Introduction of Gravure Printing Technology for Banknotes

The Daqing Banknote Printing Coupon printed by the Printing Department of Daqing Branch in 1910 was the first set of engraving and intaglio banknotes issued by China. The carved part was completed by the American engraver, Haiqun. The phrase “no coin, no coin” was The world is widely circulated.

Gravure printing, gravure printing is a traditional way of printing banknotes. The inked area of ​​the printing plate is concave. The ink in the concave lines is directly transferred to the paper under strong pressure. The ink appears on the paper. It is a three-dimensional state, so there will be a feeling of unevenness when you touch it with your hand. The group on the banknotes is mainly made by hand-engraving plates, exquisite figures, not only itself belongs to high-level art, but also has anti-counterfeiting features. Each sculptor has different styles and characteristics. This cannot be imitated. At present, there are many advanced copying and forgery techniques in the world, and it is still impossible to duplicate the identical banknotes for hand-carved works. Therefore, hand engraving and gravure printing are still common international anti-counterfeiting methods.
The manual engraver is one of the most crucial links in the printing of banknotes, so the difficulty is very large, and no one can tolerate the slightest mistake. The hand-carving tool is not a knife but a pen. The plate of the steel plate is slightly more Microsoft than the ordinary steel plate. When the engraver is working, he must hold a magnifying glass in one hand, a pen in one hand, and a little bit of a line on the steel plate. A small amount of mistakes will also be thrown away. Someone has calculated the number of points and lines on a banknote. An engraver must engrave a million dollars on a bank note. In addition to the intaglio printing, it is easy to cause fire and there are many kinds of them. Among them, the more common failures and exclusion methods are as follows:
1 ink overflow: the phenomenon of the phenomenon of full-print part of the ink to produce speckle pattern is mainly due to the ink viscosity is too low, the ink is too fluid, the printing speed is low, the ink drying is too slow or static electricity. The exclusion method is to add the original ink and the adjusting agent to increase the viscosity of the ink to reduce the fluidity, and also to increase the printing speed or change the angle of the doctor blade.
2 The ink is dried in the plate and embedded: the ink is dried too fast causing the ink to dry in the plate. Caused by the buried version of more reasons, such as large ink pigment particles, foreign matter mixed in, ink fixative poor re-inking, ink viscosity is too high, the printing plate ink hole is too shallow and so on. The elimination method is to reduce the drying speed of the ink and increase the solvent amount of the ink to improve the re-dissolving property of the ink. Removing the foreign matter reduces the viscosity of the ink and also prevents the hot air of the drying device from blowing onto the plate, causing the ink in the plate to dry.
3 Blind lint of printed matter: Mainly due to the static electricity caused by the removal of substrates and inks. Increase the humidity of the substrate or add polar solvents in the ink, adjust the viscosity of the ink, and appropriately increase the printing speed.
4 poor print gloss: adding the right amount of raw ink can also properly increase the drying speed of the ink to replace the high-quality printing materials.
5 bad stacking color: The ink ink film that prints first has the reason that the ink is discharged is caused by the superposition of each ink's viscosity does not match the superposition ink to use the ink to dry the speed does not match can reduce the ink viscosity to slow down the superposition ink the drying speed.