Dynamic friction of polyester air-jet textured yarns

In this paper, friction of air-jet textured yams is investigated. Using a friction measuring apparatus fabricated in-house, dynamic friction forces of the yarns under yam-to-metal (YM) and yam-to-yarn (YY) rubbing modes are measured. The influence of processing variables of air-jet texturing viz., overfeed, air pressure, dry/wet texturing and normal/core-and-effect texturing on dynamic friction is analysed. The results indicate that friction force increases with increasing rubbing speeds and yam input tension. YM dynamic friction decreases initially and then starts to increase at higher overfeeds. YY dynamic friction increases with increasing overfeed. YM dynamic friction decreases with an increase in air pressure while an opposite trend is observed for YY friction. Wet textured yarns have higher friction than dry textured yams. Core wetted core-and-effect textured yams have higher friction than normal textured yarns.