Medium-Tension Pneumatic Slip Shaft

DS Differential Friction Shaft

DS slip shafts provide pneumatic core locking and controlled slip for medium-tension film slitting and rewinding applications. Also known as: DS slip shaft, DS friction shaft.

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DS slip shaft with segmented metal body and gold-coloured end collars

DS Pneumatic Locking & Slip

Why DS needs 0.8 kg/cm² to start

Suitable for automatic roll loading and unloading, medium-tension film slitting and flexible packaging laminate rewinding.

Center-air-pressure slip shaft with pneumatic locking and pneumatic slip.
Provides accurate torque and precise tension control over a broad range. Starting working pressure is 0.8 kg/cm² or above, so this shaft cannot be used where the winding has to start at very low tension — for that, use the low tension shaft, which works from 0.1 kg/cm².
The core remains stable and does not shift or loosen during forward and reverse rotation.
A practical option where stable core holding and controlled winding torque are required.

3-inch Ring	75.5 mm OD, 77.8 mm expansion point, 45 mm ID
6-inch Ring	151 mm OD, 155.5 mm expansion point, 70 mm ID
Core Sizes	76.2 +/- 0.2 mm and 152.4 +/- 0.2 mm
Widths	40 mm standard; 30, 35 and 45 mm options for 3-inch
Starting Pressure	0.8 kg/cm² (0.78 bar / 11.4 psi) minimum — this shaft cannot start at low tension

DS winding duties for medium-tension laminates

Medium-tension film slitting

The intended range. Below roughly 0.8 kg/cm² this shaft will not start, so it is not a low-tension solution.

Flexible packaging laminates

Particularly suited to laminated soft packaging film according to the manufacturer.

Automatic roll handling

The core stays put through forward and reverse rotation, which is what automatic load and unload systems need.

6-inch cores

The 6-inch build (151 mm OD, 70 mm ID) is the common configuration for wider laminate lines.

Slip Ring

DS ring bores: 45 mm for 3-inch and 70 mm for 6-inch

DS slip rings can be selected according to core size, ring width, air path, required torque and winding tension range.

3-inch ring outside diameter is 75.5 mm and expands to 77.8 mm.
Suitable 3-inch core inner diameter is 76.2 +/- 0.2 mm for paper or plastic cores.
3-inch ring inner diameter is 45 mm, with standard 40 mm width and 30, 35 and 45 mm options.
The DS 6-inch ring has a 151 mm outside diameter and reaches 155.5 mm on expansion.
Suitable 6-inch core inner diameter is 152.4 +/- 0.2 mm for paper or plastic cores.
6-inch ring inner diameter is 70 mm with standard 40 mm width.

Selection Notes

For DS selection, establish that the application can start at 0.8 kg/cm² or above before finalizing ring sizes. Record the medium-tension material and whether the core is paper or plastic. A lower starting-pressure requirement belongs in a comparison with the low-tension structure, rather than in a request to copy only the outside dimensions of a DS ring.

Replacement Slip Rings

Replacement DS rings for the existing core and shaft bore

Availability

DS slip rings are supplied separately, so replacing a ring does not require replacing the whole DS shaft. A dimensionally matched DS structure can also be reviewed for a shaft made by another manufacturer. Replacement lead time is confirmed with the quotation after checking the size and pressure information.

What to measure / send

Give the DS core size and ring bore together: 3-inch cores use the listed 45 mm ring inner diameter, while the standard 6-inch configuration lists 70 mm. Measure ring width, with 30–45 mm options on the 3-inch version and 40 mm standard for 6-inch. State the starting pressure, specified at 0.8 kg/cm² or above. Add core inner diameter (76.2 or 152.4 mm), keyslot or air-hole positions, quantity, and old-ring and shaft photos.

What ships

The order covers a DS slip ring of the agreed structure, configured to the confirmed inner diameter, width and friction material. The core-size version is recorded with those dimensions so a 3-inch DS request is not confused with the larger-bore standard 6-inch assembly.

Starting pressure sets a boundary for the DS application

The DS description combines center-air pressure, pneumatic locking and pneumatic slip for medium-tension winding. It also states a starting working pressure of at least 0.8 kg/cm². This is a selection boundary, not just a value to add to a drawing: if the web must begin winding below that pressure, the low-tension page is the relevant comparison. For laminated soft packaging films and automatic roll handling, describe the operating material and forward or reverse winding duty with the ring measurements.

Standard DS dimensions and a test specimen are not identical

The dimensional list identifies a 45 mm inner diameter for the three-inch DS ring and 70 mm for the standard six-inch ring. The force test below is explicitly a six-inch, 40 mm wide ring with a 55 mm inner bore. Those are the published conditions of that specimen and are retained as such. When replacing a ring, measure the installed bore instead of copying the test bore into the order. Include the core size and ring width together so the quotation is tied to your shaft rather than to the reference specimen.

Technical Reference Data

Six-inch DS test readings and their specific test bore

DS force data below retain the individual test dimensions, materials and pressure conditions; compare those conditions with the ring you need.

See the category reference for pressure conversion and interpretation of the DS specimen readings.

DS Slip Shaft Pull Force, Low Pressure Range

Test condition: 6-inch DS slip ring, 40 mm width, 55 mm inner bore.

Air Pressure (kg/cm2)	0.4	0.6	0.8	1.0	1.2	1.4	1.6	1.8	2.0	2.2	2.4	2.6
Pull Force (kg)	0.39	0.46	0.54	0.62	0.76	0.94	1.10	1.20	1.24	1.38	1.47	1.50

DS Slip Shaft Pull Force, High Pressure Range

Continuation of the 6-inch DS slip ring test.

Air Pressure (kg/cm2)	2.8	3.0	3.2	3.4	3.6	3.8	4.0	4.2	4.4	4.6	4.8	5.0
Pull Force (kg)	1.54	1.58	1.64	1.70	1.78	1.84	1.92	2.04	2.10	2.22	2.32	2.42

Need a lower starting pressure than DS? Compare the alternatives

Air Slip Shaft

For battery electrodes or foil, compare the air family’s piston-count and dual-air-path options with the medium-tension DS configuration before selecting a replacement structure.

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Low Tension Slip Shaft

If winding must begin below the DS threshold, start the comparison with low-tension rings rated from 0.1 kg/cm², not with another DS ring width.

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Ball Slip Shaft

If the next DS application instead requires very narrow products, review ball shafts and their stated slitting-from-5-mm capability with the actual roll arrangement.

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Double Ball and Roller Slip Shaft

If extended cylindrical contact is required for rubber, aluminum or paper cores, review roller rings and their 60 mm standard or 55 mm bearing bores.

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Key Slip Shaft

When rectangular keys are specified for core engagement, the key page distinguishes metal from rubber contact and kraft from wool-felt friction material.

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Request DS ring matching for a medium-tension winding line

Have a drawing of your shaft or a photo of the old rings? Send it on WhatsApp or to sales@kendoric.com — we check fit before quoting.