Concave and convex printing plate making process

Etched Pioneer embossed hot stamped version. With the development of the printing industry, people have higher requirements for packaging and decoration, and they require bright colors. In terms of layers, they not only need to reflect the light and dark levels of the plane, but also need to have a three-dimensional level. Make the product increase the level of three-dimensional sense.

Embossing printing is a special printing process without ink in the range of plate printing. On the printed matter printed with pictures and texts, two concave and convex plates are made according to the pictures and texts, and then embossed with a flat-bed printing machine, so that the surface of the printed matter is embossed and has a unique artistic effect. Therefore, it is also called "rolling bumps", which is similar to "arching flowers".

The process flow of embossing printing is as follows: production of embossing printing plate → embossing of embossing plate.

First, the production of embossed printing plate

First, distinguish the primary and secondary levels of the drawing, take the main expression as the theme, use the deep and shallow levels to achieve a certain depth, and then consider the secondary level, and the prominent main part should be raised to a higher height. The printing plate is first made into a gravure, which is carried out by the engraving process, which can be woodcut, copper, steel, and corrosion; secondly, the expression method of graphics and lines should be determined. The main body and the general level should be coordinated, and the depth of the layout and the shallow The outline of a picture should be coordinated, and the outline of a picture should be from shallow to deep, and have a certain slope. The engraving surface uses the principle of perspective and the expression techniques of near, deep and shallow; finally, after completing the outline engraving, it is finely cut to make the entire layout smooth and even. Run.

Stick the engraved gravure etched pioneer embossed version on the center of the metal base plate of the flatbed printing machine, and level the printing plate to prevent the pressure from being unbalanced, the pressure is not solid or the plate is out of shape. Glue the yellow board paper to correct the pressure. For the parts with more concave and convex contours, according to the depth, press the yellow board paper to cut the size of the printing surface and cut them into pieces of paper to paste to form the same trapezoidal punch as the gravure. At this time, the trapezoidal punch The details are not consistent with the intaglio. A layer of gypsum slurry is laid on the trapezoidal punch. The gypsum slurry is mixed with fine gypsum powder and glue. The consistency should be appropriate. Cover the gypsum slurry with a thin piece of paper. When it is still dry, perform a bump pressure test. To prevent the gypsum from sticking, you can brush a layer of kerosene on the gravure. It is used to shake the machine gently during the pressure test, and the speed should be slow at the beginning to avoid the rapid spread of the gypsum layer, resulting in the phenomenon that the gravure does not match the relief. After the plaster is dry and hardened, it can be stamped at normal speed. If the first extruded pattern does not meet the quality requirements, the gypsum layer needs to be repaired, and when the gypsum is not dry and hard, scrape off the excess gypsum on the non-imprinted surface with a knife.