Taper Tension Control (automatic tension control)
1) Taper tension control for the Unwind Roll
When the unwind roll is at its maximum diameter the roll can be very heavy. Because of the heavy weight of a full master roll a high braking force is required to achieve smooth running at fast speeds. As the roll reduces in diameter however, it also reduces in weight, and the amount of braking force required is much less. The Daco Taper tension system for the Unwind or Master Roll, continuously monitors the diameter of the master roll, and adjusts the braking force, to exactly match the current roll diameter. Without taper tension, as the roll becomes smaller, unless the tension is reduced manually by the operator, the web can be put under too much tension, causing it to snap or stretch. If a full roll is put on without increasing the tension, the master roll will not be braked enough, which may cause the web to crease or wander, which will lead to poor wind quality of the finished roll. With taper tension, the unwind tension only needs to be set once, and then all adjustments are made automatically, leaving the operator free to concentrate on inspection or other things.
2) Taper tension control for the Rewind Roll
This is basically the reverse of the Unwind system. As the rewind roll increases in diameter the Rewind tension is automatically increased. Without taper tension on the rewind, when winding large rolls, the web will become slack and unstable, as the roll gets larger and heavier. This again will leading to poor wind quality of the finished roll. If rolls larger than 250mm are to be rewound taper tension is recommended.
Taper tension control will give better quality finished rolls, and eliminates the need for the operator to be frequently adjusting the tension settings manually as the roll sizes change. This in turn leads to more efficient running, especially when rewinding delicate products such as films or perforated materials.