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Pneumatic Differential Winding Shaft

Air Slip Shaft

Air slip shafts use pneumatic core locking and controlled differential slip to support stable torque transmission, core holding and multi-roll winding quality in slitting and rewinding applications.

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Air Slip Shaft shaft view 1
Air Slip Shaft shaft view 2

Shaft Structure & Winding Function

Controlled winding torque for slit roll quality.

Suitable for PET film, electronic film, packaging film and lithium battery-related separator, electrode, copper foil or aluminum foil slitting applications where suitable.

  • A central air-pressure shaft provides pneumatic locking, pneumatic slip and accurate torque transmission over a wide tension range.
  • The roll core stays positioned during forward and reverse rotation, making the design suitable for automatic roll loading and unloading.
  • Dual-air-path XC versions separate locking pressure from regulating pressure, enabling continuous control from very low tension to higher winding tension.
  • New air-expanding versions with assist wheels or rolling surfaces make large-diameter and heavy-roll rewinding easier to unload.
Core Size3-inch standard core, 76.2 +/- 0.2 mm
Ring OD75.5 mm body OD, up to 77.9 mm expansion point
Ring Widths19, 20, 25, 30, 35, 40, 45, 50, 60 mm depending on version
Expansion PieceMetal expansion piece or rubber expansion piece
Control OptionsSingle air path, dual air path, dual-link dual air path and ultra-low-tension versions

Slip Ring

Slip ring options and core-contact details

Different slip ring structures can be selected according to core size, ring width, air path, expansion piece and winding tension requirement.

Air Slip Shaft slip ring 1
Air Slip Shaft slip ring 2
Air Slip Shaft slip ring 3
Air Slip Shaft slip ring 4
Air Slip Shaft slip ring 5
Air Slip Shaft slip ring 6
Air Slip Shaft slip ring 7
Air Slip Shaft slip ring 8
Air Slip Shaft slip ring 9
  • Slip rings can be configured with metal expansion pieces or rubber expansion pieces.
  • The 3-inch standard ring has a body outside diameter of 75.5 mm and expands to 77.9 mm at the highest point.
  • Standard core fit is 76.2 +/- 0.2 mm for paper, plastic or composite cores; special core sizes can be customized.
  • Available inner diameters include 45, 49 and 50 mm.
  • Single-air-path rings are commonly 40 mm wide, with 19, 20, 25, 30, 35, 45 and 50 mm options.
  • 8-piston rings are suitable for packaging film and general film slitting; 12-piston rings suit lithium battery electrode and separator slitting; 16-piston rings suit power battery copper and aluminum foil slitting.
  • Dual-air-path rings can be as narrow as 20 mm, with 25, 30, 35, 50 and 60 mm options for power battery electrode, copper foil and aluminum foil slitting.
  • Ultra-low-tension rings are typically 50 mm wide for extremely low friction tension, including 10 micron PET and electronic film.

Selection Notes

Confirm core material, core inner diameter, required width, winding tension range, shaft structure and whether the application needs low starting tension or higher roll-holding force.

Technical Reference Data

Pull force and pressure reference values for preliminary selection.

Reference values should be confirmed according to the actual shaft structure, ring width, groove material and air path before final selection.

40 mm Dual-Air-Path Key-Type Slip Ring Pull Force

Test condition: four 8 mm pistons, 40 mm wide dual-air-path key-type slip ring.

Air Pressure (kg/cm2)0.20.40.60.811.21.41.61.822.22.42.62.8
Pull Force (N)1.92.12.42.62.83.13.53.84.24.64.95.25.66.1
Air Pressure (kg/cm2)33.23.43.63.844.24.44.64.85
Pull Force (N)6.36.87.37.68.08.38.58.79.09.39.5

25 mm Akihara Dual-Key Slip Ring Pull Force

Test condition: four 8 mm pistons, 25 mm wide dual-key slip ring.

Air Pressure (kg/cm2)00.511.522.533.544.555.566.4
Pull Force (N)0.20.71.52.12.53.23.64.14.65.05.45.76.27.6

Related Slip Shaft Types

Low Tension Slip Shaft

Low tension slip shafts are designed for sensitive materials that require stable winding at low air pressure and low torque.

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DS Slip Shaft

DS slip shafts provide pneumatic locking and controlled slip for medium-tension film slitting and rewinding applications.

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Ball Slip Shaft

Ball slip shafts can be configured as center-air, pneumatic side-pressure or mechanical side-pressure structures for flexible narrow-roll winding.

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Double Ball and Roller Slip Shaft

Double ball and roller slip shafts use extended expansion contact points to support stable core holding and winding torque.

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Key Slip Shaft

Key slip shafts use rectangular metal or rubber keys to expand and contact the core for controlled differential winding.

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