WO2022270157A1 - 成形容器用積層体、成形容器および包装体 - Google Patents

成形容器用積層体、成形容器および包装体 Download PDF

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Publication number
WO2022270157A1
WO2022270157A1 PCT/JP2022/019499 JP2022019499W WO2022270157A1 WO 2022270157 A1 WO2022270157 A1 WO 2022270157A1 JP 2022019499 W JP2022019499 W JP 2022019499W WO 2022270157 A1 WO2022270157 A1 WO 2022270157A1
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Prior art keywords
layer
molded container
laminate
sealing
flange portion
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PCT/JP2022/019499
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English (en)
French (fr)
Japanese (ja)
Inventor
優樹 田中
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昭和電工パッケージング株式会社
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Priority to JP2023529668A priority Critical patent/JPWO2022270157A1/ja
Publication of WO2022270157A1 publication Critical patent/WO2022270157A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers

Definitions

  • the present invention relates to a laminate used as a material for a high-barrier molded container for hermetically packaging foods, pharmaceuticals, electronic parts, etc. as contents, a molded container molded from the laminate, and a container containing the contents using the molded laminate. It relates to a package formed by hermetic packaging.
  • Metal laminate packaging material is a layered product in which thermoplastic or thermosetting synthetic resin is laminated on both sides of metal foil. It is used as a means of long-term preservation of perishable contents.
  • laminated packaging materials using aluminum foil including both pure aluminum foil and aluminum alloy foil; the same shall apply hereinafter) are highly effective in blocking light, moisture, oxygen, etc., and are low in cost, and thus are in high demand.
  • a package When filling and sealing contents such as food in a high-barrier molded container, a package is prepared by filling the contents into the molded container and heat-sealing the lid material to the flange of the molded container, and then obtained Generally, the package is heat sterilized by boiling sterilization, retort sterilization, or the like. At this time, there is a risk that the package will expand due to heating and the sealability will be impaired.
  • Patent Document 1 by using a propylene-ethylene-butene coextruded film as a sealant film constituting a seal layer of a laminate for a molded container, the reduction in opening strength due to heat treatment such as boiling is small, and easy opening is achieved. is disclosed, and a technique relating to a laminate that is suitable for moldability when manufacturing a container is disclosed.
  • Patent Document 2 easy-openability is imparted by perforating fine holes only in the heat-sealing layer of the lid material for a container to lower the strength when opening the lid while maintaining the barrier properties and sealing properties of the lid material.
  • Patent Document 3 a container formed by molding a laminated material consisting of an aluminum foil and a synthetic resin coating layer covering both sides of the aluminum foil has a double-flange structure by bending the flange portion to increase the rigidity of the flange portion. Techniques for increasing the flange strength required for unsealing are disclosed. Further, Patent Document 4 describes a laminated body for a molded container in which a synthetic resin layer, an aluminum foil layer and a protective layer are laminated in this order. By specifying the ratio of tensile elastic modulus, the ratio of breaking strength, and the ratio of elongation, a technology is disclosed that has excellent moldability and container shape retention and does not cause undulations in the flange portion after retort sterilization.
  • the lid material is heat-sealed on the flange portion of the molded container in an automatic line.
  • the flange portion of the molded container that is put into the automatic line is deformed due to undulation, distortion, warping, etc.
  • the flange portion can be used to take out the molded container from the stacked state on the line, or to remove the molded container. Problems occur during transportation. Therefore, the shape of the flange portion of the molded container is required to be flat, and standard tolerances are provided for the shape and dimensions of the molded container.
  • Patent Document 5 the flange portion is made smooth in order to seal the molded container by heat sealing with a lid material, and a rim portion is provided on the outer periphery of the flange portion to impart rigidity, thereby suppressing waviness of the flange portion due to heating.
  • Patent Document 6 discloses a tool for curling (rim winding) the outer circumference of the flange portion of a molded container and a curling method. It is said that wrinkles can be prevented from occurring around the circumference (base).
  • Patent Literature 7 discloses a technique of forming a specific bending structure in a flange portion in order to prevent the flange portion of a container molded from a synthetic resin sheet from warping.
  • Patent Document 8 in a laminate for a molded container obtained by laminating a heat-sealable resin layer, a thermoplastic resin layer, an aluminum foil layer and a thermoplastic resin layer in this order, the tensile strength and elongation of the aluminum foil, and the thermoplasticity
  • a technique for suppressing the occurrence of pinholes during molding by specifying the tensile strength and elongation of the resin layer and molding deeper is disclosed.
  • Patent Document 4 describes a laminated body for a molded container in which a synthetic resin layer, an aluminum foil layer and a protective layer are laminated in this order.
  • Patent Documents 1 and 2 even if an easy-to-open sealant layer is laminated as a sealing layer of a laminate for a molded container or a lid material, if the strength of the flange portion of the molded container itself is weak, it may be difficult to open the molded container. In some cases, the flange part was lifted together with the tab of the cover material, and the ease of opening was lowered, making it difficult to open the package. As in Patent Document 3, when the flange portion of the molded container is bent to form a double flange structure, the rigidity of the flange portion is improved and the opening property can be secured.
  • Patent Document 4 by specifying the mechanical properties of the aluminum foil layer and the synthetic resin layer, there is no breakage during molding, no wrinkles in the flange, and the flange can be curled. However, there is no description regarding the opening and sealing properties after retort sterilization.
  • the prior arts 4 to 8 with respect to the moldability of the high-barrier molded container and the problems of the flange portion have the following problems.
  • the method of controlling the shape of the flange portion by designing the forming tool as in Patent Document 6 is effective against waviness and distortion of the flange portion in a laminate in which resin sheets of different thicknesses and types are laminated on both sides of a metal foil.
  • the effect of improvement is unknown, and remodeling of existing press molding machines and adjustment of tools are costly. If a specific bent structure is formed in the flange portion of the molded container as in Patent Document 7, warping of the flange portion can be prevented. Moreover, this means cannot be applied to a molded container having a design in which the flange portion is not provided with a bending structure.
  • Patent Document 8 the tensile strength and elongation of the aluminum foil layer and the thermoplastic resin layer in the laminate for molded containers are defined to improve the moldability of the laminate. , waviness, warpage, etc.) were not taken into consideration, and the flange portion was sometimes deformed.
  • Patent Document 4 by specifying the mechanical properties of the aluminum foil layer and the synthetic resin layer, there is no breakage during molding, no wrinkles in the flange, and the flange can be curled.
  • the effect of the protective layer on the moldability and the flange portion was not taken into consideration, and the effect of preventing the waviness of the flange portion was not clear.
  • a first object of the present invention is to provide a laminated body for a molded container that does not impair the opening performance due to deformation of the flange portion when unsealed, and provides a molded container with excellent sealing performance.
  • the present invention provides a molded container that can suppress deformation such as waviness in the flange portion of the molded container after molding or after retort sterilization, and has good sealing performance by maintaining the smoothness of the flange portion.
  • a second object of the present invention is to provide a laminate for a molded container that provides
  • the first aspect of the present invention consists of the following aspects in order to achieve the above first object.
  • a laminated body used as a material for a cup-shaped molded container having a flange portion around the opening It has, in order from the outside, a protective layer made of synthetic resin, a barrier layer made of aluminum foil, and a sealing layer made of heat-fusible resin, Tensile yield strength of protective layer: ⁇ A (N/mm 2 ), Thickness of protective layer: tA (mm) Tensile strength of barrier layer: ⁇ B (N/mm 2 ), Barrier layer thickness: tB (mm), Tensile yield strength of sealing layer: ⁇ C (N/mm 2 ), When the thickness of the seal layer is tC (mm), A laminate for a molded container, wherein 16 ⁇ A ⁇ tA+ ⁇ B ⁇ tB+ ⁇ C ⁇ tC ⁇ 25.
  • the "tensile yield strength of the protective layer” and the “tensile yield strength of the sealing layer” refer to the synthetic resin constituting the protective layer or the thermoplastic resin constituting the sealing layer in the longitudinal direction ( MD), transverse direction (TD) and 45 ° direction, in accordance with JIS K7127: 1999 (Plastics - Test method for tensile properties), test piece width 10 mm, gauge length 50 mm, tensile speed 100 mm / min It means the arithmetic mean value of the tensile yield strength obtained by measuring under the conditions.
  • the protective layer is made of a single layer film or a multilayer film of polyolefin resin, polyester resin, or polyamide resin, and the thickness of the protective layer: tA is 0.03 to 0.2 mm.
  • tA is 0.03 to 0.2 mm.
  • a cup-shaped molded container having a flange portion on the periphery of the opening A molded container, wherein the molded container laminate according to any one of 1) to 4) is molded into a cup shape so that the sealing layer is located inside the molded container.
  • a package characterized in that the peripheral edge of the bottom surface of the lid member is heat-sealed to the top surface of the flange portion of the molded container of 5) or 6) filled with contents.
  • the package according to 7) or 8) above which has a maximum bursting pressure of 40 kPa or more.
  • the "maximum pressure at bursting" is measured at 125°C for 20 minutes according to the "Container Bursting Strength Test Method" specified in JIS Z0238:1998. After retorting under the conditions, a 1 mm thick rubber sheet is attached to the surface of the lid material, an air needle is pierced through the rubber sheet, and compressed air is fed into the package at a rate of 1.0 ⁇ 0.2 liters/min. and the maximum pressure at which the package bursts (pressure inside the container).
  • the second aspect of the present invention consists of the following aspects in order to achieve the above second object.
  • a laminate used as a material for a cup-shaped molded container having a flange portion on the opening peripheral edge It has, in order from the outside, a protective layer made of synthetic resin, a barrier layer made of aluminum foil, and a sealing layer made of heat-fusible resin, Tensile yield strength of protective layer: ⁇ A (N/mm 2 ) Thickness of protective layer: tA (mm), Tensile strength of barrier layer: ⁇ B (N/mm 2 ) Barrier layer thickness: tB (mm), Tensile yield strength of seal layer: ⁇ C (N/mm 2 ) When the thickness of the seal layer is tC (mm), A laminate for a molded container, wherein 0.1 ⁇ ( ⁇ A ⁇ tA+ ⁇ C ⁇ tC)/( ⁇ B ⁇ tB) ⁇ 0.95.
  • the "tensile yield strength of the protective layer” and the “tensile yield strength of the sealing layer” refer to the synthetic resin constituting the protective layer or the thermoplastic resin constituting the sealing layer in the longitudinal direction ( MD), transverse direction (TD) and 45 ° direction, in accordance with JIS K7127: 1999 (Plastics - Test method for tensile properties), test piece width 10 mm, gauge length 50 mm, tensile speed 100 mm / min It means the arithmetic mean value of the tensile yield strength obtained by measuring under the conditions.
  • the protective layer is composed of a single layer film or a multilayer film of polyolefin resin, polyester resin, or polyamide resin, and the thickness of the protective layer: tA is 0.03 to 0.2 mm.
  • tA is 0.03 to 0.2 mm.
  • a cup-shaped molded container having a flange portion on the periphery of the opening A molded container obtained by molding the molded container laminate according to any one of 11) to 14) above into a cup shape so that the sealing layer is located inside the molded container.
  • a package characterized in that the periphery of the lower surface of the lid member is heat-sealed to the top surface of the flange portion of the molded container of 15) filled with contents.
  • the third aspect of the present invention consists of the following aspects in order to achieve the above first and second objects.
  • a laminate used as a material for a cup-shaped molded container having a flange portion on the periphery of the opening It has, in order from the outside, a protective layer made of synthetic resin, a barrier layer made of aluminum foil, and a sealing layer made of heat-fusible resin, Tensile yield strength of protective layer: ⁇ A (N/mm 2 ), Thickness of protective layer: tA (mm) Tensile strength of barrier layer: ⁇ B (N/mm 2 ), Barrier layer thickness: tB (mm), Tensile yield strength of sealing layer: ⁇ C (N/mm 2 ), When the thickness of the seal layer is tC (mm), A laminate for a molded container, wherein 16 ⁇ A ⁇ tA+ ⁇ B ⁇ tB+ ⁇ C ⁇ tC ⁇ 25 and 0.1 ⁇ ( ⁇ A ⁇ tA+ ⁇ C ⁇ tC)/( ⁇ B ⁇ tB) ⁇ 0.95.
  • the "tensile yield strength of the protective layer” and the “tensile yield strength of the sealing layer” refer to the synthetic resin constituting the protective layer or the thermoplastic resin constituting the sealing layer in the longitudinal direction ( MD), transverse direction (TD) and 45 ° direction, in accordance with JIS K7127: 1999 (Plastics - Test method for tensile properties), test piece width 10 mm, gauge length 50 mm, tensile speed 100 mm / min It means the arithmetic mean value of the tensile yield strength obtained by measuring under the conditions.
  • the protective layer is composed of a single layer film or a multilayer film of polyolefin resin, polyester resin, or polyamide resin, and the thickness of the protective layer: tA is 0.03 to 0.2 mm.
  • tA is 0.03 to 0.2 mm.
  • a cup-shaped molded container having a flange on the periphery of the opening A molded container, wherein the molded container laminate according to any one of 21) to 24) is molded into a cup shape so that the sealing layer is located inside the molded container.
  • the package according to 27) or 28) above which has a maximum bursting pressure of 40 kPa or more.
  • the "maximum pressure at bursting” is defined by JIS Z0238:1998, in accordance with the "Container Bursting Strength Test Method". After retorting under the conditions, a 1 mm thick rubber sheet is attached to the surface of the lid material, an air needle is pierced through the rubber sheet, and compressed air is fed into the package at a rate of 1.0 ⁇ 0.2 liters/min. and the maximum pressure at which the package bursts (pressure inside the container).
  • the present inventors have made a number of trial laminates for molded containers in which the structures of the protective layer, barrier layer, and seal layer are variously changed, and the molded containers molded using these are heated.
  • the tensile yield strength ( ⁇ A, ⁇ C) and thickness (tA, tC) of the materials constituting the protective layer and the sealing layer and the tensile strength of the material constituting the barrier layer It has been found that the desired effect can be obtained when ( ⁇ B) and thickness (tB) satisfy a predetermined relationship.
  • a molded container molded using the same laminate can be used after boiling sterilization or retort sterilization, for example. Excellent sealing performance is obtained even afterward, and the flange portion does not rise when unsealing, resulting in good unsealing performance.
  • the sealing layer is made of a polyolefin resin, the followability is good, and draw molding is particularly easy.
  • the inner surface of the molded container molded using the same has good resistance to contents, and the barrier layer can be protected from corrosion factors of the contents.
  • the thickness of the sealing layer: tC is 0.06 to 0.4 mm, so the following problems can be avoided. That is, when tC is less than 0.06 mm, the sealing performance of the molded container becomes unstable, impairing the function of the sealing layer.
  • the thickness of the barrier layer: tB is 0.06 to 0.18 mm, so the following problems can be avoided. That is, when tB is less than 0.06 mm, the rigidity of the flange portion of the molded container is lowered, and the flange portion tends to be lifted when the container is opened, which may deteriorate the ease of opening. On the other hand, if tB exceeds 0.18 mm, it becomes difficult for the flange portion to rise when the package is opened, but the barrier layer becomes thicker than necessary, which impairs formability.
  • the protective layer is made of a polyolefin resin, a polyester resin or a polyamide resin, it has good conformability and good moldability, especially drawability.
  • the thickness of the protective layer: tA is 0.03 to 0.2 mm, so the following problems can be avoided. That is, if tA is less than 0.03 mm, the cushioning property may deteriorate when the lid material is heat-sealed to the flange portion of the molded container, and the sealability may become unstable. On the other hand, if tA exceeds 0.2 mm, it becomes difficult for the flange portion to rise when the package is opened, but the barrier layer becomes thicker than necessary, which impairs formability.
  • the width of the flange portion is 3 to 20 mm, the following problems can be avoided. That is, when the width of the flange portion is less than 3 mm, a sufficient sealing width cannot be obtained, resulting in unstable sealing performance. On the other hand, if the width of the flange portion exceeds 20 mm, the flange portion tends to be lifted at the time of unsealing, resulting in poor unsealability.
  • the width of the seal portion is 2 to 18 mm, the following problems can be avoided.
  • the width of the seal portion is less than 2 mm, there is a possibility that the sealing performance cannot be ensured.
  • the width of the seal portion exceeds 18 mm, there is no problem in sealing performance, but the flange portion tends to be lifted when unsealing, resulting in poor unsealing performance.
  • the sealing strength of the sealing portion between the flange portion of the molded container and the lid member is high, and the sealability is excellent, so that the contents can be reliably stored for a long time.
  • the present inventor has made a number of trial laminates for molded containers in which the structures of the protective layer, the barrier layer and the seal layer are variously changed, and the molded containers molded using these are provided with flanges.
  • the tensile yield strength ( ⁇ A, ⁇ C) and thickness (tA, tC) of the materials that make up the protective layer and the sealing layer and the tensile strength ( It has been found that a desired effect can be obtained when ⁇ B) and thickness (tB) satisfy a predetermined relationship.
  • the seal layer is made of a polyolefin resin, the followability is good, and draw molding is particularly easy.
  • the inner surface of the molded container molded using the same has good resistance to contents, and the barrier layer can be protected from corrosion factors of the contents.
  • the thickness of the sealing layer: tC is 0.06 to 0.4 mm, so the following problems can be avoided. That is, when tC is less than 0.06 mm, the sealing performance of the molded container becomes unstable, impairing the function of the sealing layer.
  • the thickness of the barrier layer: tB is 0.06 to 0.18 mm, so the following problems can be avoided. That is, when tB is less than 0.06 mm, the rigidity of the flange portion of the molded container is lowered, and deformation is likely to occur. On the other hand, when tB exceeds 0.18 mm, although the rigidity of the molded container increases, the barrier layer becomes thicker than necessary, resulting in impaired moldability.
  • the protective layer is made of a polyolefin resin, a polyester resin or a polyamide resin, it has good conformability and good moldability, especially drawability.
  • the thickness of the protective layer: tA is 0.03 to 0.2 mm, so the following problems can be avoided. That is, if tA is less than 0.03 mm, the cushioning property may deteriorate when the lid material is heat-sealed to the flange portion of the molded container, and the sealability may become unstable. On the other hand, if tA exceeds 0.2 mm, the moldability of the molded container is impaired, although there is no problem in the sealing performance of the molded container.
  • the molded container of 15) above for example, after molding or after retort sterilization, deformation such as waving is unlikely to occur in the flange portion, so the flange portion becomes smooth and the sealing property with the lid material is good, which is excellent. A tight seal is obtained.
  • the sealing strength of the sealing portion between the flange portion of the molded container and the lid member is high, and the sealability is excellent, so that the contents can be reliably stored for a long time.
  • the laminate for the molded container according to the above 1) to 9) according to the first aspect of the present invention the laminate for the molded container according to the second aspect are synergistically achieved.
  • FIG. 1 is a partially enlarged cross-sectional view showing the layer structure of a laminate for molded containers according to an embodiment of the present invention
  • FIG. FIG. 2 is a vertical cross-sectional view showing an embodiment of a molded container obtained by molding the same laminate. It is a vertical sectional view which shows the molding method of the same molding container in process order.
  • Fig. 2 is an overall perspective view of a package formed by filling and sealing contents with the same molded container and a lid member; 1 shows a first embodiment of the sealing structure of a package, in which (a) is a partially enlarged vertical cross-sectional view before opening, and (b) is a partially enlarged vertical cross-sectional view after opening. .
  • FIG. 2 shows a second embodiment of the sealing structure of the package, in which (a) is a partially enlarged vertical cross-sectional view of the state before opening, and (b) is a partially enlarged vertical cross-sectional view of the state after opening.
  • FIG. 4 is a schematic front view showing a method of measuring the height of a molded container for evaluating waviness of a flange portion in Examples.
  • FIG. 1 An embodiment of the present invention will be described with reference to FIGS. 1 to 6.
  • FIG. 1 An embodiment of the present invention will be described with reference to FIGS. 1 to 6.
  • FIG. 1 shows one embodiment of the laminate for molded containers (1) according to the present invention.
  • the illustrated laminated body (1) is composed of a synthetic resin protective layer (11), an adhesive layer (12), an aluminum It has a barrier layer (13) made of foil, an adhesive layer (14), and a seal layer (15) made of heat-fusible resin.
  • the two adhesive layers (12) and (14) are optional and one or both of them can be omitted.
  • the protective layer (11) is a layer forming the outermost surface of the molded container (2), and is made of various known synthetic resins.
  • the protective layer (11) may be a single layer as shown in the drawing, or may be a multiple layer of two or more layers.
  • the protective layer (11) is preferably composed of a single-layer or multi-layer film of polyolefin, polyester, or polyamide, which has good conformability. preferable.
  • polyolefin include homopolypropylene (hPP), ethylene-propylene random copolymer (rPP), ethylene-propylene block copolymer (bPP), and polyethylene (PE).
  • polyethylene examples include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and the like.
  • polyester examples include polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • polyamide oriented nylon (ONy) can be exemplified.
  • single-layer protective layer (11) for example, unstretched polypropylene (CPP) made of homopolypropylene (hPP) can be exemplified.
  • CPP unstretched polypropylene
  • hPP homopolypropylene
  • the multilayer protective layer (11) considering the followability of the protective layer (11) during molding, ethylene-propylene random copolymer (rPP), ethylene-propylene block copolymer (bPP) and ethylene-propylene random Three layers of unoriented polypropylene (CPP) laminated with copolymers (rPP) in that order are preferred.
  • the multilayer protective layer (15) can be formed by various known methods such as dry lamination, melt extrusion lamination, heat lamination and gravure coating.
  • the tensile yield strength: ⁇ A of the protective layer (11) is preferably 5 to 50 N/mm 2 and more preferably 15 to 40 N/mm 2 in consideration of scratch resistance and formability.
  • the thickness tA of the protective layer (11) is preferably 0.03 to 0.2 mm, more preferably 0.03 to 0.08 mm, in consideration of sealing performance and moldability.
  • 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 aluminum foil.
  • the aluminum foil include pure aluminum foil and aluminum alloy foil, and a soft material (O material) is preferable.
  • the barrier layer (13) contains: (i) Fe: 1.2 to 1.7% by mass, or Fe: 0.7 to 1.3% by mass, Si: 0.05 to 0.3 % by mass and the balance being Al and unavoidable impurities, (ii) Pure aluminum foil with an Al purity of 99.00 mass % or more, (iii) Mn: 1.0 to 1.5 mass % and Cu: 0.05 to At least one kind of aluminum foil selected from the group consisting of aluminum alloy foils containing 0.2% by mass or Mg: 0.8 to 1.3% by mass is preferable, and the above aluminum alloy foil (i) is more preferable.
  • A1085H, A1070H, A1050H, A1N30H, A1100H, A3003H, A3004H, A8021H, and A8079H (all O materials) specified in JIS H4160:1994 can be exemplified, and A8021H, A1N30H, and A3003H are particularly suitable.
  • a base layer (not shown) made of a predetermined chemical conversion treatment solution can be formed on the outer surface and/or the inner surface of the aluminum foil.
  • the chemical conversion solution include a water-alcohol solution containing phosphoric acid, a chromium compound, a fluorine compound and/or a binder resin.
  • the amount of the chemical conversion treatment solution to be used is not particularly limited, and is generally within a range in which the amount of chromium adhered per side of the aluminum foil is 0.1 to 50 mg/m 2 (preferably 2 to 20 mg/m 2 ).
  • the underlayer of the aluminum foil may be formed by silicate treatment, zirconium chemical conversion treatment, or the like.
  • Tensile strength (maximum tensile strength) of the barrier layer (13): ⁇ B is preferably 60 to 130 N/mm 2 in consideration of workability during molding and springback of the seal layer (15), and more It is preferably 75 to 115 N/mm 2 .
  • the thickness of the barrier layer (13): tB is preferably 0.06 to 0.18 mm, more preferably 0.08 to 0.15 mm, considering the rigidity and formability of the molded container (2) (especially the flange portion (23)). is.
  • the sealing layer (15) is a layer that forms the innermost surface of the molded container (2), and also constitutes the upper surface of the flange portion (23) of the molded container (2), that is, the sealing surface with the lid member (4). However, it is composed of various known heat-sealable resins.
  • the sealing layer (15) may be a single layer as shown in the drawing, or may be a multiple layer of two or more layers.
  • the sealing layer (15) is preferably composed of a single-layer or multi-layer polyolefin film having good conformability, considering the moldability (especially drawability) of the laminate (1).
  • polyolefin examples include homopolypropylene (hPP), ethylene-propylene random copolymer (rPP), ethylene-propylene block copolymer (bPP), and polyethylene (PE).
  • polyethylene examples include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • HDPE high density polyethylene
  • CPP unstretched polypropylene
  • the multilayer seal layer an aspect in which at least one polyethylene layer and at least one polypropylene layer are included in any order is preferred.
  • Examples of this embodiment include a laminate in which a polyethylene layer, a polypropylene layer and a polyethylene layer are laminated in this order.
  • a package (5) excellent in easy-openability is obtained.
  • the multilayer seal layer (15) can be formed by various known methods such as dry lamination, melt extrusion lamination, heat lamination and gravure coating.
  • the tensile yield strength: ⁇ C of the sealing layer (15) is preferably 5 to 50 N/mm 2 , more preferably 15 to 40 N/mm 2 in consideration of scratch resistance and formability.
  • the thickness of the seal layer (15): tC is preferably 0.06 to 0.4 mm, more preferably 0.15 to 0.3 mm, in consideration of sealing performance, moldability, and reduction of waviness of the flange portion (23). .
  • the adhesive layers (12) and (14) are optional, but by interposing them between the barrier layer (13) and the protective layer (11) or the sealing layer (15), the laminate (1) can be molded. Delamination that can occur during processing can be prevented.
  • Examples of adhesives constituting the adhesive layers (12) and (14) include vinyl chloride-vinyl acetate copolymer adhesives, polyester adhesives, epoxy adhesives, polyolefin adhesives, polyurethane adhesives, and the like. and polyurethane resin-based adhesives are preferred.
  • the two-component curable polyurethane resin adhesive a two-component curable polyether urethane resin adhesive and/or a two-component curable polyester urethane resin adhesive is particularly suitable.
  • the thickness of the adhesive layers (12) and (14) is not particularly limited, and is usually 0.0005 to 0.01 mm, preferably 0.002 to 0.005 mm, considering their delamination preventive effect.
  • a printed ink layer (not shown) may be interposed between the seal layer (15) and the adhesive layer (14) or barrier layer (13).
  • Printing inks are composed of pigments, various solvents, and binder resins.
  • binder resins include shellac resins, nitrocellulose, cellulose acetate, epoxy resins, polyurethanes, chlorinated polyolefins, polyamides, acrylic resins, vinyl chloride-vinyl acetate copolymers, A polyester etc. are mentioned.
  • a vegetable oil such as soybean oil as a solvent, it is possible to consider the environment.
  • the printing ink layer may be a discontinuous layer or a continuous layer.
  • FIG. 2 shows one aspect of a molded container (2) formed by molding the laminate (1).
  • the illustrated molded container (2) has a bottom wall (21) that is circular in plan view and a substantially tapered cylindrical peripheral wall ( 22) and an annular flange portion (23) extending outward from the upper edge (opening edge) of the peripheral wall portion (22).
  • the bottom wall portion (21) has an annular step (211) at its radially intermediate position, and the inner portion of the annular step (211) is slightly higher than the outer portion thereof.
  • the peripheral wall portion (22) has an annular step (221) at a mid-height position, and the portion above the annular step (221) has a slightly larger diameter than the portion outside the annular step (221).
  • annular steps (211) and (221) enhance the mechanical strength and stackability of the molded container (2).
  • the annular steps (211) and (221) are optional.
  • the shape of the molded container is not limited to the illustrated embodiment, and can be changed as appropriate.
  • the bottom wall portion may have an elliptical shape in plan view or a rectangular shape with rounded corners. It can be annular or the like.
  • the dimensions of the molded container are not particularly limited. : 40-140mm, height: 20-100mm.
  • the width (W1) of the flange portion (23) is preferably 3 to 20 mm, more preferably 4 to 10 mm, in consideration of sealing and unsealing properties. is.
  • the width of the flange portion (23) is preferably wide from the viewpoint of sealing performance, and narrow in terms of reducing the occurrence of waviness, which will be described later. 5 to 8 mm.
  • FIG. 3 shows one embodiment of the method of manufacturing the molded container (2) using a press molding machine.
  • the press molding apparatus (6) shown in the figure includes a cylindrical lower die (punch) (61), an upper die (62) having a substantially truncated cone-shaped recess (62a) on the lower surface, and a lower die ( 61) and an annular plate-shaped wrinkle suppressor (63) disposed around the periphery of the wrinkle holder (63).
  • a spring (64) is provided below the wrinkle holder (63) to provide a constant wrinkle holding load during molding.
  • the press molding apparatus may be configured such that the punch is the upper die and the die is the lower die, contrary to the one shown in FIG.
  • a blank (10) is prepared by punching out a circle of a predetermined size from the laminate (1). Then, as shown in FIG. 3(a), the blank (10) is placed between the lower die (61) and the upper die (62) of the press molding device (6), and the upper die (62) is lowered. Then, the outer periphery of the blank (10) is sandwiched between the lower surface of the upper die (62) and the upper surface of the wrinkle holder (63). When the upper die (62) is further lowered in this state, the blank (10) is drawn as shown in FIG. 3(b). After that, the outer peripheral edge of the flange portion (23) is trimmed (not shown), if necessary. Thus, a molded container (2) with a cup-shaped flange portion (23) as shown in FIG. 2 is obtained.
  • the molded container is preferably molded by draw forming as described above, but can also be molded by stretch forming, for example.
  • the protective layer (11), barrier layer (13), and sealing layer (15) need to have their respective thicknesses set according to their functions. If the seal layer (15) is too thin, the sealability may be impaired, but if the seal layer (15) is too thick, deformation (such as waviness) of the flange portion (23) is likely to occur after retort sterilization. As a result, there is a risk that the sealing performance will deteriorate. In particular, it is important to consider the balance between openability and sealability in order to meet the need for thinning the molded container (23).
  • the molded container laminate (1) comprises ⁇ Tensile yield strength of protective layer (11): ⁇ A (N/mm 2 ) - Thickness of protective layer (11): tA (mm), ⁇ Tensile strength of barrier layer (13): ⁇ B (N/mm 2 ) ⁇ Thickness of barrier layer (13): tB (mm), ⁇ Tensile yield strength of sealing layer (15): ⁇ C (N/mm 2 ) ⁇ Thickness of the seal layer (15): When tC (mm), It satisfies the relationship of 16 ⁇ ⁇ A ⁇ tA + ⁇ B ⁇ tB + ⁇ C ⁇ tC ⁇ 25, and the molded container (2) formed by molding the same laminate has excellent sealing performance even after boiling sterilization or retort sterilization.
  • the waviness generated in the flange portion (23) of the molded container (2) is due to the rigidity of the aluminum foil forming the barrier layer (13), the sealing layer (15) and the protective layer (11) (especially the sealing layer). (15)) is considered to be due to the relationship between the residual stress due to springback after molding of the synthetic resin film forming (15)) and the shrinkage stress due to the heat effect during heat sterilization.
  • the laminate for molded containers (1) comprises ⁇ Tensile yield strength of protective layer (11): ⁇ A (N/mm 2 ) - Thickness of protective layer (11): tA (mm), ⁇ Tensile strength of barrier layer (13): ⁇ B (N/mm 2 ) ⁇ Thickness of barrier layer (13): tB (mm), ⁇ Tensile yield strength of sealing layer (15): ⁇ C (N/mm 2 ) ⁇ Thickness of the seal layer (15): When tC (mm), It satisfies the relationship of 0.1 ⁇ ( ⁇ A x tA + ⁇ C x tC) / ( ⁇ B x tB) ⁇ 0.95, whereby waving or the like occurs in the flange portion (23) after molding of the molded container (1) or after retort sterilization.
  • the laminate for a molded container (1) of the third aspect of the present invention satisfies the relationship 16 ⁇ A ⁇ tA+ ⁇ B ⁇ tB+ ⁇ C ⁇ tC ⁇ 25, and 0.1 ⁇ ( ⁇ A ⁇ tA+ ⁇ C ⁇ tC)/( ⁇ B ⁇ tB) ⁇ 0.95.
  • the effect of the laminate for molded containers (1) of the first aspect and the effect of the laminate for molded containers (1) of the second aspect are synergistically achieved. (See Examples 1-4 and Examples 11-14 below).
  • FIG. 4 shows a package formed by sealing the contents using the molded container (2).
  • the illustrated package (5) is formed by heat-sealing the lower peripheral edge of the lid (3) to the upper surface of the flange (23) of the molded container (2) filled with the contents (4).
  • the lid member (3) has a circular shape in plan view corresponding to the flange portion (23) of the molded container (2), and has an opening that protrudes outward from a part of the circumferential length of the outer peripheral edge portion of the lid member (3).
  • a tab (3a) for use is integrally provided.
  • Contents (4) include, for example, foods, pharmaceuticals, chemical products, electronic parts, batteries, sanitary products, and other industrial products. Examples of foods include butter, jelly, yokan, pudding, miso, curry, pasta sauce, juice, and dressing. Also, the shape of the content (4) is not particularly limited, and may be liquid, semi-solid, or solid.
  • the lid material (3) is a heat-sealing material for the molded container (2), and is a laminate for lid material having a protective layer (31), a barrier layer (32) and a sealing layer (33) in this order from the outside (upper side). is processed into a predetermined shape (see FIGS. 5 and 6).
  • an adhesive layer may be interposed between the protective layer (31) and the barrier layer (32) and/or between the barrier layer (32) and the sealing layer (33). good.
  • the adhesive constituting the adhesive layer the same adhesive as that constituting the adhesive layers (12) and (14) of the laminate (1) for a molded container can be used.
  • the protective layer (31) of the lid (3) is a layer constituting the outermost surface of the lid (3), and is made of various known synthetic resins.
  • the protective layer (31) may be a single layer as shown in the drawing, or may be a multiple layer of two or more layers.
  • the protective layer (31) is preferably a single-layer or multi-layer film of polyester, polyamide or polyolefin. Examples of polyester include polyethylene terephthalate (PET), polyamide includes oriented nylon (ONy), and polyolefin includes oriented polypropylene (OPP).
  • the protective layer (31) is composed of a coat layer formed of an overcoat agent such as nitrocellulose, shellac resin, epoxy resin, urethane resin, chlorinated polyolefin resin, acrylic resin, vinyl chloride-vinyl acetate copolymer, or the like. You may The thickness of the protective layer (31) is preferably 0.006-0.1 mm, more preferably 0.009-0.03 mm, in consideration of scratch resistance and moldability.
  • an overcoat agent such as nitrocellulose, shellac resin, epoxy resin, urethane resin, chlorinated polyolefin resin, acrylic resin, vinyl chloride-vinyl acetate copolymer, or the like.
  • the barrier layer (32) is a layer for protecting the contents (4) of the package (5) from gas, water vapor, light, etc., and is made of metal foil.
  • Aluminum foil is particularly preferable as the metal foil forming the barrier layer (13).
  • the same aluminum foil as that constituting the barrier layer (13) of the laminate (1) for a molded container is suitable.
  • a base layer may be provided in the same manner as in the case of the laminate for molded containers (1).
  • the thickness of the barrier layer (32) is preferably 0.009-0.05 mm, more preferably 0.012-0.025 mm, in consideration of water vapor permeability and unsealability.
  • the sealing layer (33) is a layer that forms the innermost surface of the lid (3), and is also a layer that forms a sealing surface with the flange portion (23) of the molded container (2). It is made of heat-sealable resin.
  • the sealing layer (33) may be a single layer as shown in the drawing, or may be a multiple layer of two or more layers.
  • the sealing layer (33) is preferably composed of a polyolefin single-layer or multi-layer film. Examples of polyolefin include homopolypropylene (hPP), ethylene-propylene random copolymer (rPP), ethylene-propylene block copolymer (bPP), and polyethylene (PE).
  • polyethylene examples include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE).
  • the thickness of the sealing layer (33) is preferably 0.02 to 0.2 mm, more preferably 0.03 to 0.10 mm, in consideration of sealing strength and thermal conductivity during sealing.
  • the laminate forming the lid (3) can be produced by various known methods such as dry lamination, melt extrusion lamination, heat lamination and gravure coating.
  • the shape and dimensions of the lid member (3) can be appropriately set according to the shape and dimensions of the flange portion (23) of the molded container (2).
  • FIG. 5 shows a first aspect of the sealing structure of the package (5).
  • the seal layer (15) of the molded container (1) is made of an easy-open film.
  • the easy-peelable film has a multi-layered structure, and is configured such that the layers can be peeled at a predetermined peeling/opening position (P1) when the lid member (4) is peeled off to be opened.
  • the seal layer (15) is made of a polyolefin coextruded film in which a polyethylene layer (preferably a high density polyethylene (HDPE) layer), a polypropylene layer, and a polyethylene layer are laminated in this order from the outside.
  • a polyethylene layer preferably a high density polyethylene (HDPE) layer
  • HDPE high density polyethylene
  • This polyethylene layer is heat-sealed with the polyethylene sealing layer (33) of the lid (3) to form the sealing portion (HS).
  • the width (W2) of the seal portion (HS) is preferably 2 to 18 mm, more preferably 3 to 10 mm, in consideration of sealing performance and unsealing performance.
  • an annular notch (231) is formed on the upper surface of the flange (23) of the molded container (2) at a predetermined position in the radial direction thereof, reaching the peeling/unsealing position (P1) of the sealing layer (15) or a position deeper than that. is formed.
  • the upper surface of the flange portion (23) of the molded container (2) and the lower surface of the lid (3) are heat-sealed by heat sealing using a sealing plate, or may be performed by high-frequency sealing or ultrasonic sealing. .
  • the opening tab (3a) of the lid (3) is grasped with fingers and pulled up.
  • the seal layer (15) of the flange portion (23) of the molded container (2) is gradually delaminated from the outside at the peel opening position (P1), and when the peel reaches the position of the notch (231), the seal layer (15) 15) is divided vertically at the peeling/unsealing position (P1).
  • the lid (3) When the tab (3a) is further pulled up, the lid (3) is separated from the flange (23) while the upper portion (15X) of the cut seal layer (15) is attached to the lid (3). and the package (5) is opened (see FIG. 5(b)).
  • the donut-shaped seal plate (10) when the flange portion (23) of the molded container (2) and the lid member (3) are heat-sealed, the donut-shaped seal plate (10) , its outer peripheral edge is positioned radially outward from the outer peripheral edge of the flange (23) by a distance (S1) of 1.5 to 2 mm, and its inner peripheral edge is located from the bottom of the notch (231) of the flange (23).
  • FIG. 6 shows a second aspect of the sealing structure of the package (5).
  • the sealing layer (33) of the lid (3) is made of an easy-open film.
  • the easy-open film is capable of cohesive failure, and is designed to be cohesive and detachable within the sealing layer (33) when the lid member (4) is peeled off to be opened.
  • the sealing layer (33) of the lid (3) is made of a polypropylene (PP)-based coextruded multilayer film (cohesive failure type), and the same layer serves as the flange (23) of the molded container (2).
  • PP polypropylene
  • the width (W2) of the seal portion (HS) is preferably 2 to 18 mm, more preferably 3 to 10 mm, in consideration of sealing performance and unsealing performance.
  • the notch (231) is not formed on the upper surface of the flange (23) of the molded container (2).
  • the upper surface of the flange portion (23) of the molded container (2) and the lower surface of the lid (3) are heat-sealed by heat sealing using a sealing plate, or may be performed by high-frequency sealing or ultrasonic sealing. .
  • the opening tab (3a) of the lid (3) is grasped with fingers and pulled up.
  • the seal layer (33) of the lid member is gradually coherently peeled from the position of the outer peripheral edge of the seal portion (HS), and the peeling reaches the inner peripheral edge of the seal portion (HS) or the inner peripheral edge of the upper surface of the flange portion (23).
  • the sealing layer (33) is vertically divided, and the divided lower portion (33X) of the sealing layer (33) remains on the flange portion (23).
  • the donut-shaped seal plate (10) when the flange portion (23) of the molded container (2) and the lid member (3) are heat-sealed, the donut-shaped seal plate (10) , the outer peripheral edge is positioned radially inward by a distance (S3) of 1 to 2 mm from the outer peripheral edge of the flange portion (23), and the inner peripheral edge is 1 to 2 mm from the inner peripheral edge of the lower surface of the flange portion (23).
  • the outer diameter and inner diameter of the seal plate (10) are preferably set to match the above arrangement.
  • the package (5) preferably has a maximum bursting pressure of 40 kPa or more.
  • the "maximum pressure at bursting” is defined by retorting the package at 125°C for 20 minutes in accordance with the "Container Bursting Strength Test Method" specified in JIS Z0238:1998.
  • the maximum bursting pressure of the package (5) is more preferably 45 to 65 kPa in consideration of sealing and unsealing properties.
  • rPP refers to ethylene-propylene random copolymer
  • bPP ethylene-propylene block copolymer
  • CPP unstretched polypropylene
  • HDPE shall refer to high density polyethylene and "LLDPE” shall refer to linear low density polyethylene.
  • Example 1 ⁇ Preparation of laminated body for molded container> A chemical conversion treatment solution consisting of phosphoric acid, polyacrylic acid, chromium (III) salt compound, water, and alcohol was applied to both sides of a 0.12 mm thick aluminum foil made of A8021H-O material that forms the barrier layer, and the amount of chromium deposited on one side was A treated aluminum foil was formed by coating to 10 mg/m 2 per layer and drying to form a chemical conversion film.
  • a 0.003 mm polyester polyurethane adhesive is applied to form an adhesive layer, and a 0.03 mm thick CPP film (rPP layer (0.003 mm) /bPP layer (0.024 mm)/rPP layer (0.003 mm)) to form a protective layer.
  • a blank obtained by punching out a circle of a predetermined size from the above laminate is drawn by a press molding machine so that the CPP film (protective layer) side faces the outside of the container (see FIG. 3), and the blank is shown in FIG.
  • a cup-shaped molded container was created.
  • the size of the molded container was as follows: opening diameter (inner diameter of flange): 62.5 mm, bottom wall diameter: 55.4 mm, height: 24.5 mm, flange width: 7 mm, internal volume: 64 cc.
  • lid material On one side of a 0.02 mm thick aluminum foil made of A1N30H-O material, a 0.012 mm thick PET film was dry-laminated as a protective layer using a two-component curable polyester polyurethane resin adhesive. On the other hand, a 0.03 mm thick LLDPE film was dry-laminated as a sealing layer using a two-component curing type polyester polyurethane resin adhesive, and cured in an environment of 40°C for 5 days. made the body. The obtained laminate was cut into a desired shape and size to match the flange portion of the molded container, thereby producing a lid member with an opening tab.
  • a package water-filled container was produced by performing the following steps.
  • a seal plate (10) having an outer diameter of 78.5 mm and an inner diameter of 70.5 mm is used to form a seal portion (HS) with a width of 3 mm.
  • Example 2 A laminate was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.1 mm thick aluminum foil made of A8021H-O material, and the sealing layer was formed from a 0.25 mm thick unstretched hPP film.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a sealing layer was formed from an easy peel film for PP having a thickness of 0.03 mm.
  • a lid material with an opening tab was produced.
  • a package water-filled container
  • the temperature of the seal plate during heat sealing was set to 200°C.
  • a seal plate (10) having an outer diameter of 72.5 mm and an inner diameter of 66.5 mm is used, so that the width of the formed seal portion (HS) is 3 mm. I made it No notches were formed on the upper surface of the flange portion (23).
  • the barrier layer is made of 0.14 mm thick aluminum foil made of A8021H-O material
  • the protective layer is made of 0.03 mm thick unstretched hPP film
  • the seal layer is made of 0.25 mm thick LLDPE film.
  • a laminate for a molded container was produced in the same manner as in Example 1.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a laminate for lid material was produced in the same manner as in Example 2 except that the sealing layer of the lid material was formed from a polypropylene (PP)-based coextruded multilayer film (cohesive failure type) having a thickness of 0.03 mm.
  • PP polypropylene
  • Example 4 A laminated body for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.18 mm thick aluminum foil made of A1N30H-O material and the sealing layer was formed from a 0.3 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • Example 5 A laminated body for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.12 mm thick aluminum foil made of A1N30H-O material and the sealing layer was formed from a 0.4 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • Example 6 A laminate for a molded container was produced in the same manner as in Example 1, except that the barrier layer was formed from a 0.18 mm thick aluminum foil made of A3003H-O material, and the sealing layer was formed from a 0.06 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • Example 7 A laminate for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.15 mm thick aluminum foil made of A3003H-O material and the sealing layer was formed from a 0.25 mm thick unstretched hPP film. did.
  • a blank made of the obtained laminate was used to prepare a molded container in the same manner as in Example 1 except that the width of the flange portion was set to 3 mm.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package water-filled container
  • Example 2 was produced in the same manner as in Example 2 except for the following points. That is, referring to FIG. 6(a), the width of the seal portion (HS) formed is 2 mm by using a seal plate (10) having an outer diameter of 67.5 mm and an inner diameter of 63.5 mm for heat sealing. I made it
  • Example 8 A laminate for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.15 mm thick aluminum foil made of A3003H-O material and the sealing layer was formed from a 0.25 mm thick unstretched hPP film. did.
  • a blank made of the obtained laminate was used to prepare a molded container in the same manner as in Example 1 except that the width of the flange portion was set to 20 mm.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package water-filled container
  • Example 2 was produced in the same manner as in Example 2 except for the following points. That is, referring to FIG. 6(a), a seal plate (10) having an outer diameter of 100.5 mm and an inner diameter of 64.5 mm is used for heat sealing, so that the width of the formed seal portion (HS) is 18 mm. I made it
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.05 mm thick CPP film (rPP layer (0.005 mm)/bPP layer (0.040 mm)/rPP layer ( 0.005 mm)), and the sealing layer was formed from a non-stretched hPP film having a thickness of 0.25 mm.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • the protective layer is formed by a 0.2 mm thick CPP film (rPP layer (0.02 mm) / bPP layer (0.16 mm) / rPP layer (0.02 mm)) by the T-die method, and the other is the same as in Example 1.
  • Molded container A laminate for A molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 1 into a required shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 1 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.25 mm thick CPP film (rPP layer (0.025 mm)/bPP layer (0.2 mm)/rPP layer ( 0.025 mm)), and the sealing layer was formed from a non-stretched hPP film having a thickness of 0.12 mm.
  • a molded container was produced in the same manner as in Example 1 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A1N30-O material
  • the protective layer is a 0.04 mm thick CPP film (rPP layer (0.004 mm)/bPP layer (0.032 mm)/rPP layer ( 0.004 mm)), and the sealing layer was formed from a non-stretched hPP film having a thickness of 0.2 mm.
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.025 mm thick CPP film (rPP layer (0.0025 mm)/bPP layer (0.02 mm)/rPP layer ( 0.0025 mm)), and the sealing layer was formed from a non-stretched hPP film having a thickness of 0.1 mm.
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.25 mm thick aluminum foil made of A3003H-O material, and the seal layer is a 0.04 mm thick CPP film (rPP layer (0.004 mm)/bPP layer (0.032 mm)/rPP layer ( 0.004 mm)).
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • Example 5 A laminate for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.1 mm thick aluminum foil made of A8021H-O material and the sealing layer was formed from a 0.45 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • a laminate for a molded container was produced in the same manner as in Example 1 except that the barrier layer was formed from a 0.05 mm thick aluminum foil made of A8021H-O material and the sealing layer was formed from a 0.2 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 2 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 2 using the obtained molded container and lid material.
  • the barrier layer is made of 0.08 mm thick aluminum foil made of A1N30H-O material
  • the sealing layer is made of 0.25 mm thick LLDPE film
  • the protective layer is made of 0.030 mm thick CPP film (rPP layer ( 0.003 mm)/bPP layer (0.024 mm)/rPP layer (0.003 mm)).
  • a molded container was produced in the same manner as in Example 1 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 3 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 3 using the obtained molded container and lid material.
  • Table 1 summarizes the constituent materials and thickness ( ⁇ m) of each of the protective layer, barrier layer, and seal layer for the laminates for molded containers of Examples 1 to 10 and Comparative Examples 1 to 7 described above.
  • Tensile yield strength (N/mm 2 ): ⁇ A, ⁇ C (MD, TD, measured values in the 45° direction and their average values), barrier layer tensile strength (N/mm 2 ): ⁇ B (MD, TD , measured values in the 45° direction and their arithmetic average), and the calculated values of tA x ⁇ A, tB x ⁇ B, tC x ⁇ C, and ⁇ A x tA + ⁇ B x tB + ⁇ C x tC.
  • Example 11 ⁇ Preparation of laminated body for molded container> A chemical conversion treatment solution consisting of phosphoric acid, polyacrylic acid, chromium (III) salt compound, water, and alcohol was applied to both sides of a 0.12 mm thick aluminum foil made of A8021H-O material that forms the barrier layer, and the amount of chromium deposited on one side was A treated aluminum foil was formed by coating to 10 mg/m 2 per layer and drying to form a chemical conversion film.
  • a 0.003 mm polyester polyurethane adhesive is applied to form an adhesive layer, and a 0.03 mm thick CPP film (rPP layer (0.003 mm) /bPP layer (0024 mm)/rPP layer (0.003 mm)) were laminated to form a protective layer.
  • a blank obtained by punching out a circle of a predetermined size from the above laminate is drawn by a press molding machine so that the CPP film (protective layer) side faces the outside of the container (see FIG. 3), and the blank is shown in FIG.
  • a cup-shaped molded container was created.
  • the size of the molded container was as follows: opening diameter (inner diameter of flange): 62.5 mm, bottom wall diameter: 55.4 mm, height: 24.5 mm, internal volume: 64 cc.
  • two types of molded containers having flange widths of 7 mm and 9 mm were produced.
  • lid material On one side of a 0.02 mm thick aluminum foil made of A1N30H-O material, a 0.012 mm thick PET film was dry-laminated as a protective layer using a two-component curable polyester polyurethane resin adhesive. On the other hand, a 0.03 mm thick LLDPE film was dry-laminated as a sealing layer using a two-component curing type polyester polyurethane resin adhesive, and cured in an environment of 40°C for 5 days. made the body. The resulting laminate was cut into a desired shape and size to match the flange portions of two types of molded containers, thereby producing lid members with opening tabs.
  • a package water-filled container was produced by performing the following steps.
  • a seal plate (10) having an outer diameter of 78.5 mm and an inner diameter of 70.5 mm is heat-sealed.
  • the seal portion (HS ) were made to have a width of 3 mm, and their outer peripheral edges were made to coincide with the outer peripheral edge of the flange portion (23).
  • Example 12 A laminate for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed of a 0.1 mm thick aluminum foil made of A8021H-O material, and the sealing layer was formed of a 0.25 mm thick unstretched hPP film. .
  • This laminate is the same as the laminate of Example 2.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a sealing layer was formed from an easy peel film for PP having a thickness of 0.03 mm. By cutting the obtained laminate into a required shape and size, a lid material with an opening tab was produced.
  • a package (water-filled container) was produced in the same manner as in Example 11 except for the following points. That is, the temperature of the seal plate during heat sealing was set to 200°C. Also, referring to FIG. 6(a), in the case of heat sealing, in the case of a formed container (2) having a flange portion (23) width of 7 mm, a sealing plate (10) having an outer diameter of 72.5 mm and an inner diameter of 66.5 mm is used. In the case of a molded container (2) having a flange portion (23) width of 9 mm, a seal plate (10) having an outer diameter of 74.5 mm and an inner diameter of 68.5 mm is used to form a seal portion (HS). All the widths were set to 3 mm. No notches were formed on the upper surface of the flange portion (23).
  • the barrier layer is made of 0.14 mm thick aluminum foil made of A8021H-O material
  • the protective layer is made of 0.03 mm thick unstretched hPP film
  • the seal layer is made of 0.25 mm thick LLDPE film.
  • a laminate for a molded container was produced in the same manner as in Example 11. This laminate is the same as the laminate of Example 3.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a laminate for lid material was produced in the same manner as in Example 12 except that the sealing layer of the lid material was formed from a polypropylene (PP)-based coextruded multilayer film (cohesive failure type) having a thickness of 0.03 mm. By cutting the obtained laminate into a required shape and size, a lid material with an opening tab was produced.
  • a package water-filled container
  • Example 14 A laminate for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.18 mm thick aluminum foil made of A1N30H-O material and the sealing layer was formed from a 0.3 mm thick unstretched hPP film. did.
  • This laminate is the same as the laminate of Example 4.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • Example 15 A laminate for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.15 mm thick aluminum foil made of A3003H-O material and the sealing layer was formed from a 0.4 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • Example 16 A laminated body for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.15 mm thick aluminum foil made of A3003H-O material and the sealing layer was formed from a 0.06 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.04 mm thick CPP film (rPP layer (0.004 mm)/bPP layer (0.032 mm)/rPP layer ( 0.004 mm)), and the seal layer was formed from an LLDPE film having a thickness of 0.1 mm.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 13 into a required shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed from a 0.16 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.2 mm thick CPP film (rPP layer (0.02 mm)/bPP layer (0.16 mm)/rPP layer ( 0.02 mm))
  • a laminate for a molded container was produced.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 11 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 11 using the obtained molded container and lid material.
  • Example 11 A laminated body for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.08 mm thick aluminum foil made of A8021H-O material, and the sealing layer was formed from a 0.25 mm thick unstretched hPP film. did.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A8021H-O material
  • the protective layer is a 0.25 mm thick CPP film (rPP layer (0.025 mm)/bPP layer (0.2 mm)/rPP layer ( 0.025 mm)), and the sealing layer was formed from a non-stretched hPP film having a thickness of 0.2 mm.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • Example 13 A laminate for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.1 mm thick aluminum foil made of A8021H-O material and the sealing layer was formed from a 0.45 mm thick unstretched hPP film. did. This laminate is the same as the laminate of Comparative Example 5.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.18 mm thick aluminum foil made of A3003H-O material, and the protective layer and sealing layer are both made of 0.025 mm thick CPP film (rPP layer (0.0025 mm)/bPP layer (0.02 mm )/rPP layer (0.0025 mm)), and in the same manner as in Example 11 except for this, a laminate for a molded container was produced.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed from a 0.3 mm thick aluminum foil made of A3003H-O material, and the seal layer is a 0.06 mm thick CPP film (rPP layer (0.006 mm)/bPP layer (0.048 mm)/rPP layer ( 0.006 mm)).
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • Example 16 A laminate for a molded container was produced in the same manner as in Example 11 except that the barrier layer was formed from a 0.05 mm thick aluminum foil made of A8021H-O material and the sealing layer was formed from a 0.2 mm thick unstretched hPP film. did. This laminate is the same as the laminate of Comparative Example 6.
  • a molded container was produced in the same manner as in Example 11 using a blank made of the obtained laminate.
  • a lid material with a tab for opening was manufactured by cutting a laminate for lid material manufactured in the same manner as in Example 12 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 12 using the obtained molded container and lid material.
  • the barrier layer is formed of 0.08 mm thick aluminum foil made of A1N30H-O material
  • the protective layer is a 0.15 mm thick CPP film (rPP layer (0.015 mm)/bPP layer (0.12 mm)/rPP layer ( 0.015 mm)), and the seal layer was formed from an LLDPE film having a thickness of 0.25 mm.
  • a molded container was produced in the same manner as in Example 13 using a blank composed of the obtained laminate.
  • a lid material with an opening tab was produced by cutting a lid material laminate produced in the same manner as in Example 13 into a desired shape and size.
  • a package (water-filled container) was produced in the same manner as in Example 13 using the obtained molded container and lid material.
  • the height (H1) of the forming containers (2X) and (2Y) can be measured by attaching a square bar-shaped measuring jig (8) to the lower surface of the bottom wall portion (21) of the forming containers (2X) and (2Y) in an inverted state. Placed so that the side surface overlaps each point on the outer periphery of the flange portion (23) when viewed from the plane, and the distance between the mounting surface (7) and the lower surface of the measuring jig (8) on the vertical line passing through each point is measured. It was measured with a vernier caliper (9).
  • the present invention relates to a laminate used as a material for a high-barrier molded container for hermetically packaging foods, pharmaceuticals, electronic parts, etc. as contents, a molded container molded from the laminate, and a container containing the contents using the molded laminate. It is suitable as a sealed package.

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PCT/JP2022/019499 2021-06-22 2022-05-02 成形容器用積層体、成形容器および包装体 WO2022270157A1 (ja)

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JPH02167740A (ja) * 1988-08-31 1990-06-28 Showa Alum Corp 食品包装容器用積層シート
JP2005119692A (ja) * 2003-10-15 2005-05-12 Idemitsu Unitech Co Ltd 多層容器、易開封性包装体及び多層容器の製造方法
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WO2009050899A1 (en) * 2007-10-19 2009-04-23 Menicon Co., Ltd. Heat sealable, retortable laminated foil
JP2012214248A (ja) * 2011-04-01 2012-11-08 Kohjin Co Ltd 二軸延伸ポリブチレンテレフタレート系フィルムを含むレトルト用包材
CN103538317A (zh) * 2013-10-20 2014-01-29 江苏申凯包装高新技术股份有限公司 高强度纸塑复合膜
WO2015087901A1 (ja) * 2013-12-11 2015-06-18 大日本印刷株式会社 電池用包装材料
US20160159541A1 (en) * 2013-07-10 2016-06-09 Amcor Flexibles Gas and Light Proof, Double-Shell Blister Packs for Medicinal Contents
JP2017094746A (ja) * 2017-01-26 2017-06-01 興人フィルム＆ケミカルズ株式会社 二軸延伸ポリブチレンテレフタレート系フィルムを含む液体充填用包材
JP2021050014A (ja) * 2019-09-24 2021-04-01 大日本印刷株式会社 包装材料及び包装材料を備える包装製品
JP2021059387A (ja) * 2019-10-09 2021-04-15 昭和電工パッケージング株式会社 油脂含有食品収容用の成形容器及び包装体

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02167740A (ja) * 1988-08-31 1990-06-28 Showa Alum Corp 食品包装容器用積層シート
JP2005119692A (ja) * 2003-10-15 2005-05-12 Idemitsu Unitech Co Ltd 多層容器、易開封性包装体及び多層容器の製造方法
JP2006298381A (ja) * 2005-04-15 2006-11-02 Kagome Co Ltd 易開封性容器
CN101086316A (zh) * 2006-06-06 2007-12-12 泰州乐金电子冷机有限公司 电冰箱用真空隔热材料及其隔热结构
WO2009050899A1 (en) * 2007-10-19 2009-04-23 Menicon Co., Ltd. Heat sealable, retortable laminated foil
JP2012214248A (ja) * 2011-04-01 2012-11-08 Kohjin Co Ltd 二軸延伸ポリブチレンテレフタレート系フィルムを含むレトルト用包材
US20160159541A1 (en) * 2013-07-10 2016-06-09 Amcor Flexibles Gas and Light Proof, Double-Shell Blister Packs for Medicinal Contents
CN103538317A (zh) * 2013-10-20 2014-01-29 江苏申凯包装高新技术股份有限公司 高强度纸塑复合膜
WO2015087901A1 (ja) * 2013-12-11 2015-06-18 大日本印刷株式会社 電池用包装材料
JP2017094746A (ja) * 2017-01-26 2017-06-01 興人フィルム＆ケミカルズ株式会社 二軸延伸ポリブチレンテレフタレート系フィルムを含む液体充填用包材
JP2021050014A (ja) * 2019-09-24 2021-04-01 大日本印刷株式会社 包装材料及び包装材料を備える包装製品
JP2021059387A (ja) * 2019-10-09 2021-04-15 昭和電工パッケージング株式会社 油脂含有食品収容用の成形容器及び包装体

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