Investigating the co-effect of twist and hot drawing processes on the bio-based yarns properties

Abstract

Biodegradable fibres made from branched polymer grade were spun, hot drawn and twisted. To model the process parameters’ effect, samples had been characterised and analysed under a fractional factorial design method as functions of the process parameters using statistical methods. Drawing ratio, drawing temperature and the number of drawing stages had a positive effect on thermal shrinkage, tenacity and modulus and had a negative effect on elongation at break. The drawing stage had a negative effect on abrasion positively affected by the drawing ratio. With a one-stage drawing process, the tension was very high, and then the spin finish played an important role in the filament slippage on the last roller after the applied spin finish. Twist values did not have a significant effect on thermal shrinkage value itself; twist affected negatively on modulus and positively on abrasion of drawn biodegradable yarn. Results and statistical analysis indicated combinations of factor levels which controlled the production processes of environmentally friendly biodegradable textiles to suit different purposes.