The anti-counterfeiting function of fluorescent ink in ticket printing

Fluorescent ink is one of the more commonly used inks in ticket printing, and its main component is fluorescent pigment. Fluorescent pigments are functional luminescent pigments. The difference from ordinary pigments is that when external light (including ultraviolet light) is irradiated, they can absorb a certain form of energy, and excited photons release the absorbed energy in the form of low visible light, resulting in a difference Fluorescence of hue. Different colors of light combine to form unusually bright colors, and when the light stops irradiating, the luminescence phenomenon disappears, so it is called a fluorescent pigment. Fluorescent pigment is mixed with polymer resin binder, solvent and auxiliary agent, and fluorescent ink can be prepared by grinding. This ink, which is invisible to the naked eye, only emits light under ultraviolet or infrared light. It is precisely because of its switchable and hidden characteristics and the characteristics that it cannot be accurately reproduced on a color copier, making the ink in the special printing industry Application is more popular.

Special inks that emit ultraviolet light (200-400nm) and emit visible light (400-800nm) are called ultraviolet fluorescent inks. According to the different excitation wavelengths, it is divided into short wave and long wave. The excitation wavelength of 254nm is called short-wave ultraviolet fluorescent ink, and the excitation wavelength of 365nm is called long-wave ultraviolet fluorescent ink. According to the change of color, it is divided into colorless, colored, and color-changing. Blue and other colors; colored can make the original color shiny; changing color can make one color become another color.
Fluorescent inks are suitable for printing on paper and vinyl films. Since the inorganic phosphor emits light from the crystal, if the pressure is too large, the crystal may be broken, thereby reducing the brightness of the light. Therefore, relief printing is generally not used, and it is very suitable for screen printing and gravure printing. The rheological characteristics of most fluorescent inks are pseudoplastic flow, and the viscosity is small. This characteristic determines that the printing process is very different from that of ordinary inks. When performing gravure and screen printing, in addition to paying attention to its viscosity, connecting materials, drying properties, etc., we must also pay attention to the adjustment of its printing pressure, so that the printing pressure cannot be too large and affect the printing effect.
When performing screen printing on fluorescent inks, pay attention to the following points:
(1) Fluorescent ink is suitable for screens below 200 mesh;
(2) When the ink amount of the printed matter is 50 ～ 60g / ?, its color development and light resistance are ideal;
(3) When the substrate is a transparent object, the white ink should be printed once, which can improve the fluorescent effect.

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