Tips

There are a lot of advantages to using leaf type air shafts. Generally, leaf type air shafts provide the best core concentricity for high speed applications. They provide high core gripping torque and are often times the best choice for high tension applications, not allowing the core to slip as a roll is unwound or rewound.

Even though leaf type air shafts and chucks deliver large amounts of torque in the machine direction, they do not supply a lot of torque in the cross machine direction. Simply take a look at the design of most leaves in leaf type shafts and you will see how the serrated nature of the leaf design just will not supply large amounts of torque across the face of the shaft or chuck.

Most unwind and rewind applications do not require torque be delivered in the cross machine direction. However, if your rolls have a tendency to "walk" to either side (generally a machine alignment problem), some or all of the leaves can be plasma coated to greatly boost the cross machine direction torque leaf type air shafts will supply to the ID of your rolls core. Plasma coating the outside of the leaves of leaf type air shafts or chucks may stop roll cores from walking side to side.