| 摘要 |
A casting film (80) having a base layer and one outer layer on the base layer is formed by a co-casting. Viscosity of an outer layer dope was at most 40 Pa.s. Just after formation of the casting film (80), the drying air is fed out from an outlet (82a) opening to a belt (73). The temperature and the static pressure are respectively predetermined valued 50-160° C. and 50 Pa-200 Pa. The first outlet is partitioned by partitioning members, and meshed plates are attached to the partitions confronting to both side edge portions of the casting film (80). Another drying air is fed out from an outlet (83a) in a running direction of the belt 73. The temperature and the wind speed are respectively predetermined valued 50° C.-160° C. and 5 m/s-20 m/s. The occurrence of unevenness and foaming was reduced and a film excellent in planarity was produced. |
