China's anti-counterfeiting printing technology (below)
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Third, anti-counterfeiting ink
The so-called anti-counterfeiting ink, that is, a special printing ink which is processed by a special process by adding a special performance anti-counterfeit material to the ink binder. The anti-counterfeiting inks currently developed and applied in China can be divided into 10 categories and elaborated separately. The specific implementation is mainly printed on the ticket, product trademark and packaging by ink printing. This type of anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright colors, convenient inspection (even hand temperature can change color), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries.
1. Ultraviolet fluorescent ink
It can emit visible light (400 ~ 800nm) special ink under ultraviolet light (200 ~ 400nm). According to the wavelength of the excitation light source, it can be divided into short-wave ultraviolet excitation fluorescent anti-counterfeiting printing ink (excitation wavelength 254nm) and long-wave ultraviolet laser fluorescent anti-counterfeiting printing ink (excitation wavelength is 365nm). According to the color of the ink, it is divided into two types: colored fluorescent ink and colorless fluorescent ink. Among them, the commonly used fluorescent materials are mainly classified according to their composition. First, the organic fluorescent material is an unsaturated molecule with a large conjugated body, mostly excited by sunlight, used for obvious color decoration, poor fluorescence stability, easy to oxidize and decompose; second, inorganic fluorescent material synthesized by high temperature is used The luminescent materials for fluorescent screens and fluorescent tubes have good radiation resistance and high stability, but are difficult to disperse in oily media. The synthesis is difficult and the water resistance is poor; and the chemically synthesized rare earth organic complex is used as the fluorescent material. The conventional organic rare earth fluorescent complex has simple preparation, is easy to disperse, dissolve and refine in an oily medium, and has a strong fluorescent effect under the excitation of ultraviolet light under ultraviolet light.
2. Daylight-activated color-changing security ink
In the sunlight, it can emit visible light (400 ~ 800nm) anti-counterfeiting printing ink. This ink is discolored on the surface due to the action of the sun, and is substantially discolored by ultraviolet radiation. At present, several kinds of such inks that have been developed and applied in the market in China have a color change effect under sunlight (also in ultraviolet light), and can be changed from colorless to purple, blue, yellow, etc., or from colored to Colorless change is a rookie and wonderful in anti-counterfeiting materials.
3. Thermal anti-counterfeiting ink (also known as thermochromic anti-counterfeiting ink)
An ink that can undergo a color change effect under the action of heat. According to the different temperature required for discoloration, it can be divided into hand-type color-changing anti-counterfeiting ink and high-temperature discoloration anti-counterfeiting ink. The hand temperature type color-changing anti-counterfeiting ink refers to an ink which can change color at a temperature of 34 to 36 ° C. According to the difference of the color change mode, it can be divided into single color reversible, multi-color irreversible and multi-color irreversible thermal anti-counterfeiting ink. At present, China has developed five kinds of hand-temperature type single-color reversible inks. The color-changing methods are: rose red becomes colorless, purple red becomes colorless, blue becomes colorless, green becomes colorless, orange red becomes colorless, and can also be designed as The colored color becomes various other colors; the high-temperature single-color reversible anti-counterfeiting ink has the following functions: pink to blue, yellow to red, red to black, and the like. Thermochromic substances can be classified into inorganic salts, coordination compounds, organic substances (dye molecules), and liquid crystal polymers.
4. Reaction color ink
A variety of chemical substances added to the ink, under certain conditions, can undergo various chemical reactions, so that the ink changes color to achieve anti-counterfeiting purposes. A part of the thermal anti-counterfeiting ink, the pressure-sensitive color-changing ink and the moisture-sensitive color change are all color-changing inks. In addition, the acid bismuth indicator is added to the ink, and after printing the trademark, the color change agent is encountered, and the color of the ink can be changed to achieve the purpose of anti-counterfeiting.
5. Magnetic ink
It is a special ink made by mixing magnetic iron oxide powder into ink. At present, it is mainly used for printing magnetic coded characters and symbols of bank tickets, and has the function of recording and storing information. The magnetic coded ticket is put into the magnetic code reader to identify the authenticity. Appropriate use on the packaging and decoration, can have a stronger and more secure anti-counterfeiting.
6. Biochemical reaction ink
This kind of ink is mixed with a substance that can produce a biochemical reaction. It can be used first to mark an invisible mark on the package and the anti-counterfeit print. Then, according to the formula, the chemical reagent is selected according to the formula. When the method of micro-heating, wetting, rubbing, etc. is operated, the characters or patterns will be revealed. Due to the complexity of the chemical composition of the ink, it is very difficult to make the fake. Some secret documents, important tickets, etc. are printed with this ink.
7. Liquid crystal ink
A compound having crystallinity is added to the liquid crystal ink. Under the influence of weak current and temperature, the liquid crystal displays light and dark patterns and colors due to changes in the crystal lattice. Packages printed with this ink can react with changes in temperature. If it is used to print calendars, it will show different colors as the temperature of the four seasons changes. It is a new type of ink material that is very vital and needs to be developed. It is promoted and used in the field of packaging and decoration, and its anti-counterfeiting effect is immeasurable.
8. Printing ink
The printing ink is made up of color materials, fillers, binders, etc., and the composition selection of the color materials is an important factor in determining the hue and vividness of the printed products. Ink tone matching is a very complicated problem. The difference in chroma and brightness of some organic pigments and inorganic pigments in nature and some inherent colors cannot be achieved by artificial synthesis. The same type of ink produced by different ink factories, the color of different batches is not the same. Therefore, some manufacturers of packaging and decoration products with a large amount of use have ordered their products to be printed on some large-scale and more advanced printing manufacturers, and at the same time, they have customized special inks for printing each product in the ink factory. The ink factory is responsible for confidentiality.
9. Laser holographic logo combined with fluorescent encryption security ink
Laser holographic logos have been widely used in trademarks, corporate logos and other fields. However, with the popularization and application of laser holographic recognition preparation technology, there are many manufacturers that can produce laser holographic logos. If the new anti-counterfeiting measures can be added for secondary encryption without damaging the integrity of the laser holographic mark, the anti-counterfeiting function can be improved.
China has now researched and developed a laser holographic logo secondary encryption integrated anti-counterfeiting technology, that is, on the laser holographic logo, a certain process can be added to the detectable special fluorescent material, which is invisible to the naked eye in sunlight, and the ultraviolet light in the counterfeit instrument The special fluorescent images of various colors are displayed, which have the characteristics of abrasion resistance, heat resistance, convenient detection, accuracy, and strong anti-counterfeiting, and the production cost is less increased.
10. In addition to changing ink
If you make a correction in the corresponding part, a certain password will appear. This kind of ink is mainly used to print securities such as checks, money orders and documents. If someone corrects or eliminates the original number on the denomination of the draft, the word "obsolete" will appear immediately.
Fourth, laser holographic image anti-counterfeiting technology
Also known as the rainbow hologram. It rose in the early 1980s and has formed an emerging industry abroad. The introduction of this technology into China is still a matter of recent years. Laser holographic molding technology is a kind of holographic grating technology in optics. It is the whole process of using the principle of laser holography to quickly copy the printing equipment and materials of the imaged object or image. The product is very different from the general photo. It can not only reproduce the main image of the original object, but also display the shape of different sides of the original with different line of sight orientation. Using the principle of white light diffraction grating, it presents a colorful and colorful picture. People are more vivid, vivid and realistic, and have high technicality, sophisticated equipment and complicated craftsmanship. After processing, the products are easily destroyed, so they have a high degree of appreciation, decoration, packaging (partial and overall) and anti-counterfeiting value.
In the late 1980s, a few Western developed countries such as the United States and the United Kingdom developed laser holography. Recently, this technology is still blank in China. Its products have a wide format (up to 1.1 meters, and a narrow width of only 0.15 meters), and the production speed is fast. It is the most urgent and ideal anti-counterfeiting packaging material for medium and high-end goods in China. Especially the emergence of paper holography and the organic combination of paper holography and color printing is a major revolution in the decorative and printing fields. These characteristics of laser holographic products determine its wide range of uses and market. With the development of laser technology, the application of laser holography in non-destructive testing, ultra-shrinking technology, stereo white light, arts and crafts, physical demonstration and other fields has expanded rapidly. Recently, US banknote printing companies have also tried to add holographic technology to the printing process.
Fifth, bar code anti-counterfeiting technology
Commodity barcode is a kind of code of goods, which is designed by human beings for effective management of products such as computers. If we can reasonably use commodity technology, including rational selection of barcode carriers, reasonable selection of printing methods and printing machines, reasonable selection of printing locations, etc., then it is possible to make commodity barcode technology anti-counterfeiting.
At present, it is generally believed that there are only two types of bar codes with anti-counterfeiting functions, one is invisible bar code (covering implicit bar code, photochemically processed invisible bar code, invisible bar printing invisible bar code), and the other is metal bar code.
Sixth, code anti-counterfeiting identification and telephone identification system
The code anti-counterfeiting logo and telephone identification system are to record all the records of all incoming products in the anti-counterfeiting data center library by setting a random password on each product, so that consumers can use the telephone, computer and other tools to check whether the password is correct or not. The product is authentic. This anti-counterfeiting technology is implemented on the same physical object for high anti-counterfeiting purposes. The most typical example is banknotes. For example, the renminbi uses seven kinds of anti-counterfeiting methods. Therefore, various chemical anti-counterfeiting technologies should also be combined with other anti-counterfeiting technologies to improve the anti-counterfeiting strength of brand-name products.
Finally, under the leadership of the Ministry of Public Security, the State Bureau of Technical Supervision and the Anti-Counterfeiting Association of the relevant institutions of higher learning and research institutes in China, we will create a new world of anti-counterfeiting. In short, comprehensive anti-counterfeiting technology is the only way for my national defense pseudo-business.