METHOD FOR PRODUCING ORIENTED FILM, POLARIZING FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY

摘要

PROBLEM TO BE SOLVED: To provide a dry orientation method for producing an oriented polyvinyl alcohol film which can obtain a high degree of orientation even when a wide original film is used. SOLUTION: In the method for producing the oriented film, when a heated unoriented polyvinyl alcohol film is subjected to dry longitudinally uniaxial orientation with tension applied by the difference between the circumferential speeds of rolls, the distance L between the rolls, when the width of the unoriented film is W, is set up to be L/W <=0.6, and the film is oriented and then heat-treated at 60-160 deg.C after being stretched further.