Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1981-02-20
1983-08-16
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 461, 264 48, 264321, 264DIG14, 425325, 425817C, B29D 2700, B29F 308
Patent
active
043990860
ABSTRACT:
The invention relates to a process for the continuous manufacture of foamed sheets of thermoplastic material having an extreme width to thickness ratio, small thickness tolerance, a uniform cell structure and, over the whole cross section on both sides of the sheet a thin, non-foamed outer skin. The plastic, which already contains the foaming agent is, on emerging from a wide-slit nozzle, allowed to foam freely without any restriction and cool. The sheet or strip formed in this manner is then heated locally at the surface and calibrated to final dimension.
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Anderson Philip E.
Swiss Aluminium Ltd.
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