STUDIES OF JETRING SPINNING .1. REDUCING YARN HAIRINESS WITH THE JETRING

This paper introduces the concept of JetRing spinning, a new spinning technique that incorporates features of both ring and air-jet spinning systems. In JetRing spinning, a single air jet is used below the yam- forming zone of a conventional ring spinning system; this jet acts in a way similar to the first jet in air-jet spinning. The swirling air c urrents in the jet wind the protruding fibers around the yarn body, th us reducing yarn hairiness. The air pressure applied to the jet in thi s study is 0.5 bar, which is much lower than the air pressure used in air-jet spinning. To evaluate the performance of JetRing spinning, rin g spun and JetRing spun worsted yarns of 56 tex are tested for hairine ss, tensile properties, and yam evenness. The hairiness results from t he Zweigle hairiness meter show that the JetRing spun yarn has much lo wer numbers of hairs than the ring spun yam in almost all the hair len gth groups. The total number of hairs exceeding 3 mm (i.e., the S3 val ue) for the JetRing spun yarn is nearly 40% less than that of the ring spun yarn, while both yam types show little difference in evenness an d tensile properties.