Excessive ink transfer to substrate. Excess colour strength.



Ink viscosity too high or too low with dot gain;

- Colour concentration too high;

- Ink film too thick;

- Contamination from previous colours;

- Nip pressure between rubber roll and anilox roll;

-Wrong anilox roll.



- Check and maintain correct ink viscosity, use a kiss impression only;

- Add extender to ink, reduce ink film thickness;

- Reduce ink thickness by lowering ink viscosity, increasing ink metering effectiveness, decreasing machine speed or anilox volume.Check doctor blade is parallel with a minimum pressure setting;

- Thoroughly clean press station between colour changes and replace ink;

- Set nip pressure to minimum setting or select fountain roll with a higher durometer;

- Change anilox roll specification to a lower cell volume.