Offset printing process and corresponding apparatus

A dry offset printing process using a dry offset printing apparatus including a) at least one inker block for transferring ink to a relief plate corresponding to one color of a final motif to be reproduced on an object and including an inker and a succession of transfer rollers, b) a central rubber blanket mounted on a rotatable drum and in contact with a relief plate in such a way that upon each rotation of the blanket, one complete decoration is transferred to the blanket, c) means for placing the central blanket into contact with a drum bearing an object to be decorated, and d) means for transferring the objects before and after decoration, comprising the steps of:

• 1) regulating ink temperature in the inker to a predetermined temperature between 15.degree. and 30.degree. C.;
• and
• 2) using an ink with tackiness adapted to a job on the offset apparatus, the tackiness at the predetermined temperature of 15.degree. to 30.degree. C., corresponding to the temperature of the ink in the inker, being 3-5 times greater than the tackiness of the same ink after a temperature increase by 15.degree. to 25.degree. C., corresponding to a temperature increase of this ink in passing from the inker to the blanket.