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. Then, the embossing cylinder is used to imprint on the reverse side of the paper, and the depressed ink is directly printed on the paper surface, and finally the papers are stacked or rolled up with the printed matter.
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 beautiful color patterns, trademarks of commodities, securities of banks 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 printing plate of the gravure printing machine is scraped off, and a blank area is formed in the convex place, and the recessed place is filled with the 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 multicolor, ink of various colors is distributed on each surface of printing plate according to needs, printing principle of multicolor printing of gravure printing machine and printing monochrome It is actually the same. There are two main types of printing plates used in gravure printing machines. One is gravure, which is a photocopying version, and the other is an engraving version. The engraving version is also subdivided into hand-carved, mechanical-engraved and electronic-engraved.
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