Abstract: 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.

Abstract: In a pin tenter, a wet film is conveyed and dried in a state that edges of the wet film are pierced by pins. The plurality of pins are fixed to a pin plate. The pin plate is supported by a pin carrier. The pin carrier is disposed between rails. Movement of the pin carrier is guided by the rails. Nitrogen gas is supplied through a nozzle to the inside of a rail cover in a gas purge area, and thus the inside of the rail cover is pressurized. Atmospheric gas containing solvent gas in the pin tenter is prevented from entering the inside of the rail cover. Accordingly, precipitation of additives and the like on the rails and the pin carrier is eliminated. A suction device sucks nitrogen gas together with foreign substances such as dust from the inside of the pressurized rail cover.

Abstract: 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.

Abstract: In a pin tenter, a wet film is conveyed and dried in a state that side edges of the wet film are pierced by pins. The plurality of pins are fixed to a pin plate. The pin plate is supported by a pin carrier. The pin carrier is disposed between rails. Movement of the pin carrier is guided by the rails. In a steam cleaning area, steam is blown onto the pins, the pin plates, the pin carriers, and the like so as to remove foreign substances adhered thereto. In a jet gas cleaning area, nitrogen gas blows off residual foreign substances and residual water content remained from the steam cleaning.

Abstract: In a pin tenter, a wet film is conveyed and dried in a state that edges of the wet film are pierced by pins. The plurality of pins are fixed to a pin plate. The pin plate is supported by a pin carrier. The pin carrier is disposed between rails. Movement of the pin carrier is guided by the rails. In a steam cleaning area, foreign substances adhered to the pins, the pin plates, and the pin carriers are removed by blowing steam. In a jet gas cleaning area, residual foreign substances and residual water content after the steam cleaning are blown off and removed by blowing nitrogen gas.