Plastic cap
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United States of America Patent
Stats
-
Nov 20, 1990
Grant Date -
N/A
app pub date -
Dec 21, 1988
filing date -
Apr 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a plastic cap comprising a top plate and a skirt hanging down from the peripheral edge of the top plate, which are integrally formed of a plastic material, and a mechanism for clamping the cap to a vessel, which is arranged on the inner circumferential face of the skirt, wherein a receiving seat to be substantially exactly engaged with the top edge or peripheral edge of the vessel mouth and at least one sealing projection protruding from the receiving seat through a groove by a very small distance from the face of the receiving seat are arranged in an inner corner portion between the top plate and the skirt or in the vicinity thereof, and sealing is effected by the pressure generated by compression deformation of the sealing projection. In this plastic cap, plastic deformation of the sealed portion is prevented and a high durable sealing pressure is obtained. Accordingly, this plastic cap has an excellent pressure-resistant sealing property and an excellent venting property in combination.
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