Decryption stamp printing
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
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The printing of stamps mainly uses gravure printing, which is because the gravure printing has better anti-counterfeiting. It is widely used in anti-counterfeiting printing. Gravure printing is characterized by a large amount of ink. Therefore, the thickness of the gravure printing line and the shade of the ink are varied. The graphic has a concave and convex feeling, various layers, clear lines, and easy identification, which brings great difficulty to counterfeiting. Gravure is the first printing technology used in the field of anti-counterfeiting.
In terms of stamp printing, China's hand-engraved gravure technology is world-class. The hand-carved knife style and artistic style are unmatched by other plate making methods. The portraits of Chinese and foreign banknotes have always been hand-carved, and hand-carved to express the characteristics of the characters. The hand-carved deep-printed product has a thick ink layer, good hand feeling and strong anti-counterfeiting. However, there are two problems in hand-carving. Firstly, it is inefficient and not suitable for rapid production. In addition, because the hand-engraving must use a knives, the engraved stencil is a "V" shaped groove in the depth direction. The ink storage property of the groove of this shape is not so good. If the concave method is used, the ink in the groove is easily wiped out, and the ink layer of the printed line is not sufficiently thick and thick. This is two issues that must be solved. In solving the problem of efficiency, when carving portraits abroad, the portrait is enlarged and the image is enlarged and corroded. After the manual carving, the enlarged portrait copper plate is used as a template; using this template as a mold, the shrinking machine is used to shrink on the steel plate. Engraving portraits that meet specifications.
Sensible heat, engraving copper plate is easier and more efficient than directly engraving steel plate. As for solving the "V" shape of the groove, it is necessary to exploit the potential of the etching gravure process. The etching gravure process directly etches a single-open graphic film on a copper plate coated with a photosensitive material. The hardness of the copper plate is low, and other high-hardness plates can be pasted on the back of the copper plate. Or charge a layer of copper on a harder lining. The copper plate which has been treated with improved strength after being single-opened is pressed on a 1mm-thick plastic plate by a hot press, and the plastic plate is made into a large plastic plate by precision cutting and high-frequency welding, and a large plastic plate is used. The copper plate is flipped, the copper plate is re-turned to the nickel relief plate, and the nickel intaglio plate is finally available for use on the machine. The intaglio plate made by this etching process has a U-shaped groove, and has good ink-storing performance, and the printed product line has a thick ink layer and strong hand feeling. Moreover, the etching method can make small texts and very thin lines. Now the miniature text size can be 150μm, so that the small gravure micro-text can only be seen under the magnifying glass, and it is clearly visible.
The gravure invisible image made by the etching method has good refractive index and obvious color change. At the same time, the gravure method of this method solves the problem of the ink storage amount of the gravure pattern, and also solves the problem of low efficiency of hand engraving. However, in the large version of the corrosive method, it is necessary to use the process of imposition, electroplating and multiple piracy to make the printing plate. This also has the problem of inefficiency. To solve this problem, people have been exploring whether to use the etching method. The technical problem of directly making a gravure on the machine.