Dirty highlights: dot dipping or ink spitting?

Can you recognise the cause of dirty printing in highlights?It is important to understand wether the issue is related to dot dipping, thus plate-to-anilox ratio, wrong metering of the anilox surface or other causes.What is visible on the printed product is a generally a dirty aspect that forces to repeated stops for plate cleaning and …

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Hollow dots, like donuts, perforate ink layers

Ink builds around small print elements like dots and small type creating hollow shapes like donuts. Inked dots perforate ink layers that were printed by previous printing groups. This happened on external print on plastic film, solvent based inks, flat-top plate, sequence YMCK. Combined action of excessive impression with high ink volume and low viscosity …

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