Poor Trapping

Problem:

Ink tacks out of sequence.

Solution:

Make sure inks are of proper successively decreasing tack. In some situations, when a K, C, M, K rotation is used, the black ink may be lower in tack so as to eliminate or minimize picking.

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Problem:

Ink strengths are improperly balanced. This can result in running one color heavy and the following color light, in which case the second or light color may not trap.

Solution:

Reduce strength of ink if it is running too light and carry a heavier ink film. Consult a Sun Chemical representative.

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Problem:

Ink/water is not in balance.

Solution:

Achieve and maintain proper ink/water balance. Running a minimum amount of ink and water is the preferable procedure.

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Problem:

Previous ink film is too heavy. If possible, previous colors should never run heavier than succeeding colors.

Solution:

Run a thinner film, increasing ink strength accordingly. Be aware that, if not done properly, this may cause balance problems as indicated.

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Problem:

Ink contains too much slip agent or other additives. Subsequent layers of ink may refuse to trap properly.

Solution:

Consult a Sun Chemical representative.

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Problem:

Ink stability curves out of balance.

Solution:

Consult a Sun Chemical representative.