Open-End (Rotor) Spinning
category
Open-end (OE) spinning, predominantly rotor spinning, is a high-productivity yarn formation method where fibres are individualized, deposited in rotating rotor groove (50,000-150,000 rpm), twisted by rotor rotation, and continuously withdrawn as yarn without traditional traveler-ring system. Second largest spinning technology (25-30% of staple yarn market), offering 2-3× productivity vs. ring spinning at lower yarn quality.
Role
Revolutionized spinning industry by eliminating multiple preparatory processes (roving production) and achieving breakthrough productivity (200-400 g/rotor/hour vs. ring 150-250 g/spindle/hour) enabling cost-competitive yarns for denim, casual apparel, home textiles, and industrial applications where moderate quality acceptable, producing 25-30 million tonnes yarn annually at 15-30% lower cost than ring equivalent counts.
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Subtopics
- Rotor Spinning Process and Mechanism Rotor spinning stages: (1) opening—sliver fed to opening roller (6,000-8,000 rpm with metallic wire …
- Rotor Design and Geometry Rotor specifications: diameter (28-56 mm, smaller for finer counts/higher speed, larger for coarser …
- OE Yarn Structure and Characteristics OE yarn structure: two-component structure with (1) core fibres (30-40% of fibres, relatively parall…
- OE Yarn Properties and Performance OE yarn properties: tenacity 10-15 cN/tex (15-25% lower than ring equivalent count, cotton 20 Ne OE:…
- OE Spinning Process Optimization Critical parameters: rotor speed (50,000-150,000 rpm, higher for finer counts up to 40 Ne limit, lim…
- OE Spinning Productivity and Economics Productivity advantages: production rate 200-400 g/rotor/hour (2-3× ring spinning), direct sliver-to…
- OE Yarn Applications and Markets Primary applications: denim (60-70% of OE yarn, predominantly weft yarns in combination with ring wa…
- OE Spinning Quality Control Quality monitoring: online evenness monitoring (capacitance-based sensors measuring CV%, thin/thick …
- OE Spinning Variants and Developments OE variants: friction spinning (fibres twisted between rotating drums, no rotor, producing very bulk…
- OE Spinning Future and Challenges Development directions: rotor speed increases (current limit 150,000 rpm, targeting 180,000-200,000 …