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In recent years, with the rapid development of China's printing industry, the ink manufacturing industry has also grown and developed, especially in the special varieties of ink market prospects. As a special kind of ink, the pearl ink market prospects are widely optimistic in the industry. In the printing of high-grade cosmetics, high-grade trademarks and promotional materials, pearl ink has strong competitiveness and development potential. The printing effect of pearlescent ink is generally determined by visual reflection of the pearlescent effect, brightness and color effect. The printing method is different, and the effects of the products vary greatly. The commonly used printing pearlescent inks mainly include silk screen printing, gravure printing, offset printing , flexographic pearlescent ink, etc., and the offset pearlescent ink has a fine pearl-like luster and a strong refractive index, which can greatly improve the grade of the printed matter. The products produced by the products are not only beautiful, but also have certain anti-counterfeiting effects, which are favored by the majority of merchants and consumers.
All packaging materials and labels can be printed with pearlescent offset printing inks. Offset pearlescent inks are relatively more difficult to use than silkscreen and flexographic printing techniques. Because of the relatively high viscosity, pearlescent pigments are particles that are ground with shells. Soluble in it, it is difficult to mix pearlescent pigments and offset inks, even if mixed together, the distribution of pearlescent pigments is not uniform. This means a big challenge for offset printing. In the application process of offset pearlescent ink, not only the proper blending of the ink and the correct selection and careful treatment of the substrate, but also the selection of suitable printing equipment according to the characteristics of the pearlescent pigment and the application of advanced technology in printing, in order to achieve the best Pearlescent effect.
First, the brittleness and thickness of pearlescent pigments
At present, the commonly used pearlescent pigments are generally composed of anatase or rutile titanium dioxide coated mica flakes, and the sheet structure is very brittle and extremely easily broken. At the same time, the offset pearlescent ink has strict requirements on the fineness of the pigment. For example, the fineness of the mica titanium pearlescent pigment is below 25 μm. If the pigment particles are too coarse, the transferability of the pearlescent ink is poor, but if the pigment particles are too fine, the pearlescent effect is affected.
Second, the viscosity and fluidity of the ink
The speciality of the offset pearlescent ink pigment requires that the ink has lower viscosity than other common inks and has high fluidity, and can meet the floating requirement of the pearlescent pigment when printing, thereby achieving an ideal pearlescent effect.
Third, the transparency of the ink
The pearlescent effect of pearlescent inks depends on the refraction and interference of the incident light. Therefore, the transparency of the offset pearlescent ink has a great influence on the pearlescent effect. If the transparency of the ink layer is poor, the original sufficient light will be absorbed and affect the pearlescent effect.
Offset pearlescent ink printing precautions
1. Selection or treatment of substrates. The surface of the substrate should be as smooth and flat as possible to better align the pigment orientation. Because the ink layer in the offset is relatively thin, this is extremely important for achieving the desired pearlescent effect.
2, the pigment particles are large, easy to block the screen, if you find blocking the network, foaming phenomenon, you should immediately stop the machine, thoroughly cleaned with alcohol water.
3, pay attention to the control of drying speed
The printing ink layer of the offset pearlescent ink is relatively thick, and the drying speed of the ink is slower than that of the ordinary offset printing ink. At this time, the method of adding the desiccant can not be adjusted, but the temperature and humidity of the paper and the printing environment need to be controlled. The ambient temperature should be controlled at 25±3°C, and the relative humidity should be controlled at about 55%. It should not be accelerated, and the heating temperature should be sharply dried.
4, try not to use the screen to print
Pearlescent pigments need to be arranged in order to achieve a satisfactory pearlescent effect. Screen printing is not conducive to the orderly arrangement of pigments. Relatively speaking, pearlescent inks are more suitable for the printing of solid color blocks.
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