Multi-staged foaming of thermoplastic resin

Details Multi-staged foaming of thermoplastic resin Multi-staged foaming of thermoplastic resin

1980-12-02

1982-06-29

Anderson, Philip

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 22, 264 55, 264342RE, 264DIG18, 521 79, 521 95, 521145, 521149, 521150, B29D 2700

Patent

active

043373216

ABSTRACT:
A method for foaming heat foamable thermoplastic resin preforms and the product produced thereby. Said preforms are foamed in a series of foaming stages, said series comprising at least one stress-relieving foaming stage and at least one additional foaming stage subsequent thereto and at a higher temperature. This method facilitates the production of foam sheets, slabs and planks of better quality than that provided by previously known single stage foaming methods. In an example, a crosslinked, expandable, polyethylene preform is foamed by such a method using two foaming stages.

REFERENCES:
patent: 3562367 (1971-02-01), Shinohara et al.
patent: 3711584 (1973-01-01), Sagane et al.
patent: 3812225 (1974-05-01), Hosoda et al.
patent: 3818086 (1974-06-01), Stastny et al.
patent: 4143106 (1979-03-01), Coyne
patent: 4155965 (1979-05-01), Allada
patent: 4213925 (1980-07-01), Kiyono et al.

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