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You have to know. Production technology of Chinese gold and silver commemorative coins
- Apr 13, 2018 -

The production of commemorative coins is the creative process of coin art, over the past more than 20 years, many new coinage technology, new technology has been operating to the commemorative coins, not only sandblasting, mirror and other traditional processes have been widely and new applications, and mosaic, abnormity, color, invisible engraving, laser holography, bimetal, imitation of the old and oblique teeth, ink anti-counterfeiting and other new technologies, The new process has been developed and applied, and the quality level and ornamental value of commemorative coins have been improved.


Flat bottom Mirror: 

Gold and silver commemorative coins of the bottom plane should be highly flat and bright as a mirror, so that its pattern and bottom of the contrast more intense, more distinct levels. Mainly through the stamping die plating hard chrome after grinding, polishing and other methods to obtain. Most of China's gold and silver commemorative coins are used in this process


Sandblasting Frost: 

The use of different mesh of sand (or metal pill) on the selected bottom or pattern sprayed into the matte surface, forming a frost effect, increase the sense of three-dimensional and layered graphics and text. Like the mirror technology, most of China's gold and silver commemorative coins are used in this process


Anti-sandblasting: 

is in the original relief or text sandblasting part of the use of bright industry, and the bottom of the coin sand blasting process treatment, so that a completely different process of another effect.


Abnormity: 

Traditional mechanism coins are mainly round, and most metal coins have continuous silk teeth on the sides. Few are flat-edged without silk teeth. Later, people were rich in metal coins, at the same time, in order to improve the difficulty of making coins, increase the anti-counterfeiting technology content of coins, developed a non-circular coins, from the three-side line to more than 10 sides have, but the shape used in circulation coins mainly have seven sides, ten-side shape. For the manufacture of coins, silver coins, copper coins of the different currencies have three-side line, rectangular, annular, fan-shaped, oval, basin-shaped and inlaid and so on. Chinese gold and silver commemorative coins for the embodiment of innovation and performance of special themes, the use of rectangular, fan, plum, polygon and other shapes


Round punch: 

Strictly speaking, the round punch currency also belongs to special-shaped coins. As of 2008, there were not many countries in the world that made metal coins by means of circular middle hole drilling.


Side of the word: 

As the name suggests, is in the metal coin side of the cylinder surface on the roll on a variety of text and graphics, this text and graphics (also known as Benming and side adorn) can be embossed (protruding), can also be engraved (concave). The edge of the metal coin roll up the character, on the one hand enhance the appreciation of the coin, on the other hand also improve the technical content of the coin. Because the edge of the coin processing technology is more complex, which makes counterfeit money to increase the technical difficulty. This technique has also been applied to some of China's gold and silver commemorative coins in recent years


Continuous helical teeth: 

Usually the edge of the metal coins of the continuous silk teeth with the coin shaft is perpendicular to each other. The continuous helical tooth has a staggered angle with the coin's shaft diameter. Because of this angle, this gives the metal coins imprint printing has brought great difficulties, but also to the traditional coinage printing process challenged.


In other words, increase the difficulty of making coins, improve the technical content and security of coins, as of 2008, the world used this technology to make coins, very few countries, China has in 2001 to apply this technology to some gold and silver commemorative coins. Double metal Mosaic: is the two different color of the metal using a combination of the method of casting a new effect of metal coins, it has two parts: outer ring and inner core, it came out, the National Mint has been the full attention and welcome. The so-called local mosaic (or partial plating), is a single metal coin in a local pattern with mosaic or coating technology to combine another metal


Color: 

The rise of color gold coins was in the mid 1990s, it is a special printing process technology in metal coins printed color images.  Because it broke the traditional metal coins of the single color, so that gold and silver commemorative coins appear colorful, colorful, so that the coin characters, flowers lifelike, theme design more prominent vivid.       

Electroplating: 

In accordance with the design and aesthetic requirements of commemorative coins, on the selected part of the currency or all the patterns on the plating of other metals.            

 High relief: 

This is relative to the traditional shallow relief, the use of higher relief to show the level of commemorative coin patterns.              

  Boundless: 

The elimination of commemorative coins on the surface of the traditional clear edge, for the performance of special effects.        

Imitation of the old: 

the use of vulcanization process to treat the surface of silver coins, so that the dark black coin effect. Gravure: This is the Chinese coinage created by the unique carving method, that is, the use of metal refraction principle, in the relief of the coin on the use of concave carving method, in order to show the black and white Panda fur gold and silver color, to solve the traditional mirror sand blasting process difficult to show refraction effect of the problem