High speed yarn production with air-jet spinning: Effects of some fiber parameters

This work is aimed at improving the quality of air-jet polyester/cotton blended yarns spun at a high delivery speed (285 m/min) and the fabrics produced from them. Short (28 mm) and fine (1.0 d) polyester fibers and combed cotton are used in an attempt to improve yarn strength and evenness. The possibility of increasing delivery speed when fine denier polyester is used is also investigated. Whereas fine polyester and combed cotton improve yarn strength, evenness, and imperfection level, short polyester fibers do not improve yarn evenness. Long polyester fibers improve a yarn's strength but lower its elongation, making it stiffer. Long, coarser polyester fibers and combed cotton lead to a higher number of long hairs. Fine polyester fibers increase the delivery speed without significant loss in yarn strength and evenness, but with a considerable deterioration in the yarn imperfection level and hairiness. Fabric abrasion resistance is higher for longer polyester and combed cotton fibers. While none of the variables influences fabric pilling resistance and compressional resilience, shorter polyester and carded cotton fibers promote higher compressional energy and reduce fabric thickness.