Metal printing inks are mainly composed of pigments, binders, fillers and auxiliary agents. In addition to the printability of general offset inks, metal printing inks should also have characteristics such as impact resistance, strong adhesion, heat resistance, light resistance, and resistance to cooking.
Due to the impermeability of the surface of the metal printing material, dot gain tends to occur. Compared with paper printing inks, metal printing lithographic offset printing should use high viscosity inks. The surface of the metal is poor in water absorption, and too much wetting water on the plate will easily cause the emulsification of the ink. Therefore, the water and ink balance on the plate should be achieved by controlling the thickness of the water film on the plate and the amount of ink applied.
In the metal printing, in order to improve the adaptability of the post-press processing, and to make the surface of the print have a certain degree of gloss, the glazing treatment should be performed before the printing ink is not completely dried to form a uniform and smooth coating film to avoid bleeding. phenomenon. At the same time, the metal printing ink should have a certain hardness and toughness, can not change its properties when repeated heating, the base color coating and coating oil should have good adhesion.
Due to the impermeability of the surface of the metal printing material, dot gain tends to occur. Compared with paper printing inks, metal printing lithographic offset printing should use high viscosity inks. The surface of the metal is poor in water absorption, and too much wetting water on the plate will easily cause the emulsification of the ink. Therefore, the water and ink balance on the plate should be achieved by controlling the thickness of the water film on the plate and the amount of ink applied.
In the metal printing, in order to improve the adaptability of the post-press processing, and to make the surface of the print have a certain degree of gloss, the glazing treatment should be performed before the printing ink is not completely dried to form a uniform and smooth coating film to avoid bleeding. phenomenon. At the same time, the metal printing ink should have a certain hardness and toughness, can not change its properties when repeated heating, the base color coating and coating oil should have good adhesion.
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