Method of coextruding plastics to form a composite sheet
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United States of America Patent
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Jun 4, 1985
Grant Date -
N/A
app pub date -
Dec 4, 1981
filing date -
Dec 4, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention pertains to a method of producing a composite sheet of plastic materials by means of coextrusion. Two plastic materials are matched with respect to their melt indices. These matched plastic materials are then coextruded in a side-by-side orientation while hot and soft to form a composite sheet having a substantially uniform demarkation therebetween. The plastic materials are fed at a substantially equal extrusion velocity and generally have substantially equal viscosities. The coextruded plastics can be worked after coextrusion while they are still hot and soft.
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