Influence of annealing on the properties of air-jet and ring yarns

215-218The influence of heat treatment or annealing under tensioned and relaxed conditions on the properties of air-jet and ring yarns has been studied. Slack annealing reduces the flexural rigidity of air-jet yarn at the cost of tenacity. Tension annealing though increases tenacity, makes the yarn very stiff by enhancing flexural rigidity. Abrasion resistance and recovery properties have been found to improve with slack and tension annealing respectively