| abstract |
According to the present invention, by controlling the surface temperature of the cooling drum so that the surface temperature of the downstream cooling drum is lower than the upstream cooling drum and cooling the film little by little, slippage and shrinkage on the surface of the cooling drum are suppressed. Therefore, since generation | occurrence | production of a defect in a film can be suppressed, the high quality thermoplastic film for optical uses can be manufactured. n n Thermoplastic film |