Effect of bypass channel on rotor-spun yarn properties in rotor spinning

Abstract

In order to reduce or eliminate the vortices generated at the transport channel inlet so as to decrease its adverse effect on fiber configuration, a bypass channel located on the extension of the long side of the transport channel was introduced as an air supply channel. The numerical simulation method was adopted to study the airflow dynamics of the modified transport channel. Combining with the spinning tests and fiber configuration tests, the effectiveness of the bypass channel in improving the airflow field and rotor spun-yarn properties was evaluated. The results show that by adopting the bypass channel, the vortices generated at the transport channel can be eliminated, and the air velocity in fiber separation area is increased, thus increasing the fiber peeling-drawing ratio. The rotor spinning machine with the bypass channel has a positive effect on improving the yarn tenacities as well as decreasing the number of hook fibers in the rotor groove. This indicates that eliminating the vortices and increasing the fiber peeling-drawing ratio are beneficial to fiber morphology, thus improving the yarn fracture strength.