Method of molding a mechanically frothed urethane resin foam and

Details Method of molding a mechanically frothed urethane resin foam and Method of molding a mechanically frothed urethane resin foam and

1982-08-30

1983-11-01

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

249 63, 249 64, 249 83, 249117, 249122, 249175, 264 469, 264 50, 264DIG83, 425 4R, 425127, 425543, 425817R, B29D 2700

Patent

active

044129629

ABSTRACT:
Improved mold structure and method of molding for mechanically frothed urethane foams is presented. The mold is filled from the bottom via an annular runner which communicates with the mold cavity. The connection between the annular runner and the mold cavity is restricted to create a back pressure in the circumferential runner.

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patent: 4098855 (1978-07-01), Fries

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