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Unwanted ink trans­fer onto substrate, ink metering system out of adjustment or dam­aged.

Causes:

– Undissolved ink particles;

– Ink thrown off or dripping from anilox roll;

– Emulsification/water streaks;

– From metering system:

1. Grooved wipe roll;
2. Worn or warped doctor blade;
3. Damaged or dirty anilox roll;
4. Low ink flow;

Solutions:

– Filter particles out of ink, clean plates and anilox;

– Check ink pumps, hosing and blade housing for overflow or leaks. Increase viscosity, replace end seals or wipers;

– Check for water dropping onto the web;

– From metering system:

1. Replace wipe roll;
2. Reduce blade pressure or replace damaged blade;
3. Clean or replace anilox roll;
4. Increase ink flow across the press.