The printing process of the gravure printing machine is mainly that first, the entire layout of the plate cylinder of the gravure printing machine needs to be inked, and then the ink of the blank on the printing plate is scraped off with a squeegee, as long as the ink of the graphic is left, the paper is passed once. The embossing cylinder is then used to imprint on the reverse side of the paper, the depressed ink is directly printed onto the paper, and the paper is finally stacked or rolled up with the printed product.
The finished products of the gravure printing machine have the advantages of solid ink dyeing, obvious layering, strong stereoscopic effect and excellent printing quality. Most of them use gravure printing machines to print exquisite color patterns, trademarks of commodities, bank securities and colored newspapers.
However, the gravure printing machine also has the disadvantage that its plate making process is poor, the cycle is long, and the finished product contains more benzene ink, which causes great pollution to the environment, so it has not been widely used in China. Therefore, measures such as improving the plate making process of the gravure printing machine, shortening the plate making cycle of the gravure printing machine, printing with non-polluting ink, fundamentally reducing energy consumption, and reducing the cost of the gravure printing machine are still under discussion.
The main feature of the gravure printing machine is that the pattern on the printing plate is concave, and the blank space is convex, which is exactly the opposite of the layout of the letterpress printing machine.
When printing a single color, the gravure printing machine first rolls the printing plate in the ink tank of the gravure printing machine, and waits until the entire printing plate surface is covered with the ink layer. Then, the blank ink layer on the outer surface of the gravure printing machine is scraped off, and the raised area will form a blank area, and the recessed place will be filled with ink, and the deeper the recess is, the ink is relatively inked. The thicker the layer will be. The machine mainly transfers the recessed ink to the printed matter by a pressure effect, thereby obtaining a printed product.
Gravure printing machine generally uses overprinting method or some direct ink application method when printing multi-color, ink of various colors is distributed on each surface of printing plate according to need, printing principle of multi-color printing and printing monochrome of gravure printing machine It is actually the same. There are two main types of printing plates used in gravure printing machines. One is the gravure, which is the photocopying version, and the other is the engraving version. The engraving version is also subdivided into manual engraving, mechanical engraving and electronic engraving.
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