It is seen during printing on large surfaces. Causes and solutions:

Causes of Buffer

If the bumper shape is not suitable, different shaped bumpers should be tried.

Causes of Cliché

If the cliché depth is wrong, a new cliché should be prepared at the appropriate depth.
If the tram type is wrong, a new cliché should be prepared with a different tram.
If the cliché is placed incorrectly, it should be tried by turning the cliché so that the long lines in the design are printed at different angles.

Reasons Caused by Ink

If the ink-additive ratios are not suitable, the ink mixture must be prepared in the correct proportions before it is put into the ink tank.
If the ink is thin, the amount of thinner added to the ink should be reduced.
If the ink is too thick, the amount of thinner added to the ink should be increased.

Reasons Based on Material

If the material surface is unformed, a buffer of the appropriate type should be used.

Other Causes

If the scraper blade is too soft on machines with an open ink tank, a suitable scraper blade and ink reservoir should be used.