Material Metric
Percentage of cotton fibers by weight or number that are shorter than a specific threshold represents a major quality limitation in raw cotton bales. The short fibre content gives a reliable indication of how much waste the yarn mill will generate. This measurement is monitored closely because shorter fibers cannot be controlled effectively by the drafting rollers.
Processing Behavior
Fibers that fall below the critical length limits tend to float in the drafting zone, causing sudden mass variations in the roving and sliver. This unstable movement creates thick and thin spots in the yarn, leading to high break rates during winding and spinning. Factories run their machines slower when processing cotton with high levels of short fibers to prevent excessive downtime.
Yarn Integrity
The presence of short fibers reduces the number of fiber-to-fiber contact points within the yarn core, lowering the overall tensile strength. High twist must be applied to bind these loose ends, which increases yarn stiffness and reduces productivity on the knitting machines. If the yarn lacks sufficient strength, it will fail during subsequent high-speed weaving operations.
Waste Generation
Combing is the main process used to extract short fibers and raise the average fiber length. High initial short fiber levels force the mill to increase the comber waste percentage to maintain the required yarn specifications. This extraction increases the raw material cost because more cotton must be purchased to produce the same quantity of combed yarn.
Mills can minimize this cost by utilizing the extracted noils in coarser rotor-spun yarns or selling them to industrial non-woven manufacturers.
