CONTINUOUS POLYMER FILM PRODUCTION METHOD, POLYMER FILM, ?/4 PLATE, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

Provided is a method for producing a continuous polymer film that involves: a step (1) for overlapping and bonding the rear end section of a preceding raw film and the front end section of a following raw film, along a bonding line; and a step (2) for supporting both end sections by means of a plurality of gripping tools and obliquely stretching the bonded raw film while conveying the bonded raw film in order to produce a polymer film. The oblique stretching is performed such that the angle formed between the in-plane slow axis of the polymer film obtained after oblique stretching and the width direction of the polymer film obtained after oblique stretching is within the range of 40-50°. In the bond between the rear end section of the preceding raw film and the front end section of the following raw film, the angle (f1) between the bonding line for the polymer film and the width direction of the polymer film and the angle (?1) between the in-plane slow axis of the polymer film and the width direction of the polymer film fulfill formula (I). Formula (I):| f1-?1 |=10°.