Common types of security ink printing and security technology Analysis
First, the concept of principle Security ink With security features of the ink. Security ink is a very important anti-counterfeiting technology, application of very wide areas, involving many disciplines. It is in the ink specially developed to add some special material which has anti-counterfeiting features a special ink, used in printing Security printing Products. Its formula, process is confidential, should be strictly controlled; its products should also be fixed, regular supplies to designated factory, set machine to use the designated persons, prevent proliferation.
1) photosensitive ink security In the visible light irradiation can be issued under the ink. Here, the light include: ultraviolet, infrared light, sunlight, etc. visible and invisible light.
A. UV Fluorescent ink : UV (200-400nm) irradiation, can send visible light (400-800nm) of the ink. Usually refers to visible short-wave UV excitation fluorescence security printing inks, excitation wavelength 254nm, visible ultraviolet excitation fluorescence security printing inks, excitation wavelength is 365nm.
B. Sunlight excitation color ink: In sunlight, the visible light 400-800nm can be issued the security printing inks. This ink from the application view of the role is due to sunlight color, substance was subjected to ultraviolet radiation and change color.
C. IR security inks: using infrared (700-1500nm) have different absorption characteristics of ink made of a match, and through equipment testing or identification of its mark. To a pair of the infrared absorption characteristics of different substances are made by adding ink. Infrared printing ink products formed, under ordinary light without any response, and infrared detection, it can be observed in the corresponding signal or graphic.
2) heat-sensitive security ink Under the heat, can occur in the ink color effects. Usually divided into reversible and irreversible thermochromic ink security; often referred to color temperature of 34-100 degrees Celsius. Security ink is hand color temperature thermal ink color of a security, means the temperature at 34-36 degrees Celsius under the action of color effects can occur in the ink. Thermochromic heat principle is to make color compounds in cases of physical changes or chemical changes brought about its own absorption changes.
3) pressure-sensitive security ink Friction under pressure, the color of ink can appear. In ink by adding special chemical reagents or discolored material made of. This ink printed with a colored or invisible graphic, when the use of hard objects or tools to friction, compression, that is the pressure of the chemical breakdown of discoloration or dye microcapsules were missing and there colors (red, blue, ink, green, purple, yellow, etc.). According to the requirements of users choose to display the color and design markings.
4) magnetic anti-counterfeit ink Using a magnetic powder material as a function of elements in the security printing ink production. It was the most common applications of the security ink, its prominent feature is the appearance of color depth, simple instrumentation, and more applied to ticket forgery.
5) optical variable ink security Optical interference effects can occur with multi-layer optical thin film flakes dispersed material produced as a powder, mark in the light incidence angle of 90 degrees Celsius and 30 degrees Celsius, the different ink colors. This technology is extremely complex, expensive, can produce very few countries, have been used in foreign banknotes.
6) anti-alteration security ink
Of the altered chemical used chemical reaction with the ink color.
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