Excessive foam present in the printing unit, tray or ink pump unit.


– Ink too weak or too low in viscosity;

– Plate surface uneven;

– A coating left on the plate surface from plate making;

– Dirty or pitted impression cylinder;

– Uneven or unreceptive substrate;

– Ink not wetting out on substrate;

– Ink reticulation caused by excessive of antifoam;

– Foreign matter collecting on plate surface;

– Worn anilox roll.


– Add fresh ink or medium to correct viscosity for greater opacity level;

– Increase plate to substrate impression. Increase ink viscosity. Increase ink film thickness. Use softer plate durometer;

– Wash plate thoroughly with a compatable cleaning solution. Remake plate;

– Impression roller must be thoroughly cleaned of ink and other foreign materials;

– Use softer or compressible plates or cushion mounting tape. Check treatment levels on substrate;

– Ensure solvent balance is correct. Change ink system. Contact ink and substrate supplier;

– Replace with fresh ink;

– Thoroughly wash plate. Check ink filters are working. Check supplier re detack level of plate. Ensure plate surface is not wiped with aggressive solvents;

– Examine anilox roll for wear, plugging or for exces­sive land areas. Use a higher screen anilox roll.

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