Method for the continuous production of tubular fo

专利名称：Method for the continuous production of

tubular foamed plastic pipe sleevesinsulating

发明人：Kurt Moser申请号：US05/650190申请日：19760119公开号：US04087501A公开日：19780502

摘要：A method for the continuous production of completely or partly foamedthermosetting polymerizable plastic articles, such as pipe insulation shells or sleeves.One or more sets of justaposed mold- carrying endless conveyors are employed whereinone conveyor of each set supports a series of longitudinally contiguous mold halvescomplementary with a series of longitudinally contiguous mold halves supported by theother conveyor of the set. The conveyors are advanced simultaneously, and during thejuxtaposed portion of travel define a laterally closed, longitudinally extended mold cavitywhich moves or advances. The cavity thus defined comprises a plurality of zonescorresponding to tube segments extending longitudinally in side-by-side, substantiallyplanar disposition, with thin hinge-forming channels interconnecting adjacent segmentzones. 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 ofthe conveyor in closed-mold condition is designed to permit rising and curing of the resinmaterial, at least to a condition such that the foamed article has sufficient physicalintegrity 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, planardisposition. This allows for a second operation to be performed on them, if desired, suchas a further molding operation to incorporate a layer of foam-forming material ofdifferent physical properties than the first. In any case, whether one or more moldedlayers are involved, the product has the advantage for purposes of shipping or storagespace economy of being flat and stackable, yet can be readily folded by articulating theintegrally hinged tube segments to form the fully closed finished tubular article.

申请人：THE UPJOHN COMPANY

代理机构：St. Onge, Mayers, Steward & Reens

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