纺纱牵伸波的产生机制及其消除方法

 针对纺纱牵伸过程中的牵伸波问题，分析在罗拉牵伸系统中短纤纱产生牵伸波的机制，认为纤维之间静摩擦因数大于动摩擦因数导致的黏滑运动是罗拉牵伸系统产生牵伸波的主要原因。提出对罗拉牵伸区的纤维束施加高频微幅波，使牵伸区的纤维之间产生高频的微小相对运动，且纤维之间总是处于动摩擦状态，显著降低导致牵伸波的纤维捆绑效果，从而避免黏滑效应，有效地消除牵伸波。这一设想通过实验得到验证。这种方法可应用于新型纺纱牵伸系统的开发。

Mechanism of generation of drafting waves during spinning and the way to eliminate it

The generating mechanism of the staple yarn’s drafting waves during roller drafting is analyzed. It is assumed that the generation of drafting waves during roller drafting is mainly ascribed to the fiber-to-fiber static friction coefficient is greater than the dynamic one. It is proposed that a high frequency undulating wave is imposed on the fiber strand in the drafting zone of roller system so that a high frequency and slight relative movement occurs between the fibers in the drafting zone, and the fiber-to-fiber friction is dominated by the dynamic friction rather than the static one, and thus the “stick-slip” motion will be eliminated. As a result, the fiber binding effect causing drafting waves can be significantly reduced. This hypothesis is verified by experiments, and it can be applied to the development of new spinning drafting devices.