Method for formation of polymer

Details Method for formation of polymer Method for formation of polymer

2006-07-18

2006-07-18

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S051000

Reexamination Certificate

active

07077986

ABSTRACT:
Objects of the present invention are to provide a method for molding polymers to be able to mold products each of which has an outer shape transferred accurately from the shape of the inside of a mold, exhibits high dimensional accuracy and is uniform in the thickness of its surface skin layer and the expansion ratio in its foamed inside.A molten polymer60is injected into a cavity30and simultaneously gas is pressed to the inside of the molten polymer60to contact the polymer close to the surface of the mold, and then gas is exhausted while maintaining the shape inside the mold, to thereby mold a polymer formed product in which a surface skin layer61and a foamed inside62having cushioning property are formed in one piece.

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