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Title: Method and apparatus for imparting false twist to yarn before ring spinning
Other Titles: 在环锭纺纱之前对纱线施加假捻的方法及装置
Authors: Tao, X 
Xu, BG 
Hua, T 
Feng, J 
Guo, H 
Jia, Y 
Issue Date: 30-Nov-2016
Source: 中国专利 ZL 201310091686.5 How to cite?
Abstract: The invention discloses a method and apparatus for imparting false twist to a yarn before ring spinning, and a ring spinning machine comprising the apparatus. Downstream of a nip, the twisted yarn is drawn sequentially across first and second runs of travelling endless belts, such that the yarn wraps about a first convex surface of the first run, then passes between the first and second runs, before wrapping about a second convex surface of the second run. Friction between each of the first and second convex surfaces and the yarn imparts the false twist in a common direction. Maintaining a differential between first and second linear speeds of the first and second runs, respectively, has been found to reduce yarn defects, particularly the nep count.
Rights: Assignee: The Hong Kong Polytechnic University
Appears in Collections:Patent

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