Method and apparatus for controlling blown film thickness
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United States of America Patent
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Apr 13, 1993
Issued Date -
N/A
app pub date -
Sep 25, 1991
filing date -
Oct 24, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and apparatus for controlling the thickness of film made in a blown film machine having a rotating die, wherein a variable speed motor is used to control the haul-off speed of the film from the machine, by subdividing the die rotation into angular segments, measuring the blown film thickness at a point fixed in space and across each of the angular segments, and calculating an average film thickness for an angular segment, and comparing the measured thickness against a preselected desired thickness, and increasing or decreasing the speed of the variable speed motor to change the haul-off speed to bring the measured thickness into agreement with the preselected thickness.
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