PRESS
How to decrease creasing

July 2007

multipage

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

• MORE ON
• SHEETFED OFFSET PRINTING