The gravure printing machine is printed by circular pressing and direct printing. When printing, the full plate of the plate cylinder is inked, and the ink of the blank part of the plate is scraped off by the squeegee to leave the ink of the graphic part, and then the paper is passed. The impression cylinder is embossed on the back side of the paper, so that the ink of the concave portion is directly transferred to the paper surface, and finally the printed matter is piled up or rewinded through the delivery portion.
The main structure of gravure printing machine consists of five parts: paper feeding, ink feeding, printing, drying and delivery.
1. For the paper feeding part, the sheet-fed gravure printing machine is a paper-stack type continuous feeding, and the web-paper gravure printing machine is continuous feeding with a web.
2. The arrangement of the plate cylinder and the impression cylinder in the printing part is vertical, horizontal and inclined, and the plate cylinder is arranged below. Generally, each unit has a plate cylinder and an impression cylinder. In order to increase the printing pressure, some are equipped with two impression cylinders.
3. The ink supply device has a direct ink supply for immersing the plate cylinder portion in the ink tank and an indirect ink supply for transferring the ink to the plate cylinder by the ink discharge roller immersed in the ink tank, and some of the high speed machines are also sprayed. Ink mode.
4. The drying part is hot air heated by electricity or steam, and some use infrared or far infrared light to make the printed matter dry.
5. In the delivery section, the gravure printing machine sheet is stacked into a stack of paper, and the web is stacked or folded into a paper roll. There are two types of structure, the organic type and the satellite type, in the printed part of the web multicolor gravure printing machine.
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