Detailed explanation of high-end Chocolate Boxes printing plate making process

Sep 27, 2021

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Summary:

Bump printing is a special printing process that does not use ink in the range of plate printing. On the printed matter printed with pictures and texts, two concave-convex plates are made according to the pictures and texts, and then embossed with a flat-pressing press, so that the surface of the printed matter is embossed and produces a unique artistic effect. So it is also called "rolling bumps", this method is similar to "arching flowers".

　　 One, the production of embossing plates

　　 Firstly, distinguish the primary and secondary levels of the drawing, take the subject performance as the theme, use the depth levels to reach a certain depth, and then consider the secondary levels. The prominent main part should make the protrusion height higher. The printing plate is first made into intaglio, using the engraving process, which can be wood engraving, copper engraving, steel engraving, and corrosion. Secondly, determine the expression method of graphics and lines. The main body and the general level should be coordinated. The depth and shallowness of the layout It must be coordinated. The outline of a picture must go from shallow to deep, and have a certain slope. The engraving of the drawing is based on the principle of perspective and the expression of near, deep, and shallow. Finally, after the outline is engraved, it is finely crafted to make the entire layout smooth and even. Run.

Glue the engraved intaglio plate to the center of the metal bottom plate of the flat-bed press, and level the printing plate to prevent unbalanced pressure, unsteady pressure or plate-off phenomenon, and stick yellow cardboard on the platen , To correct the pressure, according to the different depths of the parts with more uneven contours, press yellow cardboard to press the size of the printing surface and cut into pieces of paper to paste, forming the same trapezoidal punch as the intaglio. At this time, the details of the trapezoidal punch are not the same The intaglio is the same. A layer of gypsum slurry is laid on the trapezoidal punch. The gypsum slurry is mixed with fine gypsum powder and glue to make it. The consistency should be appropriate. Cover the gypsum slurry with a thin piece of paper. Perform it when the plaster is dry. In order to prevent the gypsum from sticking to the pressure test, a layer of kerosene can be applied to the intaglio plate. It is used to gently shake the machine during pressure test, and the speed should be slow at the beginning to avoid the rapid spread of the gypsum layer and the formation of mismatch between the intaglio and the relief. After the plaster is dry and set, it can be imprinted at normal speed. If there is any part that does not meet the quality requirements of the first-time pressed graphics, the plaster layer needs to be repaired, and the excess plaster on the non-imprinted surface should be scraped off with a knife when the plaster is not dry.

　　 Two, embossing with embossing

　　When printing, place the printed matter between the intaglio plate and the relief plate, and apply greater pressure to roll out the concave-convex pattern. In the process of embossing, if excessive pressure occurs or the unevenness of the paper is too deep, the paper can be worn evenly with sandpaper on the plaster surface. In the embossing process, the embossing surface should be cleaned frequently to prevent dirt from being pressed into the printed surface. When the quality of the printing paper is relatively hard and the quality of the product is very high, hot pressing can be used, that is, a resistance wire is added in the middle of the metal bottom plate, and the current is passed through in the work to make the printing plate heat, and then high-quality products can be pressed.

https://www.minongpackaging.com/paper-box/chololate-paper-box/lid-top-boxes-for-chocolate.html