| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a film which is improved in an irregularity of a thickness by enabling a slit clearance to be highly precisely and finely adjusted by a method wherein a slit clearance for extruding a solution film in a mouthpiece is formed by a pair of lips, and heat bolt is used for one side of slit clearance-adjusting means at both lips. SOLUTION: A solution film 3 is cast on a transfer cast face 4 from a slit clearance 2 of a mouthpiece 1. The slit clearance 2 is formed between a pair of lips 5a, 5b arranged opposed to each other. Further, a manual bolt 6 for adjusting the slit clearance 2 by displacing the lip 5b is provided in one side lip 5b. Furthermore, a heat bolt 8 which is expanded or contracted by radiation of heat from a built-in heating element 7 is arranged in the other lip 5a. Then, a thickness of the film is measured with a thickness meter, and an electric power or the like of the heating element 7 is controlled by a controller based on the measured result. Thereby, the heat bolt 8 is elongated or contracted, and the slit clearance 2 is expanded or contracted. |
