Features of cotton and viscose vortex yarns directly spun from card slivers

Abstract

In this study, the possibility of manufacturing vortex yarns directly from card slivers having two different sliver counts is investigated. The fiber type, card sliver count, and yarn count are considered as the selected parameters to be examined due to their effects on unevenness, yarn imperfections, hairiness, breaking strength, and elongation properties. For this purpose, cotton and viscose yarns in three yarn counts, 14.77, 19.69, and 29.53 tex, were produced from two card sliver counts (3.58 and 4.92 ktex) by a Murata Vortex Spinning (MVS) system. The study revealed that vortex yarns can be produced by feeding directly card slivers to the MVS system, and resulting yarns have features compatible with those yarns produced on a conventional production line. In the context of this study, where the drafting process is eliminated, it is recommended to produce yarns from fine card slivers to reach a lower CVm% and imperfection value and to produce yarns by coarser card slivers to reach lower hairiness and higher Rkm values.

Effects of structural parameters on air consumption and mechanical energy characteristics of airflow in the vortex spinning nozzle

“…Under the action of the swirling airflow, the drafted fiber bundle is sucked into the nozzle through the fiber guiding element, and is then twisted into a yarn with a layered structure consisting of twistless fibers in the core wrapped by helical wrapper fibers in the sheath. 3,4 Furthermore, swirling airflows are also widely adopted in many other industrial applications, such as enhancing the mixing between fuel and oxidant in combustion systems, 5 separating particles in cyclones, 6 and improving the coefficient of performance in cooling systems. 7 However, there exist complex phenomena in swirling flows such as vortices and shear effects, which can affect the efficiency of the industrial production.…”