Fluorescent ink introduction
Fluorescent ink is one of the more 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 the external light (including ultraviolet light) shines, it can absorb the energy of a certain shape, and stimulate the photons to release the absorbed energy in a low visible light manner, and then generate Fluorescence of different hue. The combination of different color lights constitutes an unusually bright color, and when the light stops shining, the luminescence phenomenon disappears, and thus is called a fluorescent pigment.
The fluorescent pigment is mixed with the polymer resin binder, the solvent and the auxiliary agent, and the fluorescent ink can be obtained by grinding. This ink, which is invisible to the naked eye, only emits light under ultraviolet or infrared light, precisely because of its transformable and hidden features and its inability to be accurately copied on a colorful copier. This ink is used in the specialty printing industry. The use of it is more comprehensive.
Fluorescent inks are suitable for printing on paper and vinyl films. Since the inorganic phosphor is emitted by the crystal, if the pressure is too large, the crystal is broken, and then the luminance is lowered. Therefore, the relief printing is generally not used, which is suitable for screen printing and gravure printing.
The rheological properties of most fluorescent inks are pseudoplastic and have low viscosity. This feature determines that the printing process is quite different from the general ink printing process. In the case of gravure printing and screen printing, in addition to paying attention to its viscosity, bonding materials, boring and other characteristics, it is also necessary to pay attention to the conditioning of the printing pressure, can not make the printing pressure too large and affect the printing effect.
When doing screen printing, pay attention to the following points:
(1) The fluorescent ink is suitable for a mesh of 200 mesh or less;
(2) When the ink quantity of the printed matter is 50-60g/m2, its color and light resistance are more ambitious;
(3) When the substrate is a bright object, a white ink should be printed first, which can improve the fluorescence.
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