Gravure

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Mottle

Problem:

Ink viscosity is too low.

Solution:

Increase ink viscosity.

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Problem:

Ink viscosity is too high.

Solution:

Reduce ink viscosity.

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Problem:

Paper stock is too dry.

Solution:

Introduce moist air.

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Problem:

Ink is not wetting stock properly.

Solution:

Change blade angle, then change solvent selection.

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Problem:

Ink or substrate is too cold

Solution:

Vary temperature of ink and substrate. Allow to warm to room temperature.

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Problem:

Pigment selection is poor.

Solution:

Reformulate ink.

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Problem:

Cylinder is too deep.

Solution:

Re-etch or replace cylinder.

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Problem:

Print impression is excessive.

Solution:

Reset for lighter impression.

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Problem:

Press returned ink is unusable.

Solution:

Increase resin solids. Use fresh ink.

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Problem:

Press speed is too low.

Solution:

Increase press speed.

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Problem:

Ink might be printing characteristics of substrate.

Solution:

Check alternate substrate for smoother surface.

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Problem:

Make sure solvent blend is correct for resin balance.

Solution:

Check solvents (blends) for accuracy – run GC.

Information about Sun Chemical

Sun Chemical offers a broad portfolio of inks, coatings, color software and brand color management for gravure printing.

Learn About Sun Chemical's Printing Solutions for Gravure