Quantitative Impact of Short Fiber Content on Combed Cotton Rotor Yarn Tenacity Limits
Combing cotton sliver below 5.5% short fiber content raises rotor yarn tenacity ceilings to 18.5 cN/tex by reducing friction slip inside the rotor groove.
Rotor Groove
Spinning Zone
Internal peripheral channels collect and consolidate individual fibers within an open-end spinning machine. The design of the rotor groove determines the compactness and cross-sectional shape of the assembled yarn before twist insertion. This groove is located at the widest internal diameter of the rotor.
Yarn Twist
Centrifugal force presses the incoming fibers into the narrow channel to form a continuous fiber ring. As the yarn is drawn out, it peels from the rotor groove while twist is inserted by the rotation of the rotor.
Fiber Collection
Uniform fiber distribution along the channel is required to prevent periodic mass variations in the spun yarn. If the rotor groove becomes clogged with dust or oligomers, the fibers cannot assemble evenly, which leads to weak spots in the yarn. This necessitates regular rotor cleaning.
Structural Shape
Cross-sectional geometries of the channel, such as V-shapes or U-shapes, directly influence the physical characteristics of the resulting yarn. Choosing a narrow rotor groove produces a highly compact yarn with high abrasion resistance but lower bulk, whereas a wider channel yields a softer yarn suitable for knitting. Technicians select the groove profile based on the desired characteristics of the finished textile product.