Friction shafts for differencial rewinding

Friction shafts are the ideal solution for multiple and independent rolls rewinding on the same shaft, as each one needs a proper web tension.

During the rewinding process of multiple rolls, obtained after the cutting process of a plastic film or paper or any other material, is it common to have important differences of thickness and, consequently, differences of the web tension.
To solve this issue, the friction shafts ensure a different management of the rolls locking onto one or multiple friction rings the core of each roll to obtain a precise rewinding and a uniform web tension of each roll.

Friction rings with balls :
Friction rings with balls are made of hard black anodized aluminium or steel depending on the width. An inner bearing of spheres increases the sturdiness of the ring, even if made in aluminium, and makes the sliding action more fluid. Friction rings with widths starting at 12,15 mm, can be equipped with preloaded positioners to increase the stability of the reel cores before before the gripping balls engage the core.

Friction rings with rollers:
Friction rings with rollers, made of hard black anodized aluminium or steel depending on the width, are equipped with wider supporting surface expanding rollers that guarantee the best performance in any working condition. An inner ball bearing of spheres increases the sturdiness of the ring, even if made in aluminium, and makes the sliding action more fluid. Friction rings with widths starting at 19,65 mm, can be equipped with preloaded positioners to increase the stability of the reel cores before the gripping rollers engage the core.

• Wider supporting surface: the gripping rollers provide a wide supporting surface which ensures greater stability of the roll core that remains perfectly perpendicular to the central shaft.
• No damage to the reel core: expanding balls often create a groove in the cores during roll unloading while expanding rollers guarantee safe and easy roll removal without damaging cores. Since cores are not damaged, they can be reused.
• Usage both with carton and plastic cores: thanks to the wider supporting surface, the friction rings with expanding rolls ensure a perfect grip both with carton and plastic cores avoiding any kind of core slipping.