| 摘要 |
<p>PURPOSE:To improve flattness by a method wherein a film which has been finished transverse elongation, after being gradually cooled the heat fixed temperature to the temperature of 150-165 deg.C, the temperature is gradually lowered starting from the end part of the width direction to the center part and next it is rapidly cooled and pulled out at the specially determined speed. CONSTITUTION:A transverse elongated film of poly-epsilon-capro amide is held by tenter clips on both selvage parts in a heat fixed furnace 21 and is fixed by heating for 2sec at the 196 deg.C temperature and furthermore for 2sec at 196 deg.C at the condition the space of tenter clips is narrowed 5% and the film is given slackness to the width direction. The film is gradually cooled to the temperature of 150-165 deg.C which being transported in the system at the speed of 24m per minute after finishing of heat fixation, and after that the product film 30 and its selvages are separated by cutting the selvages with cutting blades 28 just before the film is released from tenter clips, and the product film is wouned to a hauling winder loaded with drawing tension 45-145kg/cm<2>.</p> |
