Polystyrene foam extrusion into a foam assisting atmosphere

Details Polystyrene foam extrusion into a foam assisting atmosphere Polystyrene foam extrusion into a foam assisting atmosphere

1982-04-30

1983-12-06

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264321, 264DIG15, 425 72R, 425817C, B29D 2700

Patent

active

044193092

ABSTRACT:
In the process of preparing a thermoplastic resin foam the improvement comprising extruding a molten resin-blowing agent combination from a high pressure region to a lower pressure atmosphere of carbon dioxide, water vapor or mixtures thereof.

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patent: 3954929 (1976-05-01), Hoenke
patent: 4056587 (1977-11-01), Honkanen et al.
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