Comprehensive information on anti-counterfeiting printing technology

Printing anti-counterfeiting technology is a comprehensive anti-counterfeiting technology, including anti-counterfeiting design and plate making, precision printing equipment and supporting inks, papers, etc. From a purely printing technology perspective, printing anti-counterfeiting technologies mainly include: engraving plate making, computer-designed pattern, gravure printing, rainbow printing, pattern docking, double-sided printing technology, multi-color wiring printing, multi-color overprinting, and microprinting. technology, refractive latent images, invisible images and image interference printing. With the development of high technology and people's requirements for high-quality packaging prints, the packaging and printing industry has begun a large-scale technological revolution in recent years. The combined use of a variety of printing equipment, The mutual penetration of various printing processes makes printing products more unpredictable and colorful. Products printed using these new technologies create layers of obstacles and resistance for those trying to counterfeit them. Basic introduction Chinese name: Introduction to anti-counterfeiting printing technology: Comprehensive anti-counterfeiting technology includes: anti-counterfeiting design plate making, precision printing equipment and other technologies: engraving plate making, computer design pattern and other common processes: flat-convex combined printing and multi-process combined printing, etc. Auxiliary equipment: common processes, technologies and methods, materials and auxiliary materials for anti-counterfeiting additives. Commonly used processes include plano-convex combined printing and multi-process combined printing. Generally, high-end packaging and decoration prints are mostly designed with large-area color blocks, multi-color sequences and continuous toning. Complex lines, patterns, etc. bring certain difficulties to a single printing method. If plano-convex combined printing is used, that is, the advantages of the letterpress printing machine, which has high pressure and even inking, are used to produce a large area of ??solid color blocks, and the advantages of the offset printing machine, which are gentle and soft in pressure, are used to print four-color continuous blending and complex line parts. This way, the advantages and disadvantages are maximized, and the effect is It's very obvious. For some printing products with higher requirements and more complexity, multi-process printing such as hand, convex, concave and flat, convex and concave and leakage can also be used. In short, the more complex the printing process and the more difficult it is to print the packaging and decoration prints, the better the anti-counterfeiting effect will be. Multi-color cross-printing Multi-color cross-printing is also called cross-color printing. Generally, letterpress printing is used for printing. According to the printing requirements, after placing partitions in the ink tank, multiple hues are placed in different partitions. of ink. Under the action of the ink-crossing roller, the ink in adjacent parts is mixed and then transferred to the printing plate. Using this printing process, multiple colors can be printed at once with soft transitions in between. Since it is difficult to see the placement distance of the ink tank partitions from the printed matter, it can also play a certain anti-counterfeiting role. If this process is used for large-area shading printing, its anti-counterfeiting effect will be more prominent. Gravure printing technology means that the graphics and text on the printing plate are convex, and the ink of the printed graphics and text is also convex, and the graphics and text have clear lines and distinct layers, which can be felt by hand. This printing technology not only protects the paper, but also has anti-counterfeiting properties. Important securities use gravure printing technology. The types of gravure printing are divided into two categories according to the plate making method: engraving intaglio (including hand-engraved intaglio and mechanical engraving intaglio) and etched intaglio. Hand-engraved gravure printing has better anti-counterfeiting effect. Combined with anti-counterfeiting ink technology. Some printing anti-counterfeiting inks have larger pigment particles and require thicker ink layers, while gravure printing has a stronger texture. The combination of the two will achieve dual anti-counterfeiting and decorative effects. For example, gravure printing uses fluorescent ink, which not only ensures the slightly convex feel of gravure printing, but also ensures the use requirements of fluorescent ink. The secret anti-counterfeiting functions of both are also guaranteed. Laser holographic iris printing Laser holographic iris printing uses laser holographic photography to create a template in a shockproof room, and then transfers the pattern to a certain carrier through a certain amount of pressure. Its products can produce a colorful rainbow-like unique effect when illuminated by a 45-degree point light source, and the image has a strong three-dimensional effect. It is favored by consumers and is called the ink-free color printing of the 21st century by some knowledgeable people. technique. At present, two processes are mostly used: cold press coating and direct hot stamping into a soup printing film. Since the plate making process of this technology is relatively complex and difficult, only a few domestic manufacturers can produce it, so the anti-counterfeiting effect is excellent. It should be particularly pointed out that holography uses a laser light source in a shockproof room to capture the amplitude information and phase information of the light wave of the scene at the same time in a very short time, and uses the interference principle of light to form every particle of the scene to form all the information. . During the plate making process, slight air movement in the room can cause changes in the color of the holographic image. Therefore, it is impossible to make two identical holographic plates anyway. Hand-engraved printing Most packaging and decoration prints require the key product names and patterns to be raised. These reliefs of graphics and text are mostly made of relief plates using chemical etching methods, and are then combined with gypsum gravure plates for imprinting. Although this method has the advantages of simple production process and short cycle time, the embossing effect is not good and it does not have the anti-counterfeiting effect. Therefore, many printing factories currently use the engraving printing process. Hand-engraved plates need to use copper plates with better texture. The engraver relies on the manual skills of the engraver to carve out the graphics and text (mainly patterns) required by the user in layers with a carving knife. Generally, 3 to 4 levels can be carved out. In particular, it should be pointed out that the chemical etching method can only create one level, and the dead corners on the edges cannot be made to a certain degree like manual engraving to improve the embossing effect and prevent the paper from cracking.

Since the skills of a carver cannot be mastered in a short period of time, and different carvers have different carving styles, even the same carver cannot carve two identical templates. Therefore, it is impossible to use such a template to stamp out Packaging prints not only have good embossing effects, rich layers and high embossing rate, but also have strong anti-counterfeiting effects. Special gloss printing Special gloss printing is a new printing technology that has become more popular in the packaging and printing industry in recent years. Special gloss printing processes currently include metallic gloss printing, pearlescent printing, pearl gloss printing, refractive printing, variable gloss printing, laser holographic iris printing, crystal gloss printing, imitation metal etching printing and matte printing. Among them, metallic gloss printing uses aluminum foil metal composite paper and is coated with relatively transparent ink to create a special metallic gloss effect on the printed matter. Pearlescent printing is to first apply silver paste on the surface of the printed matter, and then apply extremely transparent ink. The silver glitter refracts through the ink layer to create a pearlescent effect. Pearl gloss printing uses ink mixed with mica particles to produce a glossy effect similar to pearls and shellfish. Refractive printing uses a refractive plate to imprint a pattern on the printed matter using a certain pressure to produce a unique effect of light refraction. Matt printing uses matte ink printing or ordinary ink printing and then covers it with a matte film, which can produce a hazy weak gloss feature, so it also has a safer anti-counterfeiting effect. Representative examples of digital code-changing information printing include 1. Bar code. Product bar code is a code for goods, which is designed by humans for effective management of computers and other goods. If we can rationally use product technology, including rationally selecting the carrier of the barcode, rationally selecting the printing method and printing machine, rationally selecting the printing position, etc., then it is possible to make the product barcode technology anti-counterfeiting. 2. The code anti-counterfeiting mark and telephone identification system The code anti-counterfeiting mark and telephone identification system (800 hotline for anti-counterfeiting inquiries) is to set a random password on each product and archive all records of all products connected to the network in the anti-counterfeiting data center library, allowing Consumers use telephones, computers and other tools to check whether the password is correct 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 the RMB, which uses seven anti-counterfeiting methods. Therefore, various chemical anti-counterfeiting technologies should be combined with other anti-counterfeiting technologies to improve the anti-counterfeiting strength of famous brand products. Technology and Methods Relief Pattern Anti-Counterfeiting Technology Pattern technology is a special technology that uses special means to create different special textures on the background, text, patterns, images and other layout components. It can not only prevent counterfeiting, but also play a decorative role. It is an ideal technology for the layout design of documents and tickets. Because its design cannot be repeated, it cannot be scanned into the original image and cannot be counterfeited. Miniature anti-counterfeiting design technology Miniature anti-counterfeiting printing technology adopts today's most cutting-edge digital image reproduction technology. Its principle is to print patterns or text on the surface of the document in a miniature way, and the image can be reproduced realistically through a magnifying glass; Dual card invisible anti-counterfeiting design technology Card invisible anti-counterfeiting technology uses the principle of pixel imaging to print the originally set information so that people cannot see the original pattern clearly. When the two cards are put together, the pixel information on the two cards is If you add one, it will become an image. Because it cannot understand various factors such as the angular distance in the original design, it cannot be scanned into the original image, and it cannot be used to counterfeit materials and auxiliary papers. Anti-counterfeiting paper is the material basis for printing various securities. Some use Special paper made with special processes basically has anti-counterfeiting characteristics. The main anti-counterfeiting technologies used in special paper are: 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, removing the plastic information layer, so there is little possibility of being copied. Secondly, the patterns on this kind of anti-counterfeiting paper can be designed and plate-made according to the requirements of the merchants, and paper of different textures and weights required by the merchants (70g to 400g, such as coated paper, cardboard, cardboard, etc.) can be produced. Like ordinary paper, it can be used for offset printing, screen printing, etc., which is reliable and convenient. Thirdly, the price of this kind of anti-counterfeiting paper is only slightly more expensive than ordinary composite gold and silver cardboard, and is only equivalent to one-tenth of the price of holographic anti-counterfeiting trademarks. First, it saves the labor cost of labeling and is easy to be accepted by merchants. Fourth, products directly packaged with this laser anti-counterfeiting paper can not only play an anti-counterfeiting role, but also be very beautiful. It can be weathered in the soil and will not cause environmental pollution. Therefore, it will gradually replace laser holographic products containing plastic films. Currently, some manufacturers of cigarettes, wine, cosmetics, and food have begun to initially try to use laser holographic anti-counterfeiting paper. , and achieved good economic benefits. It is expected that this new type of anti-counterfeiting packaging material will have a broad market. During the manufacturing process of watermark paper, technical means can be used to make the required logos, patterns, etc. into the paper. The pattern is not easy to see under normal circumstances and can only be seen clearly under strong light. Most of the larger denominations of RMB issued in our country are printed on watermark paper. In today's era of advanced science and technology, watermarks are still recognized by anti-counterfeiting experts around the world. This effective anti-counterfeiting technology continues to be adopted and developed by various countries. Banknotes, important international archives, facility drawings and various tickets in most countries are also printed on watermark paper. For example, the new version of 100 US dollar paper was printed in 1996. The "Fu Lan Kelin" portrait watermark was used, and watermarks such as "Tiananmen" and "***" were produced on my country's large-denomination RMB paper.

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 watermarks on the paper. The production process of watermark paper was invented by Italian papermaking experts in the 13th century. Because its manufacturing process incorporates complex processes such as design, carving, net making, and papermaking, counterfeiters are often helpless. Checking the watermark is also one of the most effective ways to identify authenticity. Of course, it is not economical to use extensive watermarks for anti-counterfeiting on packaging and decoration at this stage. We developed an ink using special materials to print imitation watermarks on ordinary coated paper, which has a very similar effect to watermarks. Anti-counterfeiting additives The so-called anti-counterfeiting additives are special additives that are made by adding anti-counterfeiting materials with special properties into the ink binder and processed by special processes. The anti-counterfeiting additives currently developed and applied in our country can be divided into 10 categories, which are explained separately. The specific implementation mainly uses special coating machines or other equipment to add anti-counterfeiting additives to the layers of tickets, product trademarks and packaging paper. This type of anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright colors, convenient inspection (even the color can be changed by hand temperature), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries. 1. Ultraviolet fluorescent anti-counterfeiting technology: Special ink that can emit visible light (400~800nm) under ultraviolet light (200~400nm). 2. Sunlight-induced discoloration anti-counterfeiting technology: Anti-counterfeiting technology that can emit visible light (400~800nm) under sunlight. This anti-counterfeiting technology appears to change color due to the action of the sun, but in fact it also changes color due to ultraviolet radiation. 3. Thermal anti-counterfeiting technology: Anti-counterfeiting technology that can change color under the action of heating. According to the different temperatures required for discoloration, it can be divided into hand-warm discoloration anti-counterfeiting technology and high-temperature discoloration anti-counterfeiting technology. 4. Reactive discoloration anti-counterfeiting technology: Various chemical substances added to paper can undergo various chemical reactions under certain conditions, thereby causing the paper to change color and achieve anti-counterfeiting purposes. As part of heat-sensitive anti-counterfeiting technology, pressure-sensitive color-changing anti-counterfeiting technology and moisture-sensitive color-changing anti-counterfeiting technology are all color-changing anti-counterfeiting technologies. In addition, acid-base indicators are added to the paper. After the trademark is printed, the color of the paper will change when it encounters the discoloration agent to achieve anti-counterfeiting purposes. 5. Magnetic anti-counterfeiting technology is a special anti-counterfeiting technology made by mixing magnetic iron oxide powder into paper. It is currently mainly used to print magnetically encoded text and symbols on bank notes, and has the function of recording and storing information. 6. Anti-counterfeiting technology such as dripping disappearing technology is mixed with substances that can produce biochemical reactions. You can first use this additive to make an invisible mark on packaging and prints that need to be anti-counterfeiting. Then, according to the formula, it can be targeted Select chemical reagents, and when operated with slight heat, wetting, friction, etc., the text or pattern will be revealed. 7. Liquid crystal anti-counterfeiting technology: Compounds with crystallization properties are added to the ink. Under the influence of weak current and temperature, liquid crystal displays light and dark patterns and colors due to changes in the crystal lattice. Packaging decorations printed with this ink can react with changes in temperature. 8. Printing spot color ink: Printing ink is a mixture of color materials, fillers, connecting materials, etc. The selection of color materials is an important factor in determining the hue and brightness of the printed product. Ink color matching is a very complex problem. The differences in chroma, brightness and some inherent colors of some organic and inorganic pigments in nature cannot be achieved artificially.