| 摘要 |
PURPOSE:To attempt to improve accuracy of thickness deviation by a method wherein a sheet is passed through a warm water circulation type preheating water bath to control the preheat temp. and is uniaxially drawn in the transverse direction. CONSTITUTION:When a thermoplastic resin sheet is uniaxially-drawn in the transverse direction, this sheet is passed through a warm water circulation type preheating water bath 2 to control a preheating temp. to a specified temp. Then, the sheet is uniaxially drawn in the transverse direction to obtain a desired drawn film. |
