Theoretical study of fiber tension distributions at the twist point
International Journal of Clothing Science and Technology
ISSN: 0955-6222
Article publication date: 1 June 2015
Abstract
Purpose
Spinning triangle is a critical region in the spinning process of staple yarn, which geometry influences the distribution of fiber tension and determines the qualities of yarn directly. Therefore, the purpose of this paper is to investigate the fiber tension distribution at the twist point.
Design/methodology/approach
First, one theoretical model of fiber tension distributions at the twist point is given according to the motion law of fibers in the spinning triangle. Then, one calculation method of fiber tension at the twist point is given by two steps. First, the initial tension of each fiber at the front nip line caused by the yarn load should be calculated according to the models obtained based on the principle of minimum potential energy. Second, the fiber tensions at the twist point can be calculated using the obtained model in this paper. Finally, as an application of the proposed method, spinning triangles of a modified ring spinning system with a pair of offset device which can change the horizontal offset of the twist point to the symmetric axis of nip line of the spinning triangle continuously are studied. The fiber tension distributions are simulated numerically.
Findings
It is shown that the fiber tension distributions at the twist point can be determined by fiber feeding into and out the spinning triangle speed, the initial tension of each fiber at the front nip line, fiber tensile Young’s modulus and cross-sectional area, the number of fibers at spinning triangle and the individual fiber angle with the center fiber. The spinning experiment shows that taking appropriate right or left offset of the spinning triangle can help to improve the spun yarn qualities.
Originality/value
In this paper, the fiber tension distribution at the twist point is investigated. One theoretical model of fiber tension distributions at the twist point is given according to the motion law of fibers in the spinning triangle first. Then, one calculation method of fiber tension at the twist point has been given under the assumption that the initial tension of each fiber at the front nip line is caused by the yarn load.
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of P.R. China under Grant No. 11102072, the Natural Science Foundation of Jiangsu Province under Grant No. BK2012254, Prospective industry-university-research project of Jiangsu Province No. BY2012065, the Fundamental Research Funds for the Central Universities (No. JUSRP51301A), and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Citation
Liu, X., Su, X. and Zhang, H. (2015), "Theoretical study of fiber tension distributions at the twist point", International Journal of Clothing Science and Technology, Vol. 27 No. 3, pp. 344-357. https://doi.org/10.1108/IJCST-01-2014-0016
Publisher
:Emerald Group Publishing Limited
Copyright © 2015, Emerald Group Publishing Limited