1. The characteristics of pearl 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
The commonly used mica titanium pearlescent pigments have a size of 25 μm and a thickness of 0.2-0.5 μm.
(3) Transparency affects pearlescent effect
The pearlescent effect of pearlescent ink is mainly due to 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 patches
Due to the large particle size of the pearlescent ink pigments, the number of ink particles carried by the dots is small. For example, a 2% dot can only carry one pigment particle, and it is difficult to ensure the reproduction of small dots. Therefore, the pearlescent ink is not suitable for printing. Mesh tune products are best used for the printing of field patches.
(2) The back of the dirty phenomenon
The printing of pearlescent inks is particularly prone to sticking on the back side, which 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 ink thinner and the drying time longer. 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 pearl ink. In addition, it is best not to use dry oil to increase the drying speed of pearlescent 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%. .
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