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United States of America Patent
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Jun 13, 1989
Grant Date -
N/A
app pub date -
Sep 3, 1987
filing date -
Sep 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a novel coextrusion apparatus that includes a first flow channel of a greater width than a second flow channel, and an adjustable vane blade between the channels. By the use of interchangeable plates, this unique apparatus is able to prevent any selected layer or layers of a laminate from extending to the full laminate width. This highly advantageous result is obtained by the formation of an isolating edge that is an integral part of a layer or layers that extend the full laminate width. Also provided is process for forming a laminate having an isolating edge.
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