Bottles and jars – Closures – Cap type
Patent
1984-09-14
1985-11-12
Norton, Donald F.
Bottles and jars
Closures
Cap type
215346, B65D 4122
Patent
active
045522790
ABSTRACT:
A container closure adapted to be applied to a container having threads by an axial movement and to be removed by a rotary movement to open the container comprising a body including a base wall and a peripheral wall and a gasket of plastic material formed in situ along the peripheral wall and at least a portion of the base wall which is adapted to overlie the end of the container. The surface of an annular portion of the gasket along the peripheral wall is formed with a plurality of circumferentially extending substantially flat surfaces such that it has a polygonal configuration in transverse cross section with axially extending channels at the junctures of the substantially flat surfaces. When the closure is applied to the container, the threads on the container deform the surfaces of the polygonal portion by indentation to define complementary threads therein. When the closure is being applied, the channels permit gases in the head space of the container to escape so that excessive pressurization tending to force the cap off does not occur. After the closure is applied to the container, the channels provide areas into which the plastic material may cold flow to release excessive compressive stresses which develop during shelf life of the package comprising the closure and container, thereby resulting in lower removal torques.
REFERENCES:
patent: 3371813 (1968-03-01), Owen et al.
patent: 3690497 (1972-09-01), Lecinski
patent: 4452365 (1984-06-01), Ascasibar-Verdejo
Mueller Bruce M.
Swierczek Zbignew
Nelson John R.
Norton Donald F.
Owens--Illinois, Inc.
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