PRESS
How to decrease creasing

During printing, feeding and transfer problems can cause sheets to become creased. Among the possible reasons for creasing are incorrectly set or jamming front lays; side lays that draw with too much force; a hold-down device that has been set too tightly; an air blast that is too strong; an incorrect air pressure setting at the point of sheet transfer; poorly functioning or dirty grippers; and excessive or uneven pressure between the rubber and the impression cylinder. To minimize creasing, do the following:

• Inspect the front and side lays

• Avoid setting the hold-down device too tightly

• Reduce the air blast on the sheet feeder

• Optimize the air pressure adjustments at the point of sheet transfer

• Optimize the print lateral feed

• Inspect, clean, and adjust the grippers as needed