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The graphic part of the lithographic printing plate in the gravure printing machine is almost in the same plane as the non-graphic part. At the time of printing, in order to make the ink distinguish the graphic part or the non-graphic part of the printing plate, The non-graphic portion of the printing plate is supplied with water from the water supply means of the plate member so as to protect the non-graphic portion of the printing plate from being wetted by the ink.
Then, the ink is supplied to the printing plate by the ink supply means of the printing means. Since the non-graphic portion of the printing plate is protected by water, the ink can only be supplied to the graphic portion of the printing plate. Finally, the ink on the printing plate is transferred to the blanket, and then the pressure between the blanket and the impression cylinder is used to transfer the ink on the blanket to the substrate to complete the printing. Therefore, lithography is a kind of Indirect printing method.
This is the gravure printing press in the introduction of lithography.
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