Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
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
Anderson Philip
Dart Industries Inc.
Hovet Kenneth J.
Taylor Leigh B.
Wylie Paul R.
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