? UV fluorescent inks can be printed by various methods such as screen printing, gravure printing, embossing, offset printing, and flexographic printing. With the development of screen printing technology and equipment, screen printing has become an ideal printing method for fluorescent ink in recent years. The screen printed fluorescent ink prints can form uniform ink film layers, which is necessary for good gloss, stability and weatherability. Since the particle size of the photoluminescent pigment in the fluorescent ink is coarser than that of the conventional pigment, the fluorescent ink generally uses a lower mesh (usually 80 to 150 mesh) screen in screen printing, and is only used for comparison. Rough printing. However, with the continuous emergence of new fluorescent ink products, the particle size of their pigments has become finer and finer screen printing products have now been fully printed. The rheological characteristics of most fluorescent inks are pseudo-plastic flow, and the viscosity is small. This characteristic determines that the printing process is very different from the printing process of ordinary inks. In screen printing, the tension of the screen is high, and an appropriate squeegee is selected to increase the thickness of the ink layer, thereby improving the luminescent effect of the ink. Since the inorganic fluorescent substance emits light from the crystal, if the pressure is too high, the crystal will be broken and the luminous brightness will be reduced. Therefore, in addition to stickiness, connection material, and drying property, the printing pressure should be paid attention to during screen printing. The adjustment can not make the printing pressure too large and affect the printing effect. In fluorescent ink printing, pay attention to the following questions.