| 摘要 |
PROBLEM TO BE SOLVED: To suppress an impact at the time of feed of a dope to a manifold. SOLUTION: The dope 31 is cast by a casting die 12 to form a cast film 13. The coat hanger-shaped manifold 33 is provided to the casting die 12 and an inclined surface 33a receiving the feed of the dope 31 is formed to the manifold. The inclined surface 33a is formed into a gentle surface 37 with a radius of curvature of 500 mm or more protruded toward the inlet of the dope 31 over a range W of 5-20 mm on the basis of the center line 36 of the casting die 10. The impact at the time of feed of the dope 31 from a flow channel 32 to the manifold 33 is suppressed by the gentle surface 37. The film thickness of the formed multilayered cast film 13 becomes uniform and the multilayered cast film 13 excellent in optical characteristics can be obtained. COPYRIGHT: (C)2003,JPO |
