Customize High quality air differential shaft for printing machine

The AstraRoll slip differential air shaft is a pneumatic friction differential shaft designed for the rewinding station of slitting machines, where multiple narrow rolls are wound on a single shaft at the same time. Because every material roll has a slightly different diameter build-up, a rigid shaft would force the web to stretch unevenly - causing wrinkles, edge marks and loose rolls. The AS-SD series solves this with independent slip units: each rewind position carries its own friction torque, set once and held automatically.

The shaft is machined from high-strength aluminum, fitted with precision bearings, and powered by durable flat airbags that expand to engage each slip unit. Torque is adjusted by simply changing the inflation air pressure - no mechanical disassembly, no guesswork.

Key Features

• Independent slip control per position - each rewind core holds its own tension, preventing wrinkles and edge damage on multi-roll rewinds
• Pneumatic friction design - torque is set by air pressure and stays consistent across the whole roll build
• Durable flat airbags - high-quality polyester-rubber airbags with excellent resilience and long service life; simple to replace when worn
• Precision aluminum body - lightweight with stable concentric rotation for high-speed slitting lines
• Bearing-fitted core components - quality bearings fitted as standard for smooth, low-vibration running
• Adjustable torque range - friction torque rises with inflation pressure, covering light film to heavy paper webs
• Custom sizes - standard 3", 6", 8", 12" or fully custom diameters and lengths per your drawing
• Machinery test report included - each shaft is tested before shipment, with out-going video inspection available

Technical Specifications

• Type: Slip differential air shaft (friction differential)
• Structure: Pneumatic friction slip units on a straight shaft
• Body material: Aluminum (standard); stainless steel or 45# steel (optional)
• Diameter: 3", 6", 8", 12", or custom per drawing
• Air pressure: 0.1 – 0.8 MPa (typical operating range)
• Friction torque: From ~0.8 N·m at 0.1 MPa to ~3 N·m at 0.8 MPa (typical, adjustable by pressure; varies with size)
• Slip units: Independent per rewind position, quantity per shaft
• Core components: Bearings (included)
• Airbag: Flat type, replaceable
• Surface treatment: HV700 / HV300 coating, or blue oxidation
• Warranty: 1.5 years
• Lead time: 15–20 days (7 days for 1–5 pcs)
• Test report: Machinery test report provided
• Export terms: EXW / FOB / CIF
• Packaging: Export carton or wooden case

Optional Configurations

• Grip type: Friction slip type · Key type · Leaf type · Plate type (Nishimura-style available)
• Airbag type: Flat airbag · Round airbag
• Coating: HV700 · HV300 · Blue oxidation
• Materials: Aluminum · Stainless steel · 45# steel
• Ends & drive: Keyway, flat, D-cut or as per your machine

Applications

• Multi-roll slitting and rewinding of film, foil, paper and laminates
• Label and flexible packaging converting lines
• Printing press rewind shafts with uneven roll widths
• Non-woven fabric and textile slitting equipment
• Any rewind job where each core must hold independent tension

Quality & Delivery

Every AstraRoll slip shaft is manufactured under strict quality control: material inspection, precision machining, airbag assembly, dynamic balance check and a final machinery test report before packing. Out-going video inspection is available on request. Standard export cartons or wooden cases protect the shaft in sea freight, and we ship globally under EXW, FOB or CIF terms.

FAQ

Q1. What is the difference between a slip differential shaft and a standard air shaft?

A standard air shaft expands to grip one core. A slip differential shaft has independent slip units, each holding its own friction torque, so multiple rolls wound on one shaft keep even tension regardless of diameter build-up.

Q2. How is the torque adjusted?

Torque is set by inflation air pressure. Increase the pressure for higher friction torque; reduce it for lighter tension. No mechanical adjustment is needed during a run.

Q3. How long do the airbags last?

The flat airbags are made of high-quality polyester-rubber with good resilience. Service life depends on running hours and pressure, and they are designed for simple, low-cost replacement when worn.

Q4. Can you build non-standard diameters and lengths?

Yes. We manufacture per your drawing, including custom diameters, lengths, number of slip units, coatings and end configurations.

Q5. Which materials are available?

Aluminum is standard. Stainless steel suits cleanroom, food and corrosive environments; 45# steel suits heavy torque loads.

Q6. What is the lead time and MOQ?

Lead time is typically 15–20 days; 7 days for small quantities (1–5 pcs). Small MOQs are accepted for testing and new projects.

Q1. Are you a trader or direct factory?

We are a direct manufacturing factory with over 20 years of expertise in high-end industrial rollers, casters and material handling solutions. Our facility operates with ISO-certified quality management systems, allowing us to maintain full control over production cycles and quality standards. Throughout two decades of growth, we have established deep, long-term strategic partnerships with several listed companies and global automation leaders, proving our reliability as a high-tier industrial supplier.

Q2. What are your main products?

AstraRoll specializes in the engineering and production of three core product lines: Industrial Rollers, Heavy-Duty Wheels, and Precision Casters. We do not just sell components; we provide integrated movement and transport solutions. Our products are widely utilized across high-demand sectors, including: New Energy, Lithium Battery, Mining, Heavy Industry, Medical Institutional, Agriculture and Logistics.

Q3. What about delivery time?

We deeply understand that project timelines are critical.
Standard Products: Usually dispatched within 7–15 working days if the components are in stock.
Customized/OEM Orders: Depending on the complexity and volume, the lead time typically ranges from 20–35 days. This includes time for technical drawing confirmation, specialized tooling, and rigorous pre-shipment testing.
Shipping Methods: We offer flexible global logistics solutions, including FOB and CIF terms. We ship via Sea Freight (for bulk industrial orders), Air Freight (for urgent project needs), and International Express (DHL/FedEx/TNT) for smaller components or samples.

Q4. How can I get a quote for customized products?

Since a significant portion of our business involves specialized engineering, pricing is tailored to your specific technical requirements. To provide an accurate quote, please provide the following details: Technical Drawings or Sketches, Application Environment, Quantity, Special Requests. Our engineering team typically reviews and responds to custom inquiries with a formal quotation within 24–48 hours.

Q5. What is your payment?

TT / Paypal / Western Union / LC / Credit Card etc. are all available to us.