and may be liquid, semi-solid, or solid.

[0170] <Package>

[0171] The package (5) is a sealed body obtained by placing the contents (4) in the container (2) and then heat-sealing the opening (21) of the container (2) with the lid (3).

[0172] 11 is a perspective view of a package 5 consisting of a lid 3, a molded container 2A, and contents 4. For convenience, part of the lid 3 has been omitted to show the contents 4. In the package 5, the heat-sealing layer 33 of the lid 3 and the heat-sealing layer 11 of the flange 22 are heat-sealed to form an annular heat-sealed zone Y, which seals the package 5. An optional annular opening notch X is formed around the periphery of the upper surface of the flange 22.

[0173] FIG. 12 is a partial cross-sectional view of the package of FIG. 11, showing a heat-sealed zone (Y) between the lid (3) and the flange portion (22), and an annular notch (X) formed on the upper surface of the flange portion (22).

[0174] Figure 13 is a partial cross-sectional view of a package 5 having combination containers 2B and 2C as elements. A heat-sealed zone Y is formed between the lid 3 and the flange 22. The annular notch X is not shown.

[0175] The depth of the opening notch (X) is not particularly limited, and the tip of the notch may reach, for example, between the middle of the thickness of the heat-sealing layer (11) of the flange portion (22) and the upper surface of the barrier layer (13).

[0176] The shape of the heat-sealable zone (Y) is not particularly limited, and may be, for example, an annular shape similar to the flange portion (22). The dimensions are also not particularly limited.

[0177] The packaging (5) can be reused by peeling off the lid (3) from the flange (22) of the container (2). After use, the packaging (5) can be discarded and the container (2) can be recovered and the metal foil can be reclaimed, contributing to resource recycling. Furthermore, since the container (2) uses biomass-derived resin for the heat-sealable layer (11) and / or protective layer (15), the packaging (5) also contributes to carbon neutrality.

[0178] The present invention will be further explained below through examples and comparative examples, but the technical scope of the present invention is not limited thereto.

[0179] (Definition of Abbreviations) rPP: Ethylene-propylene random copolymer bPP: Ethylene-propylene block copolymer CPP: Non-oriented polypropylene

[0180] <Preparation of metal laminate packaging material for molded container (2A)>

[0181] Example 1 A chemical conversion treatment solution (a solution consisting of phosphoric acid, polyacrylic acid, a chromium (III) salt compound, water, and alcohol) was applied to both sides of a 120 μm thick aluminum foil (A8021-O material: JIS H4160) until the chromium deposition amount was 11 mg / m per side. 2 A treated aluminum foil was produced by coating and drying the treated aluminum foil so that the thickness of the barrier layer was 3 μm. A two-component curing polyester polyurethane adhesive was then coated on one side of the barrier layer made of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. A 30 μm thick biomass-derived polyethylene terephthalate (bio-PET) film (using biomass ethylene glycol) was then attached to the adhesive layer to form a protective layer.

[0182] The physical properties of the bio-PET film are as follows: 1 (MD) is 1500MPa, δ 1 (TD) is 1600 MPa, δ 1 (MD) / δ 1 (TD) 0.94 Feature configuration 2: δ 2 (MD) is 64 MPa, δ 2 (TD) is 60 MPa, δ 2 (MD) / δ 2 (TD) 1.07 Feature Configuration 3:E (MD) is 360%, E (TD) is 410%, E (MD) / E (TD) is 0.88

[0183] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. A 300 μm thick CPP film (bio-rPP) was then attached to this adhesive layer to form a heat-sealed layer, thereby producing a laminate. This laminate was then aged at 40°C for 8 days to produce aluminum laminate packaging material A. The amount of aluminum foil used per unit area of ​​packaging material A was 51.0% by mass.

[0184] Example 2 A two-component curing polyester polyurethane adhesive was applied to one side of the same treated aluminum foil as in Example 1 and dried to form a 3 μm thick adhesive layer. Subsequently, a 30 μm thick three-layer co-extruded biomass-derived polypropylene (bio-PP) film (bio-rPP (4.5 μm) / fuel-rPP layer (21 μm) / bio-rPP layer (4.5 μm)) was attached to this adhesive layer to form a protective layer.

[0185] The physical properties of the bio-PP film are as follows: 1 (MD) is 520 MPa, δ 1 (TD) is 510 MPa, δ 1 (MD) / δ 1 (TD) 1.02 Feature Configuration 2:δ 2 (MD) is 40 MPa, δ 2 (TD) is 39 MPa, δ 2 (MD) / δ 2 (TD) 1.03 Feature Configuration 3:E (MD) is 660%, E (TD) is 680%, E (MD) / E (TD) is 0.97

[0186] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. A 300 μm thick CPP film (bio-rPP) was then attached to this adhesive layer to form a heat-sealed layer, thereby producing a laminate. This laminate was then aged at 40°C for 8 days to produce aluminum laminate packaging material B. The amount of aluminum foil used per unit area of ​​packaging material B was 51.6% by mass.

[0187] Example 3 A two-component curing polyester polyurethane adhesive was applied to one side of the same treated aluminum foil as in Example 1 and dried to form a 3 μm thick adhesive layer. Next, a 35 μm thick biomass-derived polyethylene terephthalate (bio-PET) film (using biomass ethylene glycol) was attached to this adhesive layer to form a protective layer.

[0188] The physical properties of the bio-PET film are as follows: 1 (MD) is 1650 MPa, δ 1 (TD) is 1700 MPa, δ 1 (MD) / δ 1 (TD) is 0.97 Feature configuration 2: δ 2 (MD) is 70 MPa, δ 2 (TD) is 65 MPa, δ 2 (MD) / δ 2 (TD) 1.08 Feature Configuration 3:E (MD) is 420%, E (TD) is 450%, E (MD) / E (TD) is 0.93

[0189] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil to form a 3 μm thick adhesive layer. Next, a 300 μm thick four-layer co-extruded biomass-derived resin film (bio-PE (30 μm) / bio-rPP (120 μm) / fuel-PP (30 μm) / bio-rPP (120 μm)) was attached to this adhesive layer from the bio-rPP layer side to form a heat-sealed layer, thereby producing a laminate. Next, this laminate was aged at 40°C for 8 days to produce aluminum laminate packaging material C. The amount of aluminum foil used per unit area of ​​packaging material C was 50.4% by mass.

[0190] Example 4 A two-component curing polyester polyurethane adhesive was applied to one side of the same treated aluminum foil as in Example 1 and dried to form a 3 μm thick adhesive layer. Next, a 30 μm thick three-layer co-extruded biomass-derived polypropylene film (bio-rPP (3 μm) / fuel-rPP layer (24 μm) / bio-rPP layer (3 μm)) was attached to this adhesive layer to form a protective layer.

[0191] The physical properties of bio-rPP are as follows: 1 (MD) is 540 MPa, δ 1 (TD) is 518 MPa, δ 1 (MD) / δ 1 (TD) is 1.04 Feature Configuration 2:δ 2 (MD) is 43 MPa, δ 2 (TD) is 42 MPa, δ 2 (MD) / δ 2 (TD) 1.02 Feature Configuration 3:E (MD) is 620%, E (TD) is 680%, E (MD) / E (TD) is 0.91

[0192] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. Next, a 300 μm thick four-layer coextruded film (bio-PE (30 μm) / bio-rPP (120 μm) / fuel-PP (30 μm) / bio-rPP (120 μm)) was attached to this adhesive layer from the bio-rPP layer side to form a heat-sealed layer, thereby producing a laminate. Next, this laminate was aged at 40 ° C for 8 days to produce aluminum laminate packaging material D. The amount of aluminum foil used per unit area of ​​packaging material D was 51.6% by mass.

[0193] Comparative Example 1 A two-component curing polyester polyurethane adhesive was applied to one side of the same treated aluminum foil as in Example 1 and dried to form a 3 μm thick adhesive layer. Next, a 25 μm thick fossil resource-derived polyethylene terephthalate (fuel-PET) film was attached to this adhesive layer to form a protective layer.

[0194] The physical properties of this PET film are as follows: 1 (MD) is 3750MPa, δ 1 (TD) is 3880MPa, δ 1 (MD) / δ 1 (TD) is 0.97 Feature configuration 2: δ 2 (MD) is 220 MPa, δ 2 (TD) is 230 MPa, δ 2 (MD) / δ 2 (TD) is 0.96 Feature Configuration 3:E (MD) is 92%, E (TD) is 75%, E (MD) / E (TD) is 1.23

[0195] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil to form a 3 μm thick adhesive layer. Next, a 300 μm thick four-layer co-extruded fossil resource-derived resin film (fuel-PE (30 μm) / fuel-rPP (120 μm) / fuel-PP (30 μm) / fuel-rPP (120 μm)) was attached to this adhesive layer from the fuel-rPP layer side to form a heat-sealed layer, thereby producing a laminate. Next, this laminate was aged at 40 ° C for 8 days to produce aluminum laminate packaging material E. The amount of aluminum foil used per unit area of ​​packaging material E was 50.4% by mass.

[0196] <Preparation of molded containers> Using a molding tester manufactured by Amada Co., Ltd., packaging material A was set in a mold consisting of male and female molds of specified dimensions and deep-drawn at four different drawing depths to obtain four types of cup-shaped molded containers A. Each container A has a circular opening, a ring-shaped flange similar in shape to the opening that extends horizontally around the periphery of the opening, and an inversely tapered body and a circular bottom.

[0197] The dimensions of the formed container A are as follows: Opening diameter: 61 mm Flange width: 6 mm Body height (drawing depth): 35 mm, 30 mm, 25 mm, 20 mm Bottom diameter: 53 mm

[0198] For packaging materials B, C, D and E, four types of molded containers B, C, D and E were produced using the same method with the same dimensions and shapes.

[0199] <Verification of moldability> Each of the four types of molded containers A to E obtained was (1) examined in a darkroom using a light transmission method for the presence or absence of cracks or pinholes, and (2) visually examined for the presence or absence of delamination in the flanges and edges.

[0200] The formability of formed containers A to E in terms of drawing depth was evaluated by applying the results of (1) above to the following criteria. The results are shown in Table 1. The numbers in parentheses indicate the deepest drawing depth at which no cracks or pinholes occurred among the four levels of drawing depth. "Excellent": No cracks or pinholes occurred at a drawing depth of 30 mm or more and 35 mm or less "Good": No cracks or pinholes occurred at a drawing depth of 25 mm or more and less than 30 mm "Poor": No cracks or pinholes occurred at a drawing depth of less than 25 mm

[0201] Furthermore, the formability of the formed containers A to E with respect to delamination was evaluated by applying the results of (2) above to the following criteria. The results are shown in Table 1. "Excellent": No delamination occurred at a drawing depth of 30 mm or more and 35 mm or less "Good": No delamination occurred at a drawing depth of 25 mm or more and less than 30 mm "Poor": No delamination occurred at a drawing depth of less than 25 mm

[0202] <Production of Lid> A two-component curing polyester polyurethane adhesive was applied to one side of a 20 μm thick aluminum foil (A8021-O: JIS H4160) and dried to form a 3 μm thick adhesive layer. A 12 μm thick biomass-derived polyethylene terephthalate (bio-PET) film was then attached to this adhesive layer to form a protective layer. A two-component curing polyester polyurethane adhesive was then applied to the other side of the aluminum foil and dried to form a 3 μm thick adhesive layer. A 30 μm thick biomass-derived unstretched polypropylene film (bio-rPP) was then attached to this adhesive layer to form a heat-sealed layer, thereby producing a lid material. This lid material was then cut to approximately the same dimensions and shape as the flange portion of the molded container A to produce lid A. A tear tab was provided on a portion of the periphery of lid A.

[0203] <Creating packaging>

[0204] 30 ml of water was placed in each of molded containers A to E, each with a body height of 25 mm, and lid A was placed on top of the flange. A circular heat sealer (made of stainless steel: outer diameter 76 mm, inner diameter 63 mm) heated to 200°C was then pressed against the containers A to E at 150 kgf for 3 seconds to heat-seal the lid A to the containers A to E, thereby producing sealed packages A to E.

[0205] <Verification of Sealing Property> Next, each of the packages A to E was shaken up and down 30 times, and then the presence or absence of water leakage was checked, and the sealing property of the packages A to E was evaluated according to the following criteria. The results are shown in Table 1. "○": Water leakage present "×": No water leakage present

[0206] <Production of metal laminate packaging material for combination containers>

[0207] Example 5 The chemical conversion treatment solution used in Example 1 was applied to both sides of a 100 μm thick aluminum foil (A8021-O material: JIS H4160) so that the chromium deposition amount was 10 mg / m per side. 2 A treated aluminum foil was produced by coating and drying the treated aluminum foil so that the thickness of the barrier layer was 3 μm. Next, a two-component curing polyester polyurethane adhesive was coated on one side of the barrier layer made of this treated aluminum foil and dried to form a 3 μm thick adhesive layer. Next, a 40 μm thick three-layer co-extruded biomass-derived unstretched polypropylene (bio-PP) film (bio-rPP (4 μm) / fuel-bPP (32 μm) / bio-rPP (4 μm)) was attached to this adhesive layer to form a protective layer. This polypropylene film is heat-sealable.

[0208] The physical properties of the bio-PP film are as follows: 1 (MD) is 580 MPa, δ 1 (TD) is 560 MPa, δ 1 (MD) / δ 1 (TD) is 1.04 Feature Configuration 2:δ 2 (MD) is 45 MPa, δ 2 (TD) is 44 MPa, δ 2(MD) / δ 2 (TD) 1.02 Feature Configuration 3:E (MD) is 770%, E (TD) is 790%, E (MD) / E (TD) is 0.97

[0209] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. A 40 μm thick three-layer co-extruded biomass-derived unstretched polypropylene film (bio-rPP (4 μm) / fuel-bPP (32 μm) / bio-rP (4 μm)) was then attached to this adhesive layer to form a heat-sealed layer, thereby producing a laminate. This laminate was then aged at 40 ° C for 8 days to produce aluminum laminate packaging material F. The amount of aluminum foil used per unit area of ​​packaging material F was 77.7% by mass.

[0210] Example 6: A two-component curing polyester polyurethane adhesive was applied to one side of the same treated aluminum foil as used in Example 5 and dried to form a 3 μm thick adhesive layer. Next, a 40 μm thick biomass-derived linear low-density polyethylene film (bio-PE) was attached to this adhesive layer to form a protective layer. This polyethylene film is heat-sealable.

[0211] The physical properties of the bio-PE film are as follows: 1 (MD) is 500 MPa, δ 1 (TD) is 550MPa, δ 1 (MD) / δ 1 (TD) is 0.91 Feature configuration 2: δ 2 (MD) is 35 MPa, δ 2 (TD) is 32 MPa, δ 2 (MD) / δ 2 (TD) 1.09 Feature Configuration 3:E (MD)is 680%, E (TD) is 630%, E (MD) / E (TD) is 1.08

[0212] Next, a two-component curing polyester polyurethane adhesive was applied to the other side of the treated aluminum foil and dried to form a 3 μm thick adhesive layer. A 40 μm thick biomass-derived linear low-density polyethylene film (bio-PE) was then attached to this adhesive layer to form a heat-sealed layer, thereby producing a laminate. This laminate was then aged at 40 °C for 8 days to produce aluminum laminate packaging material G. The amount of aluminum foil used per unit area of ​​packaging material G was 76.9% by mass.

[0213] <Production of combined container> Packaging material F was punched into a predetermined shape to produce a sector-shaped body blank as shown in Fig. 3(a) and a circular bottom blank as shown in Fig. 4(a) (see Fig. 4(a)). Next, the bottom blank was used to produce a cup-shaped bottom as shown in Fig. 4(b). Next, the bottom and the body blank were used to produce a cup-shaped combined container F1 as shown in Fig. 5 according to the manufacturing method for the formed container (2B) described above. This container F1 has an overlap portion formed on the side of the body that extends in the height direction.

[0214] The overlapping portion was heat-sealed using a linear hot plate under the conditions of a sealing temperature of 200° C., a load of 150 kgf, and a sealing time of 3 seconds.

[0215] The dimensions of the combined container F1 are as follows: Container height: 95 mm Opening diameter: 65 mm Flange width: 4 mm Bottom outer diameter (inner diameter of the lower body): 50 mm Bottom hanging part height: 5 mm Leg (folded part) height: 6 mm Body overlap width (overlap): 8 mm Overlap thickness T1: 65 μm

[0216] Additionally, a body blank and a bottom blank for the combined container F1 were separately prepared, and using these blanks, a cup-shaped combined container F2 as shown in Figure 10 was produced according to the manufacturing method for the formed container (2C) described above. This container F2 has a gable portion formed on the side of the body that extends in the height direction.

[0217] The dimensions of the combined container F2 are as follows: Container height: 95 mm Opening diameter: 65 mm Flange width: 4 mm Bottom outer diameter (inner diameter of the lower body): 50 mm Bottom hanging part height: 5 mm Leg (folded part) height: 6 mm Body joint width (overlap): 8 mm Overlap thickness T1: 70 μm

[0218] The joints were heat-sealed using a linear hot plate under the following conditions: sealing temperature: 200°C, load: 150 kgf, and sealing time: 3 seconds. Furthermore, the joints of the body and the outer surface of the body were heat-sealed using high-frequency sealing under the following conditions: output: 1.0 kW, sealing time: 3 seconds, distance from the coil: 5 mm, and load: 150 kgf.

[0219] For packaging material G, a combination container G1 with an overlap portion and a combination container G2 with a gable portion were prepared in the same manner as for packaging material F. The dimensions of container G1 were set to be the same as those of combination container F1. The dimensions of container G2 were also set to be the same as those of combination container F2. The overlap portion of combination container G1 and the gable portion of combination container G2 were heat-sealed using a linear hot plate under conditions of a sealing temperature of 180°C, a load of 150 kgf, and a sealing time of 3 seconds. In addition, the gable portion of combination container G2 was heat-sealed to the outer surface of the body using high-frequency sealing under conditions of an output of 1.0 kW, a sealing time of 3 seconds, a distance from the coil of 5 mm, and a load of 150 kgf.

[0220] <Verification of moldability> In a darkroom, the combination container F1 was held 30 cm below a light source (30W incandescent bulb) to check for pinholes at the bottom, but none were found. It was also confirmed that the combination containers F2, G1, and G2 also had no pinholes at the bottom. Furthermore, the combination containers F1, F2, G1, and G2 were visually checked for the occurrence of delamination, but no delamination was found in any of them.

[0221] <Preparation of Package> Package F1 was prepared by pouring 30 ml of water into combination container F1 and then heat-sealing lid A to the top of the flange of container F1. Heat sealing was performed using a circular heat sealer (made of stainless steel: outer diameter 75 mm, inner diameter 65 mm) under conditions of a sealing temperature of 200°C, a load of 150 kgf, and a sealing time of 3 seconds. Packages F2, G1, and G2 were prepared in the same manner for combination containers F2, G1, and G2.

[0222] <Verification of Sealing Property> After each of the packages F1, F2, G1 and G2 was shaken vertically 30 times, the presence or absence of water leakage was visually checked, and the sealing property of the packages A to E was evaluated according to the following criteria. The results are shown in Table 1. "○": Water leakage present "×": No water leakage present

[0223] Industrial application fields

[0224] The metal laminate packaging material of the present invention contains a biomass-derived resin in its laminate resin layer, and both the molded container made of this packaging material and the packaging body containing this molded container as an element contribute to carbon neutrality, making it a desirable product that is in line with the current global trend toward environmental conservation.

[0225] (1) Metal laminate packaging material: (10A) Metal laminate packaging material for forming blank (10B) Metal laminate packaging material for body blank (10C) Metal laminate packaging material for bottom blank (11) Heat-sealed layer (11a) Outermost heat-sealed layer (11b) Middle heat-sealed layer (11c) Innermost heat-sealed layer (12) Adhesive layer (13) Barrier layer (14) Adhesive layer (15) Protective layer (15a) Innermost protective layer (15b) Middle protective layer (15c) Outermost protective layer (2) Container (2A) Formed container (2B) Combination container (2C) Combination container (21) Opening (22) Flange (23) Body (24B) Overlap (24C) Seam (25) Folded portion (26) Bottom end (27) Bottom (28) Body (29) Hanging portion (X) Opening notch (3) Lid (31) Protective layer (32) Barrier layer (33) Heat seal layer (34) Tear tab (4) Contents (5) Package (Y) Heat seal zone

Claims

1. A metal laminate packaging material used to form a container having an opening, a tubular body portion hanging down from a periphery of the opening, and a bottom portion surrounded by the lower periphery of the body portion, the packaging material comprising: a barrier layer made of metal foil; a heat-sealing layer made of a heat-sealing resin laminated inside the barrier layer and constituting the inner surface of the container; and a protective layer made of a film-like synthetic resin laminated inside the barrier layer and constituting the outer surface of the container, wherein the heat-sealing resin and / or the synthetic resin contains a biomass-derived resin.

2. The synthetic resin film has a tensile modulus (δ 1 (MD) ) is 500MPa to 2500MPa, and the tensile modulus in the transverse direction (TD) (δ 1 (TD) ) is also 500MPa to 2500MPa, and their ratio (δ 1 (MD) / δ 1 (TD) 2. The metal laminate packaging material according to claim 1, wherein the ratio of the thickness of the laminate to the thickness of the packaging material is 0.9 to 1.

1.

3. The synthetic resin film has a tensile strength at break in the machine direction (MD) (δ 2 (MD) ) is 30MPa to 70MPa, and the tensile strength at break in the transverse direction (TD) (δ 2 (TD) ) is also 30MPa to 70MPa, and their ratio (δ 2 (MD) / δ 2(MD) 3. The metal laminate packaging material according to claim 1, wherein the coefficient of friction (T) is 0.9 to 1.

1.

4. The synthetic resin film has a tensile elongation (E (MD) ) is 500% to 900%, and the tensile elongation at break in the transverse direction (TD) (E (TD) ) is also 500% to 900%, and their ratio (E (MD ) / E (TD) 4. The metal laminate packaging material according to claim 1, wherein the coefficient of friction is 0.8 to 1.

2.

5. The metal laminate packaging material of any one of claims 1 to 4, wherein the heat-sealing layer is a multi-layered layer, at least one of which is made of a biomass-derived resin, and this biomass-derived resin is a biomass-derived polyolefin.

6. The metal laminate packaging material according to claim 5, characterized in that the biomass-derived polyolefin is at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer.

7. The metal laminate packaging material of any one of claims 1 to 6, wherein the protective layer is a multi-layered layer, at least one of which is made of a biomass-derived resin, and the biomass-derived resin is a biomass-derived polyester and / or a biomass-derived polyolefin.

8. The metal laminate packaging material according to claim 7, characterized in that the biomass-derived polyester is biomass-derived polyethylene terephthalate.

9. The metal laminate packaging material according to claim 7, characterized in that the biomass-derived polyolefin is at least one selected from the group consisting of biomass-derived polyethylene, biomass-derived ethylene-propylene random copolymer, and biomass-derived ethylene-propylene block copolymer.

10. A metal laminate packaging material according to any one of claims 1 to 9, characterized in that the amount of metal foil used per unit area is 50 to 90% by mass.

11. A container having an opening, a cylindrical body portion hanging down from the periphery of the opening, and a bottom portion surrounded by the lower periphery of the body portion, wherein the container is formed by press-molding a metal laminate packaging material according to any one of claims 1 to 10 so that a heat-sealed layer forms the inner surface of the container, and the body portion and the bottom portion are continuous and integrated to form the container.

12. A container having an opening, a cylindrical body portion hanging down from the periphery of the opening, and a bottom portion surrounded by the lower periphery of the body portion, wherein the body portion is a cylindrical member formed from a body portion blank made of any one of the metal laminate packaging material of claims 1 to 10, and the bottom portion is a member formed by press-molding a bottom portion blank made of any one of the metal laminate packaging material of claims 1 to 10 so that a protective layer of the packaging material forms the outer surface of the container, and the member forming the bottom portion has an inverted U-shaped cross section consisting of a horizontal main body portion and a hanging portion extending downward from the outer periphery of the main body portion.

13. A sealed package comprising a lid having a heat-sealing layer on its underside, a container as defined in claim 11 or 12, and a content, characterized in that the sealing is effected by heat-sealing the heat-sealing layer forming the underside of the lid with a heat-sealing layer forming the periphery of the opening of the container.