Abstract: A processing method of an optical film comprising the step of: subjecting a long length roll-film continuously conveyed to a treatment so as to be brought in contact with a processing solution containing at least one type of gas selected from reducing gas and oxidizing gas.

Abstract: A method of optical-film treatment in which coating troubles apt to occur in the formation of a functional layer, e.g., an antireflection layer, on a continuous film by coating fluid application, such as transverse thickness-difference lines, coating streaks, and tailing, are diminished. The method of optical-film treatment comprises wetting with a liquid a continuous film which is being continuously conveyed, continuously rubbing the continuous film with an elastomer, and then removing the liquid from the continuous-film surface, and is characterized in that the surface of the elastomer has a coefficient of static friction of 0.2-0.9.

Abstract: An object of the present invention is to provide a method of treating an optical film wherein coating defects such as chatter, coating streaks and comet failure which are easily caused, when coating a functional layer such as an anti-reflection layer on a long-length film, are improved, as well as an apparatus of treating an optical film. Disclosed is a method of treating an optical film possessing the steps of rubbing a long-length film transported with elastomer moisturized with liquid, and removing the liquid on a surface of the long-length film, wherein an elastomer surface has a static friction of 0.2-0.9.