Roll expanding shaft

pneumaticcantilevered

Description
The cantilever pneumatic expanding shafts are designed to facilitate quick loading and unloading of rolls. Standard versions suit rolls weighing under 100 kg; custom designs are available for heavier loads and special applications.

Standard diameters

• Standard body diameters: Ø69 mm, Ø75 mm, Ø148 mm
• Special dimensions available: Ø25 mm to Ø300 mm

Expansion ranges (examples)

• Ø69 → expansion range Ø69–78 mm
• Ø75 → expansion range Ø75–79 mm
• Ø148 → expansion range Ø148–157 mm

Technical data (selected values)
Body diameter [mm]: 69, 75, 148
Operating diameter with short expanders [mm]: typically 73–79 depending on model
Operating diameter with long expanders [mm]: typically 78–157 depending on model
Number of expanding strips: 5 or 6 (model dependent)
Radial clamping force (at 6 bar): typically 42,000–50,400 N (model dependent)
Torque transmission with cardboard cores (rubber expanders 0.4): approx. 630–1,552 N*m/lin m
Torque transmission with cardboard cores (nylon expanders 0.35): approx. 551–1,358 N*m/lin m
Torque transmission with steel/aluminium cores (aluminium expanders 0.7): approx. 1,103–2,717 N*m/lin m
Weight (pneumatic expanding shaft without journals or end caps) [kg/lin m]: typically 5.36–7.54
Recommended inflation pressure: 6 bar

Applications, maintenance and options

• Typical applications: unwind/rewind, packaging, printing, paper and textile lines
• All wear parts are interchangeable (air chambers, valves, connections, expanding strips, clamping jaws)
• Available expander materials: rubber, nylon (0.25 / 0.35), aluminium (0.25 / 0.35 / 0.7) — performance varies with material and thickness

Notes
Detailed model-by-model values (expansion ranges, grip coefficients, torque transmission, radial clamping forces and weights) are provided in the technical datasheet. Custom engineering support is available.