Relationship between Surging Phenomenon and Processing Conditions in False Twisting

Surging in the false-twisting machine degrades yarn quality. Surging is a yarn vibration phenomenon, and its cause has not been clarified. It is an important issue to clarify the causes of surging from the viewpoint of the textile industry. Investigating the causes of surging contributes to not only higher processing speed but also higher processing efficiency. This investigation also contributes to stabilizing the yarn quality at the false-twisting production site. In this study, a disc-friction type model machine was used to evaluate the yarn conditions of false twisting with and without surging. It was observed that surging tends to occur at low drawing ratios and high-speed processing. In the addon twisting area, the number of twists, drawing quantity, yarn tension, yarn temperature, and heating time decreased because of the occurrence of surging. These results show the actual condition of the yarns with surging and confirm the interrelationship between surging and processing conditions of false twisting.