WO2024185515A1 - 積層体およびそれを用いた包装体 - Google Patents

積層体およびそれを用いた包装体 Download PDF

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Publication number
WO2024185515A1
WO2024185515A1 PCT/JP2024/006308 JP2024006308W WO2024185515A1 WO 2024185515 A1 WO2024185515 A1 WO 2024185515A1 JP 2024006308 W JP2024006308 W JP 2024006308W WO 2024185515 A1 WO2024185515 A1 WO 2024185515A1
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WIPO (PCT)
Prior art keywords
aluminum foil
laminate
mass
aluminum
resin
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Ceased
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PCT/JP2024/006308
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English (en)
French (fr)
Japanese (ja)
Inventor
翔 合志
健吾 田
直樹 東
享 新宮
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Toyo Aluminum KK
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Toyo Aluminum KK
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Priority to JP2025505211A priority Critical patent/JPWO2024185515A1/ja
Publication of WO2024185515A1 publication Critical patent/WO2024185515A1/ja
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

  • the present invention relates to a laminate, and in particular to a laminate having a resin layer on at least one of the front and back surfaces of an aluminum foil, and a package using the same.
  • aluminum foil or aluminum alloy foil with resin laminated on both sides has been widely used as a laminate for food, medicine, etc., in applications that require high barrier properties to protect the contents from external environments such as oxygen, water vapor, and ultraviolet rays.
  • resin is laminated or coated on one side of the aluminum foil.
  • Patent Documents 1 to 3 disclose methods for separating the resin layer and the aluminum foil by dissolving at least a portion of the aluminum foil.
  • Patent Document 4 proposes a laminate in which the same resin layers are laminated together without containing metal foil.
  • Patent Documents 1 to 3 the use of hazardous substances such as sodium hydroxide (NaOH), nitric acid (HNO 3 ), and hydrochloric acid (HCl) is essential as a solution for separating the aluminum foil, and there is a problem that the environmental load is large when considering the handling of the solution and the treatment of the waste liquid after use in separation, and it cannot be easily applied.
  • the technique described in Patent Document 4 has a problem that the barrier property is inferior to that of a laminate containing a metal foil, and it cannot be used as a substitute for a laminate containing a metal foil such as an aluminum foil.
  • the present invention aims to provide a laminate that contains aluminum foil but is easily recyclable.
  • a laminate having a resin layer on at least one of the front and back surfaces of an aluminum foil containing Al, Fe, Ni, and Zn, characterized in that, when the contents of Fe, Ni, and Zn in the aluminum foil are [Fe], [Ni], and [Zn], respectively, in mass%, [Zn] is 0.4 to 5.1, [Fe] + [Ni] is 0.4 to 4.8, and [Fe] + [Ni] + 2 ⁇ [Zn] is 2.5 or more.
  • the aluminum foil may also have a resin layer on both the front and back surfaces.
  • aluminum foil is a foil whose main component is aluminum.
  • Aluminum foil also includes aluminum alloy foil.
  • the laminate of the present invention exhibits high solubility in an aqueous solution containing an acid and an ionic chloride because the laminated aluminum foil has the above-mentioned composition. Therefore, after use, the laminate of the present invention can be immersed in an aqueous solution containing an acid and an ionic chloride as described above, thereby dissolving the aluminum foil in contact with the resin layer and easily separating the resin layer without using hazardous substances that are difficult to handle, and as a result, it becomes possible to easily separate and recover only the resin layer from the laminate containing the aluminum foil.
  • the aluminum foil used in the laminate of the present invention is more soluble than ordinary aluminum foil, so even when sodium hydroxide, nitric acid, hydrochloric acid, etc. are used, the amount of the acid used and the immersion time can be reduced, further improving handling during recycling. In other words, even though the laminate of the present invention has aluminum foil to achieve high barrier properties, the resin layer alone can be easily separated, achieving a high level of recyclability.
  • the thickness of the aluminum foil is 5 ⁇ m or more and 100 ⁇ m or less.
  • the resin layer laminated on the aluminum foil has thermal adhesive properties.
  • the resin layer laminated on the aluminum foil is preferably formed from two or more different resin layers.
  • the resin layer may be a resin film layer made of a resin film or the like, or a resin coat layer formed by applying or printing a resin coating agent or ink.
  • a resin film layer made of a resin film or the like
  • a resin coat layer formed by applying or printing a resin coating agent or ink.
  • the resin layer on at least one side is formed from two or more different resin layers.
  • the laminate of the present invention it is possible to obtain a laminate formed into a sheet, bag or container shape that has high barrier properties, shape retention and metallic luster due to the presence of aluminum foil, and is easily recyclable.
  • the laminate of the present invention and the packaging product using it use aluminum foil with a specific composition, which allows it to have high barrier properties, shape retention, and metallic luster while also being highly recyclable.
  • 1 is an SEM photograph ( ⁇ 1000 magnification) of an aluminum foil surface of foil A4 in which the area occupancy rate of second phase particles having an equivalent circle diameter of 0.1 ⁇ m or more is 6.38%.
  • 1 is an SEM photograph ( ⁇ 1000 magnification) of the aluminum foil surface of foil A12 in which the area occupancy rate of second phase particles having an equivalent circle diameter of 3.0 ⁇ m or more is 1.69%.
  • 1 is an SEM photograph ( ⁇ 1000 magnification) of the surface of aluminum foil B6 in which the area occupancy rate of second phase particles having an equivalent circle diameter of 0.1 ⁇ m or more is 3.85%.
  • FIG. 1 is an SEM photograph ( ⁇ 1000 magnification) of the surface of aluminum foil B9 in which the area occupancy rate of second phase particles having an equivalent circle diameter of 3.0 ⁇ m or more is 7.55%.
  • FIG. 1 is a scatter plot showing the relationship between ([Fe]+[Ni]+2 ⁇ [Zn]) and chemical solubility in a weak acid environment (labeled “weak acid solubility” in the figure).
  • the laminate is a material having a resin layer on at least one of the front and back surfaces of an aluminum foil.
  • the laminate is used as a packaging material in which a resin is laminated on an aluminum foil to form a package such as a bag, tube, container, or lid, and its shape and size are not particularly limited.
  • a release aluminum foil used for food and electronic material applications it is used as an aluminum laminate coated with a release resin.
  • one side of the aluminum foil may be exposed and the opposite side may be reinforced with a resin sheet or the like.
  • the laminate is generally in the form of a sheet, which can be formed into a laminate by performing a molding process or a lamination process such as heat sealing.
  • design can be imparted by forming the aluminum foil or adding a number of linear lines.
  • the laminate of the present invention has a resin layer on at least one side of the aluminum foil, which protects the aluminum foil, gives it strength that is resistant to tearing, and can impart functions such as heat sealability and adhesion prevention.
  • the aluminum foil used in the present invention may have a resin layer on at least one side, and may have an adhesive, paper, nonwoven fabric, anchor coat, etc. between the aluminum foil and the resin layer.
  • the resin layer may further have a printing layer, OP varnish layer, adhesive, paper, nonwoven fabric, anchor coat, etc. on the side opposite to the side in contact with the aluminum foil.
  • the laminate of the present invention is characterized in that it has a resin layer on at least one of the front and back surfaces of an aluminum foil containing Al, Fe, Ni, and Zn, and when the contents of Fe, Ni, and Zn in the aluminum foil are [Fe], [Ni], and [Zn], respectively, in mass%, [Zn] is 0.4 to 5.1, [Fe] + [Ni] is 0.4 to 4.8, and [Fe] + [Ni] + 2 ⁇ [Zn] is 2.5 or more.
  • the aluminum foil is a foil mainly composed of aluminum.
  • the aluminum foil also includes an aluminum alloy foil.
  • the aluminum foil has high barrier properties regardless of the composition. That is, if the material has an aluminum foil, high barrier properties are ensured.
  • the aluminum foil used in the present invention contains iron (Fe), nickel (Ni) and zinc (Zn), with the remainder being aluminum (Al) and unavoidable impurities.
  • the aluminum foil may contain unavoidable impurities to the extent that they do not impair the chemical solubility in an acidic environment containing a weak acid or the manufacturing suitability of the aluminum foil.
  • the inevitable impurities consist of one or more elements selected from the group consisting of silicon (Si), manganese (Mn), magnesium (Mg), copper (Cu), indium (In), tin (Sn), sodium (Na), vanadium (V), titanium (Ti), zirconium (Zr), chromium (Cr), boron (B), gallium (Ga), bismuth (Bi), lead (Pb), antimony (Sb), and arsenic (As).
  • the content of aluminum (Al) contained in the aluminum foil is preferably 89.0 mass% or more.
  • the Fe-containing second phase particles act as cathode sites that are more noble in potential than the aluminum matrix, improving the chemical solubility of the aluminum foil in an acidic environment that contains a weak acid.
  • the Fe content exceeds 3.1% by mass, the material strength increases due to precipitation strengthening, and defects such as cracked edges occur, hindering rolling workability. Furthermore, coarse second phase particles are likely to be formed during casting, which hinders rolling workability and causes defects such as pinholes in the process of manufacturing aluminum foil with a thickness of 10 ⁇ m or less.
  • the lower limit of the Fe content is not particularly limited, but is usually about 0.0001% by mass. In order to reduce the Fe content to less than 0.0001% by mass, it is necessary to repeat the three-layer electrolysis method, which significantly increases the manufacturing cost.
  • the Fe content in the aluminum foil is preferably 0.0001% by mass or more and 3.1% by mass or less, more preferably 0.0001% by mass or more and 1.8% by mass or less, and even more preferably 0.0001% by mass or more and 1.5% by mass or less.
  • Ni Nickel (Ni)>
  • a certain amount of Ni is added to aluminum, it forms Al-Ni second phase particles and/or Al-Fe-Ni second phase particles together with Fe.
  • the Ni-containing second phase particles have a large potential difference with the aluminum matrix, and increase the effect as a cathode site. Therefore, adding Ni to aluminum improves the chemical solubility of the aluminum foil in an acidic environment containing a weak acid.
  • Ni content exceeds 3.0% by mass, the material strength increases due to precipitation strengthening, and defects such as cracked edges occur, hindering rolling workability. Furthermore, coarse second phase particles are likely to be formed during casting, which hinders rolling workability and causes defects such as pinholes in the process of manufacturing aluminum foil with a thickness of 10 ⁇ m or less.
  • the lower limit of the Ni content is not particularly limited, but is usually about 0.0001% by mass. In order to reduce the Ni content to less than 0.0001% by mass, it is necessary to repeat the three-layer electrolysis method, which significantly increases the manufacturing cost.
  • the Ni content in the aluminum foil is preferably 0.0001% by mass or more and 3.0% by mass or less, more preferably 0.0001% by mass or more and 2.6% by mass or less, and even more preferably 0.0001% by mass or more and 1.8% by mass or less.
  • ⁇ Zinc (Zn)> When a certain amount of Zn is added to aluminum, most of it dissolves in the aluminum matrix, making the potential of the aluminum matrix less noble, which increases the potential difference between the Al-Fe, Al-Ni and/or Al-Fe-Ni second phase particles and the aluminum matrix, improving the chemical solubility of the aluminum foil in an acidic environment containing a weak acid.
  • the Zn content in the aluminum foil is preferably 0.4 mass% or more and 5.1 mass% or less, more preferably 0.5 mass% or more and 2.9 mass% or less, and even more preferably 0.75 mass% or more and 2.1 mass% or less.
  • Adding a certain amount of Fe or Ni to aluminum forms second phase particles of Al-Fe system, Al-Ni system and/or Al-Fe-Ni system. These second phase particles are particularly likely to form in the aluminum matrix. Since the potential difference with the phase is large and the effect as a cathode site is increased, the chemical solubility of the aluminum foil in an acidic environment containing a weak acid is improved.
  • [Fe] + [Ni] is preferably 0.4 to 4.8, more preferably 0.9 to 4.0, and even more preferably 1.4 to 2.9.
  • Adding a certain amount of Fe or Ni to aluminum forms second phase particles of Al-Fe system, Al-Ni system and/or Al-Fe-Ni system. These second phase particles are particularly likely to form in the aluminum matrix. Since the potential difference with the phase is large and the effect as a cathode site is increased, the chemical solubility of the aluminum foil in an acidic environment containing a weak acid is improved.
  • [Fe] + [Ni] + 2 x [Zn] is preferably 2.5 or more, more preferably 2.85 or more, and even more preferably 2.95 or more.
  • ⁇ Zn solid solution amount> The more Zn present in the solid solution state in the aluminum parent phase, the more base the potential of the aluminum parent phase becomes, improving the chemical solubility of the aluminum foil in an acidic environment containing a weak acid.
  • the chemical solubility allows the resin layer and the aluminum foil to be peeled off cleanly.
  • the amount of Zn in solid solution in the aluminum parent phase is preferably 0.3% by mass or more and 4.1% by mass or less, more preferably 0.4% by mass or more and 2.7% by mass or less, and even more preferably 0.5% by mass or more and 1.5% by mass or less.
  • the aluminum foil may contain one or more elements selected from the group consisting of Si, Mn, Mg, Cu, In, Sn, Na, V, Ti, Zr, Cr, B, Ga, Bi, Pb, Sb and As as inevitable impurities.
  • the total content of the one or more elements is preferably 0.6% by mass or less.
  • the content of Mn in the aluminum foil is preferably 0.4% by mass or less
  • the content of Mg is preferably 0.4% by mass or less
  • the content of each of the above elements other than Mn and Mg contained as inevitable impurities in the aluminum foil is preferably 0.2% by mass or less.
  • the lower limit of the Si content is not particularly limited, but is usually around 0.0001% by mass. In order to reduce the Si content to less than 0.0001% by mass, it becomes necessary to repeat the three-layer electrolysis method, which significantly increases the manufacturing cost. Therefore, the Si content in the aluminum foil is preferably 0.0001% by mass or more and 0.2% by mass or less, more preferably 0.0001% by mass or more and 0.15% by mass or less, and even more preferably 0.0001% by mass or more and 0.1% by mass or less.
  • ⁇ Mn> When a certain amount of Mn is added to aluminum, most of it dissolves in the aluminum matrix, but some of it forms second phase particles such as Al-Mn-based, Al-Mn-Ni-based, Al-Mn-Si-based, Al-Mn-Fe-Ni-based, Al-Mn-Fe-Ni-based, Al-Mn-Ni-Si-based, Al-Mn-Si-Fe-based, or Al-Mn-Fe-Ni-Si-based together with Al-Mn, Fe, Ni, and Si.
  • second phase particles such as Al-Mn-based, Al-Mn-Ni-based, Al-Mn-Si-based, Al-Mn-Fe-Ni-based, Al-Mn-Ni-Si-Fe-based, or Al-Mn-Fe-Ni-Si-based together with Al-Mn, Fe, Ni, and Si.
  • the Mn content in the second phase particles and the amount of Mn dissolved in the aluminum matrix increase, and the potential of the second phase particles approaches the potential of the aluminum matrix, reducing the effect of the second phase particles as a cathode site. This reduces the chemical solubility of the aluminum foil in an acidic environment containing a weak acid.
  • the lower limit of the Mn content is not particularly limited, but is usually around 0.0001% by mass. In order to reduce the Mn content to less than 0.0001% by mass, it becomes necessary to repeat the three-layer electrolysis method, which significantly increases the manufacturing cost. Therefore, the Mn content in the aluminum foil is preferably 0.0001% by mass or more and 0.4% by mass or less, more preferably 0.0001% by mass or more and 0.2% by mass or less, and even more preferably 0.0001% by mass or more and 0.1% by mass or less.
  • Mg> When a certain amount of Mg is added to aluminum, a part of it dissolves in the aluminum parent phase. When the Mg content exceeds 0.4 mass%, Mg is concentrated in the oxide film formed on the surface of the aluminum material, and the oxide film is likely to have defects. Such defects in the oxide film can cause delamination at the bonding interface of a laminate in which an aluminum foil and a resin film are laminated. In addition, the addition of Mg has the effect of reducing the chemical solubility of the aluminum foil.
  • the lower limit of the Mg content is not particularly limited, but is usually around 0.0001% by mass. In order to reduce the Mg content to less than 0.0001% by mass, it becomes necessary to repeat the three-layer electrolysis method, which significantly increases the manufacturing cost. Therefore, the Mg content in the aluminum foil is preferably 0.0001% to 0.4% by mass, more preferably 0.0001% to 0.2% by mass, and even more preferably 0.0001% to 0.1% by mass.
  • ⁇ Cu> When a certain amount of Cu is added to aluminum, a part of it dissolves in the aluminum matrix. If the Cu content exceeds 0.2 mass%, the amount of Cu dissolved in the aluminum matrix increases, and the material strength increases due to solid solution strengthening, which may impair rolling workability.
  • the lower limit of the Cu content is not particularly limited, but is usually around 0.0001% by mass. In order to reduce the Cu content to less than 0.0001% by mass, it is necessary to repeat the fractional crystallization method in addition to the three-layer electrolysis method, which significantly increases the manufacturing cost. Therefore, the Cu content in the aluminum foil is preferably 0.0001% to 0.2% by mass, more preferably 0.0001% to 0.15% by mass, and even more preferably 0.0001% to 0.1% by mass.
  • the In content in the aluminum foil is preferably 0.0001% by mass or more and 0.2% by mass or less, and the Sn content is preferably 0.0001% by mass or more and 0.2% by mass or less.
  • Second-phase particles are Al-Fe, Al-Ni, and/or Al-Fe-Ni, etc. These second-phase particles have a large potential difference with the aluminum matrix and act as cathode sites. This improves the chemical solubility of the aluminum foil in an acidic environment containing a weak acid.
  • the area occupancy rate of second-phase particles with a circular equivalent diameter of 0.1 ⁇ m or more distributed on the surface of the aluminum foil falls below 1.7%, the effect as a cathode site will not be sufficient, and the chemical solubility of the aluminum foil in an acidic environment containing a weak acid will be insufficient. Therefore, on the surface of the aluminum foil, the area occupancy rate of second-phase particles with a circular equivalent diameter of 0.1 ⁇ m or more is preferably 1.7% or more, more preferably 4.1% or more, and even more preferably 5.6% or more.
  • Second-phase particles are Al-Fe, Al-Ni and/or Al-Fe-Ni type second-phase particles, and coarse second-phase particles having an equivalent circle diameter of 3.0 ⁇ m or more impair the rolling workability.
  • the area occupancy rate of second-phase particles with an equivalent circle diameter of 3.0 ⁇ m or more distributed on the surface of aluminum foil is preferably 2.0% or less, more preferably 0.8% or less, and even more preferably 0.5% or less.
  • the thickness of the aluminum foil used in the present invention is not particularly limited as long as it has the above composition and can be set arbitrarily, but is preferably 5 ⁇ m to 100 ⁇ m, and more preferably 7 ⁇ m to 65 ⁇ m.
  • the aluminum foil is thick, there are fewer pinholes and tears during molding in the laminate with the resin film, which is preferable. If the aluminum foil is too thicker than 100 ⁇ m, the rigidity becomes too large and the flexibility of the laminate becomes poor, so that there is a risk of uneven heat sealing occurring due to one-sided contact, etc. If it is too thin, pinholes may easily occur in the aluminum foil, and the function as a laminate may be reduced.
  • casting and rolling may be performed according to a conventional method.
  • heat treatment may be performed appropriately for the purpose of homogenizing the aluminum foil.
  • the resin layer is a layer made of a resin formed (laminated) on at least one of the front and back surfaces of the aluminum foil.
  • the resin layer may be formed (laminated) on both the front and back surfaces of the aluminum foil.
  • each of the resin layers may be a single layer, but may have a multi-layer structure in which a plurality of resin layers are laminated.
  • the resin layer formed on one side of the aluminum foil may be the same as or different from the resin layer formed on the other side.
  • the resin layer applied to the present invention may be a layer made of a resin film or a layer made of a resin coat.
  • the type of resin layer can be appropriately selected depending on the performance required for the laminate, such as printability, strength, and heat sealability.
  • the resin layer has thermal adhesive properties. When the resin layer has thermal adhesive properties, it becomes easy to form it into a packaging material by processing such as heat sealing.
  • the resin layer is formed from two or more resin layers.
  • the other layers it becomes possible for the other layers to compensate for properties that cannot be achieved by a single layer alone.
  • the resin layer may be made of a known resin material, and is not particularly limited.
  • known printing inks made of one or more resins selected from, for example, epoxy, nitrocellulose, polyvinyl butyral, phenolic resin, maleic acid resin, alkyd resin, chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer resin, acrylic resin, modified olefin resin, etc. may be used.
  • known adhesives made of one or more resins selected from, for example, polyurethane adhesives, epoxy adhesives, acrylic adhesives, polypropylene adhesives, polyester adhesives, vinyl chloride adhesives, vinyl chloride-vinyl acetate copolymer adhesives, modified olefin adhesives, etc. may be used.
  • known resin films made of one or more resins selected from, for example, polyethylene, polypropylene, polyester, polyamide (nylon), (meth)acrylic, polyvinyl chloride, polystyrene, polyvinylidene chloride, ethylene-vinyl acetate copolymer saponified product, polyvinyl alcohol, polycarbonate, polyvinyl acetate, acetal, etc. may be used.
  • the resins constituting each resin layer may be the same or different.
  • those capable of exhibiting thermal adhesiveness are polyurethane resin, polypropylene resin, polyester resin, vinyl chloride resin, chlorinated polypropylene resin, vinyl chloride-vinyl acetate copolymer resin, acrylic resin, modified olefin resin, ethylene-vinyl acetate copolymer, and polycarbonate resin.
  • forming (laminated) a resin layer capable of exhibiting thermal adhesiveness on at least one side of the aluminum foil makes it possible to easily form the package by processing such as heat sealing.
  • adhesion and lamination methods When laminating a resin film to aluminum foil, a wide variety of known adhesion and lamination methods can be used as a method for adhering the two together, and there are no particular limitations. Specific examples include the dry lamination method using a two-component curing adhesive such as a polyester urethane or polyester adhesive, the co-extrusion method, the extrusion coating method, the extrusion lamination method, the heat sealing method, or the heat lamination method using an anchor coating agent.
  • a two-component curing adhesive such as a polyester urethane or polyester adhesive
  • Any known method can be used to form a resin coating layer on the aluminum foil, including, for example, roll coating, various gravure coatings, doctor blade coating, comma coater, spray coating, brush coating, spin coating, bar coating, flow coating, dip coating, and die coating, or a combination of two or more of the above coating methods. Furthermore, after coating, a heat treatment for drying or reaction may be performed.
  • a resin coating layer examples include surface treatment methods such as ion plasma treatment, ion plating treatment, sputtering treatment, vapor deposition treatment, and plating treatment, or a surface treatment method that combines two or more of the above surface treatment methods may be used. Furthermore, a lamination method for a resin coating layer that combines one or more of the above coating methods with one or more of the above surface treatment methods may be used.
  • suitable resin coating layers to be laminated onto the aluminum foil include those that have been subjected to plasma treatment, surface modification using fatty acids or silane coupling agents, or those that have been modified using acids and/or alkalis, but are not particularly limited.
  • the packaging body of the present invention may be used as a packaging sheet such as a lid material, may be formed into a container or the like and used as a bag, or may be used in a three-dimensional shape with a portion folded like a building material.
  • the packaging of the present invention does not have to be formed only from the laminate of the present invention, and may be used in combination with other packaging materials, such as by laminating it to other packaging materials.
  • the packaging of the present invention is not particularly limited in shape or form as a bag, and may be any shape or form, such as a two-sided bag, three-sided bag, pillow bag (palm-shaped bag), gusset bag, bottom gusset bag, pouch (standing pouch) bag, stand-up zipper bag, side seal bag, bottom seal bag, etc.
  • the method for producing aluminum foil used in the present invention contains Al, Fe, Ni and Zn, with the balance being inevitable impurities, and the contents of Fe, Ni and Zn are [Fe], [Ni] and [Zn], respectively, in mass%.
  • [Zn] is 0.4 to 5.1
  • [Fe] + [Ni] is 0.4 to 4.8
  • [Fe] + [Ni] + 2 ⁇ [Zn] is 2.5 or more.
  • the method is characterized by including a step of rolling a casting (hereinafter also referred to as an “ingot”).
  • An ingot having the above composition can be obtained, for example, by melting aluminum ingot, and adding Fe or Al-Fe mother alloy, Ni or Al-Ni mother alloy, and Zn or Al-Zn mother alloy to adjust the composition of the molten metal, and then casting and solidifying the molten metal.
  • the casting method There are no particular limitations on the casting method, and known methods such as semi-continuous casting, continuous casting, and mold casting can be used.
  • the resulting ingot may be subjected to heat treatment for the purpose of homogenization.
  • the homogenization heat treatment is preferably performed under conditions of a heating temperature of 400°C or higher and 630°C or lower, and a heating time of 1 hour or higher and 20 hours or lower.
  • the rolling method can be any widely known rolling method and is not particularly limited. However, from the viewpoint of making it easier to adjust the thickness of the aluminum foil, it is preferable to provide a cold rolling process after the hot rolling process. Furthermore, the number of hot rollings in the hot rolling process and the number of cold rollings in the cold rolling process may be appropriately set according to the target final thickness of the aluminum foil.
  • intermediate annealing When cold rolling is performed multiple times in the cold rolling process, it is preferable to perform intermediate annealing. In this case, it is preferable to perform the cold rolling process in the following order: one or more cold rollings, intermediate annealing, and one or more cold rollings. It is preferable to perform intermediate annealing under conditions of an annealing temperature of 50°C or higher and 500°C or lower, and an annealing time of 1 second or higher and 20 hours or lower. By performing intermediate annealing, it becomes possible to easily adjust the thickness of the aluminum foil.
  • a heat treatment process may be performed at a temperature of 50°C to 450°C for 1 second to 50 hours.
  • the laminate of the present invention is a laminate having a resin film layer and/or a resin coating layer formed on at least one of the front and back surfaces.
  • a resin film layer and/or a resin coating layer formed on at least one of the front and back surfaces.
  • the aluminum foil used in the present invention has excellent chemical solubility, so even if a laminate is formed by laminating a resin film layer and/or a resin coat layer on an aluminum foil, the aluminum foil layer dissolves from the end face of the laminate when immersed in an acidic solution containing a weak acid, and the resin film layer and/or the resin coat layer can be easily separated from the aluminum foil layer and recycled, etc.
  • the number of resin film layers and resin coat layers laminated on the aluminum foil and the order of lamination can be set appropriately depending on the intended use of the laminate, and there are no particular limitations.
  • the thickness of the entire laminate is preferably 7 ⁇ m or more from the viewpoint of strength, and preferably 565 ⁇ m or less from the viewpoint of weight reduction, and more preferably 10 ⁇ m or more and 200 ⁇ m or less when both viewpoints are taken into consideration.
  • Aluminum foil ⁇ ⁇ (1) Preparation of aluminum foil> Each aluminum composition having the composition shown in Tables 1 and 2 was melted and cast at a cooling rate of 1° C./sec or more and 15° C./sec or less by a mold casting method to obtain an aluminum ingot. The obtained aluminum ingot was then heat treated at 530° C. for 5 hours. Then, cold rolling was performed multiple times to a thickness of 50 ⁇ m to produce aluminum foils A1 to 45 shown in Table 1 and aluminum foils B1 to 16 shown in Table 2.
  • the area occupancy rate of the second phase particles on each sample surface was measured using a backscattered electron image obtained by observing each sample surface with a field emission scanning electron microscope (FE-SEM). Specifically, 10 rectangular fields randomly selected from the backscattered electron images of each sample surface were observed. The range of each rectangular field was a rectangular field of 0.01069 mm2 (119.4 ⁇ m ⁇ 89.5 ⁇ m).
  • the backscattered electron images of each rectangular field were binarized under the condition of brightness of 100 to 255 using image processing software (Mitani Shoji Co., Ltd.: WinROOF2021) to extract second phase particles with a circle equivalent diameter of 0.1 ⁇ m or more and second phase particles with a circle equivalent diameter of 3.0 ⁇ m or more.
  • the area occupancy rate of the second phase particles in the measurement surface was calculated using the image processing software described above, and the average value of the above calculation results obtained from 10 rectangular fields of view was taken as the area occupancy rate of the second phase particles.
  • Figure 1A shows, as an example of SEM photographs before binarization, an SEM photograph of the aluminum foil surface of foil A4, in which the area occupancy of second phase particles with a circle-equivalent diameter of 0.1 ⁇ m or more is 6.38%
  • Figure 1B shows an SEM photograph of the aluminum foil surface of foil A12, in which the area occupancy of second phase particles with a circle-equivalent diameter of 3.0 ⁇ m or more is 1.69%.
  • Figure 2A shows an SEM photograph of the aluminum foil surface of foil B6, in which the area occupancy of second phase particles with a circle-equivalent diameter of 0.1 ⁇ m or more is 3.85%
  • Figure 2B shows an SEM photograph of the aluminum foil surface of foil B9, in which the area occupancy of second phase particles with a circle-equivalent diameter of 3.0 ⁇ m or more is 7.55%.
  • test piece was immersed in an aqueous solution containing 3% by mass sodium chloride and 3% by mass acetic acid at 40 ° C for 2700 seconds, and the mass before and after immersion was measured to calculate the dissolution loss per unit surface area of each test piece.
  • the test pieces with a dissolution loss per unit surface area of 2.8 ⁇ g / mm 2 or more were evaluated as having sufficient chemical solubility. The results are shown in Tables 1 and 2.
  • the rolling workability of the aluminum foil was evaluated by the following method. That is, in the cold rolling process, when the ingots (cast bodies) of each aluminum having the composition shown in Tables 1 and 2 were cold rolled to a predetermined thickness, the rolling workability of the sample (aluminum foil) in which the reduction in material width due to edge cracking was less than 3% of the material width before the start of cold rolling was evaluated as "A”, the rolling workability of the sample in which the reduction in material width due to edge cracking was 3% or more and less than 10% was evaluated as "B”, the rolling workability of the sample in which the reduction in material width was 10% or more and less than 25% was evaluated as "C”, and the rolling workability of the sample in which the reduction in material width was 25% or more was evaluated as "F”. The results are shown in Tables 1 and 2.
  • the amount of Zn dissolved in the aluminum foil was measured by the following method. That is, 0.1 g of a sample was taken from each aluminum foil in Tables 1 and 2, and only the aluminum parent phase in the aluminum foil was dissolved with phenol, and the second phase particles were collected by filtering with a membrane filter (H100A047A, manufactured by Toyo Roshi Kaisha, Ltd.) having a pore size of 0.1 ⁇ m. The second phase particles were dissolved with acid and alkali, and the amount of Zn precipitated was determined using an inductively coupled plasma emission spectrometer (ICPS-8100, manufactured by Shimadzu Corporation). The amount of Zn dissolved in the aluminum foil was determined by subtracting the amount of Zn precipitated from the Zn content of the entire aluminum foil. The results are shown in Table 3.
  • each aluminum foil in Tables 1 and 2 was cut into a size of 15 mm x 17 mm, and as a pretreatment, it was immersed in a 1% by mass sodium hydroxide solution at 35°C for 15 seconds, and then immersed in a 30% by mass nitric acid solution at 25°C for 30 seconds to prepare a test piece.
  • the potential was measured using a corrosion cell VM1 manufactured by EC Frontier Co., Ltd.
  • the electrode potential was measured by a three-electrode method using a 25°C, pH 5.5, 5 mass% NaCl aqueous solution as the test solution, a platinum-plated titanium rod (counter electrode VM1-5 manufactured by EC Frontier Co., Ltd.) as the counter electrode, an Ag/AgCl reference electrode RE-1A manufactured by EC Frontier Co., Ltd. as the reference electrode, and a sample holder VM1-3 manufactured by EC Frontier Co., Ltd. as the working electrode sample holder.
  • the sample holder has a circular sample window with an area of 1 cm2 , and the surface of the test piece exposed from this sample window acts as the working electrode.
  • the measurement of the natural potential and the potential when the absolute value of the cathodic current density reaches 1 mA/cm 2 was performed by first immersing the above working electrode, counter electrode, and reference electrode in the above test solution and leaving it for 600 seconds. During this time, the electrode potential was measured at a sampling interval of 10 seconds, and the average value of 60 points was taken as the "natural potential" of the aluminum foil. Next, the natural potential of each test piece was swept in the negative direction to -1500 mV at a sweep rate of 0.5 mV/s using a potentiostat (Hokuto Denko Corporation: Electrochemical Measurement System HZ-7000 Series), and a cathodic polarization curve was measured.
  • a potentiostat Hokuto Denko Corporation: Electrochemical Measurement System HZ-7000 Series
  • the aluminum foils B1 to B16 shown in Table 2 have a dissolution loss per unit surface area in a weak acid environment of less than 2.8 ⁇ g/mm 2 or have a rolling workability evaluation of “F” when cold rolled (see Table 2). It was found that good results were not obtained in at least one evaluation of chemical solubility and rolling workability in a weak acid environment.
  • FIG. 3 shows a scatter diagram showing the relationship between [Fe] + [Ni] + 2 ⁇ [Zn] and weak acid solubility ( ⁇ g/mm 2 ) for the aluminum foils A1 to 45 and B1 to 16, where the contents of Fe, Ni and Zn in the aluminum foils are [Fe], [Ni] and [Zn], respectively, in mass % .
  • the Fe content is at least 0.0001% by mass to 3.1% by mass
  • the Ni content is preferably 0.0001% by mass to 3.0% by mass
  • the Zn solid solution amount is preferably 0.3% by mass to 4.1% by mass
  • the inevitable impurities are one or more elements selected from the group consisting of Si, Mn, Mg, Cu, In, Sn, Na, V, Ti, Zr, Cr, B, Ga, Bi, Pb, Sb, and As, the total content of the one or more elements is 0.6% by mass or less
  • the Mn content is preferably 0.4% by mass or less
  • the Mg content is preferably 0.4% by mass or less
  • the content of each of the above elements other than Mn and Mg contained as inevitable impurities is preferably 0.2% by mass or less.
  • the area occupancy of second phase particles having an equivalent circle diameter of 0.1 ⁇ m or more distributed on the aluminum foil surface is preferably 1.7% or more, and the area occupancy of second phase particles having an equivalent circle diameter of 3.0 ⁇ m or more distributed on the aluminum foil surface is preferably 2.0% or less.
  • Laminate using aluminum foil ⁇ From the evaluation results (see Tables 1 and 2) of the chemical solubility of the aluminum foil in a weak acid environment described above, in order to obtain an aluminum foil having excellent chemical solubility in weak acids, in an aluminum foil containing Al, Fe, Ni and Zn, when the contents of Fe, Ni and Zn in the aluminum foil are [Fe], [Ni] and [Zn], respectively, in mass%, [Zn] is 0.4 to 5.1, [Fe] + [Ni] is 0.4 to 4.8, and [Fe] + [Ni] + 2 ⁇ [Zn] is 2.5 or more. It can also be understood by comparing the aluminum foils of foils A4, 9, 16, 22, and 38 with the aluminum foils of foils B2, 11, 13, and 14 among the aluminum foils of foils A1 to 45 and foils B1 to 16.
  • laminates of Examples 1 to 16 and Comparative Examples 1 to 15 described in detail below laminates were produced using aluminum foils A4, 9, 16, 22, and 38 and aluminum foils B2, 11, 13, and 14, respectively, and the separation properties of the resin layer in the laminates against an aqueous solution containing an acid and an ionic chloride were evaluated.
  • Example 1 An epoxy coating agent (Osaka Printing Ink Mfg. Co., Ltd.: Opicoat ESH230 Medium, solid content 36% by mass) was diluted with MEK to a solid content of 20% by mass and applied to the glossy side of the A4 foil using a bar coater #18 so that the weight after drying would be 5.0 g/ m2 , and the coating was dried at 150°C for 1 minute to form an epoxy resin layer.
  • An epoxy coating agent (Osaka Printing Ink Mfg. Co., Ltd.: Opicoat ESH230 Medium, solid content 36% by mass) was diluted with MEK to a solid content of 20% by mass and applied to the glossy side of the A4 foil using a bar coater #18 so that the weight after drying would be 5.0 g/ m2 , and the coating was dried at 150°C for 1 minute to form an epoxy resin layer.
  • an olefin-based coating agent (Tanaka Chemical Co., Ltd.: 290628-2, solid content 20% by mass) was applied to the erased side of the aluminum foil using a bar coater #18 so that the weight after drying would be 5.0 g/ m2 , and the coating was dried at 150°C for 1 minute to form an olefin resin layer, thereby producing the laminate of Example 1.
  • Example 2 A laminate of Example 2 was produced under the same conditions as the laminate of Example 1, except that a nitrocellulose-based coating agent (SF1009 Clear NT, manufactured by DICG, solid content 20% by mass) was applied to the glossy side of the aluminum foil of the foil A4 instead of the epoxy-based coating agent using a bar coater #18 so that the weight after drying would be 5.0 g/ m2 .
  • a nitrocellulose-based coating agent SF1009 Clear NT, manufactured by DICG, solid content 20% by mass
  • Example 3 The laminate of Example 3 was produced under the same conditions as the laminate of Example 1, except that an acrylic coating agent (Tanaka Chemical Co., Ltd., Lasban 820UN Clear, solid content 20 mass%) was applied to the glossy side of the aluminum foil of foil A4 instead of the epoxy coating agent using a bar coater #18 so that the weight after drying would be 5.0 g/m2.
  • an acrylic coating agent Teaka Chemical Co., Ltd., Lasban 820UN Clear, solid content 20 mass%
  • Example 4 The laminate of Example 4 was produced under the same conditions as the laminate of Example 1, except that a vinyl chloride-vinyl acetate copolymer-based coating agent (Leader: LD#S837G Clear, solid content 21% by mass) was applied to the erased side of the aluminum foil of the foil A4 using a bar coater #18 instead of the olefin-based coating agent, so that the weight after drying would be 5.0 g/ m2 .
  • a vinyl chloride-vinyl acetate copolymer-based coating agent Leader: LD#S837G Clear, solid content 21% by mass
  • Example 5 The laminate of Example 5 was produced under the same conditions as the laminate of Example 1, except that a polyester-based coating agent (Leader: PET A-1 Clear, solid content 33% by mass) was applied to the erased side of the aluminum foil of the foil A4 using a bar coater #12 instead of the olefin-based coating agent so that the weight after drying would be 5.0 g /m2.
  • a polyester-based coating agent Leader: PET A-1 Clear, solid content 33% by mass
  • Example 6 The laminate of Example 6 was produced under the same conditions as the laminate of Example 1, except that an epoxy-based coating agent (Opicoat ESH230 Medium, solid content 36% by mass, manufactured by Osaka Printing Ink Mfg. Co., Ltd.) was diluted with MEK to a solid content of 20% by mass and applied with a bar coater #3 to a dry weight of 1.0 g/ m2 on the glossy side of the aluminum foil of the A4 foil, and then dried at 150°C for 1 minute to form an epoxy resin layer.
  • an epoxy-based coating agent Opicoat ESH230 Medium, solid content 36% by mass, manufactured by Osaka Printing Ink Mfg. Co., Ltd.
  • Example 7 The laminate of Example 7 was produced under the same conditions as the laminate of Example 1, except that an epoxy-based coating agent (Opicoat ESH230 Medium, solid content 36% by mass, manufactured by Osaka Printing Ink Mfg. Co., Ltd.) was applied to the glossy side of the aluminum foil of foil A4 using a bar coater #24 so that the weight after drying would be 10.0 g/m2, and the coating was dried at 150°C for 1 minute to form an epoxy resin layer.
  • an epoxy-based coating agent Opicoat ESH230 Medium, solid content 36% by mass, manufactured by Osaka Printing Ink Mfg. Co., Ltd.
  • Example 8 The laminate of Example 8 was produced under the same conditions as the laminate of Example 1, except that an olefin-based coating agent (Tanaka Chemical: 290628-2, solid content 20 mass%) was applied to the erased side of the aluminum foil of the foil A4 using a bar coater #3 so that the weight after drying was 1.0 g/ m2 , and the coating was dried at 150°C for 1 minute to form an olefin resin layer.
  • an olefin-based coating agent Teanaka Chemical: 290628-2, solid content 20 mass
  • Example 9 The laminate of Example 9 was produced under the same conditions as the laminate of Example 1, except that an olefin-based coating agent (Tanaka Chemical: 290628-2, solid content 20% by mass) was applied to the erased side of the aluminum foil of the foil A4 using a bar coater #28 so that the weight after drying was 10.0 g/ m2 , and the coating was dried at 150°C for 1 minute to form an olefin resin layer.
  • an olefin-based coating agent Teanaka Chemical: 290628-2, solid content 20% by mass
  • a urethane-based adhesive (DICG: base agent LX-500, solid content 60% by mass, hardener KW-75, solid content 75% by mass, base agent, hardener, and ethyl acetate mixed in amounts of 10 parts by weight, 1 part by weight, and 11 parts by weight until the color was uniform) was applied to the glossy side of the A4 foil using a bar coater #14 so that the weight after drying was 5.0 g/ m2 , and the product was dried at 120°C for 1 minute to form a urethane resin adhesive layer.
  • DICG base agent LX-500, solid content 60% by mass, hardener KW-75, solid content 75% by mass, base agent, hardener, and ethyl acetate mixed in amounts of 10 parts by weight, 1 part by weight, and 11 parts by weight until the color was uniform
  • the urethane adhesive was applied to the erased side so that the weight after drying was 5.0 g/ m2 , and the layer was dried at 120°C for 1 minute to form a urethane resin adhesive layer, thereby producing a laminate of Example 10. Note that since the urethane resin layer of the laminate was sticky, the laminate was handled by sandwiching it between release films.
  • Example 11 A laminate of Example 11 was produced under the same conditions as the laminate of Example 10, except that aluminum foil A16 was used as the aluminum foil.
  • Example 12 A laminate of Example 12 was produced under the same conditions as the laminate of Example 10, except that aluminum foil A22 was used as the aluminum foil.
  • Example 13 A laminate of Example 13 was produced under the same conditions as those for the laminate of Example 10, except that aluminum foil A38 was used as the aluminum foil.
  • Example 14 A laminate of Example 14 was produced under the same conditions as the laminate of Example 10, except that aluminum foil A9 was used as the aluminum foil.
  • Example 15 A urethane adhesive (DICG: base agent LX-500, solid content 60% by mass, hardener KW-75, solid content 75% by mass, base agent, hardener, and ethyl acetate mixed in amounts of 10 parts by weight, 1 part by weight, and 11 parts by weight until the color was uniform) was applied to the glossy side of the aluminum foil in Example 1 with a bar coater #14 so that the weight after drying was 5.0 g/m 2 , and the film was dried at 120°C for 1 minute to form a urethane resin adhesive layer.
  • DICG base agent LX-500, solid content 60% by mass, hardener KW-75, solid content 75% by mass, base agent, hardener, and ethyl acetate mixed in amounts of 10 parts by weight, 1 part by weight, and 11 parts by weight until the color was uniform
  • a 12 ⁇ m thick polyethylene terephthalate film (Toyobo: E5100, density 1.4 g/cm 3 ) was attached with a small laminator at a nip temperature of 60°C and a speed of 5 m/min. Furthermore, a urethane resin adhesive layer was formed on the matte surface of the aluminum foil in the same manner as on the glossy surface, and a 12 ⁇ m thick polyethylene terephthalate film (Toyobo: E5100, density 1.4 g/cm 3 ) was laminated thereon. The laminate was then aged at 40° C. for 3 days to produce the laminate of Example 15.
  • Example 16 A laminate of Example 16 was produced under the same conditions as the laminate of Example 1, except that no olefin-based coating agent was applied to the matte side of the aluminum foil of foil A4.
  • Comparative Example 1 A laminate of Comparative Example 1 was produced under the same conditions as those of the laminate of Example 1, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 2 A laminate of Comparative Example 2 was produced under the same conditions as the laminate of Example 2, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 3 A laminate of Comparative Example 3 was produced under the same conditions as those of the laminate of Example 3, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 4 A laminate of Comparative Example 4 was produced under the same conditions as those of the laminate of Example 4, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 5 A laminate of Comparative Example 5 was produced under the same conditions as those of the laminate of Example 5, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 6 A laminate of Comparative Example 6 was produced under the same conditions as those of the laminate of Example 6, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 7 A laminate of Comparative Example 7 was produced under the same conditions as the laminate of Example 7, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 8 A laminate of Comparative Example 8 was produced under the same conditions as those of the laminate of Example 8, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 9 A laminate of Comparative Example 9 was produced under the same conditions as those of the laminate of Example 9, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 10 A laminate of Comparative Example 10 was produced under the same conditions as those of the laminate of Example 10, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 11 A laminate of Comparative Example 11 was produced under the same conditions as those of the laminate of Example 10, except that the aluminum foil B13 was used as the aluminum foil.
  • Comparative Example 12 A laminate of Comparative Example 12 was produced under the same conditions as the laminate of Example 10, except that the aluminum foil B11 was used as the aluminum foil.
  • Comparative Example 13 A laminate of Comparative Example 13 was produced under the same conditions as the laminate of Example 10, except that aluminum foil B14 was used as the aluminum foil.
  • Comparative Example 14 A laminate of Comparative Example 14 was produced under the same conditions as the laminate of Example 15, except that the aluminum foil B2 was used as the aluminum foil.
  • Comparative Example 15 A laminate of Comparative Example 15 was produced under the same conditions as those of the laminate of Example 16, except that the aluminum foil B2 was used as the aluminum foil.
  • test piece whose resin layer separated from the aluminum foil within 6 hours was rated as "A”
  • test piece whose resin layer separated from the aluminum foil within 12 hours was rated as "B”
  • test piece whose resin layer separated from the aluminum foil within 24 hours was rated as "C”
  • test piece whose resin layer did not separate from the aluminum foil within 24 hours was rated as "F”.
  • Table 4 The results are shown in Table 4.
  • the aluminum foils A4, 9, 16, 22, and 38 used in the laminates of Examples 1 to 16 all exhibit high chemical solubility in a weak acid environment compared to the laminates of Comparative Examples 1 to 15 (Tables 1 and 2), and therefore can also exhibit high solubility in aqueous solutions containing acids and ionic chlorides. Therefore, it is believed that by immersing the laminates of Examples 1 to 16 in an aqueous solution containing acids and ionic chlorides, the aluminum foil exposed to the outside due to cutting at the end faces of the laminate dissolves at a high rate from the end faces of the laminate toward the inside, and the resin layer is easily separated from the laminate (aluminum foil). As a result, the laminates of Examples 1 to 16 are expected to easily separate and recover only the resin layer from the laminate (aluminum foil), and to exhibit high recyclability.
  • the aluminum foil in the laminate is easily dissolved even when it is disposed of, so that the resin layer consisting of the resin film layer and the resin coat layer can be easily separated and recycled.
  • the aluminum foil in the laminate of the present invention has excellent properties such as high chemical solubility, it is possible to treat, for example, surface treatment for improving adhesive strength and etching treatment for processing into a desired shape using a weak acid. Therefore, the laminate of the present invention can be produced by a production method with less environmental impact.
  • the aluminum foil used in the laminate of the present invention has excellent chemical solubility in weak acids, so it can be used in fields where there is a need to switch to etching solutions with less environmental impact, and is expected to be particularly effective as a substrate for etching processes aimed at forming special fine surfaces.

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007070714A (ja) * 2005-09-09 2007-03-22 Mitsubishi Alum Co Ltd 抗菌性アルミニウム展伸材及びその製造方法
JP2007098211A (ja) * 2005-09-30 2007-04-19 Nihon Tetra Pak Kk アルミニウム層含有積層包装材料の分離方法および剥離液
WO2014034240A1 (ja) * 2012-08-30 2014-03-06 住友軽金属工業株式会社 ラミネート後の成形性に優れたアルミニウム合金箔とその製造方法、および該アルミニウム合金箔を用いたラミネート箔
JP2015178386A (ja) * 2014-02-27 2015-10-08 東洋アルミニウム株式会社 プレススルーパックの蓋材及びそれを用いたプレススルーパック
CN109295361A (zh) * 2018-10-23 2019-02-01 宁波龙安包装科技有限公司 复合型抗拉药用铝箔及其加工方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007070714A (ja) * 2005-09-09 2007-03-22 Mitsubishi Alum Co Ltd 抗菌性アルミニウム展伸材及びその製造方法
JP2007098211A (ja) * 2005-09-30 2007-04-19 Nihon Tetra Pak Kk アルミニウム層含有積層包装材料の分離方法および剥離液
WO2014034240A1 (ja) * 2012-08-30 2014-03-06 住友軽金属工業株式会社 ラミネート後の成形性に優れたアルミニウム合金箔とその製造方法、および該アルミニウム合金箔を用いたラミネート箔
JP2015178386A (ja) * 2014-02-27 2015-10-08 東洋アルミニウム株式会社 プレススルーパックの蓋材及びそれを用いたプレススルーパック
CN109295361A (zh) * 2018-10-23 2019-02-01 宁波龙安包装科技有限公司 复合型抗拉药用铝箔及其加工方法

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