It has also spent the nine months since Drupa optimising the ink feed, screening and colour management to improve print quality.

The polymer inks are designed to stop the pigments penetrating the paper fibres, providing more vibrant results and less strike through, and enabling the use of untreated paper.

The use of untreated paper allows for a wider range of finishes, and therefore applications, and also offers lower running costs.

"We have kept the promises we gave to those interested in the press at Drupa," said project manager Oliver Baar. "The RotaJet is now well prepared for daily print production."

An example of that was the production on the press of daily newspaper the Neue Luzerner Zeitung at the show. Other applications produced live included book block printing, with the blocks married to pre-printed offset produced cover on a Hunkeler line.