Method of making plastic beverage closure

Plastic and nonmetallic article shaping or treating: processes – Combined

Patent

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Details

215341, 264250, 264268, 264320, 425809, B29C 4332, B65D 5306

Patent

active

056501137

ABSTRACT:
A plastic beverage closure including a base wall, a peripheral skirt and a plurality of threads on the inner surface of the skirt for engagement with the threads of a container which may be made of glass or plastic. The plastic closure includes a compression molded seal extending about the periphery of the inner surface of the base wall and the juncture of the base wall to the peripheral skirt. The closure includes a central axially thickened portion; a channel surrounding the thickened portion and extending radially to an annular radially thickened portion on the skirt at the juncture with the base wall. A concave surface extends from the base of the channel and merges with the surface of the annular portion. A compression molded liner is provided on the thickened portion, channel and concave surface of the closure and defines a planar sealing surface of contact with the end surface of the finish of a container and an arcuate surface for engaging the arcuate surface of a container. In other forms, the closure can be used as a closure for non-beverage products.

REFERENCES:
patent: 2131319 (1938-09-01), Greenholtz et al.
patent: 3828963 (1974-08-01), Moller
patent: 4343754 (1982-08-01), Wilde et al.
patent: 4721221 (1988-01-01), Barriac
patent: 5462187 (1995-10-01), Gregory et al.

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