On-Press Imaging for Offset Printing

The desire for short run printing and less skilled operators is generating interest in on-press imaging. On-press imaging requires daylight operation and no chemical processing, whereas most approaches are based on thermal (I.R.) technology. Imaging on-press requires special considerations due to press RPM limitations and other factors. The two main current approaches are imaging plates on the press (e.g. Heidelerg Quickmaster DI) or a reusable plate (e.g. MAN-Roland DICO technology). Other technologies are being developed such as spray-on switchable polymers. The technology of the imaging heads and the materials involved in the imaged layer will be discussed.