Analysis of spinning process using the Taguchi method. Part II: Effect of spinning process variables on fibre extent and fibre overlap in ring, rotor and air-jet yarns

The fibre orientation in 24s Ne ring, rotor and air-jet yarns has been studied using tracer fibre technique. The effect of drafts at different stages of spinning process on fibre orientation in different yarns has been analyzed using Taguchi Method and analysis of variance. The fibre orientation was studied in terms of fibre extent (FE) and two newly defined indices (FOIs), fibre-overlap index (FOI) and fibre-pair-overlap length (FPO). Ring yarn is seen to have the highest FE and FOIs and rotor yarn the least. A medium card draft (101 or 114) and a corresponding ring or speed frame draft give the highest FE. The effect of fibre parallelization in finisher sliver is retained in respect of FE and FOIs in rotor and air-Jet yarns. The effect of fibre parallelization in rovings is manifested on FOI of ring yarns. A higher card draft and correspondingly lower air-Jet draft give higher FE and FOIs.