Shaft is custom-made to the requirements of the application.
The patented design features two sets of expanding ledges that extend along the length of the shaft. When constant air is introduced through a rotary union to the differential friction ledges, they raise and impart sensitive resistance to the inner diameters of the cores as they slip on the shaft to control the web tension. The core stop ledges inflate through a separate valve, and raise to align and guide the webs during the run. All ledges deflate below the surface of the shaft for quick and easy removal of the finished rolls. Slide on the new cores and hand position them in place, inflate the core stop ledge, and begin winding again.