It is the nightmare of every machine operator and production manager: The job is completed on time, the stitching quality is perfect, all products are complete, the sheet sequence is right for every single copy. If only there weren’t these markings…
Markings and pressure marks on the final print product are indeed a well-known and widespread phenomenon.
The causes are pressure, friction due to mechanical processes during production, speed changes, direction changes, paper transfers or (improper) transport. Printing ink and paper selection also play a crucial role.
But how can markings be avoided?