2022-08-26 09:57
Anti-sandblasting: Anti-sandblasting is the opposite of mirror sandblasting, that is, the pattern was originally sandblasted with bright surface, and the bottom surface was originally changed to sandblasted with mirror. In this way, the reverse processing obtains another effect that is completely opposite, so that the commemorative coin finds a third color in the mirror and sandblasted surface (like adding gray in black and white), enriching the level of the commemorative coin picture and expanding the expressive ability.
Multi-level sandblasting: Multi-level sandblasting is the development of anti-sandblasting, which makes sandblasting more expressive, producing a gradual visual effect, just like the smudging technique in Chinese painting, making the whole picture more lifelike.
Invisible engraving: invisible engraving is the use of computer programming, the two patterns are processed and expressed on the two sides of the line, resulting in a technology that can see A pattern from a certain angle, and can see B pattern at another angle, which has certain processing difficulties and requires high-precision equipment, which can be used as a means of anti-counterfeiting.
Laser engraving: use the density of the laser engraved points to reflect the black, white and gray in the sketch, so as to basically reflect the three-dimensional and layered sense of the picture at the same plane level.
Microtext: It is a process technology that draws on money printing, using high-precision processing equipment to engrave very fine but very clear text on the mold, which is also an anti-counterfeiting means.
Secret note: It is a process technology that draws on money printing, that is, engraving a symbol or shape with certain special significance and not easy to detect in a special position of the commemorative coin pattern, as the basis for experts to identify authenticity.
Special-shaped coin: Special-shaped coin is a precious metal coin whose shape is non-round, such as plum blossom, rectangle, fan, hexagon, heart, ruyi, etc. With the enhancement of mechanical processing means, the shape of various special-shaped coins has become increasingly rich.
High relief: using multiple embossing and multiple annealing, the high relief can also be pressed, and finally the excess metal is removed by the method of the side of the car.
Gold and silver inlay: gold and silver inlay is to inlay gold and silver two precious metals, generally the inner core is gold, the outer ring is silver, the gold and silver two colors are combined, it looks magnificent.
Partial gold setting: Partial gold setting is developed from gold and silver inlay, which is only a partial gold sheet on a silver coin.
Holographic laser (also known as magic color): Holographic laser technology can also be called "Optically Variable Device" (O V D), which is obtained through mathematical analysis based on diffraction physics, and its purpose is to produce novel and special optical effects. It is mainly used to enhance the color of selected areas in the design of large patterns or to make them appear rainbow effect, and can also be used to reduce the chance of being counterfeited.
The filament teeth on the edge: The silk teeth on the edge of the general precious metal commemorative coin products are straight, and the new process of the helical wire teeth increases the means of anti-counterfeiting. To change the straight wire tooth to a helical wire tooth, the die ring of the helical wire tooth must be put into a special device, and the product can be demolded after a certain angle of rotation, which increases the difficulty of processing and makes it difficult for counterfeiters to forge.
Punching: use embossed gold and silver coins, and then flush out the square hole in the middle, replace the ancient coin casting method, imitate the ancient square hole money.
Vulcanization and aging: The finished silver coin after embossing is vulcanized on the surface, and then the black at the height of the relief is erased to obtain the artistic effect of ancient silver with a strong sense of relief.
Partial gold plating: After the silver coin is imprinted, the part of the pattern is gold-plated.
Color pad printing: is to the red, yellow, blue, black four color ink, the use of special printing plate transfer to the surface of precious metal products, it can not only pad print the entire pattern, but also can do partial pad printing, so that the pattern of the coin on the three-dimensional relief and flat printing combination, breaking the gold and silver commemorative coin single color limitations, so that the commemorative coin colorful, bright and eye-catching.
Color spraying: color spraying is also a technology applied to the production of gold and silver coins by drawing on the process technology of other industries, which overcomes the limitations of pad printing can only be printed on the plane compared with color pad printing, color spraying through special equipment, can be painted on the relief of coins, so as to obtain a strong sense of relief color printing effect.
Side rolling: The side scrolling of circulating coins or ordinary commemorative coins is generally rolled on the blank cake, and then embossed the product. The roller on the gold and silver coins is to first emboss the product, and then roll the word on the side of the product.
Material and weight: The precious metal commemorative coins issued by People's Bank of China comply with the "People's Republic of China Financial Industry Standards (Gold Coins, Silver Coins)" (gold coins JR/T0004-2000, silver coins JR/T0005-2000), mostly made of pure gold and pure silver, and the weight tolerances and dimensional tolerances are strictly controlled.
Article reprinted from: China Gold Coin Network