• Categories:Technical Support
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• Time of issue:2020-12-07
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(Summary description)The ink of an inkjet printer is the most important part of the printer. Ink for inkjet printers is different from general writing inks, it requires high thermal stability and chemical stability. It requires moderate viscosity, has the characteristics of high concentration, low molecular weight, good fluidity, and clear image layers. From the perspective of the composition of inkjet printers, the main materials are solvents and colorants, and additives such as antioxidants and viscosity modifiers are also added.

Solvent occupies the largest proportion in inkjet printer ink and is the main component, which directly affects the physical and chemical properties of the ink, printing quality, printer printing speed, stability and other properties. However, the types of ink for inkjet printers are classified according to the colorants in the ink. The performance of the colorant directly affects the color and tone of the printed image, and its own color, mixing performance, solubility, acidity and alkalinity, and particle size are particularly important. Color inkjet printing mainly adopts the subtractive color mixing method in the mixed color inkjet technology, and uses complementary colorants such as yellow, blue, and magenta. Since the black produced by the subtractive color mixing method does not look black enough, black is added in order to obtain pure black to improve the print quality. The quality of the image overprinted by each color ink is completely dependent on the colorant's own performance and the effect of overprinting with other colorants.

Ink for inkjet printers is mainly divided into two categories: dyes and pigments according to colorants. Pigments generally exist in the solvent in the form of particles, while dyes are dissolved in the aqueous solvent in molecular form. The dye molecules dissolve in the ink and penetrate or absorb into the surface of the substrate such as paper with the solvent. Because the dye can form a stable and uniform phase in the molecular state and solvent, the image printed by dye ink has high resolution and good clarity, but it has poor light resistance and water resistance, and it is mostly used in indoor occasions. In pigment ink, particles are dispersed into the ink, and the pigment particles remain on the surface of the substrate such as paper, so the color intensity and gloss of the printed image are high. At the same time, when it is exposed to the external environment or sunlight, it is resistant to light and high temperature decomposition, and is suitable for outdoor use, but the fineness of the pigment particles is very high.