Method for production of thermoplastic resin foams

Details Method for production of thermoplastic resin foams Method for production of thermoplastic resin foams

1984-01-05

1985-10-22

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 461, 264 51, 264338, 264DIG14, 425325, 425404, 425817C, B29D 2700

Patent

active

045487758

ABSTRACT:
A method of producing thermoplastic resin foams is disclosed. The method comprising extruding an expandable resin through a plurality of holes bored in a die in the inside of a frame fitted to the extrusion end surface of the die in an adjacent relation therewith and fusing together the thus-extruded materials while they are expanded and still softened, wherein the inner surfaces of the frame are inclined at an angle of inclination ranging between 5.degree. and 30.degree., so that the cross-sectional area of the frame is increased toward the outer end thereof, and the extruded materials are fused together while kept in contact with the inner surfaces of the frame.

REFERENCES:
patent: 3720572 (1973-03-01), Soda et al.
patent: 3867493 (1975-02-01), Seki
patent: 4192839 (1980-03-01), Hayashi et al.

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