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The main characteristics of gravure printing machine: the graphic part of the plate is concave, and the blank part is convex, which is just opposite to the layout structure of gravure printing machine. When printing monochrome, the machine first immerses the printing plate in the ink tank to roll, and then the whole printing plate surface is covered with ink layer. Then, the printing plate surface belongs to the blank part of the ink layer is scraped off, the convex part forms a blank, and the concave part is filled with ink, the deeper the concave part is, the thicker the ink layer is. The machine transfers the ink of the concave part to the printed matter through the action of pressure, so as to obtain the printed matter. When printing multicolor, overprint or indirect local inking method is adopted, so that the inks of various colors are distributed on the relevant parts of the plate surface according to the needs. The basic printing principle of printing multicolor is the same as that of printing monochrome. There are mainly two kinds of plates used in gravure press. One is photographic gravure, that is, photogravure; The other is engraving. The engraving of engraving plate includes manual engraving, mechanical engraving and electronic engraving.

Advantages of gravure printing machine: it has thick ink layer, rich layers, strong three-dimensional sense and good printing quality. It is mainly used for printing exquisite color pictures, trademarks, decoration products, securities and color newspapers. Gravure printing press has not been widely used in China due to its complex plate making process, long cycle and environmental pollution caused by benzene ink.

When the gravure press is printing, the whole plate is inked by the plate cylinder. The ink of the blank part on the plate is scraped off with an ink scraper to leave the ink of the graphic part. Then, the ink is passed through the paper and imprinted on the back of the paper by the embossing cylinder, so that the ink of the concave part is directly transferred to the paper surface. Finally, the printed matter is stacked or rewound by the paper receiving part. Therefore, it is necessary to improve plate making process, shorten plate making time, use pollution-free ink, reduce energy consumption and cost.

The use of this printing machine greatly improves the efficiency of printing work. But this kind of printing machine is still less used in China. When using this kind of printing machine, we should pay attention to ventilation and exhaust, and don't let the machine get wet, so as to avoid electric leakage. Don't put your hands into the machine during operation. This kind of machine will also break down. At this time, you should consult or ask professional personnel to come to maintain. Pay attention to cut off the power supply and heat source during maintenance. In any case, safety should come first.