Process for producing polyurethane-foam moldings, and apparatus for same

Abstract

Process for producing polyurethane-foam moldings and apparatus for the same; the polyurethane-foam moldings are produced through the steps of pre-treating molds and injecting a foamable polyurethane resin reaction mixture into the molds; carrying the molds with the foamable polyurethane resin reaction mixture injected therein to a reservoir tank containing a heated liquid such as hot water or oil and dipping them into the liquid; and carrying the dipped molds out of the reservoir tank and opening them to take out the moldings thus produced. Such process for production of polyurethane-foam moldings is carried out by an apparatus in which a conveyance machine is so arranged as to delineate a circular orbit, in a normal plane, along which it moves circulating; molds in pairs are fixed to the conveyance machine along the length thereof at regular intervals; a reservoir tank is provided which accommodates a lower portion of the rotating orbit of the conveyance machine; said reservoir tank being filled with a heated liquid; thus molds pass through the liquid; and along the upper rotating orbit of the conveyance machine, the foamable polyurethane resin reaction mixture is put into the molds while moldings are taken out of the molds which have thus followed a cycle of production along the entire orbit of the conveyance machine. Further, in various apparatuses which can realize the above-described process of production, the molds used have the edges extending downward when the molds are in the liquid and the outer ends so bent as to extend horizontally.