| 摘要 |
This invention provides a process for producing an optical film, comprising a rubbing treatment step of rubbing a surface of a continuous plastic film (F) by a rubbing roll (4) around which a brushed cloth (4a) has been wound, a coating step of coating liquid crystalline molecules on the surface of the film, and a fixation step of fixing the liquid crystalline molecules. The process is characterized in that, in the rubbing treatment step, the film is supported on and transported by a transfer belt (3) having a metal surface, a plurality of backup rolls (5) are provided so as to support the lower surface of the transfer belt for supporting the film and to face the rubbing roll, and the rubbing strength RS defined by the following equation (1) is set to not less than 2600 mm (more preferably not less than 3400 mm). RS = N.M (1 + 2'r.nr/v)...(1)
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