CN112978003B - Cup-shaped container and method for manufacturing same - Google Patents

Cup-shaped container and method for manufacturing same Download PDF

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Publication number
CN112978003B
CN112978003B CN202011489797.8A CN202011489797A CN112978003B CN 112978003 B CN112978003 B CN 112978003B CN 202011489797 A CN202011489797 A CN 202011489797A CN 112978003 B CN112978003 B CN 112978003B
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China
Prior art keywords
heat
main body
cup
shaped container
base
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CN202011489797.8A
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CN112978003A (en
Inventor
苗村正
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Lishennoco Packaging Co ltd
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Lesonac Packaging Co ltd
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Priority claimed from JP2020194848A external-priority patent/JP2021102488A/en
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Publication of CN112978003A publication Critical patent/CN112978003A/en
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Classifications

    • 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
    • B65D3/28—Other details of walls
    • B65D3/30—Local reinforcements, e.g. metallic rims
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B50/20—Cutting sheets or blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • 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
    • B32B15/085—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 comprising polyolefins
    • 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
    • B32B15/088—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 comprising polyamides
    • 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
    • B32B15/09—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 comprising polyesters
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B65D15/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials
    • B65D15/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums
    • 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
    • B65D3/10—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
    • B65D3/20—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 with end portion of body adapted to be closed, by flattening or folding operations, e.g. formed with crease lines or flaps
    • 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)
  • Wrappers (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

The present invention relates to a cup-shaped container and a method for manufacturing the same. Provided is a cup-shaped container which is excellent in sealability between a main body and a base body, can be manufactured at low cost using a paper cup manufacturing facility, has excellent long-term storage stability of contents, and can be sterilized by aseptic sterilization or retort sterilization. The cup-shaped container includes: a main body formed by overlapping and joining both end edges of a main body blank to each other to form a tubular shape; and a base body formed by molding a blank for the base body to form a base and a hanging portion. The outer surface of the depending portion engages the inner surface of the lower end of the body. The body material and the base material are each formed of a laminate including a metal foil layer and heat-fusible resin layers laminated on both surfaces of the metal foil layer. At least an upper portion of the outer surface of the hanging portion of the base body is provided with a smooth face portion continuous over the entire circumference.

Description

Cup-shaped container and method for manufacturing same
Technical Field
The present invention relates to a cup-shaped container containing food, beverage, etc. such as ice cream and yogurt, and a method for producing the same.
Background
As a container for filling and packaging semisolid dairy products such as ice cream and yogurt, a cup-shaped container made of paper, that is, a paper cup is generally used.
Paper cups are generally formed by joining a main body formed of paper blanks each cut into a predetermined shape to a base body. In more detail, the body is formed as follows: the two end edges of the substantially fan-shaped body material are staggered (overlapped) and joined to form a cylindrical shape, and a folded portion folded inward is formed at the lower end opening edge, and a flange portion curled outward is formed at the upper end opening edge. The base body has a substantially inverted U-shaped cross section and is formed by skirt-forming a substantially circular base body blank so as to form a hanging portion at the outer peripheral portion thereof. Further, the hanging portion of the base is engaged by the folded portion of the main body, thereby integrating the main body with the base.
Each of the blanks for the main body and the base body is formed of, for example, a laminate having a paper layer formed of plain base paper, acid-resistant paper, coated paper, or the like, and a polyethylene resin (PE) layer laminated on one or both sides of the paper layer (for example, see patent document 1 below).
As a material of each blank, a paper cup is also known, in which a laminate of a paper layer and a polyethylene resin (PE) layer and a barrier layer made of aluminum foil or the like is laminated (for example, see patent document 2 below).
As containers for ice cream, yogurt, and the like, containers formed from plastic molded bodies such as polypropylene resin (PP) are also known (for example, see patent document 3 below).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 58-30955
Patent document 2: japanese patent laid-open No. 2007-210639
Patent document 3: japanese patent laid-open No. 2007-17685
Disclosure of Invention
Problems to be solved by the application
However, paper cups are excellent in productivity and can be manufactured at low cost, but on the other hand, they are low in barrier property and are not suitable for long-term storage of contents.
In the case of paper cups with a barrier layer such as aluminum foil, the long-term storage property of the contents is improved, but water easily intrudes from the end face of the paper layer, and steam sterilization is not performed.
In addition, in the case of a plastic container, the manufacturing equipment is costly and is not suitable for long-term storage of the contents.
In order to solve the above-described problems, the present inventors have previously proposed a cup-shaped container using a laminate of a metal foil layer and a heat-fusible resin layer laminated on at least one of both surfaces thereof as a material of each of a base material and a body material (japanese patent application No. 2019-106125).
According to the cup-shaped container, the cup-shaped container can be manufactured at low cost by using the paper cup manufacturing equipment, and the contents are excellent in long-term storage property and can be sterilized by aseptic sterilization or retort sterilization.
Here, in the case of the cup-shaped container, if the seal between the main body and the base is not reliably performed, there is a possibility that the content may leak out.
In the case of the cup container, when the both end edges of the body blank are heat-welded to each other, it is necessary to raise the sealing temperature or increase the sealing time in order to obtain sufficient sealing strength, but there is a possibility that the surface of the both end edges opposite to the heat-welded surface, that is, the surface of the joint portion of the body is roughened by heat, and the appearance of the body is impaired.
The present invention provides a cup-shaped container having excellent sealability between a main body and a base body, which can be manufactured at low cost using paper cup manufacturing equipment, has excellent long-term storage property of contents, and can be sterilized by aseptic sterilization or retort sterilization.
Another object of the present invention is to provide a cup-shaped container which can effectively suppress roughening of the surface of a body caused by thermal welding of both end edges of a body material, and which can provide a body with excellent appearance.
Means for solving the problems
The present invention includes the following means for achieving the above object.
1) A cup-shaped container, comprising:
a main body formed by overlapping and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in the cup-shaped container, the main body and the bottom body are integrated by joining the inner surface of the lower end of the main body to the outer surface of the hanging part of the bottom body,
the body blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the inner side of the body of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the overlapping surfaces of the both end edge portions to each other,
the base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
In the cup-shaped container, a smooth surface portion continuous over the entire circumference is provided on at least an upper portion of an outer surface of the hanging portion of the bottom body.
2) The cup-shaped container according to 1) above, wherein a difference between a thickness of the bottom portion in the bottom body and a thickness of the upper side portion of the hanging portion is 5 μm or less.
3) The cup-shaped container according to 2) above, wherein the thickness of the bottom portion of the base and the thickness of the upper portion of the hanging portion are respectively 0.9 to 1.1 times the thickness of the base material before molding.
4) The cup-shaped container according to any one of the above 1) to 3), wherein the main body further comprises a folding portion which is folded inward from a lower end opening edge portion of the main body so as to wrap a hanging portion of the base body therein and extends upward,
the folded portion of the main body and the hanging portion of the bottom body are joined by heat-welding heat-weldable resin layers constituting mutually overlapping surfaces thereof.
5) The cup-shaped container according to any one of 1) to 4), wherein the laminate forming the body blank has a heat-resistant resin layer laminated on the outer side of the body out of the two sides of the metal foil layer, and the heat-resistant resin layer contains a resin having a melting point higher than the melting point of the resin constituting the heat-fusible resin layer laminated on the inner side of the body out of the two sides of the metal foil layer by 10 ℃ or more.
6) The cup-shaped container according to the above 5), wherein both end edges of the body blank overlap in a palm-like shape and are joined by heat-welding heat-weldable resin layers constituting mutually overlapping surfaces of the both end edges.
7) A cup-shaped container, comprising:
a main body formed by overlapping and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in the cup-shaped container, the main body and the bottom body are integrated by joining the inner surface of the lower end of the main body to the outer surface of the hanging part of the bottom body,
the body blank is formed of a laminate comprising a metal foil layer, a heat-fusible resin layer laminated on the inner side surface of the metal foil layer, and a heat-resistant resin layer laminated on the outer side surface of the metal foil layer, wherein the heat-resistant resin layer contains a resin having a melting point higher than the melting point of the heat-fusible resin constituting the heat-fusible resin layer by 10 ℃ or more, both end edge portions of the body blank are overlapped in a palm-like shape and joined by heat-welding the heat-fusible resin layers constituting the overlapped surfaces of both end edge portions to each other,
The base material is formed of a metal foil layer and a heat-fusible resin layer laminated on at least the upper surface of the base of the metal foil layer, and the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting the surfaces to each other.
8) The cup-shaped container according to the above 6) or 7), wherein the heat-resistant resin layer contains a thermoplastic resin,
the palm-closing portion of the main body is folded to one side so as to overlap with the outer surface of the main body, and is heat-welded to the outer surface.
9) A cup-shaped container, comprising:
a main body formed by overlapping and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in the cup-shaped container, the main body and the bottom body are integrated by joining the inner surface of the lower end of the main body to the outer surface of the hanging part of the bottom body,
the body blank is formed of a laminate comprising a metal foil layer, a heat-fusible resin layer laminated on the inner side surface of the metal foil layer, and a heat-resistant resin layer laminated on the outer side surface of the metal foil layer, wherein the heat-resistant resin layer contains a resin having a melting point higher than the melting point of the heat-fusible resin constituting the heat-fusible resin layer by 10 ℃ or more, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the overlapping surfaces of the both end edge portions with the heat-resistant resin layer by crossing,
The base material is formed of a metal foil layer and a heat-fusible resin layer laminated on at least the upper surface of the base of the metal foil layer, and the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting the surfaces to each other.
10 The cup-shaped container according to any one of the above 5) to 9), wherein the heat-resistant resin layer has a thickness of 5 to 30. Mu.m.
11 A method for producing a cup-shaped container according to 8) above,
the palm-closing portion of the main body is folded to one side so as to overlap with the outer surface of the main body, and is thermally welded to the outer surface by high-frequency sealing.
Effects of the invention
According to the cup-shaped container of 1), since the smooth surface portion continuous over the entire circumference is provided on at least the upper portion of the outer surface of the hanging portion of the base body, and no irregularities such as wrinkles are generated in the upper portion due to molding, no gap is formed in the seal portion formed by heat welding the upper portion and the inner surface of the lower end portion of the main body, and excellent sealability can be obtained, and leakage of the content and deterioration of barrier properties can be effectively suppressed.
The cup-shaped container according to the above 2) can more reliably exhibit the above-described effects obtained by the cup-shaped container of the above 1).
According to the cup-shaped container of 3), the metal foil layer is prevented from being thinned during molding of the base material, and the strength of the base material is reduced, the metal foil layer is broken, and pinholes are formed.
According to the cup-shaped container of the above 4), the joint between the lower end portion of the main body and the hanging portion of the base body is improved, and the sealing property and barrier property at the joint therebetween are improved.
According to the cup-shaped container of the above 5), 7) or 9), the surface of the opposite end edge portions of the body blank, that is, the surface of the joint portion (the palm-joining portion or the staggered portion) of the body, which is the surface opposite to the heat-welded surface, is composed of the heat-resistant resin layer, so that surface roughness due to heat of the opposite end edge portions of the body blank is effectively suppressed, and a body excellent in appearance can be produced.
In the case of specifying the present invention, the "melting point" means a melting peak temperature (Tmp) measured by Differential Scanning Calorimetry (DSC) based on JIS K7121-1987.
According to the cup-shaped container of the above 6) or 7), the heat-sealable resin layers overlapping the both end edges of the main body material in the shape of a palm are heat-sealed to each other, so that, for example, a higher bonding strength can be obtained and the sealability of the main body can be improved as compared with the case where the both end edges of the main body material are staggered and bonded.
The cup-shaped container according to 8) above, the folded palm portion of the main body and the outer surface of the main body overlapped with the palm portion can be easily joined by heat welding without using an adhesive.
In the cup-shaped container according to 8), the palm-engaging portion of the main body is joined to the outer surface of the main body, so that the liquid filled in the container is not obstructed either when the main body of the container is held by a hand or when the liquid is drunk from the upper end opening edge portion of the main body.
According to the cup-shaped container of 10), the metal foil layer of the body material is reliably protected by the heat-resistant resin layer, and in the 8), the folded palm portion of the body and the outer surface of the body overlapping the palm portion can be joined more reliably.
According to the method of manufacturing a cup-shaped container of 11), the joint between the folded palm portion of the body and the outer surface of the body overlapping the palm portion can be reliably performed while avoiding occurrence of surface roughness due to heat.
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 taken along line II-II of fig. 1, in which a portion surrounded by a single-dot chain line a is an enlarged view of a portion surrounded by a single-dot chain line a, and a portion surrounded by a single-dot chain line B is an enlarged view of a portion surrounded by a single-dot chain line B.
Fig. 3 (a) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material.
Fig. 4 is a horizontal cross-sectional view showing an enlarged cross-section of the main body in the cup-shaped container.
Fig. 5 (a) is a plan view of a body blank, and (b) is a perspective view of a body molded from the body blank.
Fig. 6 (a) is a plan view of a base material, and (b) is a perspective view of a base molded from the base material.
Fig. 7 is a perspective view showing 2 modes of the outer surface of the hanging portion of the base body.
Fig. 8 is a vertical sectional view sequentially showing a molding process of the base.
Fig. 9 is a vertical sectional view showing a part of the base body in an enlarged manner.
Fig. 10 is a vertical sectional view showing a part of the process of manufacturing the cup-shaped container.
Fig. 11 is an enlarged partial vertical cross-sectional view showing a modification of the connection structure between the main body and the base in the cup-shaped container.
Fig. 12 is a perspective view of a cup-shaped container according to embodiment 2 of the present invention.
Fig. 13 is a vertical sectional view taken along line XIII-XIII of fig. 12, in which a portion surrounded by a one-dot chain line C is an enlarged view of a portion surrounded by a one-dot chain line C, and a portion surrounded by a one-dot chain line D is an enlarged view of a portion surrounded by a one-dot chain line D.
Fig. 14 is a horizontal sectional view taken along line XIV-XIV of fig. 13, in which a portion surrounded by a one-dot chain line E is an enlarged view of the portion surrounded by the one-dot chain line E.
Fig. 15 (a) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material, and (b) is an enlarged cross-sectional view showing the layer structure of the laminate of materials as a base material.
Fig. 16 (a) is a plan view of a body preform, and (b) and (c) are horizontal cross-sectional views sequentially showing steps of molding a body from the body preform.
Description of the reference numerals
1. 1X: cup-shaped container
2: main body
2a: lower end of main body
21: staggered part
21X: palm closing part
22: fold-back part
23: flange part
20A: blank for body
20: laminate body
201: metal foil layer
202: inner heat-fusible resin layer
203: outer heat-fusible resin layer
203X: heat resistant resin layer
3: bottom body
31: bottom part
32: hanging part
32a: smoothing face
30A: blank for base
30: laminate body
301: metal foil layer
302: upper heat-fusible resin layer
303: lower heat-fusible resin layer
T1: thickness of the bottom
T2: thickness of upper portion of the hanging portion
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 16.
In the following description, "up and down" refers to up and down of the cup-shaped container, the main body, and the bottom body (e.g., up and down of fig. 2, 9 to 11, and 13), while "inside" refers to a side of the cup-shaped container, the main body, and the bottom body closer to the center (e.g., upper side of fig. 4, right side of fig. 9 to 11), and "outside" refers to a side of the cup-shaped container, the main body, and the bottom body farther from the center (e.g., lower side of fig. 4, left side of fig. 9 to 11).
Embodiment 1
Fig. 1 and 2 show the overall configuration of a cup-shaped container 1 according to embodiment 1 of the present invention, in which a body 2 molded from a body blank 20A and a base 3 molded from a base blank 30A are joined and integrated together in the container 1.
As shown in fig. 5, the body 2 has a tapered cylindrical structure, and is formed by interlacing and bonding both end edges of a body blank 20A formed in a fan shape. Therefore, the body 2 has the staggered portion 21 extending in the height direction thereof.
A folded portion 22 folded inward is formed at the lower end opening edge portion of the main body 2.
Further, a flange 23 is provided at an upper end opening edge of the main body 2, and is bent outward. The flange 23 is folded back downward and formed into a substantially horizontal flat shape. The flange portion may be formed in a shape of a substantially circular arc in cross section by being curled downward in a manner other than the illustrated one, for example.
The base body 3 has a substantially inverted U-shaped cross-section, and includes a horizontal base 31 formed in a circular shape and a hanging portion 32 extending downward from an outer peripheral edge portion of the base 31, and is formed by drawing a circular base body blank 30A as shown in fig. 6.
The outer surface of the hanging portion 32 of the base 3 is joined to the inner surface of the lower end portion 2a of the main body 2, and the folded portion 22 of the main body 2 is joined to the inner surface of the hanging portion 32, whereby the main body 2 and the base 3 are integrated (see fig. 2 and 10).
As shown in the modification example in fig. 11, the folded portion 22 may not be formed at the lower end opening edge portion of the main body 2, and the main body 2 and the base 3 may be integrated by a coupling structure in which only the outer surface of the hanging portion 32 of the base 3 is joined to the inner surface of the lower end portion 2a of the main body 2.
As shown in fig. 3 (a), the body material 20A is formed of a laminate 20, and the laminate 20 includes: a metal foil layer 201; an inner heat-fusible resin layer 202 laminated on the inner surface of the main body 2 of the two surfaces of the metal foil layer 201; and an outer heat-fusible resin layer 203 laminated on the outer surface of the main body 2, which is one of the two surfaces of the metal foil layer 201, wherein the main body material 20A does not have a paper layer.
As shown in fig. 3 (b), the base material 30A is formed of a laminate 30, and the laminate 30 includes: a metal foil layer 301; an upper heat-fusible resin layer 302 laminated on the upper surface of the base body 3, out of the two surfaces of the metal foil layer 301; and a lower heat-fusible resin layer 303 laminated on the lower surface of the base body 3, which is one of the two surfaces of the metal foil layer 301, wherein the base body blank 30A does not have a paper layer.
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 of the laminated bodies 20 and 30 to the above range, it is possible to reliably avoid problems such as an excessive level difference in the portion of the flange portion 23 of the main body 2 formed by the staggered portion 21, or unstable joining of the lower end portion 2a of the main body 2 and the folded portion 22 to the hanging portion 31 of the base body 3, as in the case of paper cups using laminated bodies having a thickness of about 250 to 400 μm as a material of the blank.
The metal foil layers 201, 301 function as a barrier layer 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, or the like can be used, and aluminum foil is preferably used. In the case of aluminum foil, pure aluminum foil and aluminum alloy foil may be used, and both of soft and hard materials may be used.
As a preferable embodiment of the metal foil layers 201 and 301, a metal foil constituting the metal foil layers 201 and 301 has tensile strength: 60-370 MPa (preferably 70-200 MPa), 0.2% yield strength: 25-370 MPa (preferably 30-200 MPa), thickness: aluminum foil of 40 to 200 μm (preferably 70 to 160 μm). By setting the tensile strength and 0.2% yield strength of the aluminum foil to the above ranges, a sufficient strength required for the container can be obtained without losing the formability. Further, by setting the thickness of the aluminum foil to the above range, sufficient barrier properties and molding processability can be obtained.
Preferably, the aluminum foil contains Si:0.02 to 0.5 percent of Fe:0.05 to 1.7 percent of Cu:0.01 to 0.3 percent of Mn: less than 1.5%, mg:100ppm or less, al: 95% by mass or more. In particular, when the Mg content is 100ppm or less (preferably 10ppm or less), the adhesion between the metal foil layers 201 and 301 and the heat-fusible resin layers 202, 203, 302, and 303 is improved, and thus occurrence of delamination can be effectively suppressed.
Specifically, aluminum foils classified according to JIS H4140, for example, a8000 (a 8079H, A8021H, etc.), a1000 (a 1060H, A1100H, etc.), and a3000 (a 3004H, etc.), can be used.
Further, as the aluminum foil, a hard material (quality: H) which is work-hardened is preferably used. This further improves the rigidity of the laminated bodies 20, 30, and prevents deformation such as sagging in the main body of the container. However, a soft material (quality: O) may be used as the aluminum foil, and in this case, excellent molding processability can be obtained.
The metal foil layers 201 and 301 are subjected to a substrate treatment such as a chemical conversion treatment on both sides, as necessary. Specifically, for example, a surface of a metal foil subjected to degreasing treatment is coated with an aqueous solution of any one of the following 1) to 3), and then dried, and a chemical conversion treatment is performed to form a coating film:
1) Contains phosphoric acid;
chromic acid; and
aqueous solution of a mixture of at least 1 compound selected from the group consisting of metal salts of fluorides and nonmetallic salts of fluorides
2) Contains phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins; and
aqueous solutions of mixtures of at least 1 compound selected from the group consisting of chromic acid and chromium (III) salts
3) Contains phosphoric acid;
at least 1 resin selected from the group consisting of acrylic resins, chitosan derivative resins, and phenolic resins;
At least 1 compound selected from the group consisting of chromic acid and chromium (III) salts; and
an aqueous solution of a mixture of at least 1 compound selected from the group consisting of metal salts of fluorides and nonmetallic salts of fluorides.
The film formed on the surface of the metal foil layer 201, 301 by the chemical conversion treatment preferably has a chromium adhesion amount (per one side) of 0.1mg/m 2 ～50mg/m 2 Particularly preferably 2mg/m 2 ～20mg/m 2 。
The thickness of the metal foil layers 201, 301 is preferably 40 to 200. Mu.m, more preferably 80 to 160. Mu.m. By setting the thickness of the metal foil layers 201 and 301 to the above range, sufficient barrier properties and molding processability can be obtained.
The heat-fusible resin layers 202, 203, 302, 303 constitute the inner and outer surfaces of the container 1, and function to protect the metal foil layers 201, 301 and impart moldability to the laminate 20, 30, and also function as heat-fusible layers when joining the both end edges of the body blank 20A to each other and joining the lower end 2a of the body 2 and the folded-back portion 22 to the hanging portion 32 of the base 3.
The heat-fusible resin layers 202, 203, 302, 303 are composed of, for example, a general-purpose film such as a polypropylene (PP) film or a Polyethylene (PE) film having heat-fusible properties, or a composite film obtained by bonding these films, and particularly, an unstretched polypropylene film (CPP) excellent in heat resistance and drawing moldability is preferable. The heat-fusible resin layers 202, 203, 302, 303 may be formed of a coating layer of maleic acid-modified polyethylene, maleic acid-modified polypropylene, ethylene-vinyl acetate, epoxy resin, shellac resin, or the like, instead of the film.
The thickness of the heat-fusible resin layers 202, 203, 302, 303 is preferably 5 to 80 μm, more preferably 10 to 60 μm. By setting the thicknesses of the heat-fusible resin layers 202, 203, 302, 303 to the above-described ranges, sufficient adhesive strength can be obtained at the joint between the both end edges of the body blank 20A, the lower end 2a of the body 2, and the joint between the folded-back portion 22 and the hanging portion 32 of the base body 3, and the difference in layer of the portion constituted by the staggered portions 21 on the upper surface of the flange portion 23 of the body 2 can be made gentle, so that the sealing property at the time of sealing with the lid material is good.
The metal foil constituting the metal foil layers 201 and 301 and the film constituting the heat-fusible resin layers 202, 203, 302, and 303 are laminated by, for example, a dry lamination method via an adhesive layer (not shown). For example, a two-part curable polyester-polyurethane adhesive or polyether-polyurethane adhesive is used as the adhesive layer.
Due to the presence of the adhesive layer, for example, in the case where the heat-fusible resin layers 202 and 203 at both end edges of the body blank 20A are thinned by heat welding at the staggered portion 21 of the body 2, the metal foil layers 201 are prevented from contacting each other, and thus the sealing property is maintained. In addition, if the adhesive layer is present, even when the container 1 is filled with the content that passes through the heat-fusible resin layers 202, 203, 302, and 303, the metal foil layers 201 and 301 can be prevented from corroding and the content can be prevented from leaking.
The laminate 20 constituting the body material 20A and the laminate 30 constituting the base material 30A are usually the same, but may be different in material and/or thickness.
Next, an example of a method of forming the cup-shaped container 1 using the laminated bodies 20 and 30 will be described.
First, the laminate 20 is punched out into a fan shape of a predetermined size to form a body material 20A (see fig. 5 (a)).
The laminate 30 is punched out into a circular shape of a predetermined size to form a base material 30A (see fig. 6 (a)).
Then, the base material 30A is subjected to drawing forming processing using the forming apparatus 4 shown in fig. 8. The molding device 4 includes an annular die 41 and a binder 42 arranged in a vertically aligned manner, and a punch 43 that moves up and down in the center of the die 41 and the binder 42. The molding process is performed as follows: the blank 30A for a base body, the surface of which is coated with a lubricant as needed, is arranged between the die 41 and the binder 42, and the punch 43 is raised while the outer peripheral portion of the blank 30A for a base body is pressed against the lower surface of the die 41 by the binder 42 with a desired pressure. In this way, the bottom body 3 having a substantially inverted U-shaped cross section formed by the bottom portion 31 and the hanging portion 32 can be molded (see fig. 6 (b)).
Next, the base 3 is placed in advance on a mold (not shown) having a substantially conical trapezoid shape with the upper surface of the bottom 31 overlapping the top surface of the mold, the body material 20A is wound around the outer peripheral surface of the mold, and after the both end edges thereof are staggered, the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203 constituting the overlapping surfaces of the staggered portions 21 are heat-fused to form the tapered tubular body 2. The heat sealing means of the staggered parts 21 may be high-frequency sealing, ultrasonic sealing, or the like, in addition to heat sealing using a hot plate.
Next, as shown in fig. 10, the lower end opening edge portion of the main body 2 is turned back inward, the turned back portion 22 is pressed against the suspended portion 32 of the base 3 by a disk-shaped rotary mold (not shown), and then the inner heat-fusible resin layer 202, which constitutes the surface where the lower end portion 2a of the main body 2 and the turned back portion 22 overlap with the suspended portion 32 of the base 3, and the upper heat-fusible resin layer 302 and the lower heat-fusible resin layer 303 are heat-fused, whereby the main body 2 and the base 3 are joined together.
The flange 23 (see fig. 10) is formed by crimping the upper end opening edge of the main body 2 outward using a predetermined crimping die (not shown) and pressing the upper end opening edge in the up-down direction to form a flat shape.
In this way, the cup-shaped container 1 shown in fig. 1 and 2 was produced.
In the cup-shaped container 1 of the present embodiment, a smooth surface portion 32a continuous over the entire circumference is provided on the outer surface of the hanging portion 32 of the base 3. The smooth surface portion 32a does not have irregularities such as wrinkles associated with molding. The "smooth face" herein refers to a portion where irregularities such as wrinkles are not visible in visual observation. More specifically, for example, in the horizontal cross section of the hanging portion 32, a portion where no irregularities having a height of more than 1mm (preferably 0.5 mm) with respect to an imaginary circle are observed is regarded as a "smooth face portion" on the basis of an imaginary circle including a large part of the outer surface.
The smooth surface portion 32a is most preferably formed on the entire outer surface of the hanging portion 32 as shown in fig. 7 (a), but may be formed at least on a part of the upper portion of the outer surface of the hanging portion 32 as shown in fig. 7 (b).
The radius of curvature (R) of the corner portion between the bottom 31 and the hanging portion 32 in the outer surface of the bottom body 3 is smaller than in the case of paper cups (see fig. 9 and the like).
Referring to fig. 9, in the base 3, the difference (|t1-t2|) between the thickness T1 of the bottom 31 and the thickness T2 of the upper portion of the hanging portion 32 is preferably 20 μm or less, more preferably 10 μm or less. Further, the thickness T2 of the upper portion of the hanging portion 32 is preferably substantially uniform over the entire circumference. It is considered that, according to the above thickness ratio, a gap is less likely to occur between the hanging portion 32 and the lower end portion 2a of the main body 2 and the folded portion 22, and the sealing performance is improved.
The thickness T3 of the lower portion of the hanging portion 32 is preferably greater than the thickness T1 of the bottom portion 31 and the thickness T2 of the upper portion of the hanging portion 32. It is considered that, according to the above thickness ratio, not only the strength of the hanging portion 32 is improved, but also a gap is less likely to occur between the hanging portion 32 and the lower end portion 2a of the main body 2 and the folded portion 22, and the sealability is improved.
The thickness T1 of the bottom 31 and the thickness T2 of the upper portion of the hanging portion 32 are preferably 0.9 to 1.1 times, more preferably 0.95 to 1.0 times, the thickness of the base material 30A before molding. The thickness T3 of the lower portion of the hanging portion 32 is preferably 1.05 to 1.4 times, more preferably 1.15 to 1.30 times, the thickness of the base material 30A before molding. The above thickness ratio can prevent the metal foil layer 301 from becoming thin during the molding of the base material 30A, which may reduce the strength of the base material 3 or cause cracking of the metal foil layer 301 and pinholes. Further, according to the above thickness ratio, since the outer peripheral portion of the base body blank 30A is stretched to a small extent during the drawing forming, it is not easy to form an ear portion at the lower end of the hanging portion 32 of the formed base body 3. Accordingly, the height of the hanging portion 32 becomes substantially the same over the entire circumference or the difference in height is suppressed to be within about 2mm, and therefore, the occurrence of a gap between the hanging portion 32 and the lower end portion 2a of the main body 2 and the folded portion 22 joined thereto can be suppressed, and even if the gap is generated, the sealability of both is not affected.
Referring to fig. 4, in the staggered portion 21 of the main body 2 of the cup-shaped container 1, the total thickness T4 of the inner heat-fusible resin layer 202 and the outer heat-fusible resin layer 203, which are heat-fused to each other at both end edges of the main body preform 20A, is preferably 8 to 150 μm, and more preferably 16 to 80 μm. If the total thickness T4 is less than 8 μm, the sealability of the staggered portions 21 may be insufficient. On the other hand, if the total thickness T4 exceeds 150 μm, the barrier properties of the staggered portions 21 may be impaired.
In the staggered portion 21 of the main body 2, the overlapping width W1 of the metal foil layers 201, 201 at both end edges of the main body blank 20A as viewed in the thickness direction is preferably 2 to 10mm, more preferably 4 to 8mm. If the overlap width W1 is less than 2mm, barrier properties of the staggered portions 21 may be impaired, and sealing width may be too small to provide sufficient sealing properties. On the other hand, if the overlap width W1 exceeds 10mm, the width of the staggered portion 21 becomes excessively large, which leads to an increase in cost, and further, there is a possibility that appearance defects such as wrinkles may occur in the inner portion of the staggered portion 21 due to a difference in stress acting on 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 staggered portion 21.
In addition to the above-described staggered joining of the two end edges of the body material 20A, for example, the two end edges may be overlapped and joined in a palm-like manner, and in this case, the outer heat-fusible resin layer 203 of the body material 20A may be omitted.
The cup-shaped container 1 according to the present embodiment has the following effects.
a) The body material 20A and the base material 30A are formed of the laminate 20, 30, respectively, and the laminate 20, 30 includes the metal foil layers 201, 301 and the heat-fusible resin layers 202, 203, 302, 303 laminated on both surfaces thereof, so that the paper cup can be manufactured at low cost using manufacturing equipment.
b) The laminate 20, 30, which is the material of each of the blanks 20A, 30A, has the metal foil layers 201, 301, and therefore the long-term storage property of the content is excellent.
c) Since the thickness of the body material 20A is smaller than that of the paper cup, the level difference of the portion including the staggered portions 21 on the upper surface of the flange portion 23 of the body 2 can be reduced, and thus, sealing failure is less likely to occur when the lid is sealed on the upper surface of the flange portion 23 of the container 1. In addition, in the case of aseptic filling, the sterilizing liquid is less likely to remain on the upper surface of the flange portion 23 at the level difference.
d) The base body 3 is formed by drawing the base body blank 30A, and a smooth surface portion 32a continuous over the entire circumference is provided on at least an upper portion of the outer surface of the suspended portion 32 of the base body 3, and no irregularities such as wrinkles are generated in the smooth surface portion 32a due to the molding, so that the sealability between the suspended portion 32 of the base body 3 and the lower end portion 2a of the main body 2 and the folded portion 22 is improved, and no leakage of contents and no deterioration in barrier properties are generated.
e) The thicknesses of the body material 20A and the base material 30A are smaller than those of the paper cup, and therefore the lower end portion 2a of the body 2 and the folded portion 22 can be stably joined to the hanging portion 32 of the base 3.
f) Since the radius of curvature (i.e., R) of the corner portion between the bottom portion 31 and the hanging portion 32 of the outer surface of the bottom body 3 can be reduced as compared with paper cups, 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 main body 2 when aseptic filling is performed.
g) The stacked bodies 20, 30, which are the materials of the respective blanks 20A, 30A, have no paper layer, and thus can be subjected to retort sterilization without any trouble.
< embodiment 2 >
Fig. 12 to 16 show a cup-shaped container 1X according to embodiment 2 of the present invention.
The cup-shaped container 1X of the present embodiment is substantially the same as the cup-shaped container 1 of embodiment 1 shown in fig. 1 to 11 except for the following points.
That is, the body 2 of the cup-shaped container 1X is formed by overlapping and joining both end edges of the body blank 20A (see fig. 16 (a)) formed in a fan shape. Therefore, the palm portion 21X extending in the height direction thereof is present in the main body 2. The palm portion 21X is folded to one side so as to overlap with the outer surface of the main body 2, and is joined to the outer surface. The width (overlapping amount) of the palm-engaging portion 21X of the main body 2 is preferably 5 to 20mm, more preferably 10 to 18mm. If the width is less than 5mm, the sealing operation of the palm portion 21X may be difficult. On the other hand, if the width exceeds 20mm, the width of the half-sole portion 21X becomes too large, which increases the cost, and when the half-sole portion 21X is folded to one side so as to overlap the outer surface of the main body 2 and is joined to the outer surface, there is a possibility that appearance defects such as wrinkles may occur in the half-sole portion 21X.
As shown in fig. 15, the body material 20A is formed of a laminate 20, and the laminate 20 includes: a metal foil layer 201; a heat-fusible resin layer 202 laminated on the inner surface of the main body 2 of the two surfaces of the metal foil layer 201; and a heat-resistant resin layer 203X laminated on the outer surface of the metal foil layer 201, which is the main body 2, wherein the main body material 20A does not have a paper layer.
The heat-resistant resin layer 203X forms the outer surface of the main body 2 of the container 1, protects the metal foil layer 201, and plays a role of imparting moldability to the laminate 20.
As the resin constituting the heat-resistant resin layer 203X, a resin having a melting point higher by 10 ℃ or more, preferably 20 ℃ or more than that of the heat-fusible resin constituting the heat-fusible resin layer 202 is used. Preferably, the resin is a thermoplastic resin, and thus the joint between the palm portion 21 formed by bending the main body 2 and the outer surface of the main body 2 can be easily performed by thermal welding.
Specific examples of the heat-resistant resin layer 203X include Polyester (PS) films such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyamide (PA) films, and biaxially oriented polypropylene films (OPP). In particular, when a polyethylene terephthalate (PET) film is used as the heat-resistant resin layer 203X, excellent water resistance can be obtained, and since the film has printability and stability when a printed layer is laminated, it is easy to impart recognition to the surface of the main body 2.
The thickness of the heat-resistant resin layer 203X is preferably 5 to 30. Mu.m, more preferably 8 to 20. Mu.m. When the thickness is set to the above range, the metal foil layer 201 of the body material 20A can be reliably protected by the heat-resistant resin layer 203X, the folded palm portion 21X of the body 2 can be more reliably joined to the outer surface of the body 2 overlapped with the palm portion, and the thickness of the body material 20A can be reduced.
The metal foil constituting the metal foil layer 201 and the film constituting the heat-resistant resin layer 203X are laminated by a dry lamination method via an adhesive layer (not shown) formed of, for example, a two-part curable polyester-polyurethane adhesive or a polyether-polyurethane adhesive.
In manufacturing the cup-shaped container 1X, for example, the body material 20A is wound around the outer peripheral surface of a die (not shown) having the bottom body 3 placed on the top surface, and after the both end edge portions are overlapped with each other in a palm-like shape, the heat-fusible resin layers 202 constituting the overlapped surfaces of the both end edge portions are heat-fused with each other, thereby forming the tapered tubular body 2 (see fig. 16 b).
Here, the heat sealing of both end edges of the body material 20A is usually performed by heat sealing using a hot plate, but may be performed by high-frequency sealing, ultrasonic sealing, or the like. For example, in the case where the heat-fusible resin layer 202 is formed of an unstretched polypropylene film (CPP), it is preferable that the sealing temperature be: 160-220 ℃ and load: 80-200 kgf and sealing time: heat sealing is carried out under the condition of 1 to 5 seconds. In addition, when the heat-fusible resin layer 202 is formed of a polyethylene film (PE), it is preferable that the sealing temperature be: 140-220 ℃ and the load: 80-200 kgf and sealing time: under the condition of 1 to 5 seconds. That is, in the case of heat sealing, it is preferable that the heat sealing is performed from both sides of both end edges of the body material 20A overlapped in a palm-like shape while heating at a temperature 20 to 40 ℃ higher than the melting point of the resin constituting the heat-fusible resin layer 202.
Further, after the palm portion 21X of the main body 2 is folded to one side and overlapped with the outer surface of the main body 2, the both are joined by thermal fusion (see fig. 16 (c)). The heat welding of the palm portion 21X of the main body 2 to the outer surface of the main body 2 is preferably performed by high-frequency sealing. High frequency seals are used, for example, at the output: 0.5-1.5 kW, sealing time: 3-5 seconds, distance from coil: 0.5-15 mm and load: 100 to 200 kgf.
According to the cup-shaped container 1X of embodiment 2, the following effects are provided in addition to the effects of the above-described a) to g) provided by the cup-shaped container 1 of embodiment 1.
h) Since the surface of the palm portion 21X of the body 2 is constituted by the heat-resistant resin layer 203X, surface roughness associated with thermal welding of both end edge portions of the body blank 20A can be effectively suppressed, and the body 2 excellent in appearance can be obtained
i) The palm portion 21X formed by bending the main body 2 and the outer surface of the main body 2 overlapped with each other can be easily joined by heat welding without using an adhesive. Further, the palm portion 21X of the main body 2 is joined to the outer surface of the main body 2, and therefore does not interfere with the holding of the main body 2 by hand or the drinking of the liquid filled in the container 1 from the upper end opening edge portion of the main body 2.
j) The heat-fusible resin layers 202 overlapping the both end edges of the main body material 20A in a palm-like shape are heat-fused to each other, and therefore, for example, a higher bonding strength can be obtained and the sealability of the main body 2 can be improved as compared with a case where the both end edges of the main body material are staggered and bonded.
Although not shown in detail, the heat-resistant resin layer 203X of embodiment 2 may be applied to the cup-shaped container 1 of embodiment 1 having the staggered portion 21 in the body 2 (see fig. 1 to 11) instead of the heat-fusible resin layer 203 on the outer side of the laminate 20 forming the body blank 20A.
In the case of the above embodiment, in the staggered portion 21 of the main body 2, the inner heat-fusible resin layer 202 and the heat-resistant resin layer 203X constituting the mutually overlapping surfaces of the both end edges of the main body preform 20A are heat-sealed by, for example, heat sealing, and the heat-resistant resin layer 203X forms an outer heat-fusible resin layer. Therefore, the heat-resistant resin layer 203X needs to be made of a thermoplastic resin that can be thermally welded to the inner thermally weldable resin layer 202. Specifically, for example, when the inner heat-fusible resin layer 202 is formed of Low Density Polyethylene (LDPE), high Density Polyethylene (HDPE) is used as the heat-resistant resin layer 203X. When the inner heat-fusible resin layer 202 is formed of a polyethylene random copolymer (rPP), a polypropylene homopolymer (hPP) or a polypropylene block copolymer (bPP) is used as the heat-resistant resin layer 203X.
The heat welding of the staggered both end edges of the main body material 20A is usually performed by heat sealing using a hot plate. However, the heat sealing of the above portions may be performed by high-frequency sealing, ultrasonic sealing, or the like. In the case of heat sealing, it is preferable that the sealing temperature: heat-resistant resin layer 203 side=160 to 200 ℃, heat-fusible resin layer 202 side=80 to 120 ℃, load: 80-200 kgf and sealing time: under the condition of 2-5 seconds. That is, the sealing temperature of the heat-resistant resin layer 203X side is preferably set to be 10 to 30 ℃ higher than the melting point of the resin constituting the layer 203. However, if the sealing temperature is too high, the surface roughness of the surface of the body material 20A becomes serious, and there is a possibility that the appearance may be poor. On the other hand, if the sealing temperature on the side of the heat-fusible resin layer 202 is set to a temperature near the melting point of the resin constituting the heat-fusible resin layer 202, the main body 2 may not be released from the mold, and therefore, it is preferable to set to a temperature 20 to 40 ℃ lower than the melting point.
Examples
Next, specific examples of the present invention will be described, but the present invention is not limited to these examples.
Example 1 >
The two surfaces of the aluminum foil (A8021H-O) with the thickness of 100 μm, which were subjected to the chemical conversion treatment, were coated with about 3g/m 2 Two-part curable polyurethane adhesive of (2) and dry-laminating an unstretched polypropylene film (CPP) having a thickness of 30 μm. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate.
Next, the obtained laminate is punched out into a predetermined shape, and a body material and a base material are formed (see fig. 5 and 6).
Then, a cup-shaped container was produced by the same procedure as in embodiment 1 using the body material and the base material, and this was used as example 1. The main body and the base are joined in the manner shown in fig. 11. The cup-shaped container uses aluminum foil having a thickness of 100 μm, and is therefore a container having excellent barrier properties, which is substantially impermeable to oxygen and water vapor.
The dimensions of the cup-shaped container were as follows.
(size of cup-shaped Container)
Inner diameter of the opening in the upper part of the cup-shaped container: 65mm of
Inner diameter of the lower part of the cup-shaped container: 50mm
Width of flange portion: 4mm of
Height of cup-shaped container: 95mm of
Height of the foot (drop (32)) of the cup-shaped container: 6mm of
Width of the staggered portion of the main body (overlap amount): 8mm of
In addition, in the manufacturing process of the cup-shaped container, the thickness of each portion of the base body obtained by molding the base body blank (thickness 160 μm) by the molding device was measured using a micrometer, the thickness T1 of the base portion was 160 μm, the thickness T2 of the upper portion of the hanging portion was 162 μm, and the thickness T3 of the lower portion of the hanging portion was 185 μm (see fig. 9).
When the outer surface of the hanging portion of the base body is visually observed, generation of irregularities such as wrinkles accompanying molding is not observed, and the base body is smooth over the entire range.
< test of tightness >)
10 cup-shaped containers of example 1 were prepared, and after being left for 120 minutes with 50cc of water added, the containers were visually checked for leakage of water from the seal portion between the lower end portion of the main body and the hanging portion of the base, and no water leakage was observed in each container.
Example 2 >
Coating one surface of an aluminum foil (A8021H-O) having a thickness of 100 μm, which was subjected to a chemical conversion treatment on both surfaces, with about 3g/m 2 Two-part curable polyurethane adhesive of (a) and dry-laminated an unstretched polypropylene film (CPP) having a thickness of 30 μm (=heat-fusible resin layer). In addition, anotherIn addition, the other surface of the aluminum foil is coated with about 3g/m 2 A polyethylene terephthalate (PET) film (=heat-resistant resin layer) having a thickness of 12 μm was dry-laminated. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate. Next, the obtained laminate is punched out into a predetermined shape, and a body material is formed (see fig. 16).
Further, about 3g/m of each of the two surfaces of an aluminum foil (A8021H-O) having a thickness of 100 μm, which had been subjected to the chemical conversion treatment, was coated with 2 Two-part curable polyurethane adhesive of (2) and dry-laminating a non-stretched polypropylene resin film (CPP) having a thickness of 60 μm. Then, a predetermined aging treatment is performed to cure the adhesive, thereby producing a laminate. Next, the obtained laminate is punched out into a predetermined shape, and a base material blank is formed (see fig. 6).
Next, a cup-shaped container shown in fig. 12 and 13 was produced by the same process as in embodiment 2 using a body blank and a base blank, and example 2 was obtained.
Here, the joining of the two end edges of the body material, which overlap in a palm-like shape, to each other is at a sealing temperature: 200 ℃ and load: 150kgf, sealing time: this is done by heat sealing for 3 seconds. In addition, the joint of the folded palm portion and the surface of the main body is output: 1.5kW, sealing time: 3 seconds, distance from coil: 5mm, load: and is carried out by high-frequency sealing under the condition of 150 kgf.
The cup-shaped container thus obtained was excellent in barrier properties against permeation of oxygen and water vapor, because of using an aluminum foil having a thickness of 100. Mu.m.
The cup-shaped container was the same size as in example 1.
Inner diameter of the opening in the upper part of the cup-shaped container: 65mm of
Inner diameter of the lower part of the cup-shaped container: 50mm
Width of flange portion: 4mm of
Height of cup-shaped container: 95mm of
Height of the foot (return portion 22) of the cup-shaped container: 6mm of
Width (overlap amount) of the palm-combining portion of the main body: 15mm of
< inspection of surface State of body portion >
The cup-shaped container of example 2 was visually observed for the surface state of the main body, and as a result, no surface roughness associated with heat sealing of the palm portion was observed, and a good appearance was exhibited.
Industrial applicability
The present invention can be preferably used as a cup-shaped container containing, for example, a flowable food, a beverage, or the like, and a method for producing the same.

Claims (9)

1. A cup-shaped container, comprising:
a main body formed by overlapping and joining both end edges of a main body blank to each other to form a tubular shape; and
a bottom body with a substantially inverted U-shaped cross section, which is formed by forming a blank for the bottom body into a bottom and a hanging part extending downwards from the outer periphery of the bottom,
in which a main body and a base body are integrated by engaging an inner surface of a lower end portion of the main body with an outer surface of a hanging portion of the base body, characterized in that,
The body blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the inner side of the body of the metal foil layer, both end edge portions of the body blank are joined by heat-welding the heat-fusible resin layers constituting the overlapping surfaces of the both end edge portions to each other,
the base blank is formed of a laminate comprising a metal foil layer and a heat-fusible resin layer laminated on at least the upper side of the base of the two sides of the metal foil layer, the inner surface of the lower end portion of the main body and the outer surface of the hanging portion of the base are joined by heat-fusing the heat-fusible resin layers constituting these sides to each other,
in the cup-shaped container, at least an upper part of the outer surface of the hanging part of the bottom body is provided with a smooth face part which is continuous in the whole circumference,
the thickness of the lower part of the hanging part is 1.05-1.4 times of the thickness of the blank for the bottom body before molding.
2. The cup-shaped container according to claim 1, wherein a difference between a thickness of the bottom portion in the bottom body and a thickness of the upper side portion of the hanging portion is 5 μm or less.
3. The cup-shaped container according to claim 2, wherein the thickness of the bottom portion of the base and the thickness of the upper portion of the hanging portion are each 0.9 to 1.1 times the thickness of the base blank before molding.
4. The cup-shaped container according to claim 1, wherein the main body further comprises a folding portion which is folded inward from a lower end opening edge portion of the main body so as to wrap a hanging portion of the bottom body therein and extends upward,
the folded portion of the main body and the hanging portion of the bottom body are joined by heat-welding heat-weldable resin layers constituting mutually overlapping surfaces thereof.
5. The cup-shaped container according to claim 1, wherein the laminate forming the body blank has a heat-resistant resin layer laminated on a surface of the metal foil layer which is the outer side of the body, and the heat-resistant resin layer contains a resin having a melting point higher than a melting point of a resin constituting the heat-fusible resin layer laminated on a surface of the metal foil layer which is the inner side of the body by 10 ℃ or more.
6. The cup-shaped container according to claim 5, wherein both end edge portions of the body blank overlap in a palm-like shape and are joined by heat-welding heat-weldable resin layers constituting mutually overlapping surfaces of the both end edge portions to each other.
7. The cup-shaped container according to claim 6, wherein the heat-resistant resin layer comprises a thermoplastic resin,
The palm-closing portion of the main body is folded to one side so as to overlap with the outer surface of the main body, and is heat-welded to the outer surface.
8. The cup-shaped container according to claim 5, wherein the thickness of the heat-resistant resin layer is 5 to 30 μm.
9. A method for manufacturing a cup-shaped container according to claim 7, characterized in that,
the palm-closing portion of the main body is folded to one side so as to overlap with the outer surface of the main body, and is thermally welded to the outer surface by high-frequency sealing.
CN202011489797.8A 2019-12-16 2020-12-15 Cup-shaped container and method for manufacturing same Active CN112978003B (en)

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US5178280A (en) * 1988-10-05 1993-01-12 Ab Profer Distribution unit of packages
CN101108668A (en) * 2006-07-17 2008-01-23 Ptm包装工具机器私人有限公司 Beaker made from a paper material
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