CN110697196B - Cup-shaped container and laminated body for cup-shaped container - Google Patents

Cup-shaped container and laminated body for cup-shaped container Download PDF

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Publication number
CN110697196B
CN110697196B CN201910612853.3A CN201910612853A CN110697196B CN 110697196 B CN110697196 B CN 110697196B CN 201910612853 A CN201910612853 A CN 201910612853A CN 110697196 B CN110697196 B CN 110697196B
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Prior art keywords
heat
cup
metal foil
shaped container
blank
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CN201910612853.3A
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CN110697196A (en
Inventor
苗村正
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Lishennoco Packaging Co ltd
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Showa Denko Packaging Co Ltd
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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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated material
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/265—Drinking cups
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/02—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape
    • B65D3/06—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by shape essentially conical or frusto-conical
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
    • B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/28—Other details of walls
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/72—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials
    • B65D85/78—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for for edible or potable liquids, semiliquids, or plastic or pasty materials for ice-cream

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Package Specialized In Special Use (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

The present invention relates to a cup-shaped container and a laminated body for the cup-shaped container. The object is to provide a cup-shaped container which can be manufactured at low cost by using a manufacturing facility of a cup-shaped container mainly made of paper, has excellent long-term storage stability of contents, and can be sterilized aseptically or by boiling. A cup-shaped container (1) is formed from a main body (2) and a bottom body (3) having a substantially inverted U-shaped cross section, wherein the bottom body (3) is formed by molding a bottom body blank (30A) so as to form a hanging portion (32) on the outer peripheral portion thereof. The trunk body (2) and the bottom body (3) are integrated. The body material (20A) and the base material (30A) are each formed from a laminate (20, 30) which does not have a paper layer, and which has a metal foil layer (201, 301) and a heat-fusible resin layer (202, 302) laminated on both surfaces of the metal foil layer (201, 301).

Description

Cup-shaped container and laminated body for cup-shaped container
Technical Field
The present invention relates to a cup-shaped container containing food, drink, or the like such as ice cream or yogurt, and a laminate used as a material for the container.
Background
As a container for filling and packaging semi-solid dairy products such as ice cream and yogurt, a paper cup-shaped container, that is, a paper cup is generally used.
The paper cup is generally formed by integrally joining a main body and a bottom body, which are formed from paper blanks cut into predetermined shapes. In more detail, the trunk is formed as follows: the substantially fan-shaped body blank is formed into a tubular shape by overlapping and joining both end edge portions thereof, and a folded portion folded inward is formed at a lower end opening edge portion and a flange portion curled outward is formed at an upper end opening edge portion. The bottom body is: the blank for a substantially circular bottom body is formed into a skirt shape so as to form a hanging portion on the outer peripheral portion thereof (Japanese: スカ - ト molding), and has a substantially inverted U-shaped cross section. The hanging part of the bottom body is wrapped by the folded part of the trunk body and joined, whereby the trunk body and the bottom body are integrated.
Each of the blanks for the trunk and the base is formed of, for example, a laminate having a paper layer (which is formed of a plain base paper, a sour paper, a coated paper, or the like) and a polyethylene resin (PE) layer laminated on one surface or both surfaces of the paper layer (see, for example, patent document 1 below).
Further, as a material of each of the above-described blanks, a paper cup using a laminate in which a barrier layer formed of an aluminum foil or the like is laminated in addition to a paper layer and a polyethylene resin (PE) layer is also known (for example, see patent document 2 below).
Further, as containers for ice cream, yogurt, and the like, containers formed of plastic molded bodies such as polypropylene resin (PP) are also known (see, for example, patent document 3 below).
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent application laid-open No. Sho 58-30955
[ patent document 2] Japanese patent laid-open No. 2007 & 210639
[ patent document 3] Japanese patent application laid-open No. 2007-176505
Disclosure of Invention
Problems to be solved by the invention
However, paper cups have excellent productivity and can be produced at low cost, but have low barrier properties and are not suitable for long-term storage of contents.
In the case of a paper cup to which a barrier layer such as aluminum foil is added, although the long-term storage stability of the contents is improved, water easily enters from the end face of the paper layer, and retort sterilization cannot be performed.
In addition, in the case of a plastic container, the cost of manufacturing facilities increases, and the container is not suitable for long-term storage of the contents.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a cup-shaped container which can be manufactured at low cost by using a manufacturing facility for a cup-shaped container mainly made of paper, has excellent long-term storage stability of contents, and can be subjected to aseptic sterilization or retort sterilization.
Means for solving the problems
The present invention includes the following means for achieving the above object.
1) A cup-shaped container formed of a trunk body molded into a cylindrical shape by overlapping and joining both end edge portions of a blank for the trunk body with each other and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by molding the blank for the bottom body so as to form a suspended portion at an outer peripheral portion thereof, and joined to an outer surface of the suspended portion of the bottom body at an inner surface of a lower end portion of the trunk body, whereby the trunk body and the bottom body are integrated,
the blank for a trunk is formed of a laminate having a metal foil layer without a paper layer and heat-fusible resin layers laminated on both surfaces of the metal foil layer, the overlapped both end edge portions of the blank for a trunk are joined by heat-fusing the heat-fusible resin layers constituting the surfaces of the overlapped both end edge portions to each other, the metal foil layers of the both end edge portions are laminated via the heat-fusible resin layers,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the upper surface of the base body out of both surfaces of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the bottom portion of the base body are joined by heat-fusing the heat-fusible resin layers constituting the surfaces thereof, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the bottom portion of the base body are laminated via the heat-fusible resin layer.
2) The cup-shaped container according to the above 1), wherein the bottom body is formed by drawing a bottom body blank.
3) The cup-shaped container according to 1) or 2) above, wherein the flange portion is folded downward and formed into a flat shape.
4) The cup-shaped container according to 1) or 2) above, wherein the flange portion is formed to have a substantially circular arc-shaped cross section by being curled downward.
5) The cup-shaped container according to any one of 1) to 4) above, wherein, of the end edge portions of the body blank, an inner end edge portion that becomes a main body is folded back so as to overlap a surface of the body blank that becomes an outer side of the main body, and is heat-welded to the surface.
6) The cup-shaped container according to any one of 1) to 5) above, wherein the thickness of the metal foil layer forming the laminate of the body blank is 40 to 200 μm, and the thickness of the metal foil layer forming the laminate of the body blank is 40 to 200 μm.
7) The cup-shaped container according to any one of 1) to 6), wherein the thickness of the heat-fusible resin layer laminated on both surfaces of the metal foil layer in the laminated body forming the body blank is 5 to 80 μm, and the thickness of the heat-fusible resin layer laminated on the upper surface of the base in the laminated body forming the base blank is 5 to 80 μm.
8) The cup-shaped container according to any one of 1) to 7), wherein the total thickness of the heat-fusible resin layers heat-fused to each other at both end edge portions of the body material is 8 to 150 μm in the overlapped portion of the body material.
9) The cup-shaped container according to any one of 1) to 8) above, wherein, in the overlapped portion of the trunk body, the overlapping width of the metal foil layers at both end edge portions of the trunk body blank as viewed in the thickness direction is 2 to 10 mm.
10) The cup-shaped container according to any one of 1) to 9) above, wherein the stem further comprises a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the fold-back portion of the main body and the hanging portion of the bottom body are joined by heat-welding heat-sealable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and a metal foil layer of the fold-back portion is laminated on the inner side of the heat-sealable resin layers.
11) The cup-shaped container according to 10) above, wherein the thickness of the heat-fusible resin layer laminated on the lower side of the base body out of the two surfaces of the metal foil layer in the laminated body forming the base body blank is 5 to 80 μm.
12) A cup-shaped container formed of a trunk body molded into a cylindrical shape by overlapping and joining both end edge portions of a blank for the trunk body with each other and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by molding the blank for the bottom body so as to form a suspended portion at an outer peripheral portion thereof, and joined to an outer surface of the suspended portion of the bottom body at an inner surface of a lower end portion of the trunk body, whereby the trunk body and the bottom body are integrated,
the body material is formed by cutting a laminate having a metal foil layer without a paper layer and heat-fusible resin layers laminated on both surfaces of the metal foil layer into a size 2 times as long as a predetermined length, folding the laminate in two at the center of the length, laminating the laminate, and heat-fusible resin layers constituting the laminated surfaces, wherein both end edges of the body material are overlapped so that the end edges on the folded side become the inner side of the body, and the heat-fusible resin layers constituting the surfaces overlapped with each other are heat-fused to each other, and the metal foil layers of both end edges are laminated via the heat-fused heat-fusible resin layers,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the upper surface of the base body out of both surfaces of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the bottom portion of the base body are joined by heat-fusing the heat-fusible resin layers constituting the surfaces thereof, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the bottom portion of the base body are laminated via the heat-fusible resin layer.
13) The cup-shaped container according to 12) above, wherein the bottom body is formed by drawing a bottom body blank.
14) The cup-shaped container of the above 12) or 13), wherein the flange portion is folded downward and formed into a flat shape.
15) 12) or 13) above, wherein the flange portion is formed into a substantially arc-shaped cross section by being curled downward.
16) The cup-shaped container according to any one of the above 12) to 15), wherein the trunk further includes a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the fold-back portion of the main body and the hanging portion of the bottom body are joined by heat-welding the heat-sealable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and the metal foil layer of the fold-back portion is laminated on the inner side of the heat-sealable resin layers.
17) A cup-shaped container formed of a main body molded into a cylindrical shape by joining both end edge portions of a main body blank overlapped and aligned with each other and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by forming a bottom body blank into a suspended portion at an outer peripheral portion thereof, and integrated with the bottom body by joining an outer surface of the suspended portion of the bottom body to an inner surface of a lower end portion of the main body,
the body material is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the inner surface of the metal foil layer, both end edge portions of the body material overlapped in a coupled state are bonded by heat-fusing the heat-fusible resin layers to each other, the metal foil layers at both end edge portions are laminated via the heat-fusible resin layer by heat-fusing,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on an upper surface of the base body out of both surfaces of the metal foil layer, an inner surface of a lower end portion of the main body and an outer surface of a hanging portion of the base body are bonded by heat-fusing the heat-fusible resin layers to each other, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the hanging portion of the base body are laminated via the heat-fusible resin layer.
18) The cup-shaped container according to 17) above, wherein the bottom body is formed by drawing a bottom body blank.
19) 17) or 18) above, wherein the laminate forming the body blank further has a heat-fusible resin layer laminated on an outer surface of the body out of both surfaces of the metal foil layer,
the mating part of the main body is bent to one side in a manner of overlapping the outer surface of the main body and is heat-welded to the outer surface.
20) The cup-shaped container according to any one of the above 17) to 19), wherein the flange portion is folded downward and formed into a flat shape.
21) The cup-shaped container described in any one of the above 17) to 19), wherein the flange portion is formed into a substantially arc-shaped cross section by being curled downward.
22) The cup-shaped container according to any one of the above 17) to 21), wherein the trunk further includes a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the fold-back portion of the main body and the hanging portion of the bottom body are joined by heat-welding heat-sealable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and a metal foil layer of the fold-back portion is laminated on the inner side of the heat-sealable resin layers.
23) A laminated body for a cup-shaped container, which is used as a material for each of a body blank and a bottom blank in the following cup-shaped container,
the cup-shaped container is formed by a main body and a bottom body with a roughly inverted U-shaped cross section, the outer surface of the vertical part of the bottom body is jointed on the inner surface of the lower end part of the main body, thereby the main body and the bottom body are integrated, the main body is formed into a cylinder shape by jointing two end edge parts of a blank for the main body in an overlapping mode or a overlapping mode, and the main body is jointed in an involution mode, and a flange part bent outwards is arranged on the upper end opening edge part, the bottom body with the roughly inverted U-shaped cross section is formed by forming the blank for the bottom body in a mode of forming the vertical part on the outer periphery part of the bottom body,
the laminated body for the cup-shaped container comprises a metal foil layer and a heat-fusible resin layer laminated on at least one surface of two surfaces of the metal foil layer, but does not comprise a paper layer.
Effects of the invention
The cup-shaped container according to 1) above is formed by a laminate having a metal foil layer and a heat-fusible resin layer laminated on both surfaces thereof, and the base body blank is formed by a laminate having a metal foil layer and a heat-fusible resin layer laminated on one of the two surfaces of the metal foil layer which is the upper surface of the base body.
In addition, in the cup-shaped container according to the above 1), since the laminated body which becomes the material of each material has the metal foil layer, the long-term storage stability of the content is excellent.
In the cup-shaped container according to 1) above, since the laminated body of the materials to be the respective blanks does not have a paper layer, retort sterilization can be performed.
In addition, according to the cup-shaped container of the above 1), excellent sealing property and barrier property can be obtained at the overlapped portion of the trunk body and the joint portion of the lower end portion of the trunk body and the hanging portion of the bottom body.
The following effects can be obtained by the cup-shaped container of 2) above.
That is, in the case of the conventional paper cup, wrinkles are likely to be generated when the bottom body blank is formed into a substantially inverted U-shaped cross section, and a poor bonding between the hanging portion of the bottom body and the lower end portion of the main body is generated due to the wrinkles, and there is a possibility that the barrier property is lowered. In addition, when aseptic (aseptic) filling is performed using a paper cup, the sterilizing liquid tends to remain at the boundary portion between the main body and the bottom body at the bottom of the paper cup. This is considered to be because, when a bottom body blank mainly made of paper is molded, the paper is broken at the corner portion between the bottom portion and the hanging portion, and it is difficult to form the corner of the corner portion.
In contrast, in the cup-shaped container according to the above 2), since the base body is formed by drawing a base body blank (which is formed of a laminate having a metal foil layer and a heat-fusible resin layer without a paper layer), wrinkles are not generated in the base body, and therefore, the following can be reliably prevented: poor connection between the hanging part of the bottom body and the lower end part of the trunk body occurs, or barrier property is reduced. In addition, according to the cup-shaped container of 2) above, since the corner portion between the bottom portion and the hanging portion in the bottom body is easily formed, even in the case of performing aseptic (aseptic) filling, the sterilizing liquid does not remain at the boundary portion between the trunk body and the bottom body in the bottom portion.
In the cup-shaped container according to the above-mentioned 3) or 4), since the end face of the body blank is not exposed to the tip end side of the flange portion of the main body, for example, when the content is a beverage, the flange portion can function as a drinking portion without hindrance.
In the cup-shaped container according to 5) above, the end surface of the metal foil layer does not contact the content stored in the container in the overlapping portion of the trunk body, and therefore corrosion can be suppressed.
The cup-shaped container according to the above 6), sufficient barrier properties and moldability can be obtained.
The cup-shaped container according to the above 7), it is possible to obtain sufficient adhesive strength at the joint portion of the overlapping portion of the trunk body and the lower end portion of the trunk body and the hanging portion of the bottom body. In addition, according to this container, the difference in level of the portion of the upper surface of the flange portion of the main body, which portion is formed by the overlapped portion, can be made gentle, and therefore, sealing performance at the time of sealing with the lid material becomes excellent.
The cup-shaped container according to the above 8) can provide excellent barrier properties while securing sealability at the overlapping portion of the trunk unit, and can further improve long-term storage properties of the contents.
In the cup-shaped container according to the above 9), since the overlapping width is set to 2mm or more, the sealing property can be secured and an excellent barrier property can be provided at the overlapping portion of the trunk body, and the long-term storage property of the contents can be further improved. In addition, according to this container, since the overlapping width is set to 10mm or less, it is possible to suppress an increase in cost due to an unnecessarily large width of the overlapping portion, and also to suppress occurrence of appearance defects such as wrinkles in the inner portion of the overlapping portion due to a difference in stress applied to the inner portion and the outer portion of the overlapping portion.
The cup-shaped container according to 10) above can suppress corrosion because the bondability between the lower end portion of the trunk body and the suspended portion of the bottom body is improved, the sealability and the barrier property at the bonded portion between the trunk body and the bottom body are improved, and the end faces of the metal foil layers of the trunk body blank and the bottom body blank are not exposed downward in the lower end portion of the container.
The cup-shaped container according to 11) above can provide excellent barrier properties while securing sealability at the joint between the folded portion of the main body and the suspended portion of the bottom body, and can further improve the long-term storage stability of the contents.
The cup-shaped container according to the above 12) can achieve substantially the same effects as the cup-shaped container according to the above 1).
In addition, the barrier property of the trunk body is significantly improved by the cup-shaped container.
Further, according to the cup-shaped container, since the end face of the metal foil layer does not come into contact with the content stored in the container in the overlapping portion of the trunk body, corrosion can be suppressed.
The cup-shaped container according to the above 13) can obtain substantially the same effects as the cup-shaped container according to the above 2).
The cup-shaped container according to 14) or 15) described above can achieve substantially the same effects as those of the cup-shaped container according to 3 or 4) described above.
The cup-shaped container of 16) above can achieve substantially the same effects as those of the cup-shaped container of 10) above.
The cup-shaped container according to the above 17) can achieve substantially the same effects as the cup-shaped container according to the above 1).
In addition, according to the cup-shaped container, since the end face of the metal foil layer does not contact the content stored in the container in the mating portion of the trunk body, corrosion can be suppressed.
The cup-shaped container according to 18) above can achieve substantially the same effects as those of the cup-shaped container according to 2) above.
The cup-shaped container according to the above 19) has improved sealability and barrier properties in the mating portion of the main body because the mating portion is bent to one side and heat-welded to the outer surface of the main body.
In addition, according to this container, since the mating portion does not protrude outward, the appearance is improved and the container can be easily gripped.
The cup-shaped container according to 20) or 21) described above can achieve substantially the same effects as those of the cup-shaped container according to 3) or 4) described above.
The cup-shaped container according to 22) above can achieve substantially the same effects as those of the cup-shaped container according to 10) above.
The laminate for a cup-shaped container according to 23) has the metal foil layer and the heat-fusible resin layer laminated on at least one of the two surfaces thereof, and therefore a body material and a bottom material formed from the laminate can be prepared and inexpensively manufactured by a manufacturing facility for a cup-shaped container mainly made of paper.
Further, the laminated body for a cup-shaped container according to 23) has a metal foil layer, and therefore a cup-shaped container made of the laminated body can be a container having excellent long-term storage stability of contents.
Moreover, the laminated body for a cup-shaped container according to 23) does not include the paper layer, and therefore the cup-shaped container manufactured using the laminated body as a material of each blank can be subjected to retort sterilization.
Drawings
Fig. 1 is a perspective view of a cup-shaped container according to embodiment 1 of the present invention.
Fig. 2 is a vertical sectional view as viewed along line II-II of fig. 1, in which a portion surrounded by a chain line a is shown enlarged by a portion surrounded by a chain line a, and a portion surrounded by a chain line B is shown enlarged by a portion surrounded by a chain line B.
Fig. 3(a) is an enlarged cross-sectional view showing the layer structure of the laminate of the material to be the body material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of the material to be the base material.
Fig. 4 is a horizontal sectional view showing an enlarged overlapping portion of the trunk body in the above cup-shaped container.
Fig. 5(a) is a plan view of a body material, and (b) is a perspective view of a body formed from the body material.
Fig. 6(a) is a plan view of a base material, and (b) is a perspective view of a base formed from the base material.
FIG. 7 is a vertical sectional view showing one of the steps of manufacturing the cup-shaped container.
Fig. 8 is a partially enlarged vertical sectional view showing a modification of the flange portion of the trunk body in the cup-shaped container.
Fig. 9 is a partially enlarged vertical sectional view showing a modification of the coupling structure between the trunk body and the bottom body in the cup-shaped container.
Fig. 10 is a partially enlarged vertical sectional view showing another mode of the overlapping portion of the trunk body in the cup-shaped container.
Fig. 11 is a horizontal cross-sectional view showing a manufacturing process of the overlapped part in the above-described manner.
Fig. 12 is a horizontal cross-sectional view of a cup-shaped container according to embodiment 2 of the present invention, in which a portion surrounded by a chain line C is shown enlarged by a portion surrounded by a chain line C.
FIG. 13 is a perspective view showing a part of the process of manufacturing the trunk of the cup-shaped container.
Fig. 14 is a horizontal cross-sectional view of a cup-shaped container according to embodiment 3 of the present invention, in which a portion surrounded by a dashed line D is shown enlarged by a portion surrounded by a dashed line D.
FIG. 15 is a horizontal cross-sectional view showing a part of the process of manufacturing the stem of the cup-shaped container.
Description of the reference numerals
1. 1X, 1Y: cup-shaped container
2. 2X: trunk body
2 a: lower end of the trunk body
21: overlap portion
21Y: involution part
22: turnover part
23. 23X: flange part
20A, 20B: blank for trunk body
20: laminated body
201: metal foil layer
202: heat-fusible resin layer
204: folded over end lip
205: the other end edge part
204B: end edge part of the turning side
205B: the other end edge part
T1: total thickness of thermally-fusible resin layers thermally fused to each other at both end edges of a body material
W1: overlapping width of metal foil layers at both end edges of body blank as viewed from thickness direction
3: bottom body
31: bottom part
32: the lower part of the drop
30A: blank for base
30: laminated body
301: metal foil layer
302: heat-fusible resin layer
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to fig. 1 to 15.
[ embodiment 1]
Fig. 1 and 2 are views showing the overall configuration of a cup-shaped container 1 according to embodiment 1 of the present invention, in which the cup-shaped container 1 is formed by integrally joining a stem body 2 and a bottom body 3, the stem body 2 is formed by molding a stem body blank 20A, and the bottom body 3 is formed by molding a bottom body blank 30A.
The trunk body 2 has a tapered cylindrical shape, and as shown in fig. 5, is formed by overlapping and joining both end edge portions of a blank 20A for a trunk body having a fan shape. Therefore, an overlapping portion 21 extending in the height direction thereof exists in the main body 2.
A folded portion 22 folded inward is formed at the lower end opening edge portion of the trunk 2.
Further, a flange portion 23 bent outward is provided at an upper end opening edge portion of the trunk body 2. The flange 23 is folded downward and formed into a substantially horizontal flat shape. As shown in fig. 8 as a modification, the flange portion 23X may be formed to have a substantially arc-shaped cross section by being curled downward.
The bottom body 3 has a circular horizontal bottom portion 31 and a hanging portion 32 extending downward from the outer peripheral edge of the bottom portion 31, and the bottom body 3 has a substantially inverted U-shaped cross section, and as shown in fig. 6, the bottom body 3 is formed by drawing a circular bottom body blank 30A so that the hanging portion 32 is formed on the outer peripheral portion thereof.
Further, the outer surface of the hanging portion 32 of the bottom body 3 is joined to the inner surface of the lower end portion 2a of the trunk body 2, and the folded portion 22 of the trunk body 2 is joined to the inner surface of the hanging portion 32, whereby the trunk body 2 and the bottom body 3 are integrated (see fig. 2 and 7).
As shown in fig. 9 as a modification, the following configuration may be adopted: the flap 22 is not formed at the lower end opening edge of the main body 2, and the main body 2 and the bottom body 3 are integrated by a coupling structure in which only the inner surface of the lower end portion 2a of the main body 2 and the outer surface of the hanging portion 32 of the bottom body 3 are joined. With the configuration of this modification, even when the hanging portion 32 is slightly wrinkled during molding of the bottom body 3, the lower end portion 2a of the trunk body 2 and the hanging portion 32 of the bottom body 3 can be reliably sealed without air or the like being mixed in.
As shown in fig. 3(a), the body material 20A is formed of a laminate 20 having no paper layer, and having a metal foil layer 201 and a heat-fusible resin layer 202 laminated on both surfaces of the metal foil layer 201.
As shown in fig. 3(b), the base material 30A is formed of a laminate 30 having no paper layer, and having a metal foil layer 301 and heat-fusible resin layers 302 laminated on both surfaces of the metal foil layer 301.
The thickness of each laminate 20, 30 is preferably less than 250 μm, more preferably less than 200 μm. By setting the thickness of each laminate 20, 30 within the above range, the following problems can be avoided with certainty, as in a paper cup using a laminate having a thickness of about 250 to 400 μm as a material for a blank: the flange portion 23 of the trunk body 2 has a large step in the portion formed by the overlapping portion 21, and the lower end portion 2a and the folded portion 22 of the trunk body 2 are not stably joined to the hanging portion 31 of the bottom body 3.
The metal foil layers 201 and 301 function as barrier layers for protecting the contents from gas, water vapor, light, and the like.
As the metal foil constituting the metal foil layers 201 and 301, aluminum foil, iron foil, stainless steel foil, copper foil, and the like can be used, and aluminum foil is preferably used. In the case of the aluminum foil, any of pure aluminum foil and aluminum alloy foil may be used, and any of soft and hard aluminum foil may be used, and for example, a soft material (O material) subjected to annealing treatment of a8000 series (particularly a8079H and a8021H) classified according to JIS H4160 is excellent in formability and thus can be preferably used.
Both surfaces of the metal foil layers 201 and 301 may be subjected to a base treatment such as a chemical conversion treatment as needed. Specifically, for example, the surface of the degreased metal foil is coated with any one of aqueous solutions 1) to 3) below and then dried to perform chemical conversion treatment, thereby forming a coating film:
1) an aqueous solution of a mixture comprising:
phosphoric acid;
chromic acid; and
at least 1 compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride,
2) an aqueous solution of a mixture comprising:
phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan (chitosan) derivative resins, and phenolic resins; and
at least 1 compound selected from the group consisting of chromic acid and chromium (III) salts,
3) an aqueous solution of a mixture comprising:
phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins;
at least one compound selected from the group consisting of chromic acid and chromium (III) salts; and
at least one compound selected from the group consisting of metal salts of fluoride and non-metal salts of fluoride.
The coating film formed on the surface of the metal foil layer 201, 301 by the chemical conversion treatment preferably has a chromium adhesion amount (per surface) of 0.1mg/m2～50mg/m2Particularly preferably 2mg/m2～20mg/m2。
The thickness of the metal foil layers 201, 301 is preferably 40 to 200 μm, more preferably 80 to 160 μm. When the thickness of the metal foil layers 201 and 301 is within the above range, sufficient barrier properties and moldability can be obtained.
The heat-fusible resin layers 202 and 302 constitute the inner and outer surfaces of the container 1, serve to protect the metal foil layers 201 and 301, and impart deep drawability to the laminated bodies 20 and 30, and function as heat-fusible layers when joining the end edge portions of the trunk body blank 20A and the lower end portion 2a and the folded portion 22 of the trunk body 2 to the hanging portion 32 of the bottom body 3.
The heat-fusible resin layers 202 and 302 are made of a general-purpose film such as a polypropylene resin (PP) film or a polyethylene resin (PE) film having heat-fusible properties, or a composite film obtained by laminating them, and particularly, an unstretched polypropylene resin film (CPP) having excellent heat resistance and stretch moldability is preferable. The heat-fusible resin layers 202 and 302 may be formed with a coating layer of a maleic acid-modified polyethylene resin, a maleic acid-modified polypropylene resin, an ethylene-vinyl acetate resin, an epoxy resin, a shellac resin, or the like, instead of the film.
The thickness of the heat-fusible resin layers 202 and 302 is preferably 5 to 80 μm, and more preferably 10 to 60 μm. By setting the thickness of the heat-fusible resin layers 202 and 302 within the above range, sufficient adhesive strength can be obtained at the joint portion between the both end edge portions of the body material 20A, the joint portion between the lower end portion 2a of the main body 2 and the folded-over portion 22 and the hanging portion 32 of the bottom body 3, and the difference in layer of the portion of the upper surface of the flange portion 23 of the main body 2 constituted by the folded-over portion 21 can be made gentle, and sealing property at the time of sealing with the lid material can be improved.
The lamination of the metal foil constituting the metal foil layers 201 and 301 and the film constituting the heat-fusible resin layers 202 and 302 can be performed by, for example, a dry lamination method via an adhesive layer (not shown). For example, a two-part curable polyester-urethane resin adhesive or polyether-urethane resin adhesive can be used for the adhesive layer.
The laminate 20 constituting the body material 20A and the laminate 30 constituting the base material 30A may be the same laminate in general, or may be different in material and/or thickness.
Next, an example of a method for forming cup-shaped container 1 using the above-described laminated bodies 20 and 30 will be described.
First, the laminated body 20 is punched out into a fan shape having a predetermined size to form a body blank 20A (see fig. 5 (a)).
The laminated body 30 is punched out into a circular shape having a predetermined size to form a bottom body blank 30A (see fig. 6 a), and the blank 30A is subjected to deep drawing using a die (not shown) to form a bottom body 3 having a substantially inverted U-shaped cross section, which is formed by the bottom portion 31 and the suspended portion 32 (see fig. 6 b). The obtained base body 3 had no wrinkles formed thereon. In addition, the corner portion between the bottom portion 31 and the hanging portion 32 in the outer surface of the bottom body 3 forms a corner.
Then, the base body 3 is placed on the top surface of a substantially truncated cone-shaped mold (not shown) so that the top surface of the bottom portion overlaps the top surface, the body material 20A is wound around the outer peripheral surface of the mold so that both end edge portions thereof overlap each other, and the overlapping portions 21 of the heat-fusible resin layers 202 and 202 overlapping each other are heat-fused to each other, thereby forming the trunk body 2 in a tapered tubular shape. As means for heat-welding the overlapped part 21, high-frequency sealing, ultrasonic sealing, or the like may be used in addition to heat sealing using a hot plate.
Next, the lower end opening edge of the trunk unit 2 is folded inward, the folded portion 22 of the trunk unit 2 is pressed against the hanging portion 32 of the base 3 by a disk-shaped rotary die (not shown), and then the lower end portion 2a of the trunk unit 2 and the heat-fusible resin layers 202 and 302 overlapping each other of the folded portion 22 and the hanging portion 32 of the base 3 are heat-fused to each other, thereby joining and integrating the trunk unit 2 and the base 3.
Finally, the upper end opening edge portion of the trunk body 2 is curled outward using a predetermined curl forming die (not shown), and is pressed in the vertical direction to be formed into a flat shape, thereby forming the flange portion 23.
Thus, the cup-shaped container 1 shown in fig. 1 and 2 is obtained.
In the overlapped part 21 of the trunk body 2 of the cup-shaped container 1, the total thickness T1 of the heat-fusible resin layers 202, 202 heat-fused to each other at both end edge parts of the trunk body blank 20A is preferably 8 to 150 μm, more preferably 16 to 80 μm (see FIG. 4). If the total thickness T1 is less than 8 μm, the sealing performance of the overlap portion 21 may become insufficient. On the other hand, if the total thickness T1 is larger than 150 μm, the barrier property of the overlap portion 21 may be impaired.
In the overlapped part 21 of the trunk body 2, the overlapping width W1 of the metal foil layers 201 at both end edges of the trunk body blank 20A and the metal foil layers 201 as viewed in the thickness direction is preferably 2 to 10mm, and more preferably 4 to 8 mm. If the overlapping width W1 is less than 2mm, the barrier property of the overlap portion 21 may be impaired, and the sealing width may be too small and the sealing property may be insufficient. On the other hand, if the overlapping width W1 is greater than 10mm, the width of the overlap portion 21 becomes unnecessarily large, which leads to an increase in cost, and appearance defects such as wrinkles may occur in the inner portion of the overlap portion 21 due to a difference in stress applied to the inner portion (one end edge portion of the body blank 20A) and the outer portion (the other end edge portion of the body blank 20A) of the overlap portion 21.
According to the cup-shaped container 1 of the embodiment, the following effects can be achieved.
a) Since the body material 20A and the bottom material 30A are each formed of the laminate 20, 30 having the metal foil layers 201, 301 and the heat-fusible resin layers 202, 302 laminated on both surfaces thereof, it can be manufactured inexpensively by a manufacturing facility of a cup-shaped container mainly made of paper.
b) Since the laminated bodies 20 and 30, which are the materials of the respective blanks 20A and 30A, have the metal foil layers 201 and 301, the long-term storage stability of the contents is excellent.
c) Since the thickness of the body blank 20A is reduced, the step of the portion of the upper surface of the flange portion 23 of the body 2, which is formed by the overlap portion 21, can be reduced, and therefore, a sealing failure is less likely to occur when the lid body is sealed to the upper surface of the flange portion 23 of the container 1. In addition, when aseptic (aseptic) filling is performed, the sterilizing liquid is less likely to remain on the level difference portion on the upper surface of the flange portion 23.
d) Since the bottom body 3 is formed by deep drawing the bottom body blank 30A, wrinkles are not generated in the bottom body 3, and therefore, a poor bonding between the hanging portion 32 of the bottom body 3 and the lower end portion 2a and the folded-over portion 22 of the trunk body 2 or a reduction in barrier properties unlike a conventional paper cup is not generated.
e) Since the thicknesses of the body blank 20A and the bottom blank 30A are reduced, the lower end portion 2a and the folded portion 22 of the body 2 and the hanging portion 32 of the bottom 3 can be stably joined.
f) Since the corner portion between the bottom portion 31 and the hanging portion 32 is formed in the outer surface of the bottom body 3, when aseptic (aseptic) filling is performed, the sterilizing liquid is less likely to remain in the boundary portion between the upper surface of the bottom body 3 of the cup-shaped container 1 and the inner peripheral surface of the stem 2.
g) Since the laminated bodies 20 and 30, which are the materials of the blanks 20A and 30A, have the metal foil layers 201 and 301 and the heat-fusible resin layers 202 and 302 but do not have paper layers, retort sterilization can be performed.
Fig. 10 is a view showing another mode of the overlapping portion 21 of the main body 2 in the cup-shaped container 1.
In the cup-shaped container 1 shown in the figure, the end edge portion 204 on the inner side of the main body 2 out of the end edge portions of the main body blank 20A is folded back so as to overlap the surface of the main body blank 20A on the outer side of the main body 2 and is heat-welded to the surface, and the folded end edge portion 204 and the other end edge portion 205 are overlapped with each other, and the heat-weldable resin layers 202 of the end edge portions 204 and 205 overlapped with each other are heat-welded to each other (see fig. 10 and 11).
The folded width of the folded end edge portion 204 and the overlapping width of the both end edge portions 204 and 205 may be substantially the same as in fig. 10 and 11, and may be different from each other.
The heat welding of the folded end edge portion 204 and the heat welding of the both end edge portions 204 and 205 are preferably performed simultaneously in 1 heat welding step, whereby the number of steps can be reduced and the productivity can be improved.
According to the above-described aspect, since the end surface of the metal foil layer 201 does not contact the content stored in the container 1 in the overlapping portion 21 of the main body 2, corrosion can be suppressed.
[ 2 nd embodiment ]
Fig. 12 and 13 show a cup-shaped container 1X according to embodiment 2 of the present invention. This cup-shaped container 1X is substantially the same as the cup-shaped container 1 of embodiment 1 shown in fig. 1 to 9, except for the following points.
That is, in the case of the cup-shaped container 1X of the present embodiment, the body material 20B is formed as follows: the laminated body 20 having no paper layer and having the metal foil layer 201 and the heat-fusible resin layers 202 laminated on both faces of the metal foil layer 201 is cut into a size having a length 2 times as long as a prescribed length, and is folded in half at the center of the length to be laminated, and the heat-fusible resin layers 202 constituting the laminated faces are heat-fused to each other (see fig. 13).
The opposite end edges 204B and 205B of the body blank 20B are overlapped so that the folded-back end edge 204B is located inside the trunk 2X, and the heat-fusible resin layers 202 constituting the surfaces of the opposite end edges 204B and 205B that overlap each other are heat-fused to join each other, and the metal foil layers 201 of the opposite end edges 204B and 205B are laminated via the heat-fusible resin layers 202 through heat fusion (see fig. 12).
In the cup-shaped container 1X, since 2 metal foil layers 201 are stacked in the portion of the main body 2X other than the overlapped portion 21 and a total of 4 metal foil layers 201 are stacked in the overlapped portion 21, the barrier property of the main body 2X is greatly improved and the long-term storage property of the contents can be further improved.
In addition, according to the cup-shaped container 1X described above, since the end surface of the metal foil layer 201 does not come into contact with the content stored in the container 1X in the overlapped portion 21 of the trunk body 2X, corrosion can be suppressed.
[ embodiment 3]
Fig. 14 and 15 are views showing a cup-shaped container 1Y according to embodiment 3 of the present invention. This cup-shaped container 1Y is substantially the same as the cup-shaped container 1 of embodiment 1 shown in fig. 1 to 9, except for the following points.
That is, in the cup-shaped container 1Y of this embodiment, the trunk 2 is formed into a tubular shape by overlapping and joining both end edge portions of the trunk blank 20A with each other (see fig. 15 (a)). More specifically, the opposite end edges of the stacked and coupled body material 20A are joined by heat-welding the heat-sealable resin layers 202 to each other, and the metal foil layers 201 at the opposite end edges are laminated via the heat-sealable resin layers 202.
The mating portion 21Y of the main body 2 is bent to one side so as to overlap with the outer surface of the main body 2 and is heat-welded to the outer surface (see fig. 15 (b)).
In the cup-shaped container 1Y, the end surface of the metal foil layer 201 in the mating portion 21Y of the main body 2 does not contact the contents stored in the container 1Y, and therefore corrosion can be suppressed.
In addition, according to the cup-shaped container 1Y described above, since the mating portion 21Y of the main body 2 is bent to one side and is heat-welded to the outer surface of the main body 2, the sealing property and the barrier property of the portion are improved. In addition, since the mating portion does not protrude outward in the cup-shaped container 1Y, the appearance is improved and the cup-shaped container is easy to hold.
Examples
Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.
< example 1>
About 3g/m of aluminum foil (A8021H-O) having a thickness of 100 μm was coated on each of the two surfaces subjected to the chemical conversion treatment2The 2 nd liquid curable polyurethane adhesive (A) was prepared by dry laminating an unstretched polypropylene resin film (CPP) having a thickness of 30 μm. Then, a predetermined aging treatment is performed to cure the adhesive, thereby obtaining a laminate.
Next, the obtained laminate is punched out into a predetermined shape, and molded into a body material and a bottom material (see fig. 5 and 6).
Then, a cup-shaped container shown in fig. 1 and 2 was produced as example 1 by the same steps as in embodiment 1 described above using a body material and a bottom material. The cup-shaped container obtained was a container which was almost impermeable to oxygen and water vapor and had good barrier properties because an aluminum foil having a thickness of 100 μm was used.
Note that the size of the cup-shaped container is as shown below.
(size of cup-shaped Container)
Inner diameter of opening of upper portion of cup-shaped container: 65mm
Inner diameter of lower part of cup-shaped container: 50mm
Width of flange portion: 4mm
Height of the cup-shaped container: 95mm
Height of leg (folded part (22)) of cup-shaped container: 6mm
< example 2>
About 3g/m of aluminum foil (A8021H-O) having a thickness of 100 μm was coated on each of the two surfaces subjected to the chemical conversion treatment2The 2 nd liquid curable polyurethane adhesive (2) was prepared by dry laminating a linear low density polyethylene resin film (LLDPE) having a thickness of 30 μm. Then, a predetermined aging treatment is performed to cure the adhesive, thereby obtaining a laminate.
Then, a cup-shaped container was produced in the same manner as in example 1 except for the above, and this was defined as example 2.
< example 3>
On one side of an aluminum foil (A8021H-O) having a thickness of 100 μm and having both sides subjected to chemical conversion treatment, about 3g/m was coated2The 2-pack type curable polyurethane adhesive (B) was prepared by dry laminating an unstretched polypropylene resin film (CPP) having a thickness of 30 μm and coating the other surface of the aluminum foil with about 3g/m2The 2 nd liquid curable polyurethane adhesive (A) was prepared by dry laminating a 50 μm thick unstretched polypropylene resin film (CPP). Then, a predetermined aging treatment is performed to cure the adhesive, thereby obtaining a laminate.
Next, the obtained laminate is punched out into a predetermined shape, and molded into a body material and a bottom material (see fig. 5 and 6).
Next, one end edge portion of the body blank was folded over at a width of 5mm toward the CPP film side having a thickness of 30 μm and press-molded, and then the other end edge portion was overlapped with the outside of the folded-over one end edge portion and ultrasonically sealed, thereby forming a cylindrical body having an outer surface formed of a CPP film having a thickness of 30 μm and an inner surface formed of a CPP film having a thickness of 50 μm (see fig. 10 and 11).
Then, a cup-shaped container was produced in the same manner as in example 1 except for the above, and this was defined as example 3.
< comparative example 1>
A laminate was obtained in the same manner as in example 1, except that a 210 μm thick cardboard was used instead of 100 μm thick aluminum foil (a8021H-O) which had been subjected to chemical conversion treatment on both sides, corona treatment was applied to both sides of the cardboard, and then a 20 μm thick linear low density polyethylene resin film (LLDPE) was laminated by extrusion lamination.
Then, a cup-shaped container was produced in the same manner as in example 1 except for the above, and this was defined as comparative example 1.
(retort Sterilization test)
In the cup-shaped containers of examples 1 and 3, water as the content was filled to about 3mm below the flange portion.
As a lid material, the following materials were prepared: the biaxially stretched polyethylene terephthalate film (thickness: 12 μm), the aluminum foil (thickness: 20 μm), and the unstretched polypropylene resin film (CPP, thickness: 30 μm) constituting the heat seal layer were laminated in this order from the outside by a dry lamination method using a 2-pack curable polyurethane adhesive, and the resulting laminate was punched into a predetermined shape.
Then, the lid material was heat-sealed to the flange portion of each cup-shaped container by a ring sealer, thereby obtaining a filled packaging container.
A filled packaging container was obtained in the same manner as in the cup-shaped containers of examples 1 and 3, except that a linear low-density polyethylene resin film (LLDPE, thickness 30 μm) was used as the heat seal layer of the lid material in the cup-shaped containers of example 2 and comparative example 1.
The obtained filled packaging containers were subjected to retort sterilization at 110 ℃ for 30 minutes using a steam retort, and were taken out of the retort after cooling.
As a result of the retort sterilization treatment by the above-described method, the filled packaging containers of examples 1 to 3 exhibited no seal leakage, container deformation, interlayer peeling of the laminated body for a cup-shaped container, and the like, and thus showed suitability for retort sterilization.
On the other hand, the filled packaging container of comparative example 1 had a seal leak, and moisture entered the paperboard layer of the laminated body for cup-shaped containers, causing blistering and delamination of the laminated body.
Industrial applicability
The present invention can be suitably used for a cup-shaped container containing, for example, a fluid food, a beverage, or the like, and a laminate used as a material for the cup-shaped container.

Claims (23)

1. A cup-shaped container formed of a trunk body molded into a cylindrical shape by overlapping and joining both end edge portions of a blank for the trunk body with each other and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by molding the blank for the bottom body so as to form a suspended portion at an outer peripheral portion thereof, and joined to an outer surface of the suspended portion of the bottom body at an inner surface of a lower end portion of the trunk body, whereby the trunk body and the bottom body are integrated,
the blank for a trunk is formed of a laminate having a metal foil layer without a paper layer and heat-fusible resin layers laminated on both surfaces of the metal foil layer, the overlapped both end edge portions of the blank for a trunk are joined by heat-fusing the heat-fusible resin layers constituting the surfaces of the overlapped both end edge portions to each other, the metal foil layers of the both end edge portions are laminated via the heat-fusible resin layers,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the upper surface of the base body out of both surfaces of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the bottom portion of the base body are joined by heat-fusing the heat-fusible resin layers constituting the surfaces thereof, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the bottom portion of the base body are laminated via the heat-fusible resin layer.
2. The cup-shaped container according to claim 1, wherein the bottom body is formed by drawing a bottom body blank.
3. The cup-shaped container according to claim 1, wherein the flange portion is folded downward and formed into a flat shape.
4. The cup-shaped container according to claim 1, wherein the flange portion is formed to have a substantially circular arc shape in cross section by being curled downward.
5. The cup-shaped container according to claim 1, wherein an inner one of both end edge portions of the body blank is folded back so as to overlap a surface of the body blank that is an outer side of the body, and is heat-welded to the surface.
6. The cup-shaped container according to claim 1, wherein the thickness of the metal foil layer forming the laminate of the blank for a trunk is 40 to 200 μm, and the thickness of the metal foil layer forming the laminate of the blank for a base is 40 to 200 μm.
7. The cup-shaped container according to claim 1, wherein the thickness of the heat-fusible resin layer laminated on both surfaces of the metal foil layer in the laminated body forming the blank for a base body is 5 to 80 μm, respectively, and the thickness of the heat-fusible resin layer laminated on the upper surface of the base body in both surfaces of the metal foil layer in the laminated body forming the blank for a base body is 5 to 80 μm.
8. The cup-shaped container as claimed in claim 1, wherein in the overlapped portion of the main body, the total thickness of the heat-fusible resin layers heat-fused to each other at both end edge portions of the blank for the main body is 8 to 150 μm.
9. The cup-shaped container according to claim 1, wherein in the overlapped portion of the trunk body, the overlapping width of the metal foil layers at both end edge portions of the blank for the trunk body as viewed from the thickness direction is 2 to 10 mm.
10. The cup-shaped container according to claim 1, wherein the trunk body further has a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the folded part of the main body and the hanging part of the bottom body are bonded by heat-welding the heat-weldable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and the metal foil layer of the folded part is laminated on the inner side of the heat-weldable resin layers.
11. The cup-shaped container according to claim 10, wherein the thickness of the heat-fusible resin layer laminated on the lower side of the base body out of the two surfaces of the metal foil layer in the laminated body forming the base body blank is 5 to 80 μm.
12. A cup-shaped container formed of a trunk body molded into a cylindrical shape by overlapping and joining both end edge portions of a blank for the trunk body, and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by forming a blank for the bottom body so as to form a suspended portion at an outer peripheral portion thereof, and joined to an outer surface of a suspended portion of the bottom body at an inner surface of a lower end portion of the trunk body, whereby the trunk body and the bottom body are integrated,
the body material is formed by cutting a laminate having a metal foil layer without a paper layer and heat-fusible resin layers laminated on both surfaces of the metal foil layer into a size 2 times as long as a predetermined length, folding the laminate in two at the center of the length, laminating the laminate, and heat-fusible resin layers constituting the laminated surfaces, wherein both end edges of the body material are overlapped so that the end edges on the folded side become the inner side of the body, and the heat-fusible resin layers constituting the surfaces overlapped with each other are heat-fused to each other, and the metal foil layers of both end edges are laminated via the heat-fused heat-fusible resin layers,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the upper surface of the base body out of both surfaces of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the bottom portion of the base body are joined by heat-fusing the heat-fusible resin layers constituting the surfaces thereof, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the bottom portion of the base body are laminated via the heat-fusible resin layer.
13. The cup-shaped container according to claim 12, wherein the bottom body is formed by drawing a bottom body blank.
14. The cup-shaped container of claim 12, wherein the flange portion is folded downward and formed in a flat shape.
15. The cup-shaped container according to claim 12, wherein the flange portion is formed to have a substantially circular arc shape in cross section by being curled downward.
16. The cup-shaped container according to claim 12, wherein the trunk body further has a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the fold-back portion of the main body and the hanging portion of the bottom body are joined by heat-welding the heat-sealable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and the metal foil layer of the fold-back portion is laminated on the inner side of the heat-sealable resin layers.
17. A cup-shaped container formed of a main body molded into a cylindrical shape by joining both end edge portions of a blank for the main body in an overlapping and fitting manner and having a flange portion bent outward at an upper end opening edge portion, and a bottom body having a substantially inverted U-shaped cross section molded by forming a blank for the bottom body in a suspended manner at an outer peripheral portion thereof, and being integrated with the bottom body by joining an outer surface of the suspended portion of the bottom body to an inner surface of a lower end portion of the main body,
the body material is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on the inner surface of the metal foil layer, both end edge portions of the body material overlapped in a coupled state are bonded by heat-fusing the heat-fusible resin layers to each other, the metal foil layers at both end edge portions are laminated via the heat-fusible resin layer by heat-fusing,
the base body blank is formed of a laminate having a metal foil layer without a paper layer and a heat-fusible resin layer laminated on an upper surface of the base body out of both surfaces of the metal foil layer, an inner surface of a lower end portion of the main body and an outer surface of a hanging portion of the base body are bonded by heat-fusing the heat-fusible resin layers to each other, and the metal foil layer of the lower end portion of the main body and the metal foil layer of the hanging portion of the base body are laminated via the heat-fusible resin layer.
18. The cup-shaped container of claim 17, wherein the bottom body is formed by deep drawing a blank for the bottom body.
19. The cup-shaped container according to claim 17, wherein the laminated body forming the blank for the stem body further has a heat-fusible resin layer laminated on an outer side of the stem body out of both surfaces of the metal foil layer,
the involution part of the main body is bent to one side in a manner of overlapping with the outer surface of the main body and is heat-welded to the outer surface.
20. The cup-shaped container of claim 17, wherein the flange portion is folded downward and formed in a flat shape.
21. The cup-shaped container according to claim 17, wherein the flange portion is formed to have a substantially circular arc shape in cross section by being curled downward.
22. The cup-shaped container according to claim 17, wherein the trunk body further has a folded portion folded inward from a lower end opening edge portion thereof so as to wrap a vertical portion of the bottom body,
the laminate for forming the base material further comprises a heat-fusible resin layer laminated on the lower side of the base out of the two surfaces of the metal foil layer,
the fold-back portion of the main body and the hanging portion of the bottom body are joined by heat-welding heat-sealable resin layers constituting the surfaces of the main body and the bottom body which are overlapped with each other, and a metal foil layer of the fold-back portion is laminated on the inner side of the heat-sealable resin layers.
23. A laminated body for a cup-shaped container, which is used as a material for each of a body blank and a bottom blank in the following cup-shaped container,
the cup-shaped container is formed by a main body and a bottom body with a roughly inverted U-shaped cross section, the outer surface of the vertical part of the bottom body is jointed on the inner surface of the lower end part of the main body, thereby the main body and the bottom body are integrated, the main body is formed into a cylinder shape by jointing two end edge parts of a blank for the main body in an overlapping mode or a overlapping mode, and the main body is jointed in an involution mode, and a flange part bent outwards is arranged on the upper end opening edge part, the bottom body with the roughly inverted U-shaped cross section is formed by forming the blank for the bottom body in a mode of forming the vertical part on the outer periphery part of the bottom body,
the laminated body for the cup-shaped container comprises a metal foil layer and a heat-fusible resin layer laminated on at least one surface of two surfaces of the metal foil layer, but does not comprise a paper layer.
CN201910612853.3A 2018-07-10 2019-07-08 Cup-shaped container and laminated body for cup-shaped container Active CN110697196B (en)

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CN110697196A (en) 2020-01-17
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