Compared with the traditional way of printing a large number of paper textbooks and test papers

develop

1, letterpress printing: the graphic content on the printing plate is raised, and the seal we use is raised. The raised words first contact the ink in the ink tank, then the printing plate contacts the paper, and the words are transferred to the paper.

2. Gravure printing: Contrary to relief printing, the text content is concave. When printing, the printing plate is inked in the ink tank first, and then the ink on the surface of the printing plate is scraped off with a scraper, so that only gravure ink (characters) is left on the printing plate, and then the printing plate contacts the paper, so that the ink is transferred to the paper.

3. Waxed paper printing: This is easy to understand, just like the painting we saw in our factory (spraying car license plate). The text content is hollowed out with a template, then covered with paper, the whole plane is sprayed with ink, and then the waxed paper is taken away. Then the hollowed-out part of the waxed paper is the part where the ink falls on the paper. This is the way to understand. Of course, in practice, the template is a whole piece, and the holes are silk mesh cloth of the same size, and then the mesh cloth needs to be sealed with a special solvent.

4, lithography: it is more difficult to understand without contact. The text and non-graphics on the printing plate are on the same plane, but the text part is compatible with the text, and the non-text part is repulsive to the ink. In this way, when the whole surface is in contact with the ink, the text part is contaminated by the ink, but the non-text part is incompatible with the ink, so there is no ink on the surface, and then the printing plate is in contact with the paper, so that the text is transferred to the surface of the paper.