Application of anti-counterfeiting technology on book printing
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First, paper security
Paper is the material basis for printing various securities. Some special papers made by special techniques basically have anti-counterfeiting characteristics. We analyze the anti-counterfeiting technologies used in special papers:
1. Watermark paper
In the manufacturing process of watermarked paper, technical means can be used to put the required logos and patterns into the paper. These patterns are not easy to see under normal circumstances. They can only be seen clearly against strong light, and are recognized by anti-counterfeiting experts all over the world. An effective anti-counterfeiting technology, most countries' banknotes, important international documents, facility drawings and various tickets are also printed on watermarked paper. 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. In the manufacturing process, it integrates complex processes such as design, sculpture, netting, and papermaking, so it often makes the fakes do nothing. Checking the watermark is also one of the most effective means of identifying true and false.
2. Security line
Safety line means placing a gold or plastic wire in the middle of the paper during the papermaking process. The safety line was first used in special gold wire. Now it is using plastic wire and has been developed into various kinds, such as miniature letter security wire, fluorescent safety wire and so on. The shape of the safety line has a straight line, a wave shape, a zigzag shape, and the like.
3. Red and blue fiber silk or colored dots
Red or blue fibers or colored tablets (dots) are incorporated into the pulp during the papermaking process, or sprinkled on the surface of the paper before the paper is unset, with fluorescent reflection under ultraviolet light. Red and blue fiber filaments and color dots have two fixed and unfixed positions in the paper.
4. Anti-copy paper
After copying this type of paper, the words "copy" and "invalid" will appear, which will effectively prevent color copying of important documents. Another type of full-absorbent anti-copy paper has a blue or reddish-brown appearance. The text on the paper can only be seen through the light, and the copy is dark.
5. No fluorescent paper
Generally, paper is fluorescent under ultraviolet light. Therefore, the printing paper and some valuable securities or bills are anti-counterfeiting using special paper without fluorescence. For example, the banknotes of various countries, passports, and some paper bases of the tickets are not fluorescent, which makes it easier to reveal additional fluorescent images.
Second, album printing technology
For example, multi-color serial printing, multi-color serial printing is also called cross-color printing or rainbow printing. Generally, it is printed by letterpress printing machine. According to the requirements of printing products, after placing the partition in the ink tank, it is separately in different partitions. Put in a variety of hue inks. Under the action of the series of rollers, the adjacent portions of the ink are mixed and then transferred to the printing plate. With this printing process, multiple colors can be printed at one time, and the intermediate transition is soft. Since it is difficult to see the placement distance of the ink tank partition from the printed product, it can also play a certain anti-counterfeiting effect. If this process is applied to large-area shading printing, its anti-counterfeiting effect will be more prominent.
Third, anti-counterfeiting ink
1. Ultraviolet fluorescent ink can emit visible light special ink under ultraviolet light.
2. Daylight-activated color-changing anti-counterfeiting ink can emit visible light anti-counterfeiting printing ink under the sunlight. The color change effect can be changed from colorless to purple, blue, yellow, etc., and can also be designed to change from colored to colorless.
3. Thermal anti-counterfeiting ink (also known as thermochromic anti-counterfeiting ink) can produce color-changing ink under heating. According to the temperature required for discoloration, it can be divided into hand-type color-changing anti-counterfeiting ink and high-temperature discoloration anti-counterfeiting ink. According to the difference of the color change mode, it can be divided into single color reversible, multi-color irreversible and multi-color irreversible thermal anti-counterfeiting ink.
4. Reaction color changing ink
A variety of chemical substances added to the ink, under certain conditions, can undergo various chemical reactions, so that the ink changes color to achieve anti-counterfeiting purposes. A part of the thermal anti-counterfeiting ink, the pressure-sensitive color-changing ink and the moisture-sensitive color change are all color-changing inks.
5. Magnetic ink
It is a special ink made by mixing magnetic iron oxide powder into ink. At present, it is mainly used for printing magnetic coded characters and symbols of bank tickets, and has the function of recording and storing information. The magnetic coded ticket is put into the magnetic code reader to identify the authenticity.
6. In addition to changing the ink
If you make a correction in the corresponding part, a certain password will appear. This kind of ink is mainly used to print securities such as checks, money orders and documents. If someone corrects or eliminates the original number on the denomination of the draft, the word "obsolete" will appear immediately.
Fourth, bar code anti-counterfeiting technology
Commodity barcode is a kind of code of goods, which is designed by human beings for effective management of products such as computers. If we can reasonably use commodity technology, including rational selection of barcode carriers, reasonable selection of printing methods and printing machines, reasonable selection of printing locations, etc., then it is possible to make commodity barcode technology anti-counterfeiting. Due to the larger amount of information, the two-dimensional bar code has strong anti-counterfeiting properties through the processing of computers and inkjet printers. There is also the application of the checkmark, which can also be used for anti-counterfeiting by a formula operation, followed by a specific number after a consecutive number.
Five, code anti-counterfeiting identification and telephone identification system
The code anti-counterfeiting logo and telephone identification system are to record all the records of all incoming products in the anti-counterfeiting data center library by setting a random password on each product, so that consumers can use the telephone, computer and other tools to check whether the password is correct or not. The product is authentic. This anti-counterfeiting technology is implemented on the same physical object for high anti-counterfeiting purposes.
Sixth, the design of the pattern security
The pattern design, also known as the flower ball design, the guilloche design, the shading background design. This is one of the oldest and longest-lasting anti-counterfeiting technologies. This background image can be found on banknotes, passports, and cheques that are familiar to everyone. The current security graphic design system is combined with computer technology, which can be designed according to the user's own style, and designs a complete pattern background and related texts with distinct personalized features, such as flower balls, miniatures, microfilms, and anti-scanning images. Text, copy-proof graphics, embossed patterns, etc. These pictures are designed with lines and spot color printing, which can effectively prevent the separation of color separation and color copying by traditional means such as photocopying and photography, and play an obvious anti-counterfeiting effect. This is precisely what criminals driven by profiteering do not like, so this security graphic design is still widely used in the production of banknotes, checks, important national documents, securities, etc.