The reasons, which result in over length fiber, double length fiber, crimp ratio waving and specific resistance rising, were discussed.
探讨了生产涤纶短纤维过程中产生超长、倍长纤维， 卷曲率波动和比电阻升高的原因。
2
In this paper the distortion of image collimating system is analyzed, and then an on-line self-calibration method with double-frequency laser length measuring result as length datum is presented.