Roll expanding shaft

aluminumpneumaticdouble support

Overview
Lightweight pneumatic double-support expanding shafts designed for precise, stable handling in converting and roll-to-roll processes. Multiple body diameters and expander options allow adaptation to different core types and operational requirements.

Product family

• Lightweight double-supported pneumatic expanding shafts (pneumatic expanding shaft, double support)

Standard diameters / Typical core sizes
For core Ø70 mm (ID 70 mm) — Expansion range: Ø69–71 mm
For core Ø76 mm (ID 3') — Expansion range: Ø75–77 mm
For core Ø152 mm (ID 6') — Expansion range: Ø148–157 mm

Custom manufacturing
Special manufacturing available from Ø25 mm to Ø300 mm. Mechanical features, expander materials and dimensions can be tailored to meet specific torque, gripping and weight requirements.

Technical Data Table
Body diameter [mm]: 69 | 69 | 75 | 148
Operating diameter with short expanders [mm]: 73 | 73 | 79 | /
Operating diameter with long expanders [mm]: 78 | 78 | 84 | 157
Number of expanding strips [N/lin m]: 5 | 6 | 6 | 6
Radial clamping force (6 bar) [N]: 42000 | 50400 | 50400 | 50400
Torque transmission with cardboard cores — Expanders in rubber 0.4 [N*m/lin m]: 630 | 756 | 816 | 1552
Torque transmission with cardboard cores — Expanders in nylon 0.35 [N*m/lin m]: 551 | 662 | 714 | 1358
Torque transmission with cardboard cores — Expanders in aluminum 0.35 [N*m/lin m]: 551 | 662 | 714 | 1358
Torque transmission with steel cores — Expanders in aluminum 0.7 [N*m/lin m]: 1103 | 1323 | 1429 | 2717
Expanders in nylon 0.25 [N*m/lin m]: 394 | 473 | 970 | 970
Expanders in aluminum 0.25 [N*m/lin m]: 394 | 473 | 970 | 970
Weight (without journals/end caps) [kg/lin m]: 5.68 | 5.36 | 6.41 | 7.54
Recommended inflation pressure [bar]: 6 | 6 | 6 | 6

Notes
The table shows baseline data for expansion ranges, gripping/torque coefficients and weights. Parameters and performance can be enhanced with custom engineering solutions from the manufacturer's team.

Characteristics / Technical specifications

• Product type: Lightweight double-supported pneumatic expanding shaft
• Standard body diameters (examples): 69 mm, 75 mm, 148 mm
• Expansion ranges (examples): Ø69–71 mm, Ø75–77 mm, Ø148–157 mm
• Operating diameters: values for short and long expanders detailed in the technical table
• Number of expanding strips: 5 or 6 depending on model
• Radial clamping force at 6 bar: up to 50,400 N (model dependent)
• Expander materials: rubber, nylon, aluminium (different thickness/options)
• Weight (without journals/end caps): approx. 5.36 to 7.54 kg per linear meter
• Recommended inflation pressure: 6 bar
• Custom sizes: available from Ø25 mm to Ø300 mm