Method of providing closed-cell polyolefin foam having reduced b

Details Method of providing closed-cell polyolefin foam having reduced b Method of providing closed-cell polyolefin foam having reduced b

1991-02-08

1992-06-23

Jones, W. Gary

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264148, 264150, 264321, B29C 6722

Patent

active

051240971

ABSTRACT:
A method of providing closed-cell polyolefin foam having reduced blowing agent content to an end user including (a) extruding the polyolefin to form the essentially continuous foam structure defining a multiplicity of channels extending generally longitudinally therethrough; (b) intermittently crimping the essentially continuous foam structure such that the channels extending therethrough are intermittently substantially closed off; (c) intermittently severing the essentially continuous, intermittently crimped foam structure at the crimps therein to form discrete foam structure portions having crimped end portions; (d) cooling the crimped, discrete foam structure portions to an extent sufficient to prevent substantial shrinkage of the crimped, discrete foam structure portions upon initiation of release of the flammable blowing agent from the foam; (e) excising the crimped end portions from the remainder of the crimped, discrete foam structure portions to initiate release of the flammable blowing agent and form uncrimped, discrete foam structure portions; and (f) providing the uncrimped, discrete foam structure portions to the end user.

REFERENCES:
patent: 3573152 (1939-03-01), Wiley et al.
patent: 3789095 (1974-01-01), Winstead
patent: 4134945 (1979-01-01), Milford et al.
patent: 4487731 (1984-12-01), Kobayashi
patent: 4577998 (1986-03-01), Dorrn
patent: 4640933 (1987-02-01), Park
patent: 4824720 (1989-04-01), Malone

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