| 摘要 |
PURPOSE: A producing method of a polyester film is provided to have an excellent heat-adhesive property and a processing property on drawing even at a low temperature under 120°C regardless of the thickness of a film. CONSTITUTION: A polyester resin extruded with air to have a heat contact face on one face and a non-heat contacted face on the other surface is molded in a sheet shape. Then, each preheating roll(1,2,3,4,5,6,7,8) made up to sequentially increase the temperature of a roll surface since it is possible to control a temperature, and the sheet is rolled by heating with an infrared ray electric heater consisted in the center between rolling rolls(9,9') and cooling rolls(10,10'). Herein, the temperature of the surface in each preheating is controlled to sequentially rise in a range under a heat viscosity temperature, and the temperature of the preheating rolls and the rolling roll of the surface is controlled to sequentially rise in a range over a rolling temperature.
|
