Effect of Rotor Speed on Open-End Spinning and Yarn Properties

Abstract

The effects of rotor speed (417 to 1000 rev/s) on yarn quality were investigated. The following parameters were also varied: rotor diameter and configuration, card type, cotton-fiber properties, and type of takeoff navels. The strength of a 49 mg/m yarn increased as rotor speed increased to 667 rev/s, and then decreased, whereas the strength of 25 mg/m yarn decreased with increased rotor speed. A latively fine, strong-fibered cotton was necessary for spinning at high rotor speeds. However, the difference in strength between yarns from a carded cotton and yarns from a combed cotton was less at high rotor speeds, evidently as a result of more wrappers and greater fiber breakage with longer fibers. Any factor that increased the twisting torque to the yarn-formation point in the rotor, such as large-diameter rotors, fast rotor speeds, and grooves in the takeoff navel, produced yarns with poorer fiber orientation and short-term uniformity. Also, high rotor speeds reduced the fiber parallelazation of the fiber ring in the rotor.