METHOD FOR PRODUCING OPTICAL FILM, OPTICAL FILM, AND APPARATUS FOR PRODUCING OPTICAL FILM

摘要

Disclosed are: a method for producing an optical film in which the release properties of a thermoplastic resin film from a touch roller is improved and transverse irregularities are not caused; an optical film produced by the production method; and an apparatus for producing an optical film. The method for producing an optical film comprises a casting step in which a molten material containing a thermoplastic resin is extruded into a film shape on the surface of a rotary support from a casting die; and a sandwiching and pressing step in which the film-shaped molten material extruded in the casting step is sandwiched and pressed between the rotary support and a sandwiching and pressing rotator. In the production method, in order to improve release properties between the sandwiching and pressing rotator and the film-shaped molten material, a release property adjusting agent is applied to the surface of the sandwiching and pressing rotator.