Influence of Rotational Direction of Air Vortex and Winding Speed on Hairiness of Yarn in Cone Winding with Air Jet Attachment

摘要

With the objective of studying the effect of rotational direction of air vortex and winding speed on hairiness of yarn, two types air jet nozzles differing in the direction of inclination of orifices and suitable for air jet assembly in cone winding have been designed and fabricated. The cotton yarn passing through the air jet nozzle has been subjected to the air vortex of compressed air, administered into the nozzle. Depending upon its rotational direction, the air vortex either tucks and binds or wraps the protruding fibres. The performance of these two types of nozzle has been evaluated in terms of reduction in hairiness and improvement in other properties of 30K yarn round at threespeeds of 15 m/min, 250 m/min and 550 m/min under three different air pressures of 0.5 bar, 1.0 bar and 1.5 bar. It has been observed that both the types of nozzle contribute to hairiness reduction. At lower speed, the nozzle creating air vortex in the direction same as that of yarn twist performs slightly better, but at higherspeeds, the nozzle creating air vortex in the direction opposite to that of yarn twist performs better. Further, it has been observed that the hairiness reduction decreases with the increasing winding speed It is also noticed that there is a reduction in the imperfection level.