Talking about the matters needing attention in printing with pearlescent ink
The pearlescent effect of pearlescent 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 choosing an ink binder or varnish, choose a material with the best possible transparency. 1. Features of pearlescent ink (1) Pigment is vulnerable Pearlescent pigments are made of titanium dioxide (or other metal oxides) coated with mica. They have a flaky structure and are very fragile and can be easily destroyed. (2) Large particle size of pigment Commonly used mica titanium pearlescent pigments have a size of 25 μm and a thickness of 0.2 to 0.5 μm. (3) Transparency has an effect on the pearlescent effect The pearlescent effect of pearlescent 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 choosing an ink binder or varnish, choose a material with the best possible transparency. 2. Precautions for use (1) Suitable for printing of solid color blocks Due to the large particle size of pearlescent ink pigments, there are few ink particles carried on the dots. For example, a 2% dot can only carry one pigment particle. It is difficult to ensure the reproduction of small dots. Therefore, pearlescent ink is not suitable for printing Mesh tone products are best used for the printing of solid color patches. (2) Dirty phenomenon on the back When printing pearlescent ink, the backside is particularly prone to staining. This is mainly due to the large size of the pearlescent pigment particles, and in order to increase its fluidity, a large amount of binder is added, which makes the ink thinner and the drying time longer. The following measures can be taken to control and solve: First, strictly control the temperature and humidity of the workshop, the temperature is controlled at about 20 ℃, 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 the appropriate amount of powder spraying in the delivery section, but it should be noted that the amount of powder spraying should not be too large, otherwise it will affect the gloss of the pearlescent ink. In addition, it is best not to use dry oil to increase the drying speed of pearlescent ink. If you must use dry oil, you must use white dry oil. Red dry oil will affect the appearance of pearlescent effect, and the amount of dry oil should not exceed 2%. . Foshan Liqia Hardware Products Co., Ltd. , https://www.liqiamei.com