Development of an instrument to study shrinkage properties of air-jet textured yarns

Abstract

An instrument has been fabricated to study the shrinkage behaviour of yarns. The effect of various process parameters, namely speed, overfeed and air pressure, on the shrinkage behaviour of air-jet textured polyester yarns has been investigated. Samples were prepared using factorial design for three variables and then tested for shrinkage, bulk and instability. Three response surface equations were calculated for shrinkage, bulk and instability in terms of process parameters. The results show that the shrinkage value decreases with the increase in overfeed, air pressure and speed. The use of water during the air-jet texturing process is found to increase the shrinkage in the resultant air-jet textured yarns.