There are many types of printing machines, which can be classified in the following five aspects: printing machinery
, lithographic printing machine, gravure printing machine, stencil printing machine;
2. According to the size of paper, it is divided into: lithographic paper or sheet-fed printing machine, web-fed printing machine;
3. According to the number of printing colors, it is divided into: single-color printing machine, two-color printing machine, multi-color printing machine;
Eight open printing presses, four open printing presses, folio printing presses, full sheet printing presses, super full sheet printing presses, etc.;
5. Although there are many classification methods of printing presses, printing The core part of the machine is the embossing mechanism of the printing device. Therefore, according to the method of applying pressure, the general printing machine is divided into flat flat type, round flat type, round flat type, and oblique flat type.
The main feature of the gravure printing machine is that the graphic part on the printing plate is concave and the blank part is raised, which is exactly the opposite of the layout structure of the letterpress printing machine. When the machine is printing a single color, the printing plate is first dipped in the ink tank and rolled, and the entire surface of the printing plate is then covered with ink printing mechanical layer. Then, the ink layer that belongs to the blank part of the surface of the printing plate is scraped off, the convex part forms a blank, and the concave part is filled with ink, and the deeper the concave part, the thicker the ink layer. The machine transfers the ink of the recessed part to the printed matter through the action of pressure, thereby obtaining the printed matter.
