printing plate aluminum sheet/aluminum sheet printing technology
Unlimited number aluminum sheet used once as printing plates . Aluminum sheet has been gaining ground for a long time among the metal-based plates over zinc and steel. The necessary graining of the aluminum surface is done mechanically either by sand-blasting, ball graining, or by wet or dry brushing. Nowadays, practically all printing plates are grained in an electrolytic process (anodizing), that is, electrochemical graining with subsequent oxidation. Aluminum printing plates are used in offset printing of books, newspapers, fliers and other print media. These thin metal plates are etched with the image or text to be printed, inked and used to indirectly transfer that ink to the paper. These a luminum hot rolled plates cannot be re-etched. They must be melted down to make new plates or used for other purposes after printing has been completed. Some applications, such as newspaper printing, produce huge numbers of waste plates. Grade for printing plate aluminum ...