Pressurization and storage of thermoplastic resin foams prior to

Details Pressurization and storage of thermoplastic resin foams prior to Pressurization and storage of thermoplastic resin foams prior to

1981-04-03

1982-11-23

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

264321, B29D 2700

Patent

active

043604846

ABSTRACT:
A method for decreasing the density of a substantially closed-cell thermoplastic resin foam material by the secondary expansion thereof. The method comprises increasing the gas pressure within the cells, retaining that elevated cell pressure for prolonged periods and then heating the foam material above its heat plastifying temperature to cause secondary expansion thereof. In an example, a low density polyethylene material was foamed to produce a foam with a density of approximately 0.085 grams per cubic centimeter. This foam was then pressurized with nitrogen and afterward secondarily expanded to produce a foam with a density of approximately 0.036 grams per cubic centimeter.

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