Abstract: A method for manufacturing a treated resin film from a long resin film, the method including at least treatment steps each including treating the long resin film by bringing the long resin film into contact with a treatment liquid in a treatment tank, while feeding the long resin film, wherein at least one of the treatment steps is a one-side contact step including bringing a lower surface of the resin film into contact with a surface of the treatment liquid in the treatment tank that is filled with the treatment liquid, and nip rolls are placed downstream of at least one one-side treatment tank for the one-side treatment step. The method is capable of satisfying the properties required of the treated film and also capable of reducing the occurrence of scratches, dents, and other defects.

Abstract: Disclosed is a method for fabricating an optical film, comprising a treatment step comprising: continuously feeding a film, while holding both transverse end portions of the film; and bringing a lower surface of the film into contact with a surface of a treatment liquid with which a treatment tank is filled, while continuously feeding the film. The method for fabricating a polarizing film in which bringing a liquid into contact with a film and transversely stretching the polymer film by a tenter method or the like can be performed at the same time using a small and simple fabricating apparatus.