| abstract |
(57) [Problem] To provide a production method capable of obtaining a film having a uniform thickness and excellent smoothness even in a large area. In particular, when used as a method for producing a film for a polarizing film, the present invention provides a method for producing a film having a small optical spot and excellent optical performance. SOLUTION: When a polyvinyl alcohol film (product film) 9 is manufactured from a film forming raw material containing polyvinyl alcohol using a drum film forming machine having two or more drums, a polyvinyl alcohol film (PVA film) 4 is used. When the volatile content reaches 10 to 50% by weight, the polyvinyl alcohol film is peeled off from the drum located on the most upstream side, and further, the speed V1 of the drum located on the most upstream side, and the volatilization of the polyvinyl alcohol film The speed ratio V2 / V1 of the speed V2 of the drum located in the process in which the first time is less than 10% by weight is 1.0 to 1.0%. 1.3. |