| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a resin film of high quality prevented from becoming "distorted" in its winding without causing a phenomenon different in left and right in the elongation in the MD direction of the film, that is, a cellulose ester resin or norbornene resin film useful as the protective film for the polarizing plate of a liquid crystal display device. SOLUTION: In the method for manufacturing the resin film with a thickness of 30-125μm by a solution flow casting film forming method, the residual amount of the solvent in a web 10 after peeling is set to 20-120 wt.%. The web width in the region where the residual amount of the solvent is 20-80 wt.% of the web 10 in a drying process is set to 1,400-2,500 mm, the free spun length S of a guide roll 7 is set to 100-950 mm, the thickness of the web 10 in the residual amount of the solvent is set to 45-180μm, the feed tension of the web 10 is set to 80-190 N/m and the deflection of the guide roll 7 in that region is set to 5-70μm. The precision of the core shift of a tenter dryer 4 is set to 0.02-2 mm/m. COPYRIGHT: (C)2007,JPO&INPIT |
