Tinting/Toning/Scumming

Problem:

Fountain solution condition

Solution:

Check condition of fountain solution. If dirty and old, replenish with fresh at recommended dosages and correct temperature.

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Problem:

Roller durometer or roller settings are out of specification.

Solution:

Check roller durometers and settings according to press manufacture’s recommendations.

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Problem:

Too much pressure exists between plate and blanket.

Solution:

Check and correct if necessary.

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Problem:

Temperature of roller train and water pan.

Solution:

Form rollers should be close to 75°F (23°C) and water pan 65°F (18°C).

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Problem:

Improperly overpacked cylinders – too much squeeze.

Solution:

Correct packing and re-torque blanket to press manufacturer’s specifications.

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Problem:

Ink or dampener rollers are set too tight.

Solution:

Check and reset rollers to press manufacturer’s specifications.

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Problem:

Blanket is glazed.

Solution:

Remove glaze or change blanket.

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Problem:

Fountain solution is out of balance.

Solution:

Drain pans and tanks. Refill with fresh fountain solution at correct pH, conductivity, and Brix level.

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Problem:

Prolonged use of oily wash-up solution.

Solution:

Change to fresh wash-up solution.

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Problem:

Roller train temperature is too hot.

Solution:

Maintain forms at 72°-80°F (22°-26°C) surface temperature.

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Problem:

Fountain solution is too hot in pans.

Solution:

Maintain fountain solution temperature in press pans at 65°F (18°C).