These anti-counterfeit papers are said to represent the future of the paper industry.
In the field of anti-counterfeiting printing , paper anti-counterfeiting is the top. At present, the commonly used anti-counterfeit printing papers are mainly as follows, and they all have special anti-counterfeiting characteristics. Watermark paper It is paper with embossed, touchable images, barcodes, etc. The banknote uses the watermark anti-counterfeiting technology. Since the watermark cannot be reproduced by a photocopier, a scanner, etc., its anti-counterfeiting effect is highly valued. Nowadays, the application scope of watermarking has been extended to notes of value, documents and even books. The watermark is used in the papermaking process to use the technology to feed the desired logo, pattern, etc. into the paper, such as installing a pre-designed watermark graphic printing plate on the screen or pressing it through a printing cylinder. Because the height of the graphic is different, the pulp is formed into different thicknesses of different thicknesses. After the paper is formed, the transmittance of the pulp varies according to the density of the pulp at the image. Therefore, when the light is observed, the original design can be displayed. The watermark has three kinds of fixed watermark, semi-fixed watermark and unfixed watermark. The printing process of fixed watermarking is difficult, and must be fixed at a certain position of the main body of banknotes, licenses, documents, etc., and usually matched with the printed graphics or other anti-counterfeiting measures visible to the naked eye, such as 100 yuan in the position of the watermark window. There is a fixed watermark of Mao Zedong's head. The distance and position between each set of watermarks of the semi-fixed watermark are fixed, and each group is continuously arranged on the paper, so it is also called continuous watermark, which is mostly used for special paper. The fixed watermark is distributed on the full version of the paper or the ticket surface, so it is also called the full version of the watermark. For example, the third and fourth sets of five yuan, two yuan and one yuan in China are all printed on the full-page ancient money floating watermark paper. However, the new version of the five yuan has been printed with watermarked paper with a watermark pattern. Anti-counterfeit watermark paper has evolved from the original long net paper to today's highly secure long net paper. Features include: 1) up to fifteen gray levels, so there are more levels; the thickness of the black floating watermark area can reach 40μ, thicker than the average thickness of 15~20μ paper, so there is better contrast; and there is better Details and watermark clarity. 2) Additional security measures not available for long net paper, such as security lines. 3) Add long cotton fibers to the wood pulp to improve the life of the paper. On the rotary paper machine, the watermark is formed on the surface of the watermark by the fiber pile, and the watermark is formed at the same time as the paper. This means that the watermark can be filled into the circular mesh mold to form a very clear watermark. With the development of electronic technology, there is now the introduction of electronic watermark paper. According to the British "Times" reported on May 3, 1999, a system called "micro-ba" uses chaos theory to encode data into the background of the file. This "micro-bar" is invisible to the naked eye, but can be read by a scanner and cracked its password. Only the original plate can be printed, and any precision printing device cannot copy or print only some ambiguous images. According to the development company, it is almost impossible to decipher the "micro-ba" coding system from a mathematical point of view. Security thread with security thread Refers to a gold or plastic thread placed in the middle of the paper during the papermaking process. The earliest used metal wire is the polyester metal wire, micro-letter safety wire, fluorescent safety wire, etc. The shape of the safety line has a straight line, a wave shape, a zigzag shape, and the like. According to the relevant information, the new version of the US dollar bill not only embeds the metal wire in the paper, but also shrinks the text that can only be seen with a high magnification magnifying glass. In recent years, a heat-sensitive safety line has been introduced, which is pink at room temperature and opaque. When the temperature is locally increased by fingers, as long as it reaches 37 degrees Celsius, the printed text will appear partially. There is also a safety line - the laser holographic safety line changes color depending on the viewing angle. Put a safety thread in the paper, the width of the wire can be as small as 1mm. If multiple safety wires are placed at the same time, the spacing of the wires can be as small as 4mm. The safety line can print the patterns and texts required by the user. According to the different difficulty requirements of the anti-counterfeiting, the printed patterns and characters can be made hollow or non-hollow. The safety line in banknote printing is also the focus of research in various countries: for example, the UK adopts a window-opening transmission safety line, France develops a safety line for part of the aluminizing process, France develops a safety line for part of the aluminizing process, and Finland uses a fluorescent safety line. . Biochemical anti-counterfeiting mark is a major breakthrough in the development of anti-counterfeiting technology. Recently, foreign biological research machinery has been successfully developed, mainly printing on the sticker identification to achieve anti-counterfeiting purposes. Digital deformation anti-counterfeiting technology has also been applied in foreign countries. This technology is applicable to any printed matter that requires Arabic numerals. The deformation is realized by computer. There is no rule to follow, and the identification is also through the computer.
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