| 摘要 |
PROBLEM TO BE SOLVED: To provide a solution film forming method and solution film forming apparatus which eliminate the possibility of dent parts periodically occurring in a lengthwise direction when manufacturing a long-sized film with a thickness of 50 μm or less by applying a drawing process in a width direction.SOLUTION: A solution film forming apparatus 10 comprises a flow casting die 24, a pair or rollers 22, 23, a belt 21, and a tenter 16. The belt 21 is made of a metal and annularly formed by welding. The flow casting surface of the belt 21 on which a dope 11 is flow-cast is temperature-controlled by the rollers 22, 23. The rear surface of the belt 21 should have a weld height in a range from 3 μm or more to 30 μm or less. A film 12 is drawn in a width direction while transferred held by a clip 31 of the tenter 16. The film 12 is dried in the tenter 16.SELECTED DRAWING: Figure 1 |
