Web tension is a force applied to a continuous web in machine direction. It plays an important role in Paper, Textile, Plastics and Metal Industries.
The quality of the processed material (Paper, textile, plastic, or metal) depends on how it is processed during operation.
During the movement of web from start roll to end roll, it passes through various rollers and stations in the machine. These rollers can be both ideal or driven by an electric motor.
If adequate tension is not maintained through out the web, it will create deformation in the material, and in turn, it increases wastage and defects in final product.
Thus, tension plays an important roll in web handling processes.
In order to maintain constant tension, “torque” driving the unwind shaft must decrease at a linear ratio (relative to roll diameter, since unwinder diameter reduces with machine run).
Similarly, the “torque” driving the rewind shaft must increase at a linear ratio, relative to roll diameter as rewind roll diameter increases in size.
There are two types of web tension measurements available.
They are
Author: Vikrant Joshi
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We are using Closed sytem with servo Motor for precise control for speed. In this syem we have used precision Potentiometer on Dancing roll. which is giv acuutate feedback .
potentiometer also gives accurate results.