Method of manufacturing a tough board of thermoplastic resin foa

Details Method of manufacturing a tough board of thermoplastic resin foa Method of manufacturing a tough board of thermoplastic resin foa

1978-04-27

1979-05-15

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 461, 264 53, 264171, 264DIG5, 264DIG14, 425325, 425817C, 428213, 428315, 428322, 521 51, B29D 2700

Patent

active

041547853

ABSTRACT:
A tough board of thermoplastic resin foam provided with skin layers on both surfaces thereof and formed of large cells elongated in the direction of the thickness of said board, wherein an intermediate high density layer thicker than 0.1mm lies substantially halfway between the upper and lower surfaces of said board. The board is formed by extruding thermoplastic resin containing dissolved foaming agent as a sheet, cooling the upper and lower surfaces rapidly to form solid skin layers and then slowly cooling while allowing controlled expansion thereof between expansion restricting members.

REFERENCES:
patent: 3431163 (1969-03-01), Gilbert
patent: 3431164 (1969-03-01), Gilbert
patent: 3444036 (1969-05-01), Russell et al.
patent: 3523988 (1970-08-01), Roehr et al.
patent: 3863000 (1975-01-01), Kasai et al.
patent: 4017245 (1977-04-01), Lang

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