2. Watermark paper: In the papermaking process, install the pre-designed watermark graphic printing plate on the silk screen, or press it through the printing cylinder. Due to the different heights of the pictures and texts, the corresponding density of the pulp is formed with different thicknesses. After the paper is formed, due to the difference in the density of the pulp at the image and text, the light transmittance is different, so the original design of the image and text can be displayed during the light transmission observation, which is the watermark. There are three types of watermarks: fixed watermark, semi-fixed watermark and unfixed watermark. The fixed watermark is fixed at a certain position on paper such as banknotes, passports, certificates, etc., and is accurately matched with the printed graphics or other anti-counterfeiting measures visible to the naked eye. Worker's avatar. Semi-fixed watermark The distance and position between each group of watermarks are fixed, and each group is arranged in a row on the paper, so it is also called continuous watermark and is mostly used for special paper. Unfixed watermarks are distributed on the full version of the paper (full version watermark). For example, China's 5 yuan and 1 yuan have full version ancient money watermarks. It is difficult to fix the watermark printing technology, so it is mostly used for printing securities such as banknotes and passports. Watermarks can be of two types: yin and yang, and can even be made in different layers, just like a Chinese ink painting. A new transparent watermark developed abroad can only be observed from a certain angle, and cannot be copied by scanning. 3. Electronic watermarking paper: According to the British "Times" report on May 3, 1999, a system called \ "micro-bar \" uses chaos theory to encode data into a password and add it to the background of the file. This \ "微 巴 \" is invisible to the naked eye, but its password can be read and cracked with a scanner. Only the original printing plate can print \ "微 巴 \", any sophisticated printing equipment can not copy or only print some blurry images. According to the company that developed it, it is almost impossible to decipher the coding system of "micro-bar" from a mathematical point of view. A standard computer scanner is used for identification; the commercial version can also be used to check banknotes in supermarket scanning equipment. \ "微 巴 \" can be easily hidden in the background of watermarks and images of securities such as currencies and stocks, so it is also called electronic watermark. The technology can also be used for irrelevant important parts of photos and anti-counterfeit labels of other paper products, etc., and can be checked with a scanner. 4. Ultra-thin paper: The surface layer of this kind of paper has different colors and is very thin. Once wiped away, another color of the paper base is exposed. Use it to prevent signatures or numbers from being erased or altered. 5. Anti-counterfeiting embedding: consciously add a certain substance to the carrier such as paper to prevent counterfeiting. (1) Fiber yarn and colored dot encryption paper: Add fine fiber yarn or colored dots with different colors to the pulp during papermaking. These fiber filaments or colored dots are visible to the naked eye, and some can only display color under ultraviolet irradiation. Fiber filaments can be long or short, thin or thick, and their colors are generally red, blue, orange, etc .; their distribution is random, and the degree of density is also different. In China's fifth set of 100-yuan notes, RMB (1999 edition), red or blue fibers can be seen in the blank space of currency paper. There are also fibers distributed in fixed locations, such as the US dollar printed before 1928, and red and blue fiber filaments are only distributed in a narrow and long area in the middle of the ticket. Because these fiber filaments are embedded in the pulp, they can be picked out with a needle, which is easy to distinguish from the fiber filaments pressed into the paper surface or printed on the paper under a stereo microscope. (2) Metal foil, plastic sheet, flat polyester filament encryption method: Add special metal foil, plastic sheet, flat polyester filament and other substances to the pulp to prevent forgery. The polyester silk can also be printed with text and can only be seen by the light in a certain direction, so it cannot be copied. A kind of banknotes issued in Italy hides a metal foil that is invisible to the naked eye, and makes a sound when inspected with a special identifier. (3) Two-color fluorescent fiber encryption method: Add two different colors of fibers to currency and other securities and cards, so that they can randomly generate different horizontal and vertical orientations, and different fluorescent colors and strengths. Optical characteristics. According to the inventor's estimate, with a density of 12 fibers per square inch, the probability of random duplication is 10-1000, which is almost impossible to duplicate. But this method needs to record and check the data in advance. (4) Embedded hologram: Two-dimensional or three-dimensional hologram is embedded in paper or card, and different images can be seen when changing the viewing angle. 6. Safety thread: In the process of making paper, special metal thread or polyester plastic thread of different colors, micro-printing thread or fluorescent thread is embedded in a specific position of the paper. When the light is observed, a complete or intermittent (window opening) line is buried in the paper base. The shape of the line is generally a straight line, and it can also be made into a wave shape, a sawtooth shape, and the like. The window-type security wire is intermittently exposed on the paper surface. When copying with a copier, the exposed metal wire is copied into an intermittent black line, so it cannot be copied. The safety line can be designed in various colors, and can also be in the same line on a two-color interval. There can also be microtext on the line. In 1996, a new version of the 100-dollar US dollar paper contained a polymer security line that showed pink fluorescence under ultraviolet radiation, and there was a continuously printed miniature text "" USA100 \ ". The thermal safety thread is a pink thread at room temperature. When the temperature is 37 ° C with your fingers, microtext appears on the part. The laser safety line can change not only the color but also the image. A metal or magnetic safety wire can emit a signal or sound when checked with a corresponding detector. China's fifth set of 100 yuan bonds (1999 version) of the security line, Yingguang can also see \ "RMB100 \" microtext, use the instrument to check that the line is still magnetic. 7. Paper with trace additives: Add trace chemical elements to a certain part of the pulp or paper, and use corresponding methods to detect when identifying. Using the principle of biological antigen and antibody specific reaction, adding antigen to a certain part of the paper, using the mechanism of the antigen to produce a specific reaction when the antigen meets the corresponding antibody, using the color method or fluorescent labeling method to check whether there is papermaking When adding the antigen, to distinguish between true and false. There is a kind of chemical encryption paper. Special compounds are added to the pulp or when sizing the paper surface. A special pen is used to draw or paint on the paper during detection to develop color or fluorescence. 8. Anti-copying paper: The surface of the paper is coated with a thin aluminum protective layer, which does not affect the printing, but the light reflection of the aluminum can be used to disperse or deflect the copying machine, so that the copy is dark. There is a method to deal with color copying. When copying or scanning this kind of logo, the logo can only be made in black and white with the word "VOID \", making the imitation fail. The anti-counterfeit mark made in this way can be used for packaging of computer software and cosmetics.
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1. Banknote printing paper: The raw material used for banknote printing paper is mainly long-fiber cotton and hemp. The paper is tough, smooth, stubble, folding-resistant and lint-free. Some countries also add special markers to the pulp Or randomly distributed red and green fiber filaments. Banknote printing paper is non-fluorescent, making it easy to observe anti-counterfeiting marks printed with fluorescent ink under fluorescent lamps. Plastic banknotes made of plastic instead of paper have come out and are more durable. Banknote printing paper can of course also be used for important certificates such as government bonds, stocks and other securities or passports.