Method for production of thermoplastic resin foams

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

B - Operations, Transporting

29

C

18/663

B29C 67/20 (2006.01)

Patent

CA 1221211

ABSTRACT OF THE DISCLOSURE 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 or the die in an adjacent relation therewith and fusing together the thus-extruded materials while they are expanded and still softened, where- in the inner surfaces of the frame are inclined at an angle of inclination ranging between 5 and 30°, 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.

444934

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