Physical anti-counterfeiting technology

1, laser holographic anti-counterfeiting technology. At present, laser rainbow stamping hologram anti-counterfeiting technology is commonly used. It is a kind of visual graphic or information produced by using laser rainbow hologram plate making technology and embossing replication technology.
The first hologram logo was used for whisky, and later this logo became popular around the world and was used on various tickets and credit cards. Introduced in the 1980s, China has been widely used in various brand-name commodities and is the most widely used of various anti-counterfeiting technologies.
The rainbow hologram is a rainbow hologram made of an ordinary holographic image as a subject that was photographed after a series of procedures. For example, a photosensitive film made of photo-etching agent is used instead of a hologram photographed in an ordinary photo. After exposure processing, an embossed phase hologram is obtained, ie, a master of rainbow hologram is produced. The master surface is full of rugged interference fringes with a fineness of more than a thousand pieces per millimeter. These embossed strips record the intensity and phase information of the object being photographed, and the holographic record is solid. Then, a thin metal film is plated on the surface of the master by vacuum plating or electroless plating, and a suitable thickness of nickel or other metal is plated to form a molded metal plate with good mechanical properties. The board is mounted on an embossing machine, a polyester plastic film is hot pressed, an embossed hologram is impressed on the film, and finally an aluminum film is vacuum-evaporated on the film to increase the reflectivity of the film. After the aluminum film is coated or coated with a protective layer, a hologram is formed. This is an opaque laser molded hologram. This hologram can be observed with white light. Each wavelength of light in the white light is diffracted by interference fringes on the picture. Because there are different diffraction angles, different colors are reproduced when viewed at different angles.
Since the combination of color blocks in a hologram is randomly encoded, rainbow holographic images have been widely used to produce anti-counterfeit labels even though it is difficult for the same device industry to produce exactly the same holographic master. Holograms can also be directly transferred to paper products and are now widely used in tickets, trademarks and credit cards.
Laser embossed holographic anti-counterfeiting labels have a single rainbow, a variety of rainbow colors, true colors, and black and white (achromatic) colors. The images are two-dimensional, three-dimensional, multiplex, and dynamic imaging.
According to different laser holographic anti-counterfeiting identification hologram imaging technology, it can be divided into classical, pulsed three-dimensional laser molded holographic anti-counterfeiting labels and composite molding, multiple image laser molding, dynamic molding, dynamic grating molding, invisible holographic molding, anti-counterfeit ink encryption laser Molded and other holographic anti-counterfeiting labels.
In recent years, bronzing holograms and transmissive holograms have also come out. They are all based on ordinary rainbow holograms. The semi-permeable hologram is made of aluminum dots on a polyester film to form a dot shape and control the density of dot sites. In the reproduction light, light is reflected at the dots of the metal, and light transmission is formed at the dots of the non-metal dots and adjusted. The ratio of transmission and reflection makes it possible to see through the hologram and at the same time the images and texts hidden under the images. It is also called a perspective hologram. It is currently used in California's driver's license, Indonesian police work permit, and China's mainland and Taiwan identity cards. The transmissive hologram is a multi-layer transparent medium plated on the hologram stripe so that the hologram can be seen at a certain angle of view, and at the other angle it becomes almost the packaging machine'target=_blank>transparent film. It also reveals the graphic images covered below, and its performance is better than that of translucent holograms. It can be used on documents and passports.
Since the introduction of the first laser holographic image production line in China in the late 1980s, the produced laser anti-counterfeiting labels have once played a role in anti-counterfeiting and counterfeiting. In the future, as localities have swarmed, there are hundreds of manufacturers that can produce such logos at present. Due to many technical and management problems, some real logos are not easy to identify, and some emulation logos can be confusing. Reduce the original position of laser hologram in people's minds. However, if we can strengthen management, improve technology, produce high-quality three-dimensional holograms, it is still a simple method of anti-counterfeiting.
It is reported that there are color holograms, synthetic holograms, and password holograms (using a laser pen to read the information in the drawings), and edible holograms can be used for anti-counterfeiting of tablets.

2. Optically variable color film. According to the principle of interference between multilayer optical films, a multi-layer thin film structure layer has its specific reflection spectrum curve. This reflection spectrum changes with the change of the incident angle, that is, with the different viewing angles, there are color changes, such as golden, green, brown, blue, gray and other color changes.
At the end of the 1980s, the Canadian National Institute of Technology first introduced this technology and used it on the 1988 version of the 50 Canadian dollar bill. This film is placed in the upper right corner of this version of the 50 Canadian dollars and consists of five layers of zirconium oxide and silicon oxide films alternately laminated. When the banknote is tilted, the color of the film changes from golden yellow to green due to the interference effect of light. It is currently used on banknotes with denominations of 100 and 20 Canadian dollars.
U.S. company disassembles the plated discoloration film from the substrate and pulverizes it into small pieces of a certain size. These small pieces still retain the original discoloration characteristics. They are incorporated into the ink to synthesize the aforementioned refractive ink, which can be used to print anti-counterfeit printing. Products. The 1996 edition of the hundred-dollar bill has been printed with this ink in the lower right-hand corner of the face of the "100" denomination, straight as green, changing the viewing angle is black, it is reported that Taiwan also developed this ink, and said that such ink is used Color copiers copy, the ink is only black, can be identified fake. The Taiwanese banknote printing factory intends to use this ink to print money.
The Shanghai Institute of Technology and Physics of the Chinese Academy of Sciences has successfully developed the optically variable color film technology, which is now being put into production by Shanghai Otto Optoelectronics Co., Ltd. If you try to change the spectral characteristics of the film in the ultraviolet or infrared, you can also use the spectrophotometer or spectrophotometer to identify authenticity; if you add magnetic materials, you can also integrate anti-counterfeiting.

3, ultra micro prism diffraction pattern. The ultra-fine plastic ridge lines are arranged closely in parallel on the surface of the banknote or ticket to form a graphic identifier. Thousands of ridges can be arranged in the range of 2 to 54 cm in length. It looks like a plane to the naked eye, but because each ridge is close to the wavelength of visible light, it shows different colors when viewed in different directions.

4, hot color LCD. Liquid crystal is a substance between liquid and solid matter. It has fluidity and surface tension of liquid, and optical anisotropy and birefringence of solid crystal. The display liquid crystal changes color due to a change in temperature, and is also called a thermochromatic liquid crystal or a color changing liquid crystal. It has been widely used in aerospace, electronic engineering, medical inspection and a wide variety of handicrafts.
There are two major types of thermochromatic liquid crystals. Among them, the TM series products, when the temperature exceeds the set temperature threshold, the color disappears. When the set temperature threshold is reached, the color reappears. When the temperature is lower than the set temperature threshold, the color is not affected. . The color change can be adjusted before use. Now widely used in ceramics, glass, paper, textiles, plastics, discolored sweatshirts, color changing cups and other existing products listed. TC series products, when the temperature reaches the set temperature threshold, the color changes with temperature shows red, orange, yellow, green, blue, blue, purple, color temperature threshold can be any change, but the color can not be adjusted. When the temperature is higher or lower than the set temperature threshold, the liquid crystal is transparent, colorless, and the color of the substrate can be seen. TC series liquid crystals need to be processed using a special packaging process. Has been used for color changing metal jewelry, film thermometers, discoloration labels, and optical, electrical, magnetic and thermal field physical detectors. Thermochromic liquid crystal products need to be packaged in microcapsules, regardless of shape or material. Using the optical properties of the thermochromatic liquid crystals and the remarkable temperature change effects, various types of temperature-change anti-counterfeiting labels can be made.

5, super security logo. This is a high-tech heavy ion imaging technology introduced by Beijing Super Energy Technology Co., Ltd. Using a transparent plastic film of 5 to 10 mm as a raw material, heavy ion energy generated by a heavy ion generator is used to accelerate heavy ions to an energy of 80 MeV or more through an accelerator. An imaging mold is installed on the heavy ion channel to irradiate the imaged heavy ion beam onto the plastic film (time is 0.5-2ms). After being processed by a special process, an anti-counterfeit logo pattern composed of 1'105/cm permeated micropores can be formed on the plastic film. This pattern can be designed according to user requirements. This pattern is colorless before it is detected. During the test, the protective film attached on the surface is torn first, and then painted with a colored pen or pen in the pattern area of ​​the film, and then wiped clean by hand, leaving behind the corresponding color anti-counterfeiting pattern, the non-pattern area is not penetrated colour.
The main equipment of the super anti-counterfeiting label is the only national defense-controlled equipment in China, namely the heavy ion accelerator, which is exclusive and its products cannot be counterfeited. The manufactured anti-counterfeiting labels are not afraid of boiling water, are resistant to various inorganic acids, salts, and alcohols and are resistant to low-concentration lye at room temperature and can be used for long-term preservation. Colorful identification is available anytime, anywhere.

6. Atomic nuclear anti-counterfeiting technology.

7. RF identification anti-counterfeiting technology

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