1. The air expanding shaft, also known as an air mandrel or air inflatable shaft, is to securely hold and expand the inner diameter of a roll of material during winding or unwinding processes. This type of shaft uses compressed air to inflate elastomeric sleeves or bladders located within its core. By inflating the sleeves, the shaft expands and tightly grips the inner diameter of the roll.

2. The air expanding shaft provides efficient and consistent control over the tension and alignment of the material being wound or unwound. It ensures that the material is held securely in place without slippage or wrinkling, which can lead to production issues and product defects. Additionally, the shaft allows for easy and quick roll changes, enhancing productivity and minimizing downtime in manufacturing processes that involve handling large rolls of material.