High gas barrier plastic closure

Details High gas barrier plastic closure High gas barrier plastic closure

1985-09-03

1987-02-03

Norton, Donald F.

Bottles and jars

Closures

With pressure-responsive seal

215347, 215351, B65D 5304

Patent

active

046404287

ABSTRACT:
A plastic closure system for containers or bottles containing liquids under pressure, such as carbonated soft drinks. A liner incorporating a high gas barrier material such as "Eval" in a relatively thin layer is positioned over the end of the container neck. The liner is mechanically designed to have increased sealing forces applied thereto due to the internal pressure acting against the liner. In one embodiment, an overcap mechanically biases the liner over the edge of the container finish with internal gas pressure acting in the opposite direction, thus increasing the sealing force. The other embodiments incorporate a seal that has an annular, enlarged edge that is trapped between the finish and cap with pressure increasing the sealing force.

REFERENCES:
patent: 1978946 (1934-10-01), Horner
patent: 4122964 (1978-10-01), Morris
patent: 4390552 (1983-06-01), Niwa
patent: 4564117 (1986-01-01), Herbert

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