Method for initiating biaxial stretching of plastic tubes and apparatus therefor
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United States of America Patent
Stats
-
Sep 22, 1981
Grant Date -
N/A
app pub date -
Jan 24, 1980
filing date -
Jan 27, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for rendering initiation of stretching easier in the production of biaxial stretched film of plastic tube carried out by enclosing gas in said tube and by the difference in the peripheral velocity between delivery nip rolls and take-up nip rolls is provided. This method is characterized by passing said tube between at last one pair of nipping means for enclosing gas, having therebetween a clearance adjustable in the range of 1.about.10 mm. The nipping means are provided before or behind said take-up nip rolls and driven at a peripheral speed same as that of said take-up nip rolls.
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