Process and apparatus for manufacturing foamed structures with i

Details Process and apparatus for manufacturing foamed structures with i Process and apparatus for manufacturing foamed structures with i

1985-12-30

1988-05-31

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 459, 264 50, 264 53, 264173, 264DIG5, 425 4C, 425 84, 425817C, C08J 934, B29C 6722, B29C 4714, B29C 4720

Patent

active

047479833

ABSTRACT:
A foamed thermoplastic article having an integral outer unfoamed skin layer is formed from a mixture of thermoplastic resin containing a blowing agent by removing at least a portion of the blowing agent in the die of the extruder. The blowing agent is removed, e.g., by modifying the die so that it incorporates a porous section whcih allows the blowing agent to be removed from the mixture.

REFERENCES:
patent: 2537977 (1951-01-01), Dulmage
patent: 3030623 (1962-04-01), Lehti et al.
patent: 3054142 (1962-09-01), Hinderer et al.
patent: 3299192 (1967-01-01), Lux
patent: 3466705 (1969-09-01), Richie
patent: 3857914 (1974-12-01), Aishima et al.
patent: 4022858 (1977-05-01), Cavanna et al.
patent: 4344710 (1982-08-01), Johnson et al.
patent: 4352893 (1982-10-01), Johnson et al.

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