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1. The characteristics of pearlescent anti-counterfeiting ink
(1) Pigment Vulnerability: Pearlescent pigments are made of titanium dioxide (or other metal oxides) coated with mica. They have a flake-like structure and are very fragile and can easily be destroyed.
(2) Large particle size of pigments: The commonly used titanium pearlescent pigments with mica have a size of 25 μm and a thickness of 0.2-0.5 μm.
(3) The transparency has an influence on the pearlescent effect: The pearlescent effect of the pearlescent anti-counterfeiting ink mainly comes from the refraction and interference of incident light. If the transparency of the ink layer is low, the originally abundant light will be absorbed and lost. Therefore, when selecting the ink binder or varnish, choose the material with the best transparency.
2. Use caution
(1) Suitable for the printing of solid color blocks
Due to the large particle size of Pearlescent anti-counterfeiting ink pigments, there are fewer ultraviolet fluorescent ink particles carried on the dots. For example, a 2% dot can only bear one pigment particle, and it is difficult to ensure the reproduction of small dots. Therefore, pearlescent anti-counterfeit Ink is not suitable for printing halftone products, and it is best used for the printing of solid patches.
(2) The back of the dirty phenomenon
Printing pearlescent anti-counterfeiting inks are particularly prone to dirt on the back side. This is mainly due to the large size of the pearlescent pigment particles, and in order to increase their fluidity, a large amount of binders have been added, thus making the special inks relatively thin and drying time. Extended. The following measures can be taken to control and solve: First, strictly control the workshop temperature and humidity, the temperature is controlled at about 20 °C, and the humidity is controlled at about 55%. The second is to keep the amount of water as small as possible while ensuring the balance of water and ink. The third is to spray powder in the delivery section, but it should be noted that the amount of dusting can not be too large, otherwise it will affect the gloss of pearlescent anti-counterfeiting ink. In addition, it is best not to use dry oil to improve the drying speed of pearlescent anti-counterfeiting inks. If you must use dry oil, be sure to use white dry oil. Red dry oil will affect the appearance of pearlescent effect, and the amount of dry oil should not exceed 2 %.
Pearlescent anti-counterfeiting ink is a kind of special ink that is made of synthetic inorganic crystal material, natural pearl mica powder and other special colored pigments, pearlescent pigments and corresponding linking materials. It can make printing products have a particularly beautiful brilliance. Before the printing process, the following things must be noted: