Staple Length against Pilling Life in a Combed Cotton Order
Combing long-staple cotton to eighteen percent noil suppresses short fibers below six percent, locking ends into yarn cores to secure Grade 4 pilling life.
Hairiness Index
Fibre Deviation
Optical measurement defines the length and count of protruding fibres perpendicular to the main axis of a spun yarn. This hairiness index identifies the degree of surface disturbance created during the spinning process as individual filaments escape the core structure. Manufacturers record this data during final yarn quality control stages to predict downstream fabric performance.
High counts suggest potential pilling risks during garment wear.
Detection Mechanism
Laser sensors scan the yarn profile as it travels at constant velocity through a calibrated testing zone. Sensors detect shadows cast by protruding ends while the software calculates the deviation from the central yarn body. Photodiode arrays convert these interruptions into a quantitative value represented by the hairiness index.
Precise alignment of the yarn path remains mandatory to prevent signal noise from influencing the final output.
Production Outcome
Variations in draft settings or traveller speed directly influence the fibre projection density on the yarn exterior. Low values indicate a smooth finish suitable for high-twist weaving where surface friction requires control. Excess projection causes snagging on loom components during the shedding phase of fabric construction.
Finished goods made from yarn with a higher rating display a softer hand but trade this against a greater tendency for fuzz formation.
Verification Standard
Quality agreements between suppliers and mills utilize this metric to verify batch consistency across large production runs. Standards define the length thresholds where a protruding fibre counts toward the total. Labs report the average result along with the coefficient of variation to determine if a lot satisfies the technical requirement for specific knitting or weaving applications.
Consistent control over this numerical output determines the commercial acceptability of industrial yarn shipments.
Cotton Fiber Length Distribution Metrics and Carded Yarn Quality
AFIS short fiber content by weight in raw cotton must remain below 8.5 percent to prevent severe mass variance and tenacity drop in carded yarn spinning.