4 Main Types of Air Shafts: Leaf, Lug, Strip & Manual Air Shaft Complete Guide

  Air shafts are essential core components for slitting, rewinding, coating, printing and packaging machinery in the web converting industry. They expand and contract via inflation and deflation to quickly lock and release roll cores, featuring easy operation, firm gripping and high compatibility.

  There are four widely used air shaft types in industrial applications: Leaf type Air Shaft, Lug type Air Shaft, Strip Type Air Shaft and Manual Air Shaft. This article elaborates on their structure, working principle, advantages and applicable scenarios to help you select the right model for your production line.

Watch the working demonstration of these 4 air shafts here: Application Video

Browse the full product range: Air Shaft Collection

1. Leaf type Air Shaft

  The Leaf type Air Shaft is designed for thin-walled cores and delicate web materials. It delivers uniform pressure and excellent concentricity, which makes it a top choice for precision converting lines.

Structure & Working Principle

  Multiple flexible metal leaves are evenly arranged around the shaft body. When inflated, the internal airbag pushes all leaves to expand outward and fully fit the inner wall of roll cores. After deflation, the leaves retract automatically for easy core removal. This full-surface contact design prevents core deformation and material damage effectively.

Key Advantages

· Uniform pressure distribution, no damage to thin paper tubes, plastic cores and fragile materials

· High concentricity, stable operation even at high running speed

· Low noise and long service life

· Available for coreless winding upon request

Applications

Ideal for thin films, aluminum foil, battery separators, non-woven fabrics, thermal paper and other high-precision, lightweight web materials.

Learn more: Leaf type Air Shaft

2. Lug type Air Shaft

  As the most universal model, the Lug type Air Shaft features strong load-bearing capacity and outstanding durability, widely adopted in heavy-duty converting industries.

Structure & Working Principle

  Independent metal lugs are mounted on the shaft surface. The internal airbag pushes lugs to pop out for firm clamping after inflation. Lugs reset by spring force while deflating. With large expansion stroke and strong gripping force, this type fits most standard rigid roll cores.

Key Advantages

· Super high torque resistance, suitable for heavy load working conditions

· Fast inflation and deflation, greatly improve production efficiency

· Simple structure, easy maintenance and low replacement cost

· Wide size range, compatible with various thick-walled paper and metal cores

Applications

Perfect for paper rolls, textiles, leather, waterproof rolls, thick plastic films and all kinds of heavy-duty winding and unwinding processes.

Learn more: Lug type Air Shaft

3. Strip Type Air Shaft

  The Strip Type Air Shaft combines the merits of leaf and lug style shafts. It is lightweight, high-strength and anti-slip, specially optimized for high-speed multi-station slitting machines.

Structure & Working Principle

  Equipped with continuous long strips and multiple independent airbags, the shaft expands evenly to hold roll cores tightly. The strip contact surface balances gripping force and uniformity, and the lightweight aluminum alloy body reduces overall equipment load.

Key Advantages

· Light weight with high rigidity, reduce machine operation load

· Good anti-slip performance, avoid material shifting during high-speed running

· Fast air response, suitable for continuous mass production

· Easy disassembly and daily maintenance without special tools

Applications

  Mainly used for label slitting, multi-group narrow web processing, film slitting and laminating production lines.

Learn more: Strip Type Air Shaft

4. Manual Air Shaft

  Different from pneumatic models, the Manual Air Shaft adopts pure mechanical expansion structure, requiring no air compressor or air piping system. It is the best solution for small machines and workshops without air supply.

Structure & Working Principle

  This shaft relies on internal cam and screw mechanism. Operate the hand knob to expand or retract the gripping parts manually. The compact mechanical structure avoids air leakage issues and works stably in simple working environments.

Key Advantages

· No compressed air required, flexible for mobile equipment and small workshops

· Simple operation, friendly for new operators

· Low failure rate, good dustproof and waterproof performance

· Compact size, match perfectly with mini slitter and rewinder

Applications

Widely used on table-top slitting machines, laboratory test equipment, small batch production and sample making.

Learn more: Manual Air Shaft

Comparison & Selection Guide

Type	Contact Style	Main Features	Best For	Not Recommended For
Leaf type	Full surface contact	Precise, material-friendly, high concentricity	Thin films, fragile materials, high-speed precision lines	Heavy load, thick rigid cores
Lug type	Point contact	High load capacity, durable & universal	Heavy rolls, thick cores, frequent core changing	Ultra-thin delicate materials
Strip Type	Strip contact	Lightweight, anti-slip, high speed	Multi-station slitting, medium load webs	Extreme heavy load, super soft thin cores
Manual	Mechanical contact	No air supply needed, cost-effective	Small machines, sample production, no air system	Automatic production lines, large batch heavy load work

Final Summary

  Each air shaft type has its unique strengths. Choose Leaf type Air Shaft for delicate and precision materials; pick Lug type Air Shaft for heavy-duty production; select Strip Type Air Shaft for high-speed multi-station slitting; go for Manual Air Shaft if you have no air supply system or use small processing machines.

Check our full lineup to find your ideal air shaft: Complete Air Shaft Series