The magnitude and unforomity of withdrawal tension druing over-end unwinding depends on the coefficient of friction beteen the yarn and package. Current friction measurement techniques do not have the high speed and package surface roughness characteristics of yarn-package firiction. This research develops a new measruement technique for yarn-package friction that used simultaneously captured tension data and images of the yarn slidingonthepackage surface during actaul unwinding. An algorithm combines a mathematical model of the sliding motion with experimental data to produce estimates of the yarn/package coefficient of friction. Parkages of equivalent denier, textured and fully drawn polyester yarns are tested with a mesurement uncertainty of less than 10. The coefficients of firiction increase from 0.40 to 0.48 and 0.23 to 0.35 over the speed range of 500 to 1000 m/min for the testured and fully drawn yarns, respectively. A simpler measurement method with an Instron tensile tester can be used for comparative coefficient of friction measurements, but it provides quantitative ageement with the in-situ measurements only at low tension.
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机译：过度退绕时退回张力的大小和无缺取决于纱线和卷装之间的摩擦系数。当前的摩擦测量技术不具有纱线卷装燃烧的高速和卷装表面粗糙度特性。这项研究开发了一种用于卷装摩擦的新测量技术，该技术同时使用了捕获的张力数据和在实际退绕过程中在卷装表面滑动的纱线的图像。一种算法将滑动运动的数学模型与实验数据结合起来，以得出纱线/卷装摩擦系数的估计值。测试了等效旦尼尔，变形和完全拉伸聚酯纱线的停车位，其测量不确定度小于10。在500至1000 m / min的速度范围内，燃烧系数从0.40增加到0.48，从0.23增加到0.35，并且完全拉伸的纱线。使用Instron拉伸测试仪的一种更简单的测量方法可以用于比较摩擦系数的测量，但是仅在低张力下使用现场测量才能提供定量的老化。
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