Process for production of foamed shaped pieces with poreless sur

Details Process for production of foamed shaped pieces with poreless sur Process for production of foamed shaped pieces with poreless sur

1976-07-09

1978-06-20

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 53, 264 54, 264DIG64, 264261, B29D 2708, B29F 500

Patent

active

040962199

ABSTRACT:
A process for producing foam-shaped pieces having a poreless and smooth surface from particulate expandable styrene polymer which comprises the steps of heating not prefoamed particles of expandable styrene polymer to a temperature between 100.degree. and 170.degree. C. under a pressure of between 3 and 30 bar to cause melting of the polymer cooling the melt polymer to temperatures of about 10.degree. to 40.degree. C. above the softening point of the styrene polymer, enlarging the capacity of the mold in which the particles are melted, expanding the resulting mold melt material without supplementary external delivery of heat and thereafter cooling the mold to about ambient temperature followed by removal of the shaped foamed piece.

REFERENCES:
patent: 2442940 (1948-06-01), Staudinger et al.
patent: 2962407 (1960-11-01), Aykanian
patent: 3054146 (1962-09-01), Griffin
patent: 3058161 (1962-10-01), Beyer et al.
patent: 3253064 (1966-05-01), Buonaiuto
patent: 3666850 (1972-05-01), Windecker
patent: 3705222 (1972-12-01), Rogers et al.
patent: 3767742 (1973-10-01), Robin
patent: 3812074 (1974-05-01), Oswitch et al.
patent: 3818086 (1974-06-01), Stastny et al.
patent: 3960996 (1976-06-01), Balevski et al.

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