| 摘要 |
PURPOSE:To obtain a TAC film having good planeness wherein even if dope of high concentration is caused to flow at high speeds, melt fracture and sharkskin are not generated. CONSTITUTION:Warm water is circulated from a warm water source 9 to a warm water circulation hole 6 and at the same time hot water is circulated from a hot water source 10 to a hot water circulation hole 8 to keep temperatures of a die 1 at (b.p. -7 deg.C) to (b.p. -1 deg.C), under normal pressure, of dope and a lip portion 2 is kept at b.p. to (b.p. +30 deg.C), under normal pressure, of dope. Dope 13 which is kept at b.p. to (b.p. +30 deg.C), under normal pressure, of dope is loaded through a dope port 3 so that the dope is finally caused to flow out of a lip port 7. |
