About sublimation offset lithography

Sublimation offset lithography commonly used PS plate, on the lithographic printing plate, graphic part and blank part without significant high and low points, almost in the same plane, but have different surface properties, blank part is aluminium oxide, with good hydrophilic properties, and graphic part is high polymer material, water can not be attached. When printing, first, supplying wetting liquid to the plate by water rollers (main ingredient is water), make the blank part of the adsorption of water and form a infiltration of water film to resist offset ink, and then the ink roller to the plate supplying sublimation offset ink, using the repel principle of oil and water, the graphic part is adhesion sublimation ink, but the blank part is not absorption ink, and then applying pressure that will the graphic part of the ink is transferred to the substrate surface by the blanket cylinder.