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US 4,904,512 AGranted
Compression-molded article having multilayer structure
AssigneeToyo Seikan Kaisha, Ltd.
InventorsMuneki Yamada, Kiyoshi Kawaguchi
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AssigneeToyo Seikan Kaisha, Ltd.
InventorsMuneki Yamada, Kiyoshi Kawaguchi
Estimating the term…
A multilayer compression-molded article produced by compression-molding a composite plastic material. The composite plastic material comprises a first synthetic resin and a second synthetic resin in which the first synthetic resin surrounds substantially the entire second synthetic resin. The compression-molded article comprises a first resin layer molded from the first synthetic resin and a second resin layer molded from the second synthetic resin in which the first resin layer surrounds substantially the entire second resin layer. The composite plastic material is obtained by an extrusion apparatus which intermittently extrudes the second synthetic resin via a subsidiary extrusion flow passage into a main extrusion flow passage in which the first synthetic resin flows.
A compression-molded article having a multilayer structure comprising a first resin layer molded from a first synthetic resin and a second resin layer molded from a second synthetic resin, said first and second synthetic resins being dissimilar, said first resin layer completely surrounding the entire second resin layer, said article being produced by compression-molding of a heat-molten composite plastic material formed by intermittently extruding the second synthetic resin, in molten condition, into a main extrusion flow path for the first synthetic resin whereby the first resin, in molten condition, completely surrounds the second resin, and thereafter extruding the composite plastic through an extrusion opening in the main extrusion flow passage with the first resin completely surrounding the second resin.
Dependencies are inferred from the claim text.