Can Rotor Spinning Produce Yarns of Fine Count?
As indicated earlier, rotor spinning has superior economical advantage over ring spinning in the coarse to medium counts. In recent years, there have been many attempts to push rotor spinning further into the area of fine counts When we speak of fine counts, we generally mean yarns of maximum 40 s cotton count. In order to produce fine yarn counts on rotor spinning, two main factors must be addressed: (a) machine-related factors, and (b) material-related factors. Examining the spinning tension of rotor spinning may summarize the machine-related factor. This is the tension on the yarn, Ty, delivered from the rotor expressed by the following equation: Where v is the rotor rotational speed in radians/sec, r is the rotor radius, and m is the coefficient of friction between the yarn and the navel surface in contact with the yarn. The above equation indicates that the spinning tension is highly sensitive to the rotational speed of the rotor and the radius. The product vr is a primary design
