Method for producing cellulose acylate film
AssigneeKonica Corporation
InventorAkihiko Takeda
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Abstract
A method for producing a cellulose acylate film is disclosed. The method comprises the steps of, casting dope containing cellulose acylate on a surface of a metal support, peeling off a web formed by casting the dope from the metal support, contacting surface of the web which has been contacted with the surface of the metal support, with a first roller just after the peeling off of the web from the metal support surface, consequently, contacting the surface of the web which has been exposed to air on the metal support, with a second roller, and drying the peeled web.
Claims14
A method for producing a cellulose acylate film comprising the steps of:
- casting a dope containing cellulose acylate and solvent on a surface of a metal support to form a web;
- peeling the web from the metal support,
- wherein the peeled web has a remaining solvent content from 70 to 120%, and the metal support has a surface temperature at time of peeling Tb;
- contacting a surface of the peeled web with a first roller wherein the first roller has a surface temperature Tr, which is controlled so that the relation of Tr and Tb is (Tr−Tb)≦50° C., and the first roller has a surface roughness Rmax not more than 1.0 μm;
- and
- drying the peeled web.
Dependencies are inferred from the claim text.