Decrypt the printing of stamps

The printing of stamps is mainly gravure printing, which is because gravure printing has better anti-counterfeiting. It is widely used in anti-counterfeiting printing. The characteristic of gravure printing is the large amount of ink used. Therefore, the thickness of the lines of the gravure printing and the change of the shades of the ink are rich. The graphics have a concave and convex feeling, the layers are diverse, the lines are clear, and they are easy to identify. Gravure is the earliest printing technology used in the field of anti-counterfeiting.

In terms of stamp printing, China's hand-carved gravure technology is world-class. The hand-carved knife style and superb artistic style are unmatched by other plate making methods. The portraits of banknotes in various countries at home and abroad have always been hand-carved, and hand-carved to express the characteristics of the characters in a unique style. The hand-engraved deep version prints the product with thick ink layer, good hand feel, and strong anti-counterfeiting. However, there are two problems with hand engraving. The first is low efficiency, which is not suitable for rapid production. In addition, because hand engraving must use a knife, the engraved pattern has a "V" shaped groove in the depth direction. This type of groove is not very good for ink storage. If the plate is wiped, the ink in the groove is easily wiped out, and the printed line ink layer is not full and thick. These are two problems that must be solved. In order to solve the problem of efficiency, when engraving a portrait abroad, the portrait is first enlarged by etching the enlarged image copperplate, and then the enlarged portrait copperplate is used as a template after manual carving; Engrave portraits that meet specifications.

Sensible heat, engraving copper plate is easier and more efficient than directly engraving steel plate. As for solving the problem of groove "V" shape, the potential of corrosion gravure process needs to be tapped. The corrosion gravure process is to directly corrode the single-open graphic film on the copper plate coated with photosensitive material. The copper plate has low hardness, and other high-hardness plates can be pasted on the back of the copper plate. Or you can charge and plate a layer of red copper on the harder lining. After the single opening is corroded, the red copper plate is processed with a hot press on a 1mm thick plastic plate. The plastic plate is precision cut and high-frequency welded to make a large plastic plate. The large plastic plate is used. Re-coated copper plate, copper plate and then nickel relief plate, and finally nickel intaglio plate can be used on the machine. The intaglio plate produced by this etching process has a "U" shape groove, good ink storage performance, and the product line has a thick ink layer and strong hand feeling. Moreover, by using the corrosion method, very small text and very thin lines can be made. Now the size of the miniature text can already be 150μm. Such miniature gravure text can only be seen clearly under the magnifying glass.

The gravure invisible image and text made by etching method has good refractive index and obvious color change. At the same time, this method of making gravure solves the problem of the amount of ink stored in the gravure pattern, and also solves the problem of low efficiency of manual engraving. However, the large-scale etching method also needs to adopt the processes of imposition, electroplating, and multiple copies to make the machine printing plate, which also has the problem of low efficiency. The technical problem of directly making gravure on the machine.

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