Definitions

In requirements, guidelines and recommendations the terms swelling, odour and migration are mentioned. These will be explained below.

The exact definition of swelling and odour formation can be found under inks for cigarette packaging. The inks we use for food packaging are in principle low in swelling, migration and odour.

Concerning migration there are in general two different kinds to distinguish:

Permeation of components through the substrate

Invisible set-off:

Contamination of the inner side of the substrate with ink and/or coating caused by contact with the printed side.