Suction and Pneumatic Fibre Removal
topic
Centralised suction systems remove fly, short fibres, and broken ends from the drafting zone through suction hoods positioned above the back and middle rollers, operating at 800–1200 Pa static pressure and 0.5–1.0 m/s air velocity at the hood inlet. Pneumatic end-down collectors at front rollers prevent broken end wrapping. Suction efficiency is measured by fly accumulation rate on rollers (mg/1000 spindle hours).
Role
Suction system performance directly determines both yarn quality and machine availability. Poor suction causes fly to accumulate on rollers and aprons, degrading yarn evenness and increasing end breakage rate — the primary productivity metric in ring spinning. A 10% improvement in suction efficiency typically reduces end breakages by 5–8 breaks per 100 spindle hours.