Bottles and jars – Neck – Structure to receive a particular closure
Patent
1997-05-14
1999-01-19
Cronin, Stephen K.
Bottles and jars
Neck
Structure to receive a particular closure
215252, B65D 4902
Patent
active
058605428
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to sealing devices comprising containers and synthetic resin caps having tamper-evidence capabilities for sealing the mouth portions of these containers.
In recent years, synthetic resin containers composed of polyethylene terephthalate (PET bottles) have come into common use as beverage containers. Synthetic resin containers have the advantageous properties of being light and shatterproof in comparison to conventional glass bottles.
Additionally, as caps for this type of synthetic resin, metallic caps of aluminum alloy or the like have been conventionally used. The use of synthetic resin caps is also being advanced to replace these types of metallic caps.
With regard to these types of synthetic resin caps, those disclosed in Japanese Patent Application, First Publication No. Sho 62-251352 and Japanese Patent Application, First Publication No. Hei 2-296666 are known.
These conventional synthetic resin caps are screwed onto containers having an external thread formed on the mouth portions and annular expanded portions below the external thread; the caps are composed of a synthetic resin cap main body formed by a top plate portion and a tubular portion which extends downward from the peripheral portions thereof, and a thin liner provided on the inner surface of the top plate portion of the cap main body, the cap main body being such that the bottom portion thereof is separated, by means of a horizontal score formed around the circumference while leaving a plurality of thin bridges, into a main portion above and a tamper-evidence ring portion below the horizontal score. A threaded portion for screwing onto the external thread on the container mouth portion is formed on the inner wall surface of the main portion of the cap main body, and multiple wings or tabs are provided so as to be capable of being uplifted on the inner wall surface of the tamper-evidence ring portion.
Additionally, as the containers, those having an external thread formed on the outer circumference of the top end portion of the mouth portion and provided with an annular expanded portion (locking ring) below the external thread are used.
With these types of caps having tamper-evidence capabilities, the relationship between the rotational angle (the seal release angle, hereinafter abbreviated to SRA) at the moment the seal of the container is released due to the top end of the container mouth portion being separated from the inner surface of the cap or the liner when the cap attached to the container mouth portion is rotated from the initial position in the direction of opening, and the rotational angle (the bridge breaking angle, hereinafter abbreviated to BBA) at the position where the bridges are broken when the cap attached to the container mouth portion is rotated from the initial position in the direction of opening is held to preferably be such that SRA --BBA=0 degrees or greater, more preferably +30 degrees or greater.
However, with the above-mentioned synthetic resin caps, there are cases wherein the bridges formed from synthetic resin expand and the engaging projections (wings or tabs) are so soft as to bend when engaging with the annular expanded portion, as a result of which the BBA can increase and SRA-BBA can become less than 0 degrees; thus, there are points requiring improvement from the point of view of tamper-evidence capabilities.
As sealing devices designed to increase the above-described tamper evidence capabilities using synthetic resin caps, those described in Japanese Patent Application, Second Publication No. Hei 3-56990 are known. These sealing devices comprise engaging claws having engaging side edges extending downward with a tilt in the cap-opening direction underneath the external thread of the container, and engaged claws which cooperate with the above-mentioned container engaging claws formed on the inner walls of the tamper-evidence ring portion of the cap. With the sealing device of Japanese Patent Application, Second Publication No. Hei 3-56990, whe
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Cronin Stephen K.
Shibazaki Seisakusho Ltd.
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