| 摘要 |
A dope containing a polymer and a solvent is discharged as a casting bead from a casting die onto a running (rotating) casting drum to form a casting film. First and second partition plates are provided upstream and downstream from the casting die, respectively. A third partition plate is provided upstream of a peeling roller disposed upstream of the casting die in the rotational direction of the casting drum. Dry air is supplied from a dry air circulator to a drying chamber defined by the second and third partition plates. A side labyrinth seal portion is provided close to the side end surface of the casting drum. A labyrinth seal portion of each of the first to third partition plates and the side labyrinth seal portion prevent dry air from entering the casting chamber even when flow volume of dry air is increased for high-speed casting.
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