Air-Jet Spinning Process Parameters

Critical parameters: air pressure (4-6 bar, higher pressure = more wrapper fibres, tighter structure, lower hairiness but higher air consumption 15-25 L/nozzle/min compressed air), nozzle design (hollow spindle diameter 2-4 mm, air jet angle/number/position affecting vortex strength and geometry), delivery speed (300-500 m/min depending on count, finer counts slower), drafting system settings (similar to ring—break draft 1.3-1.5×, main draft 15-30×), and fibre guide geometry (between drafting and nozzle affecting fibre presentation to vortex). Twist equivalent: not true twist but 'wrapper turns per meter' 600-1200 WPM typical, creating twist-like effect. Nozzle wear: critical maintenance item (8,000-15,000 hours life) affecting air flow pattern and yarn quality requiring periodic replacement.