Variable density rolls

1. This is caused by:
— varying web tension as the roll is being wound.
— changing pressure or speed of the riding roll when winding.
— variation in the relative torque of the two winding drums giving different densities from the core to the outside face.
2. May be corrected by rewinding with a constant-tension device.
3. Adjust the winding drums so the difference in torque is gradually reduced as the roll is built.
4. Ensure that the speed of the riding roll is reduced at a rate that it compensates for the pressure on the drums generated by the increasing weight of the windup reel as it builds.