This paper presents a mechanical model in which dynamic equilibriums of forces and moments are considered. This model is able to quantitatively describe twist distribution in the frictional contact zone inside a rotor in terms of yam, machine, and operational parameters. Four cases of the application of this model are discussed. Three terms—the deviate angle, yarn tension, and yarn twist blockage—are given as functions of the wrap angle, contact surface factor, torsional factor, and rotary speed factor.
Get full access to this article
View all access options for this article.
References
1.
Barr, D., and Catling, H., Twist Insertion in Ring Spinning and Doubling, J. Textile Inst.50, T239-240 (1959).
2.
Chen, R., and Zhang, S., The Yarn Wrapping Curve on Torus Surface and Its Tension Variation During Sliding, J. China Textile Univ. (2), 56 (1987).
3.
Cormack, D., Grosberg, P., and Ho, K., TheYarn Twist Inside the Rotor in Open-end Spinning, J. Textile Inst.70 (9), 380 (1979).
4.
Denton, M.J. , Tension Ratio and Slip in Friction-twisting . J. Textile Inst.66 (8), 303-306 (1975).
5.
Du, G., and Hearle, J.W.S., Threadline Instability in the False-twist Texturing Process, Part I: Experimental Observations of Tension Surging, and Part II: The Influence of Process Parameters on Threadline Instability. J. Textile Inst.80 (2), 203-224 (1989).
6.
Du, G., and Hearle, J.W.S., Threadline Instability in the False-twist Texturing Process, Part III: Stability of the Yarn Path and Surging Mechanisms, J. Textile Inst.81 (1), 36-47 (1990).
7.
Fraser, W.B. , Stump, D.M., Yarn Twist in the Ring-spinning Balloon , Proc. R. Soc.Lon. 454, 707-723 (1998).
8.
Grosberg, P. , Oxenham, W., and Miao, M., TheInsertion of Twist into Yam by Means of Air-jets . J. Textile Inst.78 (3), 204-219 (1987).
9.
Johann, Method of Measuring the Pitch Angle of Yarn Provided with a Twist, U.S. patent 606,242, 1975.
