Easily openable container lid with resealability and method of producing the same

Abstract

An easily unsealable container closure having re-sealing performance and comprising a closure member having an opening portion that has been formed in advance, and an unsealing tab which is so fitted to the outer surface side of the closure member as to cover the opening portion and is hermetically adhered to the periphery of the opening portion, wherein the unsealing tab includes a flexible tab member and a plug member integrally adhered to the tab member and is so formed as to be fitted to the opening portion of the closure member, and the flexible tab member is hermetically fixed to the periphery of the opening portion in the closure member so as to be torn off. The container closure offers re-sealing performance which can be repetitively effected to temporarily seal again the once unsealed opening, and further offers excellent re-sealing performance, unseal indication function and easy-to-unseal performance.

Description

TECHNICAL FIELD [0001] The present invention relates to an easily unsealable container closure and a method of producing the same. More particularly, the invention relates to an easily unsealable container closure which is a partially unsealable container closure having re-sealing performance enabling the opening to be temporarily sealed again such as enabling the opening that is once unsealed to be temporarily sealed again and to a method of producing the same. BACKGROUND ART [0002] Easily unsealable container closures (easy-open lids) have been widely used as food container closures such as of food cans and beverage cans, and can be classified into the container closures of the partially opening type which are chiefly used as closures for beverage cans for containing various kinds of beverages such as coke, beer, juices, etc. and the container closures of the fully opening type which are chiefly used as closures for canned foods and cans containing instant noodles, snack cookies, ...

AI Technical Summary

Benefits of technology

[0012] Besides, to safely and reliably re-seal the container closure without substantially permitting the contents to be leaked, it is particularly important to accomplish the sealing of the opening to some extent, still enabling the closure that has not been unsealed yet to be easily distinguished from the closure that was once unsealed and sealed again to guarantee that the content in the container has not been exchanged unnoticed from the standpoint of preventing mischievous prank and crime.

[0043] According to the present invention, there is further provided a method of producing an easily unsealable container closure comprising the steps of treating an edge of an opening of a closure member having the opening portion that has been formed in advance, forming a flexible tab member and a plug member, and placing the flexible tab member and the plug member on the outer surface of the closure member such that the plug member is fitted to the opening of the closure member and the flexible tab member covers the plug member, enabling the flexible tab member and the plug member to be integrally adhered together thereby to form an unsealing tab and, at the same time, adhering the flexible tab member to the outer surface of the closure member.

Problems solved by technology

However, it is a widely accepted common sense that the easily unsealable containers are discarded after they are used only once and, hence, the closure is unsealed only once.

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