Method of rotational molding

Details Method of rotational molding Method of rotational molding

1974-02-25

1976-10-05

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

229 15B, 264 457, 264310, 264DIG5, B29C 504, B29D 2704

Patent

active

039845117

ABSTRACT:
The method of forming, by rotational molding, a foamed polystyrene article that has a continuous covering of thermoplastic material such as low density polyethylene. The method requires the utilization of polystyrene beads that contain substantially less than the maximum possible percentage of blowing or expanding agent. A high temperature, low residence time heating step is found to be adequate for the formation of the article.

REFERENCES:
patent: 3255286 (1966-06-01), Luc-Belmont
patent: 3309439 (1967-03-01), Nonweilber
patent: 3405202 (1968-10-01), Kjell-Berger
patent: 3452390 (1969-07-01), Borcovec
patent: 3457205 (1968-07-01), Nonweiler

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