JP-7856387-B2 - Cup-shaped container

JP7856387B2JP 7856387 B2JP7856387 B2JP 7856387B2JP-7856387-B2

Inventors

苗村正

Assignees

株式会社ＤＮＰ高機能マテリアル彦根

Dates

Publication Date: 20260511
Application Date: 20201215
Priority Date: 20191217

Claims (4)

A cup-shaped container comprising a body formed into a cylindrical shape by overlapping and joining the edges of both ends of a blank for the body, and having a flange portion bent outward at the upper opening edge, and a bottom body formed by shaping a blank for the bottom so that a bottom portion and a hanging portion extending downward from the outer peripheral edge of the bottom portion are formed, wherein the body and the bottom body are integrated by joining the outer surface of the hanging portion of the bottom body to the inner surface of the lower end of the body, The fuselage blank is formed from a laminate consisting of a metal foil layer and heat-sealable resin layers laminated on both sides of the metal foil layer, and does not have a paper layer. The edges of both ends of the fuselage blank are joined by heat-sealing the heat-sealable resin layers that make up these overlapping surfaces. The blank for the base is formed from a laminate consisting of a metal foil layer and a heat-sealable resin layer laminated on at least one of the surfaces of the metal foil layer that is on the upper side of the base, and the inner surface of the lower end of the body and the outer surface of the hanging part of the base are joined by heat-sealing the heat-sealable resin layers that make up these surfaces. The flange portion has an upper surface portion extending radially outward from the upper end opening edge of the body, a lower surface portion folded downward from the tip of the upper surface portion and extending radially inward, and an intermediate intervening portion folded upward from the tip of the lower surface portion and extending radially outward between the upper surface portion and the lower surface portion, and is formed in a flattened shape. A cup-shaped container in which the upper, lower, and intermediate flange portions are joined by heat-sealing the heat-sealable resin layers of the body blanks that make up these overlapping surfaces .
A cup-shaped container according to claim 1 , wherein the radial length of the intermediate intervening portion of the flange is 0.5 to 1 times the radial length of the lower surface portion.
A cup-shaped container according to claim 1 or 2 , wherein the intermediate intervening portion of the flange is formed such that, when viewed from a planar perspective, all or part of it overlaps with the sealing area with the lid material on the upper surface of the flange.
A cup-shaped container according to any one of claims 1 to 3, wherein the blank for the body has an inner heat-sealable resin layer laminated on the inner side of the metal foil layer, and an outer heat-sealable resin layer laminated on the outer side of the metal foil layer, the thickness of the inner heat-sealable resin layer is 30 to 120 μm, and the thickness of the outer heat-sealable resin layer is 20 to 100 μm.

Description

This invention relates to a cup-shaped container that contains food or beverages such as ice cream or yogurt. For example, paper cups are commonly used as containers for filling and packaging semi-solid dairy products such as ice cream and yogurt. Paper cups are typically formed by joining together a body and a base, each made from a paper blank cut to a predetermined shape. More specifically, the body is formed into a cylindrical shape by overlapping and joining the edges of both ends of a roughly fan-shaped body blank, with an inwardly folded portion formed at the lower opening edge and an outwardly curled flange portion formed at the upper opening edge. The base has a roughly inverted U-shape in cross-section, formed by skirting a roughly circular base blank so that a hanging portion is formed on its outer circumference. The hanging portion of the base is then wrapped around the folded portion of the body and joined together, thereby integrating the body and the base. Each blank for the fuselage and base consists of a laminate comprising a paper layer made of, for example, general base paper, acid-resistant paper, coated paper, etc., and a polyethylene resin (PE) layer laminated on one or both sides of the paper layer (see, for example, Patent Document 1 below). Furthermore, paper cups are also known that use a laminated structure in which a barrier layer made of aluminum foil or the like is laminated in addition to the paper layer and polyethylene resin (PE) layer as the materials for each of the above-mentioned blanks (see, for example, Patent Document 2 below). In addition, containers made from plastic molded articles such as polypropylene resin (PP) are also known for use with ice cream, yogurt, etc. (see, for example, Patent Document 3 below). Japanese Unexamined Patent Publication No. 58-30955Japanese Patent Publication No. 2007-210639Japanese Patent Publication No. 2007-176505 This is a perspective view of a cup-shaped container according to an embodiment of the present invention.Figure 1 is a vertical cross-sectional view along line II-II, where the area enclosed by dashed line A is an enlarged view of the area enclosed by dashed line a, and the area enclosed by dashed line B is an enlarged view of the area enclosed by dashed line b.(a) is an enlarged cross-sectional view showing the layered structure of the laminated material used for the fuselage blank, and (b) is an enlarged cross-sectional view showing the layered structure of the laminated material used for the bottom blank.This is a horizontal cross-sectional view showing an enlarged view of the overlapping portion of the body of the cup-shaped container described above.This is a vertical cross-sectional view showing an enlarged view of the flange portion of the body of the cup-shaped container described above.(a) is a plan view of the fuselage blank, and (b) is a perspective view of the fuselage formed from the fuselage blank.(a) is a plan view of the base blank, and (b) is a perspective view of the base formed from the base blank.This is a vertical cross-sectional view sequentially showing the molding process of the flange portion of the body of the cup-shaped container described above.This is a vertical cross-sectional view showing part of the manufacturing process for the cup-shaped container described above.This is a vertical cross-sectional view corresponding to Figure 5, showing the main part of the cup-shaped container of Example 2.This is a vertical cross-sectional view corresponding to Figure 5, showing the main part of the cup-shaped container of Comparative Example 1. Hereinafter, embodiments of this invention will be described with reference to Figures 1 to 11. In the following explanation, "top and bottom" refers to the top and bottom of the cup-shaped container, body, or base (for example, the top and bottom of Figures 2, 5, 8-11), "inside" refers to the side of the cup-shaped container, body, or base closer to the center (for example, the top of Figure 4, and the right side of Figures 5, 8-11), and "outside" refers to the side of the cup-shaped container, body, or base further from the center (for example, the bottom of Figure 4, and the left side of Figures 5, 8-11). Figures 1 and 2 show the overall structure of a cup-shaped container (1) according to an embodiment of the present invention, the container (1) is formed by joining together a body (2) molded from a body blank (20A) and a bottom (3) molded from a bottom blank (30A). The body (2) is tapered and cylindrical, and as shown in Figure 6, it is formed by overlapping and joining the edges of both ends of a fan-shaped body blank (20A). Therefore, the body (2) has an overlapping portion (21) that extends along its height. Preferably, the upper corners of the edges of the body blank (20A) that are on the outside of the body (2) are rounded (20c) portions that are cut in an arc shape. This makes it possible to reduce the thickness of the upper end portion of the overlappin