Optimized flow to prevent core layer breakthrough

Details Optimized flow to prevent core layer breakthrough Optimized flow to prevent core layer breakthrough

2005-06-21

2005-06-21

Ortiz, Angela (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

C264S328800, C264S328120

Reexamination Certificate

active

06908581

ABSTRACT:
A method of co-extruding a plurality of plastic material flowing streams into a mold cavity produces a molded product. Inner and outer streams of covering plastic materials are combined with at least one interior stream that is to serve as an interior core of a resulting molded plastic product. The combined streams are forced to flow along annular flow paths, with the annular interior stream encased within the inner and outer annular covering plastic material stream layers. The flows of the interior stream and the inner and outer streams are controlled so that: the interior stream has a flow velocity that is greater than an average velocity of the combined stream, and the interior stream does not flow along or across a zero-velocity-gradient streamline of the combined streams.

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International Search Report for corresponding International Appln. No. PCT/US03/02867.

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