Offset printing is an indirect flat printing process. The printing forme comprises a right-reading aluminium plate with both printing and non-printing elements on one surface. Colour is first transferred from the plate to a rubber pad and then onto the material being printed.

The STI Group uses 5 and 6 colour machines with 1 or 2 coating units.The format classes run from half-sized (500 x 700mm) to VIIb (1200 x 1620 mm). All machines are equipped with colour control equipment. Powerful driers ensure powder-free printing.