| 摘要 |
PURPOSE:To produce a thermoplastic resin sheet or film made excellent in appearance characteristics such as glossiness or surface smoothness regardless of thickness by preheating a metal endless belt. CONSTITUTION:The film like thermoplastic resin 2 extruded from a T-die 1 in a molten state is cooled while pressed between a casting drum 3 and the corrosion-resistant endless metal belt 4 fitted over at least three metal rolls having horizontal axial lines and having flexibility imparted thereto under definite tension in a circular arc shape to be formed into a sheet. At this time, the belt 4 is preheated in the long section of the upstream region of the casting drum by a heating device A. |
