Roll expanding shaft

pneumaticaxial displacementdouble support

Overview
This pneumatic expanding shaft is equipped with manual axial displacement systems for precise web alignment. It is suitable for both double-supported and cantilever (single-supported) shaft arrangements and is intended for industrial rewind/unwind applications where axial positioning of the web is required.

Main features

• Manual axial adjustment for accurate web tracking
• Applicable to double-supported and cantilever expanding shafts
• Standard sizes and custom manufacture from Ø25 mm to Ø300 mm

Axial Adjustment Systems for Expanding Shafts

• Axial Non-Stop: Mechanism allows the knob to be released for manual axial displacement while the machine remains running — suitable for high-production lines.
• Simple Axial: Allows axial displacement but the knob remains linked to shaft rotation; machine stop may be required for safe adjustment.

Standard diameters and expansion ranges

• For core Ø70 mm (ID 70 mm) — Expansion range: Ø69–71 mm
• For core Ø76 mm (ID 3') — Expansion range: Ø74–76 mm
• For core Ø152 mm (ID 6') — Expansion range: Ø148–157 mm
• Custom dimensions available: special manufacture from Ø25 mm to Ø300 mm

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
Expanders in nylon 0.35 [N*m/lin m]: 551 | 662 | 714 | 1358
Expanders in aluminum 0.35 [N*m/lin m]: 551 | 662 | 714 | 1358
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
Weight of the pneumatic expanding shaft (without journals or end caps) [kg/lin m]: 5.68 | 5.36 | 6.41 | 7.54
Recommended inflation pressure [bar]: 6 | 6 | 6 | 6

Applications

• Web alignment and axial adjustment in printing, packaging, paper and textile machinery
• High-production lines requiring on-line axial adjustment (with Axial Non-Stop)
• Custom solutions for non-standard core diameters and specific torque or clamping requirements

Technical specifications

• Type: Pneumatic expanding shafts with axial displacement (manual axial adjustment systems)
• Axial systems available: Axial Non-Stop (manual displacement without machine stop), Simple Axial (machine stop may be required)
• Standard core sizes and expansion ranges: Ø70 mm (Ø69–71 mm), Ø76 mm (Ø74–76 mm), Ø152 mm (Ø148–157 mm)
• Custom manufacture range: Ø25 mm to Ø300 mm
• Number of expanding strips: typically 5 or 6 depending on diameter
• Radial clamping force at 6 bar: up to 50,400 N depending on size
• Torque transmission examples (N*m/lin m) with cardboard cores and various expander materials provided in the technical table
• Indicative weight (kg/lin m): from 5.36 to 7.54 depending on variant
• Recommended inflation pressure: 6 bar