| 摘要 |
<p>The objective of the present invention is to provide a method that is for producing an optical film and whereby, in a step for performing embossing, when a substrate film separates from an embossing roller, whisker-shaped fibrous contamination does not arise, and blocking does not arise when the film is in a roll shape. Namely, the method for producing an optical film produced by using an embossing device, which is provided with an embossing back roller and an embossing roller having an imprinting ring, to press the embossing roller to an elongated film that is the substrate, and after performing embossing, rolling up the film, is characterized by the film production speed being at least 80 m/minute and the surface roughness (Ra) of the side surface of the imprinting ring being 1-10 µm.</p> |
