Process and apparatus for producing thermoplastic resin foam

Details Process and apparatus for producing thermoplastic resin foam Process and apparatus for producing thermoplastic resin foam

1984-04-25

1985-04-02

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Repairing or restoring consumer used articles for reuse

521 82, 521 95, 521143, 521145, 521150, 521917, B29H 506

Patent

active

045086699

ABSTRACT:
In a process for producing a thermoplastic resin foam which comprises continuously heat-foaming a foamable thermoplastic resin sheet containing a heat-decomposable organic blowing agent with a heated gas, the improvement wherein a gas containing sublimation products generated by the heat-foaming of the foamable sheet is burned to decompose the sublimation products and obtain a treated gas having a substantially reduced content of the sublimation products, and the treated gas is then used as the heated gas for the heat-foaming of the foamable sheet; and a apparatus for producing a thermoplastic resin foam by continuously heat-foaming a foamable thermoplastic resin sheet, said apparatus comprising a heat-foaming chamber having an inlet portion for feeding the foamable thermoplastic resin sheet, an outlet portion for discharging the foamed sheet, a discharge port for a gas containing sublimation products generated by the heat-foaming of said foamable sheet, and a supply port for a heated gas, said discharge port and said supply port being connected by pipe lines to form a circulating pipe line, and said circulating pipe passage having a burning device for burning said gas containing sublimation products.

REFERENCES:
patent: 4124344 (1978-11-01), Kiyono et al.
patent: 4213975 (1980-07-01), Kiyono et al.

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