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Backtrapping/Contamination

Problem:

Heavy ink films/densities in prior units are increasing the opportunity for poor trapping.

Solution:

Lower densities of prior colors and increase density of latter units or change rotation. Lower the tack of the ink, if necessary, with 2-5% gelled reducer.

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Problem:

Paper may have high hold out (low absorption).

Solution:

This prevents the inks from setting into the paper and tacking up between units, leading to poor trapping and tacking up between units.

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Problem:

Blankets are not releasing ink well.

Solution:

Check blanket compatibility with ink system. Change blanket.

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