Air-Jet Spinning Principle and Mechanism

Air-jet spinning (specifically Murata Vortex Spinning MVS dominant technology): (1) drafting—conventional 4-over-4 drafting system with total draft 20-40× converting sliver to required fineness, (2) fibre separation—air nozzle (hollow spindle) with tangential compressed air jets (4-6 bar pressure) creating swirling vortex separating core fibres (60-70%, remain relatively straight, low twist) from peripheral fibres (30-40%, caught in vortex), (3) twisting—vortex rotation (200,000-400,000 rpm equivalent) wrapping peripheral fibres helically around core at 60-80° angle creating fasciated structure, (4) delivery—yarn continuously withdrawn at 300-500 m/min. False-twist principle: twist exists only in twisting zone (spindle), yarn downstream essentially untwisted core with wrapped sheath providing cohesion without true twist propagation.