Offset Roller Diameter Change After Washing An offset press may run normally before washup, then show a different nip stripe, unstable ink transfer, or a roller that feels softer or harder afterward. If that happens, measure the roller before changing the pressure. Check diameter and hardness while the roller is stable, immediately after washing, and

Offset Roller Nip Stripe Problems An ink or dampening roller stripe may be too wide across the whole face, narrow everywhere, wider at one end, heavy through the center, or broken in a few places. These patterns point in different directions. Before changing the roller setting, measure the stripe at the left, center, and right,

How to Choose Offset Ink and Dampening Roller Covers When an offset press needs one new roller or a complete roller set, the ink train and dampening train should be treated separately. Ink rollers carry, distribute, and split the ink film. Dampening rollers have to wet evenly with fountain solution and keep that liquid film

Offset Dampening Roller Water Film Problems A dry band on one part of the plate, a narrow water streak, or one side running wetter than the other can make ink-water balance unstable very quickly. The visible problem may show up on the plate even though the water film started changing several roller contacts earlier. Before

Offset Ink Roller Stripping and Ink Rejection A dry band appears on one offset ink roller while the rest of the surface still carries ink. In other cases, the whole roller looks normal at startup, then a weak band develops later and the ink film begins to break. Cleaning may restore it for a while,

Offset Ink Roller Glazing and Poor Ink Transfer An offset ink roller may become noticeably shinier while ink pickup turns weak or uneven. Washing improves the roller for a while, then the same glossy area returns during the same paper grade, ink system, or production run. In other cases, cleaning removes the visible deposit but

Gravure ESA Impression Roll Problems Weak electrostatic assist often appears first as a printing change. Fine image areas develop more missing dots, one band across the web transfers less cleanly, or the improvement normally seen with ESA on becomes noticeably smaller. Arcing and changing resistance give stronger location clues. Pay particular attention when either starts