JPH089001Y2 - Barrier cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sealing cap used for a container for storing and storing medicines, foods and the like.

<Prior art> Conventionally, as a cap of this type, for example, in the case of a container for storing medicine tablets, the container main body is made of glass and a screw-type metal cap is provided with a rubber lining on the inside of the top plate. Is used.

As a characteristic, since it is a combination of a glass container and a metal lid, it has a strong tightening force when closing and requires a large turning force when opening the lid, and there is a problem that it is difficult for women and elderly people to remove the cap. is there.

In order to solve such problems of metal caps, plastic caps have recently been used for glass bottles. This is because the plastic cap top plate is provided with a packing agent such as foamed polyethylene and the like. The close contact with the mouth maintains the hermeticity.

However, in the case of the above plastic cap, there is a problem that the barrier property is inferior to that of the metal cap because the top surface is only plastic.

<Problems to be Solved by the Invention> The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a cap that is made of plastic and has excellent sealing property and barrier property. And

<Means for Solving the Problem> The present invention was devised to solve the above-mentioned problems, in which a central portion inside the top plate of the plastic cap is projected downward to form a step portion at the peripheral edge, A gas barrier layer formed in a shape corresponding to the shape of the inside of the top plate, the gas barrier layer comprising a laminate including a metal oxide vapor-deposited film, is integrated with the bottom surface of the top plate, and is a bottom surface of the gas barrier layer. The barrier cap is characterized in that a packing material is integrated with the peripheral portion of the cap top plate.

<Operation> According to the present invention, the gas barrier layer improves the storability of the contents, and the central portion of the inner side of the top plate of the cap is projected downward to form a stepped portion at the peripheral portion. Since the packing material is integrated on the lower surface, the sealing property is improved. In addition to having a barrier property comparable to that of a metal cap, a laminate including a metal oxide vapor deposition film as a barrier layer is a very thin layer,
Since it does not react to the electromagnetic waves of a metal detector or a microwave oven, it is possible to perform a foreign substance contamination inspection into the container using the metal detector, and it is possible to use it as a cap of a microwave oven container. .

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 shows a first embodiment of the present invention.
Inside the top plate (2) of the cap (1) made of thermoplastic resin such as polyethylene or polypropylene, polypropylene film 20μ / aluminum foil 30μ / polypropylene film 20μ or polypropylene film 20μ / aluminum foil 30μ / ethylene-vinyl acetate A gas barrier film (3) having a gas barrier property and a thermal adhesive property having a layer structure of 20 μm, which is a film obtained by mixing polyethylene in a polymer, is integrally provided.

In this case, as shown in FIG. 1, the inside of the top plate (2) of the cap (1) is made thicker in the vicinity of the center than in the periphery, and a step (4) is formed in the periphery, A top plate of the cap (1) is formed by drawing and molding a gas barrier film (3) according to the shape of the inside of the top plate (2) of the cap (1) by high-frequency adhesion, adhesive, or hot-melt adhesive. It is attached inside (2). Alternatively, the gas barrier film (3) may be set in a cap molding die and integrated with the cap injection molding at the same time.

Then, a packing agent (6) such as vinylidene chloride resin, foamed vinyl chloride resin, or rubber is embedded in the recess (5) formed by the step (4) by coating.

As the gas barrier film (3), a laminate containing a vinylidene chloride film, a nylon film, an ethylene-vinyl acetate copolymer film, a polycarbonate film, a metal or metal oxide vapor deposition film is used in addition to the above-mentioned examples. May be.

<Effect of the Invention> Since the present invention is configured as described above, it has an advantage that it is a plastic cap and has excellent gas barrier properties, excellent adhesion to glass bottles, and easy opening.

[Brief description of drawings]

 FIG. 1 is a sectional view showing a first embodiment of the present invention. (1) ... Cap, (2) ... Top plate (3) ... Gas barrier film (4) ... Step, (5) ... Recess (6) ... Packing agent

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A metal cap is formed by vapor-depositing a metal cap having a central portion on the inner side of a top plate protruding downward to form a step on the peripheral edge and having a shape corresponding to the inner side of the top plate. A gas barrier layer consisting of a laminate containing a film,
A barrier cap integrated with the lower surface of the top plate and having a packing agent integrated with the lower surface of the gas barrier layer at the peripheral edge of the cap top plate.