Methods for producing phase-difference film and circularly polarizing plate involving simultaneous reduction of clip pitch on one side and increase of clip pitch on another side
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United States of America Patent
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Oct 31, 2017
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N/A
app pub date -
Mar 12, 2014
filing date -
Mar 29, 2013
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Abstract
Provided is a method capable of producing a retardation film being excellent in axial accuracy, showing small changes in retardation and dimensions at the time of its heating, and having a slow axis in an oblique direction with high production efficiency. The production method for a retardation film of the present invention includes: holding left and right end portions of a film with left and right variable pitch-type clips configured to have clip pitches changing in a longitudinal direction, respectively; preheating the film; causing the clip pitches of the left and right clips to each independently change to obliquely stretch the film; reducing the clip pitches of the left and right clips to shrink the film in the longitudinal direction; and releasing the film from being held with the clips.
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