Oriented film producing facility with thickness and orientation control means
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
Apr 30, 1998
filing date -
May 1, 1997
priority date (Note) -
Expired
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Abstract
A drawing system in which a thickness and degree of orientation of an oriented film or the like is maintained in a uniform manner under a condition of a high speed, shortened is a time required from a time when a molding material is charged in an extruder and drawing started until a time when a film is taken up on a take-up apparatus, and a high quality film or the like is produced at a high speed and besides, a probability for a not-oriented or oriented film or the like to be broken down during drawing is reduced. A thickness and degree of orientation of a film are independently measured in thickness gauges and a film orientation measuring apparatus in a continuous manner after longitudinal drawing or lateral drawing and measured values are input to a computer. The computer input with the measured values respectively compares preset target values with the measured thickness and degree of orientation and a control operation to change a longitudinal draw ratio is conducted if the measured values are different from respective preset values based on results of comparison processing.
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