Process for producing thermoplastic resin film of markedly reduced thickness unevenness
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United States of America Patent
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-
Oct 13, 1981
Grant Date -
N/A
app pub date -
Dec 26, 1979
filing date -
Jan 5, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing a film of a thermoplastic resin, characterized in that the rotation of a cooling drum for cooling a molten film-like extrudate is controlled such that the variation rate (%) of instantaneous rotation under no load (as defined in the specification) is less than about 1%, and that the cooled film-like extrudate is withdrawn from the cooling drum so that substantially no tension in the subsequent stretching step is exerted on the film-like extrudate on the cooling drum. The process is preferably applicable to a film-forming apparatus which operates at high speeds. A film having markedly reduced thickness unevenness is produced.
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