Continuous process for the production of polystyrene foamed arti

Details Continuous process for the production of polystyrene foamed arti Continuous process for the production of polystyrene foamed arti

1981-12-15

1984-01-17

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 264321, B29D 2700

Patent

active

044260652

ABSTRACT:
This invention relates to a process for producing economically shaped article of polystyrene foam with a small wall thickness and sufficient strength by a continuous simple operation including a short forming cycle in which the sheet of polystyrene foam having a bulk density of 0.15 to 0.7 g/cm.sup.3, a thickness of 0.3 to 1.0 mm, 5 to 20 cell membranes widthwise of the sheet and a draw ratio of up to 1.25 and containing 0.03 to 0.3 mole/kg of the residual gas of the blowing agent is formed by an extruder and utilized to produce the shaped article.

REFERENCES:
patent: 3789095 (1974-01-01), Winstead
patent: 3879507 (1975-04-01), Cavanna et al.
patent: 3928182 (1976-08-01), Luthra

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