As we all know, security paper, especially implantable window-opening security paper, has been developed for nearly 30 years. Although the online visual recognition technology has developed, the development space is limited. As a raw material for banknotes, the technology of banknote paper is constantly evolving and innovating, especially the technological development abroad is more novel and creative. It is worthy of our reference and learning, and we will explore new ways and create originality.
All along, our choice of anti-counterfeiting technology is based on three aspects: high visibility, easy identification and difficult to copy. On the basis of this, foreign counterparts have developed many great anti-counterfeiting technologies: Guardian, Optiks, Varifeye, Motion, etc., which will be briefly introduced below.
1. Australian Guardian plastic banknotes and G-Switch technology
Plastic banknotes were first co-developed by the Commonwealth Reserve Bank of Australia (RBA) and the Commonwealth Science and Research Institute of Australia (CSIRO), and became the currency issued by Australia for the first time in 1988. The key technology is the plastic substrate-biaxially oriented polypropylene film and its coating, registered as Guardian. Guardian technology film is a fiber-free moisture-proof plastic. Compared with paper banknotes, it is more difficult to tear, durable, not easy to leave creases, not easy to dissolve in the soil, convenient for machine processing and renewable, and the service life is 4 ~ 5 times.
All the anti-counterfeiting features on paper banknotes can be applied to plastic banknotes. Whether it is gravure, letterpress, lithography or implanted security thread technology, its biggest advantage is that it can be implanted with the latest and most advanced optical anti-counterfeiting features, such as transparent windows , Diffraction grating and hologram. The transparent window is a key anti-counterfeiting feature of plastic banknotes, and anyone can instantly identify the authenticity of plastic banknotes based on this feature. The banknote-based anti-counterfeiting technology based on plastics still has a lot of room for development. At present, OVD, G-Switch and other technologies are developed. The subsequent development of film, paper, and banknote technology in the United Kingdom, Germany, and the United States are all inspired and guarded by Guardian. point.
G-Switch technology is the latest color conversion anti-counterfeiting feature of Guardian plastic banknotes and one of the best anti-counterfeiting technologies in 2005. It is a dynamic optical feature, tilting the banknote under a special light source will change the original color. The bright, instantaneous color conversion effect is formed in the substrate coating. When the banknote is viewed from different angles, it will change between the two contrasting colors, producing an optical refraction effect. The color change can be easily identified without any special equipment or skills, making it easier for people to identify the authenticity of banknotes. The colors and designs on different banknotes can have different color combinations. The advantage of G-Switch is that electronic printing forgery cannot be achieved, and the anti-counterfeiting feature is made in the substrate structure, which is cost-effective and suitable for low-denomination banknotes.
2. British Optiks technical paper
Optiks by De La Rue Portals is a high-tech, high-value product that combines traditional papermaking with new materials and technologies. It is an 18mm wide pattern washed aluminum into a strip foil film, which can place the set pattern, and has a transparent window, the pattern can be seen through the transparent strip film. Its main features are: unique perspective hole; obvious 18mm wide custom-made dealuminized shading customized image; metalized image is clearly visible during the circulation process; the fluorescent band on the graphic is clearly visible under ultraviolet light.
Optiks technology is one of the typical technologies of the perfect combination of traditional watermark paper technology and new optical technology.
3. German Varifeye technical security paper
Similar to Optiks technology, in 2005, the German-owned German G & D (G & D) subsidiary Louis Centhal Security Paper Mill launched the latest film-paper combination technology "Varifeye", that is, paper material technology with transparent film windows. In 2005 Bulgaria provided the first banknote with Varifeye window function-20 Lev commemorative banknotes. On a white background, you can see the 20-digit denomination, and on a black background, you can see many interphase twills. diagonal.
The Varifeye technology was first revealed at the Banknote 2005 conference in Washington, DC in February 2005. Its security features are similar to those of Optiks. It is easy to identify with the naked eye and is very suitable as a consumer identification (first-level anti-counterfeiting) technology.
There are obvious Deckle Edges on the opening edges of Varifeye paper. For paper production, regular hole areas are formed on the surface of the copper wire mesh, which can be forged by die-cutting after the paper is formed, but in this way, the cut is relatively neat and the fibers are certain at the cut Will be cut off and destroyed. In the papermaking process, the holes are realized. Due to the natural physical effect, the fibers are not damaged and natural burrs are formed. Therefore, both Varifeye and Optiks can see obvious fiber filaments and become a safety feature of their technology. The aluminum holographic pattern hot stamped on the transparent window can be changed according to customer requirements, so it has a unique anti-counterfeiting effect.
4. Swedish Motion Security Paper
Motion security thread, also known as motion security thread, is a micro-optical material used on banknotes. The image can be changed according to the change of viewing angle. This constantly changing dynamic image can be easily recognized according to the appearance of the image and a tilting method that people gradually explored. This remarkable effect quickly attracted people's attention and curiosity, making it the most ideal anti-counterfeiting method.
The dynamic effect is made up of a series of micro-optical lenses and a series of preset images. Its micro-lens structure has three major advantages: the use of unique and protected processes; the use of unique and controlled materials; and the unique and confidential independent intellectual property rights. This dynamic safety wire technology is not formed by electric light sources, and can be observed even in relatively dim light.
The dynamic safety line uses advanced and unique technology when making lenses and micro images. The line width of the printed image is 1.5μm (and the line width of traditional printing is 20μm), and this special printing method can only be realized by Crane Currency. In order to get this kind of visual effect, the tolerance of the image and lens in printing is far from the traditional printing.
As an implantable anti-counterfeiting technology, this dynamic security thread technology can be independently applied to banknotes. As part of the banknote, it will perform its security and anti-counterfeiting function throughout the life of the banknote until the banknote disappears.
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