MANUFACTURE OF CELLULOSE TRIACETATE FILM

摘要

PROBLEM TO BE SOLVED: To rapidly dry a film at high temperature by specifying solvent content (by wt.%) of a cellulose triacetate film in a drying step, and starting to give tension to the film in its width direction at an arbitrary time point of the drying step. SOLUTION: Planarity or occurrence of irregularity of the cellulose triacetate film can be solved by drying a web 1 released by a releasing unit 4 while orienting it by a width orienting unit at the time point of 12-50 wt.% of its solvent content. And, it can also be solved by giving pressure of 0.2 to 10 kPa from both surfaces of the web by a pressurizing unit at the time of 10 wt.% or less of the solvent content.