Method and apparatus for tube extrusion
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United States of America Patent
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-
Mar 15, 1983
Issued Date -
N/A
app pub date -
May 22, 1978
filing date -
Mar 31, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Reduced breakage and reduced internal gas pressure is achieved in the trapped bubble process for the preparation of film by applying vacuum to the region of the tube where the bubble starts to form.
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