Method of reducing pinch deformation and contour lines in polyur

Details Method of reducing pinch deformation and contour lines in polyur Method of reducing pinch deformation and contour lines in polyur

1995-02-08

1998-06-30

Kuhns, Allan R

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 264 54, B29C 4402

Patent

active

057729360

ABSTRACT:
An improved process for cell opening of cellular polyurethane molded foam using timed partial pressure release (TPPR) reduces pinch deformation and contour lines by releasing the internal mold pressure in a curing cellular molded polyurethane foam product in a controlled manner which allows gas to escape from the mold, but which prohibits relative movement of the mold sealing surfaces by more than an imperceptible amount.

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