Rieter J20 Air-Jet Spinning Machine — Technical Specification (Typical / Standard)
General Machine Information
Model: Rieter J20
Type: Air-Jet Spinning Machine
Manufacturer: Rieter Machine Works Ltd., Switzerland
Spinning Technology: Com4jet® (air-jet vortex yarn formation)
Machine Configuration: Double-sided with two independent operating sides
Spindle Count: Up to 120 spinning positions (six sections × 20 positions)
Automation Robots: 4 robots (two per side) for automatic piecing, doffing, cleaning, and bobbin change

Production & Performance
Delivery / Spinning Speed: Up to 450 m/min
Independent Machine Sides: Left and right sides can operate two different yarn qualities simultaneously
Bobbin Handling: Separate tube feeder with two independent tube chains (one per side) for different yarn lots

Automation & Control
Automatic Functions:
Automatic piecing after yarn break or clearer cut
Automatic bobbin doffing (full package change)
Automatic cleaning of spinning positions and fiber fly removal
Continuous robot operation even if one robot is under maintenance
Piecing Quality:
Advanced piecing technology producing high-quality splices suitable for downstream processing

Yarn & Process Capabilities
Yarn Formation Process:
Compressed air vortex spinning system forming a core-aligned yarn structure with wrapped fibers, resulting in low hairiness and balanced strength and elongation
Yarn Characteristics:
Low hairiness
Reduced yarn faults
Good abrasion resistance
Stable high-speed production
Lower fiber fly during operation
Machine Construction & Drafting
Drafting System:
Advanced multi-roller drafting arrangement (4-over-4) for precise and gentle fiber control
Traversing System:
Patented traversing mechanism ensuring uniform sliver and yarn distribution
Extended service life of top rollers and aprons
Consistent yarn quality

Operating & Service Features
Bobbin Format:
Cylindrical yarn packages positioned beneath the machine
Winding System:
Dual contra-rotating winding units
Adjustable cross-angle
Precise yarn guidance and stable package build
Machine Operation:
Central electronic control panel for setting drafting parameters, spinning speed, and process conditions
Typical Yarn Count Range (Reference Values)
(Actual performance depends on raw material, machine configuration, and production settings)
Combed Cotton: Ne 30 – 50
Man-Made Cellulosic Fibers (Viscose / Modal): Ne 24 – 40
Blends: Cotton / Viscose, Cotton / Polyester (medium blend ratios)