Call us toll free:
8619709992541 [email protected]
Jctprint Machinery Co., Ltd
Looking for a replacement air shaft for your slitting or rewinding machine, but not sure what information to provide?
A custom air shaft must match your machine's dimensions, roll core and operating requirements. Even small differences in shaft dimensions or expanding structure can affect roll gripping, winding stability and installation.
Whether you need a new air shaft or a replacement for an existing machine, confirming the right specifications before manufacturing can help avoid installation problems and unnecessary downtime.
Here are the key details you should prepare when requesting a custom air shaft.
The first step is to confirm the shaft dimensions.
Important measurements include the shaft body diameter, effective working length, overall length and dimensions of both shaft ends.
The working length determines the usable area for supporting the roll core, while the shaft ends must match the machine's bearing and drive connections.
For replacement air shafts, providing an existing shaft drawing is usually the most reliable way to confirm these dimensions.
If a technical drawing is unavailable, clear photos and accurate measurements can help the manufacturer review the required design.
Air shafts use compressed air to expand gripping elements against the inside of a roll core.
The expanding structure must match the core diameter and application.
Common designs include:
Lug Type Air Shaft: Uses expanding lugs or keys to grip the core, commonly used in slitting and rewinding applications.
Strip Type Air Shaft: Uses longitudinal expanding strips to provide contact along the core.
Leaf Type Air Shaft: Uses expanding leaves or plates, depending on the required gripping arrangement.
The appropriate structure depends on the core material, roll weight, operating conditions and machine design.
For a replacement shaft, the existing expanding structure should be confirmed before selecting a different design.
Roll weight is another important factor when designing a custom air shaft.
A shaft must support the roll safely while maintaining suitable stiffness during operation.
If the shaft is not designed for the required load, excessive deflection may affect winding quality and machine performance.
When requesting a quotation, provide the maximum roll weight, roll width and roll diameter whenever possible.
These details help the manufacturer evaluate the shaft structure and load requirements.
Slitting and rewinding machines operate under different production conditions.
Some applications involve lightweight plastic film, while others handle heavier paper, packaging materials or other converting products.
Operating speed, torque and web tension requirements should be considered when designing the shaft.
For high-speed rewinding, shaft stability and reliable core gripping are especially important.
An incorrectly matched air shaft may contribute to roll slipping, uneven winding or frequent production adjustments.
Even when the shaft body diameter and working length are correct, the shaft may not fit the machine if the end connections are different.
Depending on the equipment, the shaft ends may require specific bearing positions, drive connections, keyways or other mechanical features.
For this reason, shaft-end drawings and detailed photos are particularly useful for replacement orders.
If you are replacing an existing air shaft, providing measurements of both ends helps reduce the risk of installation problems.
Yes, in many cases the technical confirmation process can begin without a complete drawing.
You can provide photos of the existing air shaft, machine brand and model, approximate dimensions and information about the roll core.
The manufacturer can then review the available details and identify which additional measurements are needed.
However, critical dimensions and connection details must be confirmed before production.
For complicated or non-standard designs, a technical drawing or physical sample may still be necessary.
To receive a more accurate quotation, prepare the following information:
Machine brand and model
Air shaft body diameter and working length
Overall length and shaft-end dimensions
Roll core inner diameter
Maximum roll weight and roll width
Operating speed or torque requirements, if available
Existing shaft photos or technical drawing
If you do not have all the specifications, you can start by sending your existing shaft photos and machine information.
Our technical team can help confirm the additional details required.
JCTPRINT manufactures custom pneumatic air expanding shafts for slitting, rewinding, printing, laminating and other converting applications.
We provide different expanding structures and customized shaft-end designs according to machine requirements.
Our air shaft designs also consider practical maintenance requirements, including replaceable components where applicable.
Whether you need a replacement air shaft or a customized shaft for new equipment, we can review your technical requirements and confirm a suitable manufacturing solution.
Send us your air shaft drawing, dimensions, machine model or existing shaft photos.
JCTPRINT can help confirm the required specifications and provide a customized air shaft quotation.
Contact JCTPRINT to discuss your air shaft requirements.
