Foaming

Problem:

Too much air being introduced into ink.

Solution:

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

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Problem:

Pump pressure is excessive, causing splashing and aeration.

Solution:

Reduce pump pressure to minimum required (use pump volume, not pressure).

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Problem:

Agitation of ink is causing excessive splashing and aeration.

Solution:

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

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Problem:

Poor sealing of doctor blade assembly.

Solution:

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

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Problem:

Too much water is being added to the ink.

Solution:

Raise ink viscosity by adding fresh ink.

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Problem:

Ink viscosity is too high.

Solution:

Lower ink viscosity to release trapped foam.

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Problem:

Ink formulation is incorrect.

Solution:

Consult your local Sun Chemical representative.