Be certain there is enough tension to keep the web taut and the slitters are set properly.
Watch the flow between the pull roll section and tape take away section. Make sure the material is staying flat through the cutter. (This is done on MAXSON sheeters using air washed doctor boards.)
In the tape take away section, make sure the conveyor belt pinch is equal from side to side. To be sure the sheets are pulled out straight, evenly spread the tapes out over the material.