Influence of add-on spin finish and some process parameters on elastic recovery properties of polyester OE rotor-spun yarns

Abstract

The influence of add-on spin finish and opening roller speed on the recovery properties of polyester OE rotor yarns spun from polyester fibres of different cross-sectional shapes and linear densities has been studied.  The level of add-on finish appears to have highest influence on the recovery characteristics followed by the fibre linear density and opening roller speed.  Higher level of add-on finish offers significant advantages in respect of immediate elastic recovery and delayed elastic recovery but adversely affects the permanent set. Reduced fibre linear density also has a potential for an appreciable increase in immediate elastic recovery and delayed elastic recovery. Lower opening roller speed is important for lower permanent set as well as higher immediately elastic recovery and delayed elastic recovery. Neither there are appreciable changes in immediate elastic recovery, nor are there significant differences in permanent set with the change in fibre profile. Change in amplitude and rate of extension also provides noticeable variations in the elastic recovery properties; the magnitude depends mainly on the processing parameters