Telescoping

1. Telescoping or Dished roll is the sideways slippage of the roll that leaves one end convex and the other concave.

— sometimes controlled by putting crossed wooden arms or circular discs at the roll ends.

2. Usually caused by uneven caliper that makes the web slip toward the low-caliper side.

— a condition aggravated by increased tension, slippery paper, or excessive riding-roll pressure.

— may result from loose start on reel.

3. Telescoping is only corrected by rewinding with reduced web tension and riding-roll pressure.