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Product overview
Ball Type Differential Shaft (also called Ball Type Differential Air Shaft, Pneumatic Differential Shaft or Slip Differential Shaft) designed for precision slitting and rewinding applications. Provides independent tension control for each rewind core using pneumatic friction ring technology with steel balls to produce controlled slip torque. Suitable for film, paper, foil and flexible packaging materials to ensure stable rewinding and high-quality rolls.

How it works
A ball type differential shaft uses independently controlled friction rings mounted on the shaft body. Pneumatic pressure activates steel balls inside each friction ring, generating adjustable slip torque during rewinding. When variations in material thickness, roll diameter or winding tension occur, each friction ring can slip independently to equalize tension across all rewind cores, preventing wrinkles, telescoping, loose winding and roll deformation.

Applications

• Film slitting and rewinding
• Label converting
• Paper rewinding
• Aluminum foil slitting
• Copper foil processing
• Flexible packaging production
• Lithium battery film manufacturing (separator films)
• Optical film converting
• Nonwoven fabric processing
• Laminating and coating lines

Common materials handled

• PET film
• BOPP film
• CPP film
• PE film
• PVC film
• Aluminum foil
• Copper foil
• Release liner
• Paper
• Label stock
• Nonwoven fabrics

Technical specifications (table)
Item | Specification
Product Type | Ball Type Differential Shaft
Expansion Method | Pneumatic
Core Size | 3 Inch / 6 Inch
Friction Ring Width | 25mm, 30mm, 35mm, 40mm, 45mm, 50mm
Shaft Material | High strength steel or aluminum alloy
Shaft Length | Customized
Slip Torque | Adjustable
Application | Slitting and rewinding machines
Operating Mode | Independent differential tension control
Surface Treatment | Precision machining
Balance Treatment | Dynamic balancing
OEM / ODM | Supported

Benefits

• Independent tension control for each rewind core
• Automatic compensation for web thickness variations
• Improved roll winding consistency and reduced defects
• Reduced wrinkles, telescoping and roll deformation
• Stable slip torque during high-speed operation
• Lower material waste and production losses
• Suitable for narrow web and lightweight materials
• Long service life with minimal maintenance

Material & manufacturing advantages

• Made from seamless steel tubes or high-strength aluminum alloy profiles
• High rigidity and excellent wear resistance
• Resistant to deformation during long-term operation
• Precision machining and dynamic balancing for stable high-speed performance
• Custom shaft diameters, lengths, friction ring widths and torque configurations available

Ordering & production
Standard core sizes: 3 inch and 6 inch. Shaft length, diameter and friction ring configuration can be customized to machine specifications. Typical production lead time indicated: standard production 7–15 working days. Quality inspections performed according to ISO9001 standards prior to shipment.

Caractéristiques / Spécifications techniques

• Type: Ball Type Differential Shaft
• Expansion method: Pneumatic
• Core sizes: 3 inch, 6 inch
• Friction ring widths: 25 / 30 / 35 / 40 / 45 / 50 mm
• Shaft material: High strength steel or aluminum alloy
• Shaft length: Customizable
• Slip torque: Adjustable
• Surface treatment: Precision machining
• Balance: Dynamic balancing
• OEM/ODM: Supported