Threadline Instability in the False-twist Texturing Process Part I: Experimental Observations of Tension Surging

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Abstract
A study of tension surging and of the properties of the resultant yarns is reported. Tension profiles are discussed and assigned to three modes of operation, namely, pre-surging, surging, and post-surging. The critical conditions for these three modes and the wavelengths and amplitude of tension surging are investigated. The insertion of twist is examined, and it is shown that, not only is the surging mode unstable, hut there is also a higher-frequency instability in the post-surging mode. On the basis of the results obtained from routine tests for textured yarns, it is confirmed that the quality of the yarns resulting from both surging and post-surging modes is not acceptable.

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