纺程加张力对PET纤维结构形成的影响

在熔融纺丝过程中,纺程张力是控制纤维结构形成的重要结果参数之一。大多数工艺参数都间接地或直接地反应在张力上,而张力又直接影响纤维的结构形成过程。本文采用在纺程上施加一定张力(0.10～0.15GPa)的方法,获得了强力较高的纤维。借助经典的测试分析方法,研究纺程加张力对纤维结构形成及性能的影响。结果表明:纺程加张力对纤维的结晶形成影响较小;而对纤维的取向结构,尤其是无定形取向结构有很大的促进作用。在施加的张力范围内,纤维的无定形取向因子f_(am)可达到0.53～0.72,比常规速纺PET纤维的无定形取向f_(am)高得多。这说明了PET在一定条件下取向与结晶可以分别进行;高取向的纤维更容易结晶.

EFFECT OF ON-LINE STRESS ON POLYESTER FIBER STRUCTURE

Stress on spinning line is one of the important factors for melt spinning, most of the processing parameters are related to stress and have direct effect on fiber structure. By applying stress on sp inning line at the winding speed 4000m/min, fiber having high tensile strength is obtained and the effect of stress on fiber structure and property is investigated by conventional methods of analysis the results show that the applied stress on the spinning line has a little effect on the forming of crystalline structure but has great effects on orientation, especialy on amorphous orientation. In the range of the applied stress, the amorphous orientation factor can reach to 0.35-0.72 much higher than that of conmon high speed spinning polyester fiber, it implies that the orientation and crystallization may be take place seperately.