Mottling

Problem:

Paper has an uneven surface.

Solution:

Check paper for texture and absorbency. Try a different stock.

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Problem:

Too much water is being carried; inks are water-logged.

Solution:

Reduce water; adjust ink/water balance; check chemistry.

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Problem:

Too much water is present in prior unit; water is left on sheet.

Solution:

Reduce water from prior unit.

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Problem:

Stock is weak or paper coating is too soft.

Solution:

Reduce ink tack.

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Problem:

Excessive pressure exists between blanket, plate and/or stock.

Solution:

Ensure all pressures and packing are within manufacturer’s specifications.

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Problem:

Blanket is too hard or glazed.

Solution:

Change to softer blanket or deglaze.