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US 5,516,474 AGranted
Thermally distinct layer coextrusion
AssigneeThe Cloeren Company
InventorPeter F. Cloeren
Life of this patent
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Abstract
The present invention provides a novel process for preparing composites including layers having thermally distinct processing requirements. Beneficially, the process may use a single manifold die. By the process, useful containers may be manufactured.
Claims17
An extrusion process comprising introducing a first stream and a second stream into an extrusion apparatus comprising a first thermally independent, flow channel and a second thermally independent, flow channel;
- passing said first stream through said first thermally independent flow channel, and passing said second stream through said second thermally independent, flow channel;
- thereafter converging said first stream and said second stream, said first stream and said second stream being thermally different, to form a composite, wherein the flow stream convergence is disposed relative to a locus at which transverse spreading begins, to limit loss of thermal differentiation;
- transversely spreading said composite while exposing a first face of said composite to a first thermally controlled, flow channel wall and a second face of said composite to a second thermally controlled, flow channel wall;
- and passing said transversely spread composite from said extrusion apparatus.
1 more element
Dependencies are inferred from the claim text.