Process for producing tubular film from thermoplastic molten material
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United States of America Patent
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-
Sep 3, 1991
Issued Date -
N/A
app pub date -
Mar 6, 1990
filing date -
Jan 23, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing tubular film from a thermoplastic molten material, including supplying an annular stream of thermoplastic material through a passageway substantially free of flow interurptions having a plurality of axially aligned-annularly spaced feed ports, funneling and recombining the annular stream of thermoplastic material after being supplied through the feed ports to evenly recombine the thermoplastic material, and forming a tubular stream of thermoplastic film having a substantially uniform thickness throughout.
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