Air-Jet Spinning Quality Control

Quality monitoring: integrated online monitoring (evenness, mass variation, thick/thin places measured continuously via optical or capacitive sensors on each nozzle position), automatic nozzle stop for excessive variation (CV% >threshold, defect rate >limit), periodic Uster testing (comprehensive yarn quality benchmarking), and appearance grading (wrapper periodicity, hairiness, surface uniformity). Critical control points: air pressure consistency (pressure variation ±0.1 bar can affect wrapper structure—centralized compressor with regulation system ensuring ±0.05 bar), nozzle condition monitoring (air flow rate measurement, nozzle bore inspection—wear causes irregular wrapper), sliver quality (input CV% directly affects output, neps/trash causing defects as no rotor trash removal), and environmental control (temperature 22-26°C, RH 50-60% optimal for stable processing). Maintenance: nozzle cleaning every 40-80 hours (removing fibre/dust accumulation), nozzle replacement 8,000-15,000 hours, compressed air filtration (preventing nozzle contamination).