On the anti-counterfeiting technology of bill and

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The invention of printing technology is a symbol of human civilization. Printing is a reproduction technology that accurately, rapidly, massively and economically copies graphic information to various substrates for wide dissemination. 7. On average, the tensile machine is protected twice a month and preserved for a long time. It embodies a kind of ideological, serious, timely and artistic characteristics. It is inseparable from people's daily life. The dissemination of education and culture and the exchange of new scientific and technological knowledge all take print as the main media. People today can't live without print. In recent years, due to the development of science and technology, the application of new technologies such as computer plate making, digital printing and laser has greatly changed the traditional printing methods and expanded the printing field. The printing of tickets is one of the special ways. The printing of tickets (coupons) can be said to be one of the most closely related prints to people's daily life. From commonly used banknotes, bonds, industrial and commercial tax invoices, stocks, cheques, securities, stamps to cars, ships, air tickets, etc., they are all related to tickets (coupons), that is, to personal rights and interests. For example, if you hold any kind of forged tickets (coupons), it will damage your own rights and interests, and more seriously, it will involve relevant legal issues. Therefore, ticket (coupon) printing is not only a highly professional printing technology, but also a safe printing business. It has specific requirements and processes, but also involves various professional related knowledge and technology, especially in the use of various special technologies and techniques, which is different from general printing. However, this kind of printing is often considered to only refer to the printing of banknotes. In fact, it is not. 2. The impact of environmental factors on low-speed impact performance. Checks, shopping invoices, stamps, stocks, etc. that we come into contact with in daily life are ticket printing. Today, with the rapid economic development, the holding and use of tickets are larger. Therefore, users and producers who hold and use tickets (coupons) should not only have the ability to distinguish the authenticity, but also keep improving the technology of ticket (coupon) printing and have a deep understanding of the printing process. For example, only by knowing the paper, ink and printing method of printing tickets (coupons), can we judge their authenticity. 1、 Definition of valuable ticket (coupon): the so-called ticket (coupon) refers to the formation of valuable and denominational printed matter on the selected anti-counterfeiting paper (such as watermark paper) by printing special words, patterns and lines in a safe way. Such printed matter can pass the market, represent the tradable value, legal ownership and officially recognized qualification. 2、 Application fields of anti-counterfeiting printed tickets (coupons): banknotes, cheques, withdrawals, deposits, interest bills, passbooks, etc. 2. Tickets (coupons) issued by the government: bonds, invoices, tax tickets, welfare lottery tickets, certificates, etc. 3. Tickets (coupons) issued by the post office: stamps, money orders, stamp tickets, postcards, etc. 4. Other tickets (vouchers): shopping tickets, enterprise securities, stocks, cars, boats, air tickets, ticket vouchers, etc. 3、 The biggest drawback of valuable tickets (vouchers) is that they will be forged and altered by some criminals, especially in the era of advanced science and technology. With the emergence of various new copiers, laser printers, electronic scanning color separators, computer plotters, etc., forgeries have reached the point of confusing the fake with the real. For example, on April 6, 1999, during the large-scale invoice cleaning and inspection carried out nationwide, it was found that the invoice problem was quite serious. Criminals used invoices to falsely report, falsely claim taxes, evade and defraud taxes, and engage in corruption and bribery to commit illegal and criminal activities, wantonly misappropriate and defraud state property, and seriously disrupt the economic order. It is worth mentioning that even the anti-counterfeiting technology itself has been counterfeited, causing greater confusion to the law enforcement departments. Therefore, how to prevent forgery or imitation is a major issue in printing and using tickets (vouchers). This topic is to apply scientific methods to the protection, anti-counterfeiting, recognition and use of valuable tickets (vouchers), so as to distinguish their authenticity. 4、 Printing and using valuable tickets (coupons) should follow the principle 1. Printing and customization must be entrusted to a professional enterprise with safety management. 2. When designing ticket (coupon) patterns, complex patterns (color gradient, miniature text, relief effect, manual text encryption, etc.) and changes from the original regular graphics to random graphics should be selected to prevent imitation. 3. ① special specification customized security anti-counterfeiting paper (watermark paper, the pattern can be customized as required) or dry carbon paper should be selected. ② Raw materials should fully reflect their physical properties (bronzing, concave convex surface treatment), chemical properties (colorless ink, fluorescent ink, photochromic, penetrating, temperature change, magnetic ink, etc.). 4. In terms of coding, magnetic code and special numbering machine (font can be selected). 5. Time limit (longevity): any anti-counterfeiting has a time limit, which must not remain unchanged to avoid being copied. 6. Easy identification: Although strict anti-counterfeiting measures have been taken in the production of any valuable ticket (certificate), it is more necessary to make it easy for users to identify. 7. Establish a strict concept of protection: all processes should be as careful as handling banknotes, so as to nip in the bud. 5、 Identification of the authenticity of valuable tickets when we hold a valuable print, such as checks, certificates, banknotes, invoices, etc., once it is identified as a fake, the rights and interests of the holder will be immediately damaged. Therefore, we should have a certain knowledge of the authenticity of tickets (coupons) in order to take measures in time to safeguard their rights and interests. (1) Identification of paper paper is mainly composed of plant fibers and accessories, plus special treatment. Its main physical properties are: durability, tear resistance, folding resistance, smooth surface, easy to write, and a sense of value. Therefore, it can be identified from the following aspects: 1. Whether the anti-counterfeiting paper has a watermark or the depth of the watermark. The authenticity can be identified by irradiating the light or comparing two identical tickets (coupons). 2. Color and position of dark lines. Generally, there is no need to put a dark line into the paper, but only the special valuable ticket (coupon) paper. The dark line has many different colors, and it is used in the production of single color or multi-color mixture. If the position and color are consistent, it is the genuine product. Of course, sometimes there is a slight difference, which is not a fake product, but only an error in the production. 3. Special 1 is committed to relying on the large passenger aircraft project to improve the research level of domestic civil aircraft new materials and the structure of fiber. According to the different characteristics of different tickets (tickets), different fibers are used in the production and their distribution are also different, sometimes colored visible fibers, and sometimes invisible fibers. Both of them can have fluorescent reflection under the irradiation of ultraviolet lamp, and have different color recognition and special structure, which are the key points of identification. 4. Thickness and uniformity of paper. The thickness and uniformity of paper can be seen by light or light to see whether its distribution is uniform, or by hand. (2) Ink identification ink identification is a more professional method, which is not easy for ordinary people to identify. Ink is made by mixing and grinding pigments and some additives, so it can be distinguished from the following methods: 1. Color and luster: carefully observe whether the color of the printed matter is correct, bright and shiny. 2. Texture: relief and intaglio prints often have strong texture and bright colors. You can touch their surfaces directly with your hand, which makes them convex and concave. Lithography shows that the image lines are average and light. Friction and wear testing machine is a kind of wear-resistant testing machine. 3. Water resistance: according to different printing products, water-resistant inks can be selected. For example, in order to prevent water, alcohol and other liquids from tampering with the face, water-soluble inks are used, making it difficult to achieve the purpose. 4. Light resistance: poor quality inks often fade after exposure to strong ultraviolet and sunlight for a certain period of time. 5. Wear resistance: according to different printing products, some often use ink with strong wear resistance to prevent alteration. 6. Special ink: ① fluorescent ink: this kind of ink shows fluorescence under the irradiation of UV lamp. It is also divided into colored and colorless fluorescent inks. ② Photochromic ink: this kind of ink is colorless, easy to distinguish the authenticity, and difficult to copy. It only needs two seconds under the purple light or sunlight to identify. (3) Identification of printing methods different printing methods show different characteristics, which also bring favorable conditions to identification. The following briefly introduces the characteristics of several common printing methods: 1. Lithography: it is a common indirect printing method, which is characterized by average image lines, consistent image lines around, light image ink, thin ink layer, low color and brightness. 2. Relief printing: it is a commonly used direct printing method, which is characterized by thick ink layer and strong gloss. When the print is observed with a magnifying glass, the lines and drawings are sunken around, the burrs are prominent, and the strokes are not neat. 3. Gravure printing: it is a special printing method, which is characterized by thick ink layer and strong gloss

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