Dot Gain

Problem:

Rollers and pressures are improperly set

Solution:

Reset rollers and pressures.

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Problem:

Rollers or blankets are too soft.

Solution:

Condition or replace rollers or blankets.

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Problem:

Ink is low in viscosity and/or tack.

Solution:

Consult your Sun Chemical representative.

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Problem:

Ink color strength is too weak; ink film is too heavy.

Solution:

Consult your Sun Chemical representative.

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Problem:

Ink is too receptive to water.

Solution:

Consult your Sun Chemical representative.

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Problem:

Blankets are packed improperly or too much pressure exists.

Solution:

Check packaging and pressure.

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Problem:

Ink is piling.

Solution:

Consult piling section of this guide.

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Problem:

Plate is poorly desensitized.

Solution:

Consult your pre-press department.

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Problem:

Dampening system is dirty.

Solution:

Clean dampening system.

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Problem:

Fountain solution pH or conductivity is out of balance.

Solution:

Adjust pH and conductivity to manufacturer’s specifications.

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Problem:

Slurring or doubling occurs in halftone.

Solution:

Check cylinder pressures, blanket tension and roller slip-page. Check mechanical operation of unit.