Packaging and general film
Eight-piston rings are the standard build for packaging film and general film slitting.
Pneumatic Differential Winding Shaft
Air Differential Friction 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. Also known as: air slip shaft, pneumatic differential shaft.
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 Size | 3-inch standard core, 76.2 +/- 0.2 mm |
|---|---|
| Ring OD | 75.5 mm body OD, up to 77.9 mm expansion point |
| Ring Widths | 19, 20, 25, 30, 35, 40, 45, 50, 60 mm depending on version |
| Expansion Piece | Metal expansion piece or rubber expansion piece |
| Control Options | Single air path, dual air path, dual-link dual air path and ultra-low-tension versions |
Where an air differential friction shaft is used
Lithium electrode and separator
Twelve-piston rings are specified for electrode and separator slitting, where torque consistency across many narrow rolls decides the yield.
Power battery foil
Sixteen-piston rings are for copper and aluminum foil on power battery lines, including dual-air-path rings for 12–17 mm foil widths.
Automatic load and unload
Pneumatic locking holds the core through forward and reverse rotation, so the core does not shift or loosen on automatic handling systems.
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.
- 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.
Note on this data: the two tables below are measured on key-type slip rings, as published in the manufacturer's technical document. They show how pull force tracks air pressure on a dual-air-path ring and are useful as a reference for that relationship, but they are not a substitute for air-ring figures. Ask us for the pull force data for the specific ring width, piston count and friction material you are considering before you size a shaft.
Pressures are given in kg/cm² as published by the manufacturer. For conversion: 1 kg/cm² = 0.98 bar = 14.2 psi. So 1 kg/cm² ≈ 1 bar, and 5 kg/cm² ≈ 4.9 bar ≈ 71 psi.
How to use these figures: they are reference values for a single ring, measured under the stated test conditions — that ring width, that friction material and that groove. Total winding torque on your machine depends on how many rings are on the shaft, the roll diameter as it builds, the condition of the friction material and the line speed, so these numbers cannot be used directly to calculate web tension. Send us the slit widths, the number of rolls across and the tension range you need, and we will confirm the ring configuration before you size anything.
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) | 0.2 | 0.4 | 0.6 | 0.8 | 1 | 1.2 | 1.4 | 1.6 | 1.8 | 2 | 2.2 | 2.4 | 2.6 | 2.8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pull Force (N) | 1.9 | 2.1 | 2.4 | 2.6 | 2.8 | 3.1 | 3.5 | 3.8 | 4.2 | 4.6 | 4.9 | 5.2 | 5.6 | 6.1 |
| Air Pressure (kg/cm2) | 3 | 3.2 | 3.4 | 3.6 | 3.8 | 4 | 4.2 | 4.4 | 4.6 | 4.8 | 5 | |||
| Pull Force (N) | 6.3 | 6.8 | 7.3 | 7.6 | 8.0 | 8.3 | 8.5 | 8.7 | 9.0 | 9.3 | 9.5 |
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) | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 | 5.5 | 6 | 6.4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pull Force (N) | 0.2 | 0.7 | 1.5 | 2.1 | 2.5 | 3.2 | 3.6 | 4.1 | 4.6 | 5.0 | 5.4 | 5.7 | 6.2 | 7.6 |
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.
View DetailsDS Slip Shaft
DS slip shafts provide pneumatic locking and controlled slip for medium-tension film slitting and rewinding applications.
View DetailsBall Slip Shaft
Ball slip shafts can be configured as center-air, pneumatic side-pressure or mechanical side-pressure structures for flexible narrow-roll winding.
View DetailsDouble Ball and Roller Slip Shaft
Double ball and roller slip shafts use extended expansion contact points to support stable core holding and winding torque.
View DetailsKey Slip Shaft
Key slip shafts use rectangular metal or rubber keys to expand and contact the core for controlled differential winding.
View Details