Multilayer coextrusion apparatus
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United States of America Patent
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-
Oct 10, 1989
Grant Date -
N/A
app pub date -
Apr 29, 1991
filing date -
Sep 1, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coextrusion apparatus for producing a multilayer film or sheet of diverse thermoplastic materials has a slit die and a feedblock assembly integrated into the die. The assembly includes a removable feedblock received within a cavity of the die and has a plurality of slotted, layer distribution passages opening into a coathanger-type expansion chamber via a shallow entrance section. The passages are mutually spaced apart and lie parallel to the slotted outlet of the die.
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