Accumulation of excess ink on and around the plate surface, especially in regard to small type and halftones.


– Specks of pigment or foreign matter;

– Type, design or screen incorrect

– Ink solvent balance wrong;

– Plate incorrectly made;

– Improper nip settings;

– Pick and offset from a previous colour;

– Inking too heavy;

– Uncontrolled ink viscosity and/or pH range;

– Low fountain roll durometer.


– Use well dispersed inks, free of large particles. Ensure pump and pipework is clean, sieve ink;

– Check design for suitability for flexo work;

– Use recommended solvent mixtures;

– Ensure relief is correct and edges not cupped. If plate is too soft change to a harder durometer;

– Increase pressure settings of fountain roll nip or doctor blade assembly;

– Adjust solvent speeds between colours, ensure interstage drier is balanced;

– Maintain ink viscosity and ensure anilox roller is correct;

– Maintain proper ink viscosity and/or pH range. Ensure ink tray covers are used;

– Use higher roll durometer.

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