Application of the most popular pearlescent ink pr

2022-08-03
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Application of pearlescent ink printing

the printing industry is one of the main areas of pearlescent pigment application. Products printed with pearlescent ink include packaging, publications, home decoration materials or clothing, and even ceramic products and household appliances. People's aesthetic experience naturally accepts and affirms this effect, which is the main reason for pearlescent pigments to improve product quality and decorate life. This material has a considerable reserve; 3 is the reason for the two-dimensional layered material made of molybdenum oxide crystal

pearlescent printing can be implemented in the main printing methods, such as offset printing, gravure printing, flexo printing and silk screen printing. Through other surface finishing methods, such as glazing and gold sweeping, you can also obtain a unique gloss effect. According to their specific process requirements and the characteristics of pearlescent pigments, make relevant adjustments to the ink, so as to achieve satisfactory pearlescent effect. In addition, attention should also be paid to the coordination of relevant process parameters, which can be consulted with suppliers such as German Merck

compared with traditional pigments, pearlescent pigments have great differences in chemical composition, structure and morphology, as follows:

(I) relatively large particle size: Taking offset printing as an example, the particle size of ordinary pigments is generally 0.02 to 0.08 microns, and that of carbon black is 0.2 to 0.7 microns, while the size of pearlescent pigments used for printing has basically achieved the "1025" plan target of meters to 25 microns in the 5 micro new material industry, which is much higher than the former. Larger particle size brings some difficulties to printing transfer

(II) lamellar structure: this structure is determined by the shape of mica core and is also the basis for expressing pearlescent effect. However, the transfer of printing may be inconvenient to many enterprises. In the preparation of ink, high speed, large shear force or excessive rolling operation cannot be applied, otherwise the pigment will be damaged

(III) surface morphology: the micro surface of pearlescent pigment is composed of many grooves, which makes it have quite high surface energy

in order to avoid the trouble caused by the above characteristics in the actual printing, the main pearlescent pigment suppliers (such as Merck) have summarized some practical and effective experience on the basis of years of research for printing inks and printing manufacturers to adopt:

pre wetting of pigments: wetting the pigments before mixing them into the inks. The solvent used for wetting shall be compatible with the ink system. Good wetting can make the pigment evenly dispersed into the ink, which is the basis for obtaining high-quality pearl printing effect. Wetting can also overcome the "dusting" phenomenon of dry powder during dispersion

dispersion of pigments in inks: pearlescent pigments have good dispersing ability. In low viscosity inks, low-speed mixing is generally enough. Try to avoid using three roller machine, high-speed mixer or ball/bead mill and other equipment, which will cause the pigments to break and lose luster. It is recommended to mix the pigments in the final stage of ink production. When using a disperser or high-speed mixer, the mixing time of each batch shall be kept constant and minimum

select the ink medium with good transparency: whether it is the ink color or binder, the transparency is an important factor affecting the pearl gloss of the ink

the distribution characteristics of pigments determine the effect: the more pearlescent pigments are distributed in the printing coating and the better the uniformity is, the better the pearlescent effect will be; Another point is also very important: the ideal pearlescent effect can be obtained only when the pigment chips are arranged in parallel with the substrate surface

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