Talk about anti-counterfeiting printing
Printing anti-counterfeiting technology is a comprehensive anti-counterfeiting technology, including anti-counterfeiting design and plate making, precision printing equipment, and matching ink and paper. From the perspective of printing technology alone, printing anti-counterfeiting technologies mainly include: engraving and plate making, computer design of plate patterns, gravure printing, rainbow printing, pattern docking, double-sided printing technology, multi-color wiring printing, multi-color overlay printing, micro-printing Technology, latent image, invisible image and image interference printing.
The following introduces several common anti-counterfeiting printing technologies:
1. Embossed pattern anti-counterfeiting technology
The pattern technique is a special technique that uses special means to make different special textures for the background color, text, patterns, images and other layout elements. It can not only play the role of anti-counterfeiting, but also play a decorative role, it is an ideal technology for the layout design of certificates and tickets. Because of its inability to repeat the design, it cannot be scanned into the original image, and it cannot be counterfeited.
Second, the miniature anti-counterfeiting technology The miniature anti-counterfeiting printing technology adopts the most cutting-edge digital image copy technology today. Its principle is to print the pattern or text on the surface of the document in a miniaturized manner, and the image can be reproduced realistically through a magnifying glass;
3. Paper anti-counterfeiting paper is the material basis for printing various securities. Some special papers manufactured by special processes basically have anti-counterfeiting features. The anti-counterfeiting technology used in special papers mainly includes: anti-counterfeiting paper as a new development in the field of anti-counterfeiting technology. Its superiority has the following aspects. First of all, it is to make the holographic pattern directly on the paper, removing the plastic information layer, so there is little possibility of being copied. Secondly, the pattern on this anti-counterfeit paper can be designed and plated according to the requirements of the merchant, producing different textures and different weights of paper (70 grams to 400 grams, such as coated paper, cardboard, cardboard, etc.), and it can also Like ordinary paper, offset printing, silk screen printing, etc. are reliable and convenient. Third, the price of this kind of anti-counterfeiting paper is only slightly higher than that of ordinary composite gold and silver cardboard, which is only equivalent to tenth of the price of holographic anti-counterfeiting trademarks. One, and save the labor cost of labeling, which is easy to be accepted by the merchants. Fourth, the products directly packed with this laser anti-counterfeiting paper can not only play the role of anti-counterfeiting, but also very beautiful. Fifth, because the holographic paper can be discarded Weathering in the soil will not cause environmental pollution, so it will gradually replace laser holographic products containing plastic films. At present, some manufacturers of tobacco, wine, cosmetics, and food have begun to initially try to use laser holographic anti-counterfeit paper, and have made Good economic benefits. It is expected that this new type of anti-counterfeiting packaging material will have a broad market.
4. Watermarking paper In the manufacturing process of watermarking paper, you can use technical means to make the required logos, patterns, etc. into the paper. These patterns are not easy to see under normal circumstances, and can only be seen against the strong light. Most denominations of RMB are printed on watermark paper. In today's era of advanced science and technology, watermarking is still recognized by anti-counterfeiting experts from all over the world as an effective anti-counterfeiting technology, which continues to be adopted and developed by various countries. Most countries have banknotes, important international documents, facility drawings and Various tickets are also printed with watermark paper. For example, in 1996, the new version of the $ 100 paper used the "Fulklin" watermark, and China's large-denomination RMB paper produced "Tiananmen", "Mao Zedong" and other watermarks. In addition to being used in currency paper, watermarks have also been widely used in other ticket papers. There are fixed, unfixed and semi-fixed positions of the watermark on the paper. The production process of watermarked paper was invented by Italian paper experts in the 13th century. Because it integrates complex processes such as design, sculpture, net making, and papermaking in the manufacturing process, it often makes counterfeiters counterfeit. Checking the watermark is also one of the most effective means of identifying true and false. Of course, it is not economical to use watermark anti-counterfeiting on packaging decoration at this stage. An ink is developed with special materials to print imitation watermark marks on ordinary coated paper, which is very similar to the watermark effect.
5. Anti-counterfeiting additives The so-called anti-counterfeiting additives are special additives made by adding anti-counterfeiting materials with special properties to the ink binder and processed by a special process. The anti-counterfeiting additives currently developed and applied in China can be divided into 10 categories, which are described separately. The specific implementation mainly uses special coating machines or other equipment to add anti-counterfeiting additives to the ticket, product trademark and packaging paper layer. This type of anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright colors, convenient inspection (even hand temperature can change the color), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries.
1. Ultraviolet fluorescent anti-counterfeiting technology 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 ink color, it can be divided into two types: colored fluorescent ink and colorless fluorescent ink. There are three main types of commonly used fluorescent materials according to their composition. First, organic fluorescent materials are unsaturated molecules with large conjugates, mostly excited by sunlight, used for decoration with obvious colors, poor fluorescence stability, and easy to oxidize and decompose; second, inorganic fluorescent materials synthesized by high temperature are used The luminescent material used in fluorescent screens and fluorescent tubes has good radiation resistance and high stability, but it is difficult to disperse in oily media. It is difficult to synthesize and poor in water resistance; thirdly, the chemically synthesized rare earth organic complexes are used as fluorescent materials. Conventional organic rare earth fluorescent complexes are simple to prepare, easy to disperse, dissolve, and refine in oily media. They are colorless under visible light and show strong fluorescent effects under ultraviolet light excitation.
2. Anti-counterfeiting technology of sunlight-induced color change Under the sunlight, anti-counterfeiting technology that can emit visible light (400 ～ 800nm). This anti-counterfeiting technology appears to be discolored by the action of the sun on the surface, but it is also discolored by ultraviolet radiation. At present, our company has developed and applied several such anti-counterfeiting technologies under sunlight (also can be under ultraviolet light), that is, the color change effect can occur, from colorless to purple, blue, yellow and other colors, can also be designed from colored to The colorless change is a rookie in the anti-counterfeiting materials.
3. Thermal anti-counterfeiting technology Anti-counterfeiting technology that can change color under the action of heating. According to the different temperature required for color change, it can be divided into hand temperature type color change anti-counterfeiting technology and high temperature color change anti-counterfeiting technology. The hand warming type color-changing anti-counterfeiting technology means that the color-changing effect can occur at a temperature of 34-36 ° C. According to the difference of color changing method, it can be divided into single color changing reversible, multi color changing irreversible and multi color changing irreversible thermosensitive anti-counterfeiting technology. At present, China has developed five types of hand-temperature type single color reversible anti-counterfeiting technology, the color changing methods are: rose red colorless, purple red colorless, blue colorless, green colorless, orange red colorless can also be designed It becomes various other colors for coloring; three high-temperature single-color reversible anti-counterfeiting technologies, the color changing methods are: pink to blue, yellow to red, red to black, etc. Thermochromic substances can be divided into inorganic salts, coordination compounds, organic substances (dye molecules) and liquid crystal polymers.
4. Reaction discoloration and anti-counterfeiting technology Various chemical substances added to paper can produce various chemical reactions under certain conditions, thereby changing the color of the paper and achieving the purpose of anti-counterfeiting. Part of the thermal anti-counterfeiting technology, pressure-sensitive color-changing anti-counterfeiting technology and humidity-sensitive color-changing are all color-changing anti-counterfeiting technologies. In addition, the acid-base indicator is added to the paper, and after printing the trademark, the color-changing agent can change the color of the paper to achieve the purpose of anti-counterfeiting.
5. Magnetic anti-counterfeiting technology is a special anti-counterfeiting technology made by mixing magnetic iron oxide powder into paper. At this stage, it is mainly used to print magnetically encoded text and symbols of bank tickets, which has the effect of recording and storing information. Put the magnetic coded ticket into the magnetic code reader to identify the authenticity. Appropriate use of it in packaging and decoration can have a stronger and more secure anti-counterfeiting.
6. Anti-counterfeiting technologies such as dripping disappearing technology are mixed with substances that can produce biochemical reactions. You can use this additive to make an invisible mark on the packaging products and printed products that require anti-counterfeiting. Choosing chemical reagents, when using micro-heating, wetting, rubbing and other methods of operation, words or patterns will be revealed. Because the chemical composition of the additive is relatively complex, it is very difficult to counterfeit. Some top secret documents and important tickets have adopted this anti-counterfeiting technology. It is currently the simplest and easiest to operate nano-scale material anti-counterfeiting in anti-counterfeiting detection in China. Only one drop of water is needed to apply the logo on the identification, and the pattern disappears. After the water is dried, the pattern naturally recovers and is reversible. It is an advanced anti-counterfeiting technology in China.
7. Liquid crystal anti-counterfeiting technology inks have added compounds with crystalline properties. 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. Packaging and decoration products printed with this ink can respond to changes in temperature. If it is used for printing calendars, it will show different colors with the change of temperature in four seasons. It is a new ink material with vitality and yet to be developed. Promoting its use in the field of packaging and decoration, its anti-counterfeiting effect is also inestimable.
8. Printing special-color inks Printing inks are made of a mixture of colorants, fillers, and connecting materials. The selection of colorants is an important factor in determining the hue and vividness of the printed matter. Ink color matching is a very complicated problem. The chroma, brightness difference and some inherent colors of some organic and inorganic pigments in nature can not be achieved by artificial synthesis. The color of the same type of ink produced by different ink factories varies from batch to batch. Therefore, some manufacturers of packaging and decorating products with a large amount of use have their products designated for printing by some larger and more advanced printing manufacturers. At the same time, special inks for each product are customized in the ink factory. The ink factory is responsible for confidentiality.
Sixth, laser anti-counterfeiting "laser anti-counterfeiting", also known as "laser anti-counterfeiting", is the use of laser holography technology to print unique patterns or text on the metal film, these patterns or text can be seen from different angles in the past can see various patterns of diffraction. Adding laser anti-counterfeiting labels on products or packaging, the manufacturing process of laser anti-counterfeiting labels is more complicated, the cost of plate making is higher, and the original diffraction patterns on laser anti-counterfeiting labels are not easy to reproduce the same again, thus effectively combating counterfeiting .
7. Barcode anti-counterfeiting technology The product barcode is a kind of product code, which is designed by human for the effective management of computers and other products. If we can reasonably use commodity technology, including a reasonable choice of barcode carrier, a reasonable choice of printing method and printing machine, a reasonable choice of printing location, etc., then it is possible to make commodity barcode technology have anti-counterfeiting effect.
8. Code anti-counterfeiting identification and telephone identification system Code anti-counterfeiting identification and telephone identification system (800 phone inquiry anti-counterfeiting) is to set up a random password on each product to archive all records of network-connected products in the anti-counterfeiting data center database for consumption The user uses telephone, computer and other tools to check the correctness of the password to identify the authenticity of the product. This anti-counterfeiting technology is implemented on the same physical object to achieve a high degree of anti-counterfeiting. The most typical example is banknotes, such as RMB, which uses seven anti-counterfeiting methods. Therefore, various chemical anti-counterfeiting technologies should also be combined with other anti-counterfeiting technologies in order to improve the anti-counterfeiting of brand-name products.
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