Foaming

Too much air being introduced into ink

Check for leaking pump seals or hoses on the suction side, repair as required

Pump pressure is excessive causing splashing and aeration

Reduce pump pressure to minimum required (Use pump volume, not pressure)

Agitation of ink is excessive causing splashing and aeration

Reduce pump or mixer speed to the minimum required and keep ink return lines submerged

Poor sealing of doctor blade assembly

Replace blades frequently. Adjust chamber for wipe and sealing. Adjust pumping to keep chamber full.

Too much water is being added to the ink

Raise ink viscosity by adding fresh ink

Ink viscosity too high

Lower ink viscosity to release trapped foam

Ink formulation is incorrect

Consult your local Sun Chemical Representative

Excessive foam

Spray a mist of Sun Chemical defoamer over the surface of the bubbles to break foam formation