SLITTING & REWINDING MACHINES

800 Turret with Off-loading & Oscillating trim winders

Slitting and rewinding machines are generally supplied as one of the following types:

CENTRE-REWIND SLITTER:

Centre-rewind slitters are most commonly used with lighter grade materials which are wound at lower tensions and generally to smaller roll diameters. Used with extensible materials, centre-rewind slitters are normally twin rewind (duplex) and these will be a shafted operation. These type of machines are extremely flexible and versatile. The products are pure centre re-wound where the winding torque is applied through the core shaft. They can have the facility for gap or contact winding via lay on rollers which controls the amount of air being entrapped within the roll thereby effecting finished roll hardness.
CENTRE-SURFACE REWIND SLITTER:
Centre-surface type rewind slitters are usually configured either as single-shaft (simplex) or dual shaft (duplex) slitting and rewinding machines. These machines are normally used in larger roll production which requires greater tension control than can be achieved with pure surface winders, ideal for materials such as label stock laminates. The surface drive produces the web tension whilst the nip pressure of the pressure roll and the torque from the spindle drive produce the roll hardness. By controlling the nip pressure and torque, the desired roll hardness and profile can be achieved.
TWO-DRUM SURFACE REWIND SLITTER:
The two-drum surface winder typically uses the following method for controlling roll hardness: sufficient wrap around the drum so that the web tension has little effect on the roll hardness when winding non-extensible product. Rewind roll hardness and profile are achieved by nip control on the rider roll pressure and torque control between the surface drums. Two-drum surface winders are normally used as high speed rewind slitters for light-density grades such as non wovens, paper and board.

 

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