Threadline Instability in the False-twist Texturing Process Part III: Stability of the Yarn Path and Surging Mechanisms

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Abstract
An investigation is reported in which the motion of the yam path on twister surfaces in the surging and post-surging modes was examined by means of high-speed photography. Two types of tension surging, namely, mild and severe surging, are distinguished by the phase difference in yarn tension and yam rotational speed. The photographic results also show that the yarn path in the post-surging mode is always unstable. Finally, based on the experimental work reported in this series of papers and a theoretical analysis that will be published elsewhere, a discussion on the mechanism of threadline instability is given.