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 point of view of printing technology, printing anti-counterfeiting technology mainly includes: engraving plate making, designing plate pattern with computer, gravure printing, rainbow printing, pattern docking, double-sided printing technology, multi-color wiring printing, multi-color overlapping printing, micro-printing technology, refractive latent image, invisible image and image mixed printing. With the development of high technology and people's requirements for high-quality packaging printed matter, packaging printing industry has started a wide-ranging technological revolution in recent years, and a variety of printing equipment has been used. The products printed by these new technologies set up layers of obstacles and resistance for those who try to be counterfeiters. Introduction to Chinese Name: Introduction to Anti-counterfeiting Printing Technology: Comprehensive anti-counterfeiting technologies include: anti-counterfeiting design and plate making, precision printing equipment and other technologies: engraving and plate making, computer-designed plate patterns and other common technologies: auxiliary equipment such as plano-convex printing and multi-process printing: common technologies, technologies and methods, materials and AIDS of anti-counterfeiting additives, Common process plano-convex combination printing and multi-process combination printing. Generally, high-grade packaging and decoration printed materials are designed with large-area color blocks, multi-color sequential continuous tone pictures and complex lines and patterns, which brings certain difficulties to a single printing method. If plano-convex combination printing is adopted, that is, using the large-area solid color block with the advantages of high pressure and uniform inking of relief printing machine, and using the advantages of flat and soft pressure of lithographic printing machine to print four-color continuous harmonic complex line parts, the effect is very obvious. For some more demanding and complicated prints, you can also use multi-process printing such as hand, convex, concave and flat, convex and concave leakage. In short, the more complicated the printing process and the more difficult it is to print, the better the anti-counterfeiting effect will be. Multi-color printing Multi-color printing is also called cross-color printing. Generally, it is printed by relief printing machine. It is based on the requirements of printing, after placing a partition in the ink tank, ink with various hues is put in different partitions. Under the string action of the string roller, the inks of adjacent parts are mixed and then transmitted to the printing plate. With this printing process, multiple colors can be printed at one time, and the middle transition is soft. Because it is difficult to see the placement distance of the ink tank partition from the printed matter, it can also play a certain anti-counterfeiting role. If this technology is used in large-area shading printing, its anti-counterfeiting effect will be more prominent. Gravure printing technology means that the graphic parts on the printing plate are raised, and the ink of the printed graphic is also raised, while the graphic lines are clear and distinct, which can be felt by hand. This printing technology not only protects the paper, but also has anti-counterfeiting performance. Gravure printing is used for important securities. The types of intaglio printing can be divided into two categories according to the plate-making methods: engraved intaglio (including hand-carved intaglio and mechanical engraved intaglio) and etched intaglio. The anti-counterfeiting effect of hand-carved intaglio printing is better. Combined with anti-counterfeiting ink technology. Some printed anti-counterfeiting inks have larger pigment particles and need thicker ink layers, while intaglio printing has stronger texture. The combination of the two will achieve double anti-counterfeiting and decoration effects. For example, the use of fluorescent ink in gravure printing not only ensures the slight convex feeling of gravure printing, but also ensures the use requirements of fluorescent ink, and the secret anti-counterfeiting functions of both are also guaranteed. Laser holographic iris printing Laser holographic iris printing uses laser holographic photography to make a template in an earthquake-proof room, and then transfers the pattern to a certain carrier through certain pressure. Under the irradiation of 45-degree point light source, its products can produce colorful rainbow-like unique effects, and the image has a strong three-dimensional sense, which is favored by consumers and is called ink-free color printing in the 21 ST century by some people of insight. At present, cold-pressing coating and direct blanching of soup printing film are widely used. Because the plate-making process of this technology is complicated and difficult, only a few domestic manufacturers can produce it, so the anti-counterfeiting effect is excellent. It should be pointed out in particular that holography uses a laser light source to simultaneously capture the amplitude information and phase information of the scene light wave in a very short time in an earthquake-proof room, and uses the principle of light interference to form every particle of the scene and form all the information. In the process of plate making, the subtle indoor air flow can lead to the color change of holographic images, so it is impossible to make two identical holographic plates anyway. Hand-carved plate printing most packaging and decoration printed matter requires that the key names and patterns be raised. Most of these graphic protrusions are made into relief plates by chemical etching, and then they are combined with gypsum intaglio for stamping. Although this method has the advantages of simple manufacturing process and short period, the embossing effect is not good and it does not have anti-counterfeiting effect. So at present, there are many printing houses that use engraving printing technology. Hand-carved plates need to be made of copper plates with good texture, and the pictures and texts (mainly patterns) required by users are carved in layers with a carving knife by the hand skill of the sculptor, which can generally carve 3 ~ 4 layers. In particular, it should be pointed out that the chemical etching method can only make one level, and the dead angle of the edge part can not be made to a certain degree like manual carving to improve the embossing effect and prevent the paper from cracking. Because the skills of sculptors can't be mastered in a short time, and different sculptors have different carving styles, even the same sculptor can't carve two identical templates. Therefore, the packaging printed products imprinted with such templates not only have good embossing effect, rich layers, high imprinting rate, but also have strong anti-counterfeiting effect. Special gloss printing Special gloss printing is a popular new printing technology in packaging and printing industry in recent years. At present, special gloss printing processes mainly include metallic luster printing, pearlescent printing, pearl luster printing, refractive printing, variable gloss printing, laser holographic iris printing, crystal luster printing, imitation metal etching printing and matte printing. Among them, metallic luster printing uses aluminum foil metal composite paper and transparent ink to form a special metallic luster effect on the printed matter. Pearlescent printing is that silver paste is first used on the surface of the printed product, and then extremely transparent ink is used. The silver flash body refracts a pearlescent effect through the ink layer. Pearl gloss printing is printing with ink mixed with mica particles, which makes the printed matter have a luster effect similar to that of pearls and shellfish. Refractive printing is a unique effect of light refraction by using a refractive plate to imprint patterns on printed matter through a certain pressure. Matte printing is the use of matte ink printing or ordinary ink printing and then covered with extinction film, which can produce hazy and weak luster characteristics, so it also has a safer anti-counterfeiting effect. The representative examples of digital code-changing information printing are 1. Barcode, which is a kind of code of commodities and designed by human beings for effective management of computers and other commodities. If we can use commodity technology reasonably, including selecting the carrier of bar code, printing method and printing machine, printing position and so on, it is possible to make commodity bar code technology have anti-counterfeiting function. 2. Code anti-counterfeiting identification and telephone identification system Code anti-counterfeiting identification and telephone identification system (8 telephone inquiry anti-counterfeiting) is to set a random password on each product, and archive all the records of all products connected to the network in the anti-counterfeiting data center library, so that consumers can identify the authenticity of products by using tools such as telephone and computer to check whether the password is correct or not. This anti-counterfeiting technology is implemented on the same object to achieve a high degree of anti-counterfeiting. The most typical example is banknotes, such as RMB, which adopts seven anti-counterfeiting means. Therefore, various chemical anti-counterfeiting technologies should also be combined with other anti-counterfeiting technologies in order to improve the anti-counterfeiting efforts of famous brand products. Techniques and methods Embossed pattern anti-counterfeiting technology Embossed pattern technology is a special technology that uses special means to make different special textures for layout components such as background color, characters, patterns and images. It can not only play an anti-counterfeiting role, but also play a decorative role, and is an ideal technology for the layout design of certificates and tickets. Because it can't be designed repeatedly, it can't be scanned into the original picture and can't be counterfeited. Miniature anti-counterfeiting design technology Miniature anti-counterfeiting printing technology adopts the most advanced digital image reproduction technology. Its principle is to print patterns or characters on the surface of documents in a miniature way, and the images can be reproduced realistically through a magnifying glass. Dual-card stealth anti-counterfeiting design technology Dual-card stealth anti-counterfeiting technology adopts the principle of pixel imaging, and the original information can be printed separately, so that people can't see the original pattern clearly. When the dual cards are combined, the pixel information on the dual cards is supplemented by one, and the image is formed. Because it can't understand various factors such as the angular distance of the original design, it can't be scanned into the original image. Anti-counterfeiting paper that can't counterfeit materials and auxiliary paper is the material basis for printing all kinds of securities. Some special paper made by special technology basically has anti-counterfeiting characteristics. The anti-counterfeiting technologies used in special paper mainly include: as a new development in the field of anti-counterfeiting technology, anti-counterfeiting paper has the following advantages. First of all, it makes the holographic pattern directly on the paper, and removes the plastic information layer, so it is rarely possible to be copied. Secondly, the pattern on this kind of anti-counterfeiting paper can be designed and made according to the requirements of merchants, and the paper with different textures and weights (7g ~ 4g, such as coated paper, cardboard and cardboard) can be produced, and it can also be offset printed and screen printed like ordinary paper, which is reliable and convenient. Thirdly, 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 one tenth of the price of holographic anti-counterfeiting trademark, and it saves the labor cost of labeling and is easily accepted by merchants. Fourthly, the products directly packaged with this laser anti-counterfeiting paper can not only play an anti-counterfeiting role, but also be very beautiful. Fifth, holographic paper will gradually replace laser holographic products containing plastic films because it can be weathered in the soil and will not cause environmental pollution. At present, some manufacturers producing cigarettes, wine, cosmetics and food have begun to try to use laser holographic anti-counterfeiting paper, which has achieved good economic benefits. It is expected that this new type of anti-counterfeiting packaging material will have a broad market. Watermark paper Watermark paper can be made into paper by technical means in the manufacturing process. These patterns are not easy to see under normal circumstances, and can only be seen in strong light. Most of the larger denominations of RMB issued in China are printed by watermark paper. Watermark is still recognized as an effective anti-counterfeiting technology by anti-counterfeiting experts all over the world in the era of advanced science and technology, and continues to be adopted and developed by various countries. Banknotes, important international archives, facility drawings and various tickets in most countries are also printed with watermark paper. For example, in 1996, the new version of $1 paper adopted the head watermark of "Franklin", and the watermarks of "Tiananmen Square" and "* * *" were made in large denomination RMB paper in China. Watermark has been widely used in other paper besides currency paper. There are fixed, unfixed and semi-fixed positions of watermark in paper. The production technology of watermark paper was invented by Italian paper experts in the 13th century. Because it integrates complex technological processes such as design, engraving, netting and papermaking in the manufacturing process, counterfeiters are often at a loss. Checking the watermark is also one of the most effective means to identify the true and false. Of course, it is not economical to use a lot of watermark in packaging and decoration at this stage. An ink is developed with special materials, and the watermark-like mark is printed on ordinary coated paper, which is very similar to the watermark effect. Anti-counterfeiting additive The so-called anti-counterfeiting additive is a special additive made by adding anti-counterfeiting materials with special properties to ink binders and processing them through special processes. At present, the anti-counterfeiting additives developed and applied in China can be divided into 1 categories, which are expounded respectively. The specific implementation mainly uses special coating machines or other equipment to add anti-counterfeiting additives to tickets, product trademarks and packaging paper layers. This kind of anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright color, convenient inspection (even hand temperature can change color) and strong reproducibility, and it is the first choice for anti-counterfeiting technology of banknotes, tickets and trademarks in various countries. 1. Ultraviolet fluorescence anti-counterfeiting technology is a special ink that can emit visible light (4-8 nm) under the irradiation of ultraviolet light (2-4 nm). 2. Anti-counterfeiting technology of sunlight excitation discoloration, which can emit visible light (4 ~ 8 nm) in sunlight. On the surface, this kind of anti-counterfeiting technology is discolored by the action of the sun, but it is also discolored by ultraviolet radiation in essence. 3, heat-sensitive anti-counterfeiting technology under the action of heating, anti-counterfeiting technology that can change color. According to the different temperature required for color change, it can be divided into hand temperature color change anti-counterfeiting technology and high temperature color change anti-counterfeiting technology. 4. Reactive color-changing anti-counterfeiting technology Various chemicals added to paper can have various chemical reactions under certain conditions, thus changing the color of paper and achieving anti-counterfeiting purposes. As a part of heat-sensitive anti-counterfeiting technology, pressure-sensitive anti-counterfeiting technology and humidity-sensitive anti-counterfeiting technology belong to color-changing anti-counterfeiting technology. In addition, the acid-base indicator is added to the paper, and when it is printed as a trademark, it can change the color of the paper when it meets the color changing agent, thus achieving 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 present, it is mainly used to print magnetically encoded characters and symbols of bank tickets, with the function of recording and storing information. 6. Drip disappearance technology This kind of anti-counterfeiting technology is mixed with substances that can produce biochemical reactions. You can first use this additive to put an invisible mark on the packaging and printed products that need anti-counterfeiting, and then select chemical reagents according to the formula. When using methods such as slight heat, wetting and rubbing, words or patterns will be exposed. 7. Liquid crystal anti-counterfeiting technology A compound with crystallization performance is added to the ink. Under the influence of weak current and temperature, liquid crystal shows bright and dark patterns and colors due to lattice changes. The packaging and decoration printed with this ink can react with the change of temperature. 8. Printing spot color ink Printing ink is a mixture of pigments, fillers, connecting materials, etc. Among them, the composition selection of pigments is an important factor in determining the hue and vividness of printed products. Ink color blending is a very complicated problem. The difference in chroma and brightness between some organic pigments and inorganic pigments in nature and some inherent colors cannot be realized by artificial synthesis.