JPH09286446A - Plastic cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten airtightness as high as possible in a plastic cap by forming a cap body except, a roof face out of plastic and closing the roof face with a metal plate. SOLUTION: In a plastic cap 2 of a container body 1, an opened roof face 4 of a cap body 3 is closed by a metal plate 5. A fitting section 7 formed on an inner face of a side face 6 is fitted in a fitting section 9 formed on an upper outer peripheral face 8 of the container body 1 so as to mount on the upper part of the container body 1. The metal plate 5 for the cap body 3 can be integrally incorporated at molding. Further, at the middle part of the side face 6 of the cap body 3, a security band 10 is integrally molded. By cutting and turning the band 10, the roof face 4 of the cap 2 can be opened. Also, the metal plate 5 can be stuck together to the top face or the bottom face of the roof face 4 which is integrally closed by the plastic or may be molded into the thickness of the roof face 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cap which is as airtight as possible.

[0002]

2. Description of the Related Art In the case of articles requiring airtightness such as coffee, nuts, tea, and chemicals, a metal can, a glass bottle, a container laminated with an aluminum film, or a container formed of a highly airtight plastic. Etc. are used, and the cap is usually made of metal or a cap made of highly airtight plastic in many cases.

[0003]

Therefore, there are the following problems. a. In the case of a metal cap, it is usually a screw opening / closing method, and it is not possible to adopt a one-touch opening / closing method having a hinge mechanism in terms of material and processing technology, or a structure with a retractable security band. Therefore, the application is limited and it is inconvenient to use.

B. The conventional plastic cap has the characteristic that it can be integrally molded including the hinge and the security band, but on the other hand, since a soft material such as polyethylene is generally used, it is airtight or chemical resistant. Has a limit and is weak in strength.

[0005]

SUMMARY OF THE INVENTION The present invention has an object to increase the airtightness of a cap made of a relatively soft plastic. The means for solving this problem are as follows. is there.

1. A plastic cap formed by molding the cap body excluding the top surface with plastic and closing the top surface with a metal plate.

[0007] 2. A plastic cap made by laminating a metal plate on the top surface, the inner surface, or the thickness of the top surface of the cap body molded from plastic.

[0008] 3. A security band is integrally molded in the middle of the side surface of the cap body, and the top surface side can be opened by cutting and turning this security band, and a hinge is provided between the cut top surface side and the side surface. 3. The plastic cap as described in 1 or 2 above, which is integrally connected.

[0009]

Since the top surface of the cap is covered with the metal plate, the airtightness is completely maintained on the top surface occupied by the metal plate. Therefore, in a cap with a large diameter, the area occupied by the top surface also increases,
It is particularly effective for maintaining airtightness.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 shows an overall view of a metal can equipped with a cap according to the present invention. Reference numeral 1 is a metal container main body, 2 is a plastic cap, and this cap 2 has a structure in which an open top surface 4 of the cap main body 3 is closed by a metal plate 5, as shown in FIG. The fitting portion 7 formed on the inner surface of the side surface 6 is fitted to the fitting portion 9 formed on the upper outer peripheral surface 8 of the metal can body 1 to be mounted on the upper portion of the container body 1. The metal plate 5 with respect to the cap body 3 can be integrally incorporated during molding.

Reference numeral 10 denotes a security band integrally formed in the middle of the side surface 6 of the cap body 3. By turning around this band 10, the top surface 4 side of the cap 2 can be opened. Reference numeral 11 is a hinge connecting the upper portion of the side surface 6 remaining after the security band 10 is cut off and the top surface 4 side, 12 is an open claw, and 13 is a sealing material attached to the inner surface of the metal plate 5 in a ring shape.

FIG. 3 is an explanatory view of the cap body 3, the metal plate 5, and the sealing material 13 portion. FIG. 4 shows that the top surface 4 of the cap body 3 is integrally closed with plastic,
An embodiment in which the metal plate 5 is attached to the upper surface of the top surface 4, FIG. 5 is an embodiment in which the metal plate 5 is attached to the lower surface of the top surface 4, and FIG. It is explanatory drawing of the Example which molded. In addition, in FIGS.
Are bonded to the top surface 4 with an adhesive.

[0013]

The present invention is constituted as described above and has the following effects. a. By disposing the metal plate on the top surface of the cap, the airtightness of the plastic cap can be increased as much as possible. In particular, the airtight effect is remarkable in the cap having a large top surface area.

B. By arranging a metal plate on the top surface to improve airtightness, hinge caps, caps with security bands, etc. molded from soft plastic can be applied to highly airtight containers.

C. By arranging the metal plate on the top,
The strength of the cap is improved. d. By disposing the metal plate on the inner surface of the cap, chemical resistance such as chemical resistance is improved in relation to the object placed in the container.

[Brief description of drawings]

FIG. 1 is a perspective view of a metal can equipped with a cap according to the present invention.

FIG. 2 is an explanatory view in which only an upper portion of a metal can equipped with a cap according to the present invention is sectioned.

FIG. 3 is an explanatory view of a structural example of a cap body, a metal plate, and a sealing material.

FIG. 4 is an explanatory diagram of a cap in which a metal plate is attached to the top surface.

FIG. 5 is an explanatory view of a cap in which a metal plate is attached to the inner surface of the top surface.

FIG. 6 is an explanatory diagram of a cap in which a metal plate is immolded within the thickness of the top surface.

[Explanation of symbols]

 1 Container body 2 Cap 3 Cap body 4 Top surface 5 Metal plate 6 Side surface 7 Fitting part 8 Outer peripheral surface 9 Fitting part 10 Security band 11 Hinge 12 Open claw 13 Sealing material

Claims (3)

[Claims] 1. A plastic cap formed by molding a cap body excluding the top surface with plastic and closing the top surface with a metal plate. 2. A plastic cap formed by laminating a metal plate on the upper surface, the inner surface, or the thickness of the top surface of the cap main body made of plastic. 3. A security band is integrally formed in the middle of the side surface of the cap body, and the top surface side is openable by pulling and cutting the security band, and the cut top surface side and the side surface. The plastic cap according to claim 1 or 2, wherein the spaces are integrally connected by a hinge.