Talking about the Application of Seal Anti-counterfeiting Technology
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Seal printing in China is a sign of power and wealth and plays a very important role. In recent years, criminals and gangs at home and abroad have resorted to fraudulent use of power to seek huge profits, fraudulently generate huge sums of money, use poor management of the seal industry, lag behind seal carving techniques, and lack effective anti-counterfeiting measures. Customs, taxation, public security and other law enforcement agencies, banks, insurance and other financial institutions, as well as enterprises and institutions and other legal entities and seals, have disrupted social order and have caused serious economic losses to the state, collectives, and individuals. In order to prevent and crack down on criminal activities of counterfeit seals and meet the urgent needs of the society, many companies, research institutes, and colleges and universities have carried out research and development of seal anti-counterfeiting technologies and their products, and have made important progress.
(1) Caption text encryption
At present, the design of official seals has evolved from handwriting and drawing to microcomputer typesetting. The various stamp typesetting systems being used generally use standard printing fonts. Recently developed two types of seal special fonts, one of which is to modify the stroke characteristics of standard fonts to form a special font, and according to a certain period, modify the font features; the other is the seal handwritten fonts, after the establishment of the seal standards Fonts. The fonts of these two fonts have different degrees of difference from the standard fonts, which can play a certain anti-counterfeiting effect. Without changing the existing seal and graphic specification, in order to make the seal artwork sophisticated and to increase the difficulty of forgery, a variety of text encryption methods have been developed, such as changing the font position and tilt angle, aspect ratio, The pen lanes are narrow and wide, forming hollow words; the pentagonal star consists of curves or characteristic patterns, changing or strictly stipulating their position and shape; adding random points and edges of various shapes; setting invisible anti-counterfeit signs or code to cooperate with colorless ink, covering The printed text is invisible under natural light. Only under UV light can the fluorescent logo or code be seen. At the same time, some of the above changes were quantified, feature distances were measured, and computer programs were used to associate them with units and corporate codes, seal numbers, and other passwords to form multi-level encryption. The graphic standard of China's official seal was formulated in the 1950s. It is relatively simple and has long been unsuitable for the needs of social development and anti-counterfeit. Some units have proposed new drafts of official regulations for graphics and graphics, and developed more complicated graphics and higher information volume. Seal. However, the work in this area still requires extensive consultation, in-depth discussion, comparison of various plans, complementing each other's strengths, and drawing up new seal graphic standards and standards as soon as possible.
(B) improve the level of seal engraving
The use of automatic engraving machines and advanced plate making techniques instead of manual engraving of official seals is the only way for the modernization of the seal industry. It is also one of the main ways to improve the precision of engraving and enhance its anti-counterfeiting capabilities. The computer-controlled laser engraving machine has been developed and manufactured with high precision and high processing speed. It can engrave non-metallic materials such as plexiglass, horns, and rubber, but it cannot engrave metal materials. To solve this problem requires the use of high-power laser tubes, a significant increase in equipment costs, and difficulties in promotion. By improving the photographic chemical etching process, finer copper seals can be prepared. By using a liquid photosensitive resin and photopolymerization, a high-precision plastic seal can be directly prepared. The computer-controlled CNC engraving machine being developed has a relatively high precision and can engrave hard materials such as copper and steel, but it cannot be carved into a material with a soft texture. The above engraving equipment and plate making process have complementary advantages. The accuracy of seal engraving is improved to 0.1 to 0.01 mm, which can prevent manual engraving of forged seals.
(3) Anti-counterfeiting ink and ink pad
The use of encrypted ink and ink pad is an important aspect of stamp anti-counterfeiting. The anti-counterfeiting ink pad has been developed and produced. The appearance color is red and blue, the fluorescence is stable, the chapter is not glued, and there is chemical encryption. The detection is convenient. Anti-counterfeiting and reverse printing inks developed and produced have red, blue, and colorless appearance, and the fluorescence is red, orange, yellow, or a variable characteristic wavelength, and some of them have a second encryption. The stability of its fluorescence, although it has done aging tests in different ways and conditions, and formulated the corresponding quality standards, but there is no stereotyped product, in the simulation of the typical climate conditions across the country, and in different climate areas of use, Anti-counterfeiting performance and product quality follow-up test, draw out the anti-counterfeit performance of ink stamps, and change with the use of time. Nor did we obtain data on the correlation between aging tests and normal use. Therefore, the stability of fluorescent inks remains to be further studied. A new type of multi-encrypted ink pad, penetrating and reversing ink is being developed and preliminary results have been achieved.
(D) Application of New Chapters
The seal body of the ordinary seal is separated from the ink and ink pad, and it is inconvenient to use. Atomic seal (this name is not exact, should be based on the production of different materials and processes, respectively, referred to as the oil seal and oil seal), combined with the ink stamp body, easy to use, the need for special equipment to produce, has a certain anti-counterfeiting effect, but There are different degrees of deformation problems. In recent years, the flip chapter developed and produced has been combined with an ink pad to make it easy to use. The surface can be made of metal and non-metal materials. The ink pad is more adaptable to ink, and it is used for encryption and management of ink, ink and seals. Created favorable conditions. At present, there are still some quality problems that need to be further improved.
(5) Seal information storage and management system
Seal anti-counterfeiting three-point technology, seven-point management, and unmanaged anti-counterfeiting technology will cause new and more serious confusion. The establishment of a strict management system for the production and sale of seal engraving machines and other stamping equipment, anti-counterfeit printing inkpad and key raw materials, the production process and use of seals, the identification of seals, and the approval and supervision of various links, etc. The mandatory storage of information and computer network management are the key measures to strengthen the management of the seal industry and maintain and improve the anti-counterfeiting capabilities of seals. Several stamp information storage and management systems have been developed and put into trial operation. There is an urgent need to develop new seal management methods and national computer networking management plans and standards.
(6) Automatic Seal Identification System
In addition to manual detection using the corresponding detection equipment and methods, the use of computer-based automatic identification of the cryptographic seal can increase the efficiency and speed of identification of printed documents and meet the special requirements of certain departments. A variety of seal automatic identification systems have been developed and developed to automatically identify the input seals within a few seconds. However, the seals must be clear and heavy in color. If the seal is light in color, the locality is not clear, or other random text exists in the seal, the identification results are not good, and even wrong results can be obtained.
The above-mentioned seal anti-counterfeiting technology can prevent manual-to-manufacture forgery of seals, but it can not effectively prevent the use of scanners or video cameras to input seals into computers, printouts after correction, photoengraving, or laser photocopying and other advanced technologies to forge seals. Most of the current forged seals are hand-carved, but with the advancement and popularization of science and technology, the anti-counterfeiting capabilities of seals have been enhanced, and the means and methods for criminals to forge seals and seals will be rapidly increased. It has been found that photo stamps are used to forge seals. Gangs. Therefore, the research and development of seal anti-counterfeiting technology must not only aim at the current situation, but also focus on the future. High-tech anti-counterfeit technologies should be continuously introduced.
In foreign countries, the accredited sign is mainly signed, and printed text is supplemented. The study of seal technology focuses on improving quality and ease of use. Compared with banknotes, credit cards, and certificates, there is a big gap between the study of seal anti-counterfeiting technologies. In China, due to various reasons such as history, traditional customs and social systems, the sign of recognition is mainly printed and the signature is supplemented. Seal anti-counterfeiting is of special significance to China. Therefore, the research and development of seal anti-counterfeiting technology can only take its own way on the basis of learning from related foreign technologies.
Laser engraving applied to seal anti-counterfeiting