Paper Packaging

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Poor Trapping

Problem:

First down ink is not dry due to improper ink or heavy ink film.

Solution:

Increase drying speed of the ink by:

  1. Reducing first down ink viscosity
  2. Reducing ink film with better metering
  3. Changing ink formulation for faster drying
  4. Decreasing machine speed
  5. Decreasing anilox volume

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Problem:

Second down ink is not covering due to low viscosity.

Solution:

Increase second down ink viscosity to higher than that of first down ink.

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Problem:

Second down ink is not printing due to the ink drying too fast.

Solution:

Slow drying by adding glycol or increase press speed.

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Problem:

Ink is not drying due to the high hold out of the substrate.

Solution:

Change substrate or reduce ink film thickness.

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Problem:

Second down ink is not compatible with the first down ink.

Solution:

Use a transparent ink and switch trapping sequence.

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Problem:

Second down ink is not printing due to too high or too low pH.

Solution:

Adjust pH or add fresh ink (non-pH stable inks only).

Information about Sun Chemical

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

Learn About Sun Chemical's Solutions for Paper Packaging