The Hong Kong Polytechnic University

Jie Feng

Bingang Xu

Tao Hua

Xiaoming Tao

Bin Xu

Xiao Ming Tao

Heng Guo

Yunhui Jia

A yarn twisting method and device for a ring spinning machine is provided. The twisting method comprises the following steps: feeding three roving strands () into a back roller () of the ring spinning machine; after drafting, the three roving strands, three fiber strands () exiting from a nip point of a front roller (), wherein a fiber strand () in the middle forms an angle with a plane formed by the other two fiber strands (), and thus the three fiber strands () form a multi-strand spinning triangle region having a three-dimensional spatial form; and in the multi-strand spinning triangle region, the three fiber strands () obtaining twist by means of a ring traveler of the ring spinning machine, and the twisted fiber strands () are combined into a composite yarn () through a convergence point.

Yarn twisting method and device for ring-spinning machine

A method and apparatus for imparting false twist to a short staple yarn delivered from a nip of a pair of front drafting rollers before ring spinning. Downstream of the 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.

Method and apparatus for imparting false twist to yarn before ring spinning

Method and apparatus for reducing residual torque in singles ring yarns, achieved by imparting two separate false twisting points on the traveling strand of fibers (or yarn) after the strand exits from the spinning triangle with a proper ratio between the belt speed and the strand feeding speed. In addition to reducing the residual torque, this double false twist technique also reduces yarn hairiness to the same level as achieved by more expensive compact spinning devices, reduces yarn twist by more than 20% and significantly enhances yarn and fabric softness. Furthermore, by combining the double false twist technique with a compact spinning device, the numbers of neps, thick and thin places are significantly reduced to produce high-quality yarns and fine-count yarns.

Method and apparatus for reducing residual torque and neps in singles ring yarns

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Hong Kong, China

Jie Feng