| 摘要 |
PURPOSE:To obtain film having favorable transparency at high film-making speed by a method wherein the portion exposed during casting of an endless carrier, onto which polymeric solution is cast for making filmy matter and, after that, from which the resulting filmy matter is stripped for the following casting, is filled with gas, the dew point of which is lower than the surface temperature of the carrier. CONSTITUTION:Cellulose triacetate solution is cast from a casting part 1 on a carrier 3 and dried and finally stripped through a stripping roller 2 in the form of film 5. In this case, a drum 6 is cooled in order to accelerate the gelation of cast filmy matter 4 and to increase the strength of the stripped film 5. In addition, a device 7 for shielding an exposed portion is provided so as to be fed with gas having the dew point, which is lower than the surface temperature of the carrier in order to prevent the transparency of the film from being impaired due to the deposition of dew on the carrier and the consequent loss of clarity of the cast film surface contacting with the carrier. |
