Process for producing moldings from foamed polyolefins

Details Process for producing moldings from foamed polyolefins Process for producing moldings from foamed polyolefins

1996-03-29

1997-04-08

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 51, 264 53, B29C 4402

Patent

active

056184786

ABSTRACT:
A process for producing a molding from prefoamed polyolefin particles, involving: shrinking the prefoamed polyolefin particles to a volume of from 30 to 95% of the prefoamed polyolefin particles original volume to provide shrunken particles; treating the shrunken particles at a temperature lying at least 20.degree. C. below the softening temperature of the shrunken particles, in an inert gas atmosphere under a gauge pressure of from 0.2 to 10 bar, for a time sufficient to provide expansion of the shrunken particles upon removal of the pressure; charging the particles into a mold with substantial maintenance of internal pressure of the particles; and foaming the particles, to provide moldings of very low density useful in applications such as packaging and soft upholstering in motor vehicle interiors.

REFERENCES:
patent: 2768407 (1956-10-01), Lindemann
patent: 3504068 (1970-03-01), Zizlsperger et al.
patent: 4685872 (1987-08-01), Erlenbach
patent: 4818451 (1989-04-01), Arai et al.
patent: 5308560 (1994-05-01), Bibby et al.
patent: 5380766 (1995-01-01), Traeger et al.
patent: 5480599 (1996-01-01), Leven et al.

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