Sealing structure for container and cap used for the same

Abstract

A seal member (13) is heat sealed on the upper surface of a container opening (12), and a cap (15) is installed on the container opening (12). The cap (15) has a top plate (15a) covering the container opening (12) and also has, on the inner surface of the top plate (15a), an inner periphery projection (15e) located in the vicinity of a position more on the inner side than the inner peripheral edge of the container opening (12). The construction facilitates separation (separation for opening) of the seal member (13) with high sealing ability maintained, and prevents separation of the seal member (13) at the inner peripheral edge of the container opening (12) caused by a rise in pressure in the container.

Description

technical field [0001] The present invention relates to a container sealing structure capable of ensuring high airtightness by sealing the mouth of a container with a sealing member and attaching a lid, and easy to unseal and peel off the sealing member, and a lid used in the sealing structure. Background technique [0002] For example, in Patent Document 1, it is disclosed that an inner cover made of a plastic thin plate is bonded and sealed to the opening of the container body with peelable adhesive strength, the outer cover is covered on the inner cover, and screwed on the container body to form Plastic containers for distillation. According to the plastic container for retort disclosed in Patent Document 1, the inner lid of the airtight container is not peeled off during retort sterilization, and the inner lid can be easily peeled off when unsealing. [0003] In addition, in Patent Document 2, it is disclosed that by thermally welding a sealing member on the top surface...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that it is difficult to cleanly peel off the sealing material from the mouth when the sealing material is opened and peeled even if the peeling tab remains.

In addition, since the sealing material is tightly bonded to the dome-shaped protrusion, there is also a problem that the increase in internal pressure cannot be absorbed because there is no place for pressure relief when the internal pressure of the container increases during high-temperature sterilization or when the impact is dropped.

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