| Ink composition |
| Color materials |
Including pigments and dyes. Pigments are divided into organic pigments and inorganic pigments. The former has bright colors, strong coloring power, and short drying time, so it is widely used in inks, such as azo and acyl cyanide pigments; the latter has good light resistance, heat resistance, solvent resistance, and hiding power, such as silver paste, titanium white, cadmium red, and chromium green. Pigments are colored in the form of colorant particles and do not dissolve. They are the most commonly used colorants in inks. Dyes are prepared into solutions when used, and color in molecular state, and the effect is not as good as pigments. Colorants can give inks different colors and color concentrations, and make the inks have a certain viscosity and dryness. |
| Connecting material |
It is one of the main components of ink, and acts as a medium for dispersing colorants and auxiliary materials. It is made of a small amount of natural resin, synthetic resin, cellulose, rubber street organisms, etc. dissolved in drying oil or solvent. It has a certain fluidity, so that the ink forms a uniform thin layer after printing, and forms a film layer with a certain strength of the binder after drying, and protects the pigment, making it difficult to fall off. The binder has a great influence on the printing suitability and printing effect of the ink, such as the transferability, brightness, and fixing speed. Therefore, it is critical to choose a suitable binder, and the composition and ratio of the binder should be adjusted at any time according to the different packaging materials, printing requirements, etc. |
| Auxiliary ingredients |
It includes fillers, diluents, anti-skinning agents, lubricants and some other auxiliary agents. |
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