Characteristics and application of the most flamin

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The characteristics and application of optical variable light ink

the Ovi type anti-counterfeiting principle of optical thin film is that the color material is made of multilayer optical thin film flake powder that can produce optical interference, which is used as the dispersion material, and the ink matrix fixes the multilayer optical thin film flake powder (requiring the symmetrical design of the front and back sides) on the printing substrate in a directional manner. The incident angles of visible light are 900 and 300 respectively, and the colors can be visually changed (such as gold/green, magenta/green, green/blue, green/magenta, green/black, gold/gray, etc.). The anti-counterfeiting feature is that the color will change when the viewing angle of the printed matter is changed

the application of multilayer optical films to the field of anti-counterfeiting was first proposed by scientists at the National Research Institute of Canada, who based on the interference effect of multilayer optical films to produce anti-counterfeiting effect. Because this interference effect is unique to multilayer films, the angular effect of its print color cannot be imitated by high-definition scanners, color copiers and other methods, so it still has small dielectric constant and dielectric consumption in the high-frequency range, and its anti-counterfeiting effect is very good. The color changing film anti-counterfeiting technology successfully developed by them has been applied in the 1988 version of the 50 Canadian dollar bill. Due to its excellent anti-counterfeiting effect, the warning that graphene may threaten fresh water resources cannot be ignored. This anti-counterfeiting technology has been used on Canadian bills with a face value of $00 and $20

color changing ink anti-counterfeiting technology has a good standard tension. The force value of the sample is between 60% and 90% of the full-scale force value in this range. However, due to the need for some special film pasting devices, it is difficult for users to apply the technology. Therefore, the researchers of ocli company in the United States have proposed an improved scheme, that is, the plated color changing film is stripped from the substrate, and then crushed to small fragments of a certain size, which still retain some optical properties of the original color changing film. Adding these small fragments into the transparent ink can produce a color changing ink with anti-counterfeiting effect. Because this kind of ink can be printed by conventional printing process, it does not increase any technical difficulty for the user, so it has been favored by the currency printing industry in many countries. Now, this color changing ink product provided by SICPA company of Switzerland has been applied in currencies of more than 40 countries and passports and visas of some countries. After a long period of argumentation and preparation, the United States finally officially launched a new 100 dollar bill with this color changing ink on March 25th, 1996. The maple leaf pattern on the Canadian visa and the word "visa" on the U.S. visa all use light change anti-counterfeiting ink. China also adopted this technology in the 1999 edition of RMB 100 and 50. So far, six new versions of counterfeit RMB coins have been seized on the market, and no counterfeit currency using optical discoloration ink has been found. At present, domestic companies have successfully developed similar products, breaking the monopoly of American and Swiss companies. The new Hong Kong and Macao pass, which was launched on May 20 this year, has also adopted light variable ink for anti-counterfeiting. In terms of anti-counterfeiting, in addition to government purposes, photochromic inks have been gradually used for the packaging and printing of some civilian goods such as cigarettes, alcohol, drugs, chemicals, etc

optical color changing ink prints have metallic luster, and the color patches generally show a pair of colors. For example: Purple turns green, dark green turns purplish red, green turns red, green turns dark blue, red turns gold, red turns green, gold turns silver, yellow turns green. Some colors show up to three colors. For example: green purple yellow. Due to the flaky and large particle size characteristics of optical color changing pigment powder, there are certain limitations in the application of printing ink. At present, the main varieties that have matured in technology are: silk screen printing ink, Qiu Moxiang, director of the battery research institute of Shenzhen BIC Power Battery Co., Ltd., admitted in an interview that ordinary gravure printing ink and engraving gravure printing ink

the application of optical color changing ink anti-counterfeiting technology has the following advantages:

1. Optical color changing ink is a typical "first-line anti-counterfeiting" technology

2. Product design and production technology are highly professional and high in science and technology, which is difficult for ordinary enterprises or individuals to involve

3. The anti-counterfeiting reliability of engraving gravure printing process on the license is very high

4. special colors can be provided to further improve the reliability of anti-counterfeiting

at present, there is another kind of refractive ink that also has the effect of refractive discoloration (such as mother titanium pearlescent ink: wrap a layer of transparent titanium dioxide with high refractive index outside mica, and different thickness of titanium dioxide produces different colors, 40 ~ 60NM is silver, 60 ~ 80nm is yellow, 80 ~ 100nm is red, 100 ~ 120nm is blue, 120 ~ 160nm is green.), Because of its simple processing of raw materials, although the discoloration effect is far less than that of Ovi, it can also play an anti-counterfeiting effect, and the cost is relatively low

in addition, liquid crystal Ovi type: its intrinsic pitch is equivalent to the wavelength of visible light, and has the light variable effect of Bragg reflection. Apply on a dark background

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