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.
Draw Frame Sliver
Intermediate Product
Fiber assembly formed by the attenuation and doubling of several carded slivers provides the uniform mass required for subsequent spinning operations. Mill equipment uses two stages of drawing to align the filaments in a parallel arrangement and to blend different fiber types. This draw frame sliver represents the final state of the material before it is reduced to a roving or a yarn.
Blending Action
Multiple strands of carded material are fed into the machine to average out the variations in weight per meter. This process reduces the overall irregularity and ensures that any inconsistencies from the carding stage are minimized. Precise control of the draw frame sliver weight is a primary requirement for maintaining the correct yarn count in the spinning room.
Parallel Alignment
Drafting rollers moving at different speeds pull the fibers forward to straighten them and remove hooks. This mechanical action increases the cohesion of the strand and improves the efficiency of the next processing stage. Improved fiber orientation in the sliver leads to a stronger and more lustrous yarn in the final product.
Processing Stage
Quality verification involves regular testing of the sliver for mass variation and thick places. Technicians use capacitance sensors to monitor the output and ensure the drafting system is functioning correctly. Any deviation in the draw frame sliver quality will be amplified in the finished yarn and cannot be corrected later.