When it comes to air expanding shafts, traditional models are typically governed by a single airbag that controls the entire shaft. Whether they're board-type or key-type shafts, they 

commonly rely on a single circular airbag. However, any air leakage renders the entire shaft inoperable. With the increasing demand for precision, a new alternative, the key-type expanding 

shaft, emerges as a leading contender. Comprised of multiple flat airbags, this shaft exhibits superior overall precision compared to traditional models, meeting the stringent requirements 

of a significant clientele. Nevertheless, it has a drawback—it maintains a constant tension and cannot be adjusted to accommodate varying material thickness during winding. This 

inconsistency results in uneven winding, material wastage, and inefficient resource utilization.

Slip differential shafts come in two primary variations: central air pressure and lateral pressure. Both feature slip rings that enable the simultaneous winding of multiple materials. They 

counteract uneven material thickness, ensuring a consistent winding effect. These shafts regulate tension by adjusting air pressure to maintain stability. When the material winds too tightly, 

the slip rings allow controlled slippage, eliminating excessive tension and achieving the desired winding effect. This tension is directly related to the air pressure, reflecting in the final tension 

magnitude. Modern slitting machines are equipped with an air pressure system that adjusts tension as the roll diameter increases. However, users without this system must manually adjust, 

relying on the expertise of machine operators to regulate air pressure during operation.

Traditional air expanding shafts lack segmented structures, hindering their slip differential functionality, leading to an inadequate response to tension variations during multi-material slitting. 

This deficiency often results in uneven winding, material loss, and operational inefficiencies due to varied material thickness. These shafts operate at lower winding speeds and cannot 

simultaneously accommodate rolls of different sizes.