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.