working method of gravure printing machine
The main feature of the gravure printing machine is that the graphic part on the printing plate is concave and the blank portion is convex, which is opposite to the layout structure of the letterpress printing machine. When the machine is printing a single color, the plate is first immersed in the ink tank to roll, and the entire surface of the printing plate is coated with the ink layer. Then, the ink layer on the surface of the printing plate which is a blank portion is scraped off, the convex portion forms a blank, and the concave portion is filled with the ink, and the deeper the recess, the thicker the ink layer. The machine transfers the ink of the recessed portion to the printed matter by pressure to obtain a printed matter.
When printing multi-color, the overprint method or the indirect partial ink application method is adopted, so that the inks of various colors are distributed on the relevant parts of the surface of the printing plate according to the needs, and the basic printing principle of printing multi-color is the same as the printing monochrome.