METHOD FOR MANUFACTURING CELLULOSE ESTER FILM, METHOD FOR CLEANING INFINITELY TRANSFERRING ENDLESS METAL SUPPORT SURFACE, CELLULOSE ESTER FILM, AND PROTECTIVE FILM FOR POLARIZING SHEET

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a cellulose ester film not almost generating a transverse step, especially, the cellulose ester film useful as a protective film for a polarizing sheet.;SOLUTION: In the method for manufacturing the cellulose ester film by a solution casting film forming method, a wind is applied to the cast film, which is cast on an infinitely transferring endless, metal support from a die, from an upstream side and/or a downstream side so that the horizontal component of the maximum wind velocity thereof becomes 4 m/sec or less and the deviation of the velocity of the wind applied to the cast film in the whole width direction thereof becomes 20%.;COPYRIGHT: (C)2002,JPO