| 摘要 |
Dope including a polymer and a solvent is discharged from a casting die (30) to a casting drum (31) while forming a casting bead (38). An upstream side (38a) area of the casting bead (38) is decompressed by a decompression chamber (36) to (atmospheric pressure-300) Pa. Air shielding plates (70, 71) are provided inside the decompression chamber (36). Openings (90) are respectively formed in upper half portions of the air shielding plates (70, 71). Adistance L (mm) between a contact position A of the casting bead (38) and the air shielding plate (70) is set in the range of 20 mm to 100 mm. After the casting bead (38) forms a casting film (39) on the casting drum (31), the casting film (39) is peeled and dried to obtain a TAC film. |
