The principle of magnetic anti-counterfeit paper is to apply magnetic powder on the paper substrate, or add magnetic powder to the pulp in a special way when making paper, so that the paper made is magnetic. This kind of magnetic paper feels different from other ordinary papers at the place where the magnetic powder is added, in particular, it can be recognized by a magnetic metal recognizer or magnetic induction equipment, thus distinguishing it from other ordinary papers. It can be used to make anti-counterfeit trademarks, anti-counterfeit magnetic account cards and computer-recognized magnetic anti-counterfeit labels on high-end packaging.
Digital watermark paper
Digital watermarking technology is to use signal processing to embed hidden marks in digitized multimedia data. Such marks are usually invisible and can only be extracted by a dedicated detector or reader. Can be text, product owner's ID code, two-dimensional image, audiovisual audio information and random sequence. It is mainly used for copyright protection, identity authentication, copy protection and media tracking. It can also be used for confidential communication, multilingual movie systems, network access restrictions and media additional information. It is divided into visible watermarks and invisible watermarks. Visible watermarks can only be used for fixed parts of the image to identify the ownership of the work; invisible watermarks are visually invisible, mainly used to identify the ownership of the work and track the source of the work.
Copy-proof paper
Anti-copying is to prevent the original from going through the copier to copy out completely different products from the original, which can prevent forgery. The purpose of copy protection is to make the copied text, graphics, and information content completely unrecognizable. According to the anti-counterfeiting technology, the paper can be divided into anti-copy paper that uses hidden patterns to print hidden text, patterns, and patterns; anti-copy paper that uses coloring characteristics; anti-copy paper that contains photochromic materials; and anti-copy paper that contains thermochromic materials; Anti-copy paper containing photoluminescent materials; anti-copy paper containing fluorescent substances; anti-copy paper using the principle of light diffuse emission and anti-copy paper using polarized light.
Thermal security paper
The thermal sensitive anti-counterfeiting paper is mainly obtained by coating the thermal sensitive substance on the paper base, and using the thermal reversible color characteristic of the thermal sensitive substance to identify the authenticity. It has the characteristics of heating color development, cooling fading and repeated display for many times. At present, thermal sensitive anti-counterfeiting paper mainly includes liquid crystal and leuco dye.
Photochromic security paper
The so-called photochromism is that some characteristics change color after being illuminated, and return to the original color after leaving the light; photochromic anti-counterfeiting paper is anti-counterfeiting paper containing these substances. There are two main types of existing photochromic anti-counterfeiting paper: one is ultraviolet photochromic anti-counterfeiting paper, which is currently the most widely used and most mature technology, and banknotes in almost all countries use ultraviolet photochromic ink to print currency Anti-counterfeit mark; when the bank is authenticated, as long as the currency is placed under the ultraviolet lamp, you can see the anti-counterfeit mark displayed in a specific part, and it is not displayed when leaving the ultraviolet light source. The other type is natural photochromic anti-counterfeiting paper. The light source of this paper discoloration is natural light, including general indoor light, not just direct sunlight. The application of this kind of anti-counterfeiting paper is more convenient, but it still needs further improvement.
Anti-counterfeit paper with fiber yarn and color dot encryption
This kind of anti-counterfeiting paper is made by adding fiber filaments or colored dots to the pulp during the papermaking process. The earliest form of this anti-counterfeiting paper is to add colored plant fibers to the pulp. Currently, the following forms are commonly used:
1.Add colored chemical fibers or fluorescent fibers to the pulp, the former can be seen on the paper with the naked eye, the latter must be visible under the irradiation of ultraviolet light; its color is mostly red, blue, orange, and the shape can be Thick or thin, long or short.
2.In the process of papermaking, insert metal wire, plastic wire coated with metal film on the surface, metal wire with fluorescence, film coated with optical mutagenic material or magnetic material into the paper layer.This wire is in the process of copying It is difficult to reproduce, so it is widely used as an effective anti-counterfeiting method.
3.Disperse the material with optical change function (such as fluorescence, luminescence, or color change), usually plastic film or metal foil, into small pieces of a certain shape, such as a circle or polygon, dispersed in the paper layer; its characteristic is to use the naked eye It can be recognized, and the copier is difficult to reproduce.
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