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 re-torque blanket.

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Problem:

Prolonged use of oily wash-up solutions has occurred.

Solution:

Change to fresh wash-up solution.

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Problem:

Plate is not properly sensitized.

Solution:

Consult your pre-press department.

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Problem:

Fountain solution is out of balance.

Solution:

Drain pans and tanks. Refill with fountain solution of correct pH and conductivity.

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Problem:

Ink film is too heavy.

Solution:

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

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Problem:

Roller train temperature is too hot.

Solution:

Maintain 80° – 85°F surface temperature on oscillators.

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Problem:

Fountain solution is too hot in pans.

Solution:

Maintain fountain solution at 60° – 65°F in press pans.