Nowadays, various new anti-counterfeiting technologies are emerging one after another. The key to anti-counterfeiting technology is to extend the timeliness and uniqueness of anti-counterfeiting technology, and it is also the main purpose of anti-counterfeiting technology. Now the anti-counterfeiting technology mainly includes: anti-counterfeiting of printing design, anti-counterfeiting of printing paper, anti-counterfeiting of printing ink and anti-counterfeiting of printing process. Among them, the development of printing ink anti-counterfeiting technology is very good, and the application range is increasingly wide.
1. Anti-counterfeiting principle of achromatic ink
The so-called anti-counterfeiting ink is a special printing ink which is processed by a special process by adding a special performance anti-counterfeiting material to the ink binder. Anti-counterfeiting inks are mainly classified into the following types according to their anti-counterfeiting functions:
1 magnetic security ink
2 fluorescent ink and phosphorescent ink
3 reaction color ink
4 anti-altering ink
5 daylight excitation color ink
6 smart security ink
7 infrared ink
8 nanometer ink
Among them, the reaction color changing ink is an important part of the anti-counterfeiting ink, and can be further divided into: a thermochromic ink, a photosensitive color changing ink, a humidity sensitive color ink, a pressure sensitive color ink, and the like. Reactive color-changing inks are chemical substances that are added to the ink under certain conditions (such as light, heat, humidity, pressure, etc.), and various chemical reactions can occur, so that the ink changes color and achieves anti-counterfeiting purposes.
2, the classification of achromatic ink
1 water erasing ink
Water-decoloring ink is also known as moisture-sensitive ink. The principle of anti-counterfeiting is that the coloring material contains a color change with humidity. The water or bleach can be used to eliminate color, which is generally a water-soluble substance containing an oxidizing agent or a reducing agent. The anti-counterfeiting feature is that the dry state is colorless and the wet state becomes colored. The water-eliminating ink is further divided into reversible achromatic, irreversible achromatic, and moisture-sensitive diffusion, and has four colors of blue, green, black and red.
◠Reversible achromatic ink: After dripping, the color changes from colored to colorless. After evaporation, the original color is restored. The color is white → no, only silk screen, gravure. For silk screen printing, it is recommended to use 200 mesh screen printing. The thicker the better.
◠Irreversible achromatic ink: oily ink, from colored to colorless after dripping, the color does not return to the original color after the water droplets evaporate, the color is black → no, red → no, blue → no, green → no. Only silk screen printing, gravure printing, printing is required to be thinner, bright colors, good fading effect, such as silk screen printing is recommended to use 350-420 mesh screen printing.
â—The humidity-sensitive diffusion is irreversible, and the colors are red, yellow, blue, green, etc., and can only be printed by water-based screen printing.
2 organic solvent decolorizing ink
For example, alcohol, gasoline, benzene, etc. The principle of discoloration of organic solvents and discoloration of water is fundamentally uniform, and it is discolored according to the mutual reaction of the corresponding chemical substances.
3 composite achromatic ink
The combination of water-eliminating ink and organic solvent-eliminating ink can be called composite achromatic ink. The composite decolorizing ink can react to aqueous solvents, bleaching and organic solvents to achieve the purpose of color reduction. Composite decolorizing ink is the trend of anti-counterfeiting ink development. Composite anti-counterfeiting ink can not only prolong the service life of anti-counterfeiting ink, but also improve anti-counterfeiting effect.
4 binary security ink
The binary anti-counterfeiting ink means that the decolorizing ink contains a fluorescent component, and it is easy to distinguish whether or not the solvent has been used under the irradiation of ultraviolet rays. Part of the faded ink contains visible fades and has a permanent fluorescent component. Under visible light, it does not seem to exist, but it can be observed by the human eye after being irradiated with ultraviolet rays.
Nowadays, various new anti-counterfeiting technologies are emerging one after another. The key to anti-counterfeiting technology is to extend the timeliness and uniqueness of anti-counterfeiting technology, and it is also the main purpose of anti-counterfeiting technology. Now the anti-counterfeiting technology mainly includes: anti-counterfeiting of printing design, anti-counterfeiting of printing paper, anti-counterfeiting of printing ink and anti-counterfeiting of printing process. Among them, the development of printing ink anti-counterfeiting technology is very good, and the application range is increasingly wide.
1. Anti-counterfeiting principle of achromatic ink
The so-called anti-counterfeiting ink is a special printing ink which is processed by a special process by adding a special performance anti-counterfeiting material to the ink binder. Anti-counterfeiting inks are mainly classified into the following types according to their anti-counterfeiting functions:
1 magnetic security ink
2 fluorescent ink and phosphorescent ink
3 reaction color ink
4 anti-altering ink
5 daylight excitation color ink
6 smart security ink
7 infrared ink
8 nanometer ink
Among them, the reaction color changing ink is an important part of the anti-counterfeiting ink, and can be further divided into: a thermochromic ink, a photosensitive color changing ink, a humidity sensitive color ink, a pressure sensitive color ink, and the like. Reactive color-changing inks are chemical substances that are added to the ink under certain conditions (such as light, heat, humidity, pressure, etc.), and various chemical reactions can occur, so that the ink changes color and achieves anti-counterfeiting purposes.
2, the classification of achromatic ink
1 water erasing ink
Water-decoloring ink is also known as moisture-sensitive ink. The principle of anti-counterfeiting is that the coloring material contains a color change with humidity. The water or bleach can be used to eliminate color, which is generally a water-soluble substance containing an oxidizing agent or a reducing agent. The anti-counterfeiting feature is that the dry state is colorless and the wet state becomes colored. The water-eliminating ink is further divided into reversible achromatic, irreversible achromatic, and moisture-sensitive diffusion, and has four colors of blue, green, black and red.
◠Reversible achromatic ink: After dripping, the color changes from colored to colorless. After evaporation, the original color is restored. The color is white → no, only silk screen, gravure. For silk screen printing, it is recommended to use 200 mesh screen printing. The thicker the better.
◠Irreversible achromatic ink: oily ink, from colored to colorless after dripping, the color does not return to the original color after the water droplets evaporate, the color is black → no, red → no, blue → no, green → no. Only silk screen printing, gravure printing, printing is required to be thinner, bright colors, good fading effect, such as silk screen printing is recommended to use 350-420 mesh screen printing.
â—The humidity-sensitive diffusion is irreversible, and the colors are red, yellow, blue, green, etc., and can only be printed by water-based screen printing.
2 organic solvent decolorizing ink
For example, alcohol, gasoline, benzene, etc. The principle of discoloration of organic solvents and discoloration of water is fundamentally uniform, and it is discolored according to the mutual reaction of the corresponding chemical substances.
3 composite achromatic ink
The combination of water-eliminating ink and organic solvent-eliminating ink can be called composite achromatic ink. The composite decolorizing ink can react to aqueous solvents, bleaching and organic solvents to achieve the purpose of color reduction. Composite decolorizing ink is the trend of anti-counterfeiting ink development. Composite anti-counterfeiting ink can not only prolong the service life of anti-counterfeiting ink, but also improve anti-counterfeiting effect.
4 binary security ink
The binary anti-counterfeiting ink means that the decolorizing ink contains a fluorescent component, and it is easy to distinguish whether or not the solvent has been used under the irradiation of ultraviolet rays. Part of the faded ink contains visible fades and has a permanent fluorescent component. Under visible light, it does not seem to exist, but it can be observed by the human eye after being irradiated with ultraviolet rays.
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