Most popular talk about the relationship between i

2022-08-11
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On the relationship between ink composition and ink performance

printing ink is a paste colloid composed of evenly mixed ingredients such as pigment, binder and filler. As a viscous fluid, ink has different properties due to its different varieties, that is, thick and thin, viscosity difference, fast drying and slow drying and so on. Therefore, a correct understanding and understanding of the role of ink components in ink is of great significance for accurately adjusting ink characteristics, meeting the suitability of various printing conditions, and improving product printing quality

I. The role of pigments in inks

pigments include pigments and dyes. The colors used in printing inks are usually pigments, but there are also some dyes, which are color substances with very fine particles. Pigments are generally insoluble in water and binder, and partially suspended in solution, while dyes are generally soluble in binder. Pigments have a great influence on ink. The relative density, transparency, heat resistance, light resistance and chemical resistance of ink are all related to pigments. The role of pigment in ink is obvious. Its color depends on the microcomputer interface to determine the hue of ink; Its dosage determines the ink concentration; Its use gives the ink a certain degree of flute and other physical properties; Its use affects the dryness of the ink to a certain extent, especially the ink based on oxidation polymerization drying. In addition, the durability of ink in all aspects is also determined by pigments. Therefore, due to the different types and uses of inks, the pigments are also different, "Hu Qianlin said, which requires that appropriate inks should be selected according to the use of products and process characteristics when printing. For example, when printing products with high-speed multi-color printing machines, bright, fast curing and wear-resistant inks should be selected to ensure the printing quality

second, the role of binder in ink

binder is a fluid with a certain viscosity and viscosity, and its role is multifaceted. As the carrier of pigments, it plays a role in mixing and connecting solid particles such as powdered pigments, and making the adhesive pigments finally adhere to the printing plate. Binder can not only affect and determine the fixing speed, drying speed and drying type of ink, but also give ink certain physical properties such as gloss, friction resistance, yellowing resistance and impact resistance under specified experimental conditions and requirements, and to a large extent determine the viscosity, viscosity, yield value and fluidity of ink. Therefore, high-quality ink comes from high-quality binder. If the connection preparation or production process is not suitable, the printing ink will not only lack bright and glossy colors after printing, but also cause chain quality failures such as plate pasting, rubbing, through printing, drawing paper wool and non inking, which will bring certain obstacles to normal printing. Therefore, domestic five gold plastic enterprises should overcome the adverse factors such as high raw material prices, increasingly fierce market competition, and serious excess production capacity of some products. Binder is a factor that greatly affects the quality of ink. (Kang qilai, Putian County printing factory, Fujian Province) (Guangdong packaging)

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