Investigation of fiber trajectory affected by some parameter variables in vortex spun yarn

Abstract

The principle and process of yarn formation determines fiber trajectory in a yarn. The objective of this paper was to investigate the effect of some parameter variables on the fiber trajectory of vortex spun yarn produced by the MVS No. 861 spinner, based on tracer fiber and image mosaics techniques. Some typical fiber configurations in vortex spun yarn were also observed. It was found that fiber trajectories in vortex spun yarn are affected significantly by the following parameters: fiber specification, distance between the front roller nip point and the tip of the hollow spindle, nozzle pressure, and yarn delivery speed, as well as yarn linear density. Some typical fiber configurations of vortex spun yarn include straight, ideal trajectory, hooked (trailing, leading, and both ends), looped, and entangled. Increasing the fiber length or decreasing the distance between the front roller nip point and the tip of the hollow spindle will result in an increase of the core fiber length in vortex spun yarn. The mean pitch of wrapper fiber decreases with the decrease of fiber fineness and yarn delivery speed, while its mean wrapper angle takes on an inverse trend affected by fiber fineness and yarn delivery speed. The mean pitch of wrapper fiber increases with decreasing nozzle pressure and yarn linear density, while its wrapper angle is smaller when nozzle pressure is lower and vortex spun yarn is coarser.