Impact of Plying on the Physical Properties of Vortex and Other Spun Yarns

The physical properties of two ply yarns made from vortex, ring, compact, and rotor singles have been investigated by changing ply twist factor. The physical parameters like yarn diameter, plied yarn length, twist liveliness have been found to be significantly affected by the ply twist factor. Though plying increases the yarn diameter for all, the percentage increase in diameter with respect to single yarn is the minimum for vortex yarns. The ply twist factor at which the real contraction starts is also the lowest for vortex yarns. Amongst the plied yarns, those made from rotor yarns show minimum twist liveliness. A minimum ply twist threshold exists below which hockles (a hole like structure) in ply yarns are observed.