There maybe several causes contributing to “out of square” sheets. It is best to work your way through the cutter, correcting any maladjustment you encounter.
First, make sure the top slitters are set properly against the bottom rings. If the top slitters penetrate into the web flow too much, the web will deflect and wrinkle.
Second, inspect the rubber covered squeeze roll. Be sure the roll has not worn unevenly across the sheeter. Also confirm that the nip pressure is set equally on both sides of the squeeze roll.
Third, be sure that the doctor board before the knife is level across the cutter and set properly to the lower cross cutting blade.
Next, look at the delivery mouth section after the cutter. The pinch should be even across the machine, with slight resistance when pulling the leading edge of the cut packet by hand through the tape section. Also, be sure that the top and bottom tapes are evenly distributed across the delivery system.
