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Metering Roller Build-up

Problem:

Fountain solution circulation system is contaminated.

Solution:

Drain, clean, flush, replace filters and refill with fresh fountain solution. Desensitize rollers.

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Problem:

Fountain solution mix is improper.

Solution:

Check pH, conductivity, Brix level and temperature. Ensure pan temperature is no higher than 65°F (18°C).

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Problem:

Automatic dosing systems are faulty.

Solution:

Check to make sure that doser is dispensing desired levels of chemistry (perform a “jug test”).

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Problem:

Rollers are set improperly.

Solution:

Check settings and the skew of the metering roller and reset to manufacturer specifications.

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Problem:

Roller durometer is wrong.

Solution:

Replace rollers with recommended durometer.

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Problem:

Pan roller is greasy or contaminated.

Solution:

Clean and desensitize the chrome roller with a good chrome roller cleaner and follow up with a hot water / white vinegar (2:1) wash-up.

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Problem:

Inappropriate solvents/washes used to clean metering rollers.

Solution:

Be sure to use metering roller cleaner (MRC).

Information about Sun Chemical

Sun Chemical offers a broad ink and coating product portfolio with a wide range of capabilities that include sheetfed inks, coatings, color software and brand color management.

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