October, 2013 | Proofing.de

Heatset and coldset? What’s the difference?

May 8, 2020October 19, 2013 by Matthias Betz

Nowadays, two different processes are used in web offset printing: heatset and coldset.

The coldset process is mostly used to print newspapers and paperbacks, with the printing ink drying purely by absorption.

In the heatset process, the paper is passed through a large dryer and a chill roll unit after the last printing unit. The length of the printing press is almost doubled by these two units. To ensure that the ink dries optimally, special heat-drying inks are used here.

ISO12647… and then what? On the further development of the ProcessStandard Offset Printing

April 19, 2014October 18, 2013 by Matthias Betz

Fogra is currently working with great commitment on modernising ISO 12647 and adapting it to current environmental conditions.

Important innovations of the reformed ISO 12647 will be:

Innovations regarding paper types (PT)
New tone value increases
For proofing: New papers with optical brighteners

Why is ISO 12647 being revised? Environmental conditions have changed significantly at three central points since the last revision in 2004.

What is Moiré? And can I see Moiré in a proof?

May 8, 2020October 15, 2013 by Matthias Betz

The Moiré effect, or in other words a halftone screen overlay, is a common phenomenon when viewing prints. It occurs when two even patterns overlap unevenly.

When does Moiré appear?

Moire is always created when screens overlap. Typical examples:

You have scanned in a newspaper ad and print it in another newspaper.
You print the portrait of a managing director wearing a jacket with a fine houndstooth pattern, a checkered shirt and a finely patterned tie. Regardless of the printing process, complete moiré chaos is guaranteed to break out here.
A brick building is reproduced in offset printing.
The photograph of a ventilation grille is viewed on a monitor
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