The Upjohn Co.

Kurt Moser

Alfred Schlieckmann

Joseph F Sanson

A method and apparatus are disclosed for preshaping a sheet material, more particularly a textile and/or a plastic sheet, under differential pressure in a molding die, whereby to form a sack-like structure which becomes integrally incorporated as the cover of a foamed plastic cushion, vehicle seat, protective padding element or similar article, by the introduction of a self-foaming elastomeric material into the sack while it is being held in the molding die.

Method of making a foam plastic cushion having a peripheral frame and an

A method and an apparatus are disclosed for vacuum or gauge pressure shaping of extensible sheet material in a mold, more particularly pre-shaping of a textile or plastic sheet or film used as an integral skin for a foam cushion, to effect uniform stretch of the sheet throughout its area notwithstanding substantial depth variation in surface contour of the final shaped sheet material.

Integral skin cushion molding apparatus

A method for the continuous production of completely or partly foamed thermosetting polymerizable plastic articles, such as pipe insulation shells or sleeves. One or more sets of justaposed mold-carrying endless conveyors are employed wherein one conveyor of each set supports a series of longitudinally contiguous mold halves complementary with a series of longitudinally contiguous mold halves supported by the other conveyor of the set. The conveyors are advanced simultaneously, and during the juxtaposed portion of travel define a laterally closed, longitudinally extended mold cavity which moves or advances. The cavity thus defined comprises a plurality of zones corresponding to tube segments extending longitudinally in side-by-side, substantially planar disposition, with thin hinge-forming channels interconnecting adjacent segment zones. A thermosetable foam-forming resin mix is distributed on to one of the complementary mold halves prior to closing of the mold cavity. The length of travel of the conveyor in closed-mold condition is designed to permit rising and curing of the resin material, at least to a condition such that the foamed article has sufficient physical integrity to be safely handled on discharge from the mold cavity. As discharged, the integrally hinged tube segments of the molded product are in substantially flat, planar disposition. This allows for a second operation to be performed on them, if desired, such as a further molding operation to incorporate a layer of foam-forming material of different physical properties than the first. In any case, whether one or more molded layers are involved, the product has the advantage for purposes of shipping or storage space economy of being flat and stackable, yet can be readily folded by articulating the integrally hinged tube segments to form the fully closed finished tubular article.

Method for the continuous production of tubular foamed plastic pipe

A system is disclosed for a plural component plastics reaction injection molding machine which provides continuous supply and recycling of each of a plurality of liquid components between a mixing head and separate supply tanks for the respective liquid components. The system is designed to use a portion of the respective recycle conduits of the several components as supply conduits to the head, in parallel with the normal supply conduit to the head, during periods of reaction injection taking place in the mixing head, whereby to permit the employment of smaller diameter conduits in the aforesaid portions of the system without reducing the capacity of the molding system. Further economy is achieved by design of the aforesaid portions of the conduit systems to dispose either the supply or recycle conduit concentrically within the other.

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Kirchheim, Germany

Kurt Moser