B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/673
B29C 67/20 (2006.01) B29C 44/56 (2006.01)
Patent
CA 1221212
Abstract of the Disclosure 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 com- prising a heat-foaming chamber having an inlet portion for feeding the foamable thermoplastic resin sheet, an outlet portion for discharging the foamed sheet, a dis- charge 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.
452876
Hirunuma Masanori
Iwai Noboru
Kaneko Junichi
Sekisui Kagaku Kogyo Kabushiki Kaisha
Smart & Biggar
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