Influence of Twist on Selected Properties of Multifilament Yarn

Iva Mertová 1 , Eva Moučková 1 , Bohuslav Neckář 1 , and Monika Vyšanská 1
  • 1 Technical University of Liberec, Faculty of Textile Engineering, Department of Technologies and Structures, Liberec, Studentská 2, 461 17 , Liberec , Czech Republic


Owing to twisting of filament fiber bundle, the structure and consequently various parameters and properties of a fiber bundle are changed. The aim of the work is to verify the effect of multifilament yarn twist (or twist coefficient) on selected mechanical properties such as multifilament tenacity, breaking elongation, and coefficient of fiber stress utilization in the yarn. Furthermore, the influence of twist on structural parameters such as the angle of peripheral fibers, the packing density, and the substance cross-sectional area of fiber bundle is observed. Two multifilament yarns with different filament cross-section shape and material were used for the experiment. Experimentally obtained data was compared with the known model dependencies derived decades ago based on the helical model. It can be stated that multifilament yarn retraction can be predicted based on the angle of peripheral fibers using the Braschler’s model. The coefficient of fiber stress utilization in the multifilament yarn determined experimentally corresponds with a theoretical curve, constructed according to Gégauff and Neckář, in the area of Koechlin’s twist coefficient α > 54 ktex1/2 m−1. Results as well as possible causes of deviations of experimental data from the theoretical one are discussed in this work.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] Ursíny, P. (1984). Machines and Technology of Spinning - in Czech. VŠST Liberec (Liberec).

  • [2] Neckář, B. (1990). Yarn - Forming, structure and properties. SNTL Prague (Prague).

  • [3] Hearle, J. W. S., Grosberg, P. and Backer, S. (1969). Structural Mechanics of Fibers, Yarns and Fabrics. Wiley- Interscience (New York).

  • [4] Gegauff, M. C. (1907). Strength and elasticity of cotton threads. Bulletin de la Société Industrielle de Mulhouse, 77, pp. 153 -176.

  • [5] Neckář, B., Das, D. (2012). Theory of structure and mechanics of fiber assemblies. (1 edition). Woodhead Publishing India (New Delhi).

  • [6] Jones, J. E. Haddad, G. N. and Sutton, J.N. (1971). Tensile Characteristics of Twisted Continuous-Filament Glass Yarns. Textile Research Journal. Vol. 41, Issue 11, pp. 900- 904.

  • [7] Kilby, W. F. (1964). The Mechanical Properties of Twisted Continuous Filament Yarns. The Journal of the Textile Institute, Volume 55, Issue 12, pp. T589-T632.

  • [8] Treloar, L. R. G. and Riding, G. A. (1963). Theory of Stress-Strain Properties of Continuous-Filament Yarns. The Journal of the Textile Institute, Volume 54, Issue 4, pp.T156-T170.

  • [9] Internal Standard No. 46-108-01/01 Recommended procedure for preparation of samples. Soft and hard sections (slices).Technical University of Liberec, Faculty of Textile Engineering, Textile Research Center.

  • [10] Neckar, B. (2014). Weaves Structure and Properties. Lectures. Retrieved June, 25, 2016. Web site:

  • [11] Das, D. (2005). Yarn strength as a stochastic process. Dissertation work. Technical University of Liberec (Liberec).

  • [12] Neckar, B., Das, D. (2016): Tensile behavior of staple fiber yarns part I: theoretical models. The Journal of the Textile Institute, DOI: 10.1080/00405000.2016.1204899.

  • [13] Meloun, M., Militky, J. (1994): Statistical treatment of experimental data. PLUS, s.r.o. (Prague)


Journal + Issues