Process for making polyurethane products which require crushing in preventing said products from substantially venting said products from substantially shrinking or changing dimensionally upon cooling

Abstract From the Canadian patent

A process for making molded high resilience polyurethane cellular products which require reduce crushing in preventing the products from substantially shrinking or changing dimensionally upon cooling which comprises:, exposing the curing product of atmospheric pressure while in contact with the confines of the mole at a time when the cell walls of the curing polyurethane cellular product have cured sufficiently to develop sufficient strength to partially resist bursting by the pressure of said expansion gases contained within the cell walls upon exposure to atmospheric pressure, but before the cell walls have cured sufficiently to develop sufficient strength so that exposure to atmospheric …