Fibre Alignment
Ring spun combed cotton yarn begins with staple cotton that passes through a specialized mechanical comb to eliminate short fibres and align parallel structures prior to drafting and twisting. Mechanical carding leaves a random web of short and long fibres containing residual trash particles. Passing this web through a combing machine extracts fibres below a specific length threshold, typically set between twelve and fifteen millimetres depending on the target count.
Mill operators measure the noil percentage, which is the weight ratio of waste extracted during this process relative to the total input mass. Higher noil extraction rates yield cleaner configurations with superior uniformity, though raw material costs rise accordingly because the short fibre waste sells at a heavily discounted rate.
Twist Multiplier
Spinning mills apply a calculated twist factor to consolidate the aligned parallel staple mass into a cohesive structural strand. Twist level determines the balance between tensile strength and fabric drape in the subsequent weaving or knitting stages. Low twist levels produce a softer hand feel but reduce tensile strength, causing yarn breakage during high speed industrial loom operations.
High twist configurations increase structural resistance against mechanical stress and reduce hairiness, yet they introduce torque that causes skewed courses in knitted garments or twisted seams in washed woven shirts. Quality control laboratories measure twist per inch using specialized tension meters and compare the recorded values against buyer specifications before approving a lot for dyeing.
Hairiness Index
Post spinning evaluation relies on optical sensors to measure surface protruding fibres projecting outward from the main yarn body. Protruding ends scatter light during processing and cause pills to form on the surface of finished knitted fabrics during consumer wear. Combing removes the loose ends that otherwise create high hairiness values during conventional carded production runs.
Low hairiness improves print definition in rotary screen printing and reduces lint accumulation on knitting machine needles during prolonged operating shifts. Fabric buyers set strict maximum thresholds for the hairiness index in purchase contracts, rejecting batches that exceed the agreed limit because excessive protruding ends ruin the hand feel of mercerized garments.
Cleanliness Grade
Visual inspection under standardized lighting detects residual trash, neps, and foreign matter trapped within the spun structure during the opening and cleaning stages. Neps are microscopic knots of entangled cotton fibres created by harsh mechanical handling during harvesting or early ginning. Advanced optical clearing units on modern winders detect these defects and excise them, splicing the clean ends back together automatically before packaging the yarn onto cones.
Premium apparel applications demand zero tolerance for neps because dye uptake varies in entangled spots, creating visible specks in dyed fabrics. Laboratory technicians grade the cleaned lots against photographic standards to verify that foreign matter contamination remains within acceptable limits for high end shirting and luxury bed linen production.
