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METHOD OF MANUFACTURING BIAXIALLY ORIENTED FILM, BIAXIALLY ORIENTED FILM, AND LIQUID CRYSTAL DISPLAY DEVICE EQUIPPED WITH BIAXIALLY ORIENTED FILM
METHOD OF MANUFACTURING BIAXIALLY ORIENTED FILM, BIAXIALLY ORIENTED FILM, AND LIQUID CRYSTAL DISPLAY DEVICE EQUIPPED WITH BIAXIALLY ORIENTED FILM
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机译:制造双轴取向膜,双轴取向膜和配备有双轴取向膜的液晶显示装置的方法
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摘要
PROBLEM TO BE SOLVED: To provide a method of manufacturing a biaxially oriented film with reduced display unevenness and deflection of an optical axis in the lateral direction of the film, and a liquid crystal display device equipped with the same.SOLUTION: The method of manufacturing a biaxially oriented film F3 includes that vertical stretching (X) and lateral stretching (Y) are sequentially performed on the film comprising a polypropylene resin. The lateral stretching (Y) has a step (Y1) (preheating step) of preheating the film at a preheating temperature equal to or above the melting point of the polypropylene resin, and a step (Y2) (lateral stretching step ) of laterally stretching the preheated film at a temperature lower than the preheating temperature at 2.55%/sec and 3.70%/sec distortion speed in the lateral direction.
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