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US 6,475,424 B1Granted
Multi-process molding method and article produced by same
AssigneeCambridge Industries, Inc.
InventorDick T. van Manen
Life of this patent
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Abstract
A method of manufacturing a multi-layered plastic manifold (10) including molding an outer layer (22) of the manifold (10) about a blow molded core insert (20). The outer layer (22) is molded by either a thermoplastic injection molding process or a urethane casting process. While the outer layer (22) is being molded, the pressure and temperature within the core insert (20) are controlled to preserve the structural integrity of the core insert (20).
Claims8
A method of manufacturing a molded article comprising the steps of:
- inflating a blow moldable article to form a blow molded article having an outer surface;
- inserting the blow molded article within an interior cavity of a mold;
- inserting moldable fluid material within the interior cavity of the mold adjacent the outer surface of the blow molded article;
- during said step of inserting the moldable fluid material, applying cooling fluid within the blow molded article at a temperature sufficient to maintain the shape of the blow molded article;
- and
- selecting the temperature of the cooling fluid based on the melting temperature of the blow molded article and the heat transfer from the moldable fluid material to prevent the blow molded article from losing structural integrity due to the heat transfer from the moldable fluid material.
3 more elements
Dependencies are inferred from the claim text.