Printing principle on a TD3 press
Three-colour intaglio rotary printing machines (TD3 presses), developed by Louis Chambon in 1929, allow to print at most three colours during one turn of a plate cylinder thanks to three ink reservoirs. The plate cylinder is made of 3 printing cylinder parts (in brass or steel) screwed on the printing cylinder. Ink is transported on the part of the engraving to be coloured by a plastic roller (called the touch roller), the circumference of which is equal (…)