Talking about the composition of ink and its relationship with printing quality
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The printing ink is a paste-like colloid composed of a mixture of a coloring material, a binder, a filler and the like. As a kind of viscous fluid ink, the performance of the variety is also poor, that is, there are thick and thin points, viscous strength difference, fast drying and slow drying. Therefore, correctly understanding and understanding the role of the components of the ink in the ink is of great significance for accurately adjusting the characteristics of the ink, satisfying the creativity of various printing conditions, and improving the printing quality of the product.
First, the role of colorants in the ink
Pigments include pigments and dyes. The colored materials used in printing inks are usually pigments, and some dyes are also used, which are all very fine colored materials. Pigments are generally insoluble in water and do not dissolve in the binder, and most of the solution is in suspension, and the dye is generally soluble in the binder. Pigments have a great influence on the performance of the ink. The relative density, transparency, heat resistance, light resistance and resistance to chemicals of the ink are all related to the pigment. The role of the pigment in the ink is obvious. Its color determines the hue of the ink; its amount determines the concentration of the ink; its use gives the ink a certain consistency and other physical properties; its use affects to a certain extent Ink drying, oxidative polymerization and drying-based inks are particularly prominent. In addition, the durability of the ink in all aspects is also determined by the pigment. Therefore, due to the variety of inks and uses, the use of pigments is also different. This requires that the inks should be selected according to the product's use and process characteristics when printing. For example, high-speed multi-color printing presses should be used to print products. Fast, wear-resistant inks to ensure print quality.
Second, the role of the binder in the ink
The binder is a fluid with a certain viscosity and viscosity, and its function is multi-faceted. As a carrier of the pigment, solid particles such as a powdery pigment are mixed and joined, and the pigment which adheres to the film can be finally adhered to the printed matter. The binder affects and determines the fixing speed, drying speed and drying type of the ink, and gives the ink a certain physical property such as gloss, abrasion resistance, yellowing resistance and impact resistance, and to a large extent The viscosity, viscosity, yield value and fluidity of the ink are determined, so high-quality inks are derived from high-quality binders. If the preparation of the binder or the production process is unsuitable, the ink will not only lack bright, lustrous color, but also cause chain quality failures such as paste, smudge, offset, pull paper and no ink, for normal printing. Bring some obstacles. Therefore, the binder is a factor that greatly affects the quality of the ink.
Third, the role of filler in the ink
The filler is a white solid substance which can be uniformly and well dispersed in the binder, and is a fine powder. When the filler is slurried after being mixed and ground in the binder, some are transparent and some are opaque. Commonly used fillers are aluminum hydroxide, potassium sulfate, magnesium carbonate, and calcium carbonate. In the ink, the filler can adjust the ink consistency, viscosity, viscosity, fluidity and yield value on the one hand, and adjust the ink concentration on the other hand, that is, when the ink concentration is large, the hue is deep. In the case, after adding the filler, the diluting effect can be achieved. Although the filler has an auxiliary side in the ink, its performance has many requirements consistent with the pigment, and it also affects the dryness in the ink mainly composed of oxidative polymerization drying.
Fourth, the role of additives in the ink
For the printing operator, the printing performance of the ink is good, and the can opener can be put into use, which is of course the most convenient and convenient. However, due to the difference in temperature and humidity of the printing environment, the characteristics of the printing material and the printing process conditions, such as the water content of the paper, the pH value of the printing machine, the speed of the printing machine, the printing method, etc., although the ink varieties are diverse, each The ratio of pigments, binders, and fillers used in inks is almost constant, and often does not meet the printability requirements of various conditions. Therefore, from the viewpoint of improving the ergonomics and quality of printing, it is advantageous to ensure proper printing in accordance with the various printing conditions in which the additives are appropriately added to the selected ink.