Rewinders-A Look at the Future

• Varying tension: This can be a result of incorrect torque increase with relationship to rewind roll diameters. Web tension will decrease inversely with roll radius and therefore, Ivens said, torque must be increased to compensate. He offered this formula: Total Torque = Tension x Radius, where total torque is the combination of torque applied to overcome the change in radius, plus frictional torque applied as a result of increasing rewind roll weight.