| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an optical film, which allows production of a high quality film free from streak-like defects, in a melt film-forming method.SOLUTION: In the method for producing an optical film comprising discharging a resin plasticized by melting means in a film-like shape from a die, the joining part on a resin flow passage from the tip end on the downstream side of the melting means to the die is configured so that R of the edge part, brought into contact with the flow passage, in the cross section of the joining part is 40 μm or less, and further, the maximum deviation of the flow passages in the joining part cross sections of both members to be joined is set to 50 μm or less. |
