Scumming

Problem:

Ink rollers are of the wrong durometer (too soft or too hard)

Solution:

Check durometer, setting and condition of ink rollers

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Problem:

Ink or dampener rollers are set too tight

Solution:

Check and reset rollers

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Problem:

Blanket is overpacked or not tight

Solution:

Correct packing and retorque blanket

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Problem:

Prolonged use of oily wash-up solutions has occurred

Solution:

Consult your pre-press department

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Problem:

Fountain solution is out of balance

Solution:

Adjust pH and conductivity

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Problem:

Dampening system is improperly maintained

Solution:

Conduct proper maintenance. Refer to Sun Chemical recommended procedures for cleaning and maintenance of fountain solution tanks and press pans

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Problem:

Emulsification characteristics of the ink formulation are incorrect for fountain solution

Solution:

Consult a Sun Chemical representative

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Problem:

Fountain solution formulation is not correct for ink formulation

Solution:

Consult a Sun Chemical representative

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Problem:

Ink film is too heavy

Solution:

Change to a stronger ink and/or consult a Sun Chemical representative

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Problem:

Blanket is glazed

Solution:

Remove glaze or change blanket