Container closure

Details Container closure Container closure

1975-03-28

1976-07-27

Norton, Donald F.

Bottles and jars

Closures

Barrier permeable to gas and impermeable to liquid

215348, B65D 5116

Patent

active

039714896

ABSTRACT:
A method for producing a foamed plastic product suitable as liner material for container closures, including the steps of extruding a polymer composition foamable at atmospheric pressure into an air space at atmospheric pressure and then into a liquid quenching agent for stopping foaming and for setting, wiping against the quenched composition, and maintaining the residence time of the composition in the air space as a function of bubbling from the composition during the wiping.

REFERENCES:
patent: 2427699 (1947-09-01), Aronovsky
patent: 3002641 (1961-10-01), Normandy
patent: 3071276 (1963-01-01), Pellett
patent: 3326401 (1967-06-01), DeLong
patent: 3432452 (1969-03-01), Hersh

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