| 摘要 |
<p>In a mixing tank (12), TAC is dissolved to solvent so as to be swollen. The mixture is fed to a heating device (15). The heating device (15) heats the mixture, such that the solid contents in the mixture may be dissolved. The mixture is fed out as dope from the heating device (15) to a cooling device (16). The dope is cooled down by the cooling device (16) to a surface temperature of a cooling drum (42). Thus impurities containing hemi cellulose and the like are precipitated, and the dope is filtrated such that the impurities may be trapped. The dope is cast onto the cooling device (16) while the precipitation of the impurities is prevented after casting.</p> |
