A differential rewind shaft is the ideal solution for simultaneous, independent rewinding of multiple slit rolls. Slit rolls of material can rewind uniformly on the same shaft even when material thickness across the web varies. This consistency is important for wound roll quality. To achieve consistent tension, friction shafts use narrow rings which slip to compensate for the varying web thickness. Winding rolls are gripped separately by one or multiple friction rings, creating the opportunity for each to wind with uniform web tension.

All Re friction rings are made of hard black anodized aluminum or steel (depending on the shaft length). An inner ball bearing increases the sturdiness of the ring and makes the sliding action more fluid. Friction rings can be equipped with preloaded positioners to increase the stability of the roll cores before the gripping elements engage the core.

Re differential rewind shafts can have two types of gripping elements. 

FRICTION RINGS WITH ROLLERS 
This type of ring can be provided in different widths starting at  3/4″.

• Wider supporting surface yields greater stability of the roll core.
• No damage to the roll core. Ball-style rings can create a groove in the cores during roll unloading while rollers guarantee easy roll removal without damaging cores. Since cores are not damaged, they can be reused.
• Usage both with paper or plastic cores without core slipping.

FRICTION RINGS WITH BALLS
This type of ring can be provided in different widths starting at 1/2″. We apply this type of ring for very narrow cores.