Method for folding and/or binding together paper webs.

摘要

For the production of a linear liquid application (4) on a substrate (3), for example a fold-assisting liquid application and/or a glue application, the position of the liquid application can be checked and the functioning of the application head (6) monitored in simple fashion if the application liquid contains pigments which are invisible under normal light and become visible when exposed to associated visualising means.