Security printing is a comprehensive anti-counterfeiting technology and belongs to a branch of special printing. It refers to the use of printing to prevent imitation, copying or forgery without permission.
Security Printing Introduction
Printing anti-counterfeiting technology is a comprehensive anti-counterfeiting technology, including anti-counterfeiting design plate making, precise printing equipment, and inks, papers, etc. From the point of view of printing technology alone, printing anti-counterfeiting technologies mainly include: engraving, computer design, gravure printing, rainbow printing, pattern docking, double-sided printing, multi-color wiring printing, multicolor overprinting, microprinting Technology, refractive latent image, invisible image and image intermix printing.
Common anti-counterfeit printing technology
First, relief pattern anti-counterfeiting technology
Plateprinting technology is a special technique that uses special means to make different special textures for the background color, text, pattern, and image layout components. It can not only play anti-counterfeiting effect, but also can play a decorative role. It is an ideal technology for the layout of documents and tickets. Due to its non-repeatable design, it cannot be scanned and it cannot be copied.
Second, micro anti-counterfeiting technology
Miniature anti-counterfeit printing technology adopts the most advanced digital image reproduction technology. The principle is to print the pattern or text on the surface of the document in a miniature manner, and the image can be realistically reproduced through a magnifying glass.
Third, paper security
Paper is the material basis for printing various kinds of securities. Some special papers manufactured using special processes basically have anti-counterfeiting features. The anti-counterfeiting technologies used in special papers mainly include: anti-counterfeit paper as a new development in the field of anti-counterfeit technology, and its advantages are: The following aspects. First of all, it is the holographic pattern directly on the paper, remove the plastic information layer, so it is rarely copied. Secondly, the pattern on this security paper can be designed and made according to the requirements of the merchants. It can produce different textures and different weights of paper (70-400 grams, such as coated paper, cardboard, cardboard, etc., which the merchant needs, and it can also Like plain paper, offset printing, screen printing, etc. are both reliable and convenient. Third, the price of this security paper is only slightly more expensive than ordinary composite gold and silver cardboard, which is equivalent to a tenth of the price of holographic anti-counterfeit trademarks. First, it saves the labor cost of labeling and is easily accepted by merchants.Fourthly, products that are packaged directly with this kind of laser anti-counterfeiting paper can not only have anti-counterfeiting effect, but also be beautiful. Weathering in the earth will not cause environmental pollution, so it will increasingly replace laser holographic products containing plastic films.
Fourth, watermark paper
During the manufacturing process, watermark paper can use technical means to incorporate the required logos and patterns into the paper. These patterns are not easy to see under normal circumstances. Only when facing the glare can we see that most of the larger denominations issued in China are Watermark paper printing is used. Watermarks are still recognized by world security experts as an effective anti-counterfeiting technology in today's advanced science and technology era. They continue to be adopted and developed by all countries. Most countries have banknotes, important international documents, and drawings of facilities. All kinds of tickets are also printed on watermarked paper. For example, in the new version of 100 US dollars in 1996, the watermark of the "Franklin" person portrait was used, and watermarks such as "Tiananmen" and "Mao's" were produced in large-value RMB paper in China. In addition to being used in currency paper, watermarks have also been widely used in other ticket papers. The position of the watermark in the paper is fixed, not fixed and semi-fixed. The watermark paper production process was invented by Italian papermaking experts in the 13th century. Because it integrates the complex processes of design, engraving, web making, and papermaking in the manufacturing process, it often makes counterfeiters useless. Checking the watermark is also one of the most effective means to identify true and false. Of course, the use of watermark anti-counterfeiting on a large number of packaging devices is still uneconomical at this stage. An ink is developed using special materials, and the imitation watermark is printed on ordinary copper plate paper, which is very similar to the watermark effect.
V. Anti-counterfeiting additives
The so-called anti-counterfeiting additives, that is, adding special properties of anti-counterfeiting materials in the ink chain material, special processing of special additives. 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 coaters or other equipment to add anti-counterfeit additives to the ticket, product label and packaging paper layer. This type of anti-counterfeiting technology is characterized by simple implementation, low cost, good concealment, bright colors, easy inspection (even hand-warming color change), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks in various countries.
1, UV fluorescence anti-counterfeiting technology
Under the irradiation of ultraviolet light (200-400nm), it can emit special light with visible light (400-800nm). According to different wavelengths of the excitation light source, it can be divided into short-wave ultraviolet excitation fluorescence anti-forgery printing ink (excitation wavelength 254nm) and long-wave ultraviolet laser fluorescence anti-counterfeit printing ink (excitation wavelength of 365nm). According to whether the color of the ink is divided into two kinds of colored fluorescent ink and colorless fluorescent ink. Among the commonly used fluorescent materials, there are mainly three types according to their composition. First, the organic fluorescent material is an unsaturated molecule with a large conjugate, most of which are excited by sunlight. It is used for decoration with obvious colors, and has poor fluorescence stability and is easily oxidized and decomposed. Second, an inorganic fluorescent material synthesized at a high temperature is used. Fluorescent materials for fluorescent screens and fluorescent tubes have good resistance to radiation and high stability, but are difficult to disperse in oily media. It is difficult to synthesize and has poor water resistance. Third, chemically synthesized rare earth organic complexes are used as fluorescent materials. Conventional organic rare earth fluorescent complexes have simple preparation, are easy to disperse, dissolve, and refine in oily media, are colorless under visible light, and have strong fluorescence effects under ultraviolet light excitation.
2, daylight to stimulate color anti-counterfeiting technology
In the sunlight, it can emit visible light (400-800nm) anti-counterfeiting technology. This anti-counterfeiting technology is discolored on the surface due to the action of the sun, and is essentially discolored by ultraviolet rays. At present, several of the anti-counterfeiting technologies that our company has developed and applied are in the sunlight (also under UV light), that is, the discoloration effect can occur from colorless to violet, blue, yellow, and other colors, and can also be designed to be colored. Colorless change is a rookie and wonderful thing in security materials.
3, the anti-counterfeiting technology of thermal anti-counterfeiting technology under the effect of heating can produce anti-counterfeiting effect. According to the different temperature required for discoloration, can be divided into hand-temperature color anti-counterfeiting technology and high-temperature color anti-counterfeiting technology. The hand-type color change prevention and anti-counterfeiting technology means that the color change effect can occur at a temperature of 34-36°C. According to the difference in the way of discoloration, it can be divided into single-color reversible, multi-discoloration irreversible and multi-discoloration irreversible thermal anti-counterfeiting technology. Now China has developed five kinds of hand-warming single color reversible anti-counterfeiting technology. The color changing methods are: rose red becomes colorless, purple red becomes colorless, blue becomes colorless, green becomes colorless, orange red becomes colorless can also be designed For the color into a variety of other colors; three high-temperature single color reversible anti-counterfeiting technology, color change methods are: pink to blue, yellow red, red and black and so on. Thermochromic substances can be classified into inorganic salts, coordination compounds, organic substances (dye molecules) and liquid crystal polymers.
4, the reaction of anti-counterfeiting technology, a variety of chemical substances added to the paper, under certain conditions, can produce a variety of chemical reactions, so that the paper changes color, to achieve anti-counterfeiting purposes. Part of the thermal anti-counterfeiting technology, pressure-sensitive color anti-counterfeiting technology, humidity-sensitive color change are all belong to color anti-counterfeiting technology. In addition, the acid-base indicator is added to the paper, and after the trademark is printed, a color change agent is encountered, which can change the color of the paper and achieve the purpose of anti-counterfeiting.
5. The 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 words and symbols of bank tickets, and has the effect of recording and storing information. A magnetically encoded ticket can be inserted into a magnetic code reader to identify authenticity. Appropriately used on the packaging and decoration, it can have a stronger and more secure anti-counterfeit.
6, dripping disappear technology This type of anti-counterfeiting technology is mixed with the ingredients that can produce biochemical reactions, you can use this additive in the package and the need for anti-counterfeit printed products on a visually invisible mark, and then, according to the recipe targeted Select chemical reagents, when using micro-heat, wet, friction and other methods of operation, the text or pattern will be revealed. As the chemical composition of the additive is relatively complicated, counterfeiting is very difficult, and some of the secret documents, important tickets, etc. have adopted this anti-counterfeiting technology. It is the simplest and most easily operated nano-material anti-counterfeiting in the field of anti-counterfeiting detection. When only one drop of water is used for identification, the pattern disappears. After the water is dry, the pattern is naturally restored and reversible. It is an advanced anti-counterfeiting technology in China.
7. Liquid crystal anti-counterfeiting technology inks are compounded with crystallization properties. Under the influence of weak current and temperature, the liquid crystal displays bright and dark patterns and colors due to changes in the crystal lattice. With this kind of ink, the packaging and decorating products 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 kind of new ink material that is very vital and yet to be developed. The promotion of its use in the field of packaging and decoration, its anti-counterfeiting effect is incalculable.
8, printing spot color ink printing ink is made of pigments, fillers, connecting materials, etc., which is the choice of color material is an important factor in determining the hue and vividness of printed products. Ink toning is a very complex problem. Some organic and inorganic pigments in nature have differences in chroma, brightness, and some intrinsic colors that cannot be achieved by artificial synthesis. The ink of the same type produced by different ink factories varies in color from batch to batch. Therefore, some of the larger manufacturers of packaging and decorating products use their own products to print at some large-scale and more technologically advanced printing companies. At the same time, they have customized special inks for each product in the ink factory. The ink factory is responsible for confidentiality.
Six, laser anti-counterfeiting
"Laser anti-counterfeiting", also known as "laser anti-counterfeiting," is the use of laser holographic technology to print unique patterns or text on metal films. These patterns or words can be seen from different angles to see the various patterns of diffraction. The laser anti-counterfeiting label is attached to the product or package, the manufacturing process of the laser anti-counterfeit label is more complicated, the plate making cost is higher, and the original diffraction pattern on the laser anti-counterfeiting label is not easy to reproduce the same again, thereby effectively combating the counterfeiting behavior. .
Seven, bar code anti-counterfeiting technology
Product barcodes are codes of commodities designed by humans for effective management of computers and other commodities. If we can reasonably use commodity technologies, including reasonable selection of the carrier of the barcode, a reasonable choice of printing methods and printing machines, a reasonable choice of the location of printing, etc., then it is possible to make the commodity barcode technology have an anti-counterfeiting effect.
Eight, security code identification and telephone identification system
The security code identification and telephone identification system (800 telephone query anti-counterfeiting) is to set up a random password on each product to archive all the records of all products on the network into the anti-counterfeiting data center library, allowing consumers to use phone, computer and other tools to check the password. The right or wrong 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 the banknote. For example, the renminbi adopts seven kinds of anti-counterfeiting measures. Therefore, various chemical anti-counterfeiting technologies should also be combined with other anti-counterfeiting technologies in order to increase the anti-counterfeit strength of brand-name products.