Overview of the link between ink composition and performance
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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, due to the different properties of its varieties, there are differences between thick and thin, 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.
1. What kind of connection can the colorant play 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, what role does the binder play 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, what is the meaning of the filling material at this time?
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 amount of additives in the ink can not be ignored
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.
5. What does varnish improve in printing?
Commonly used varnishes usually have numbers 6 and 0. No. 6 varnish is used to increase the fluidity of the ink, improve the transferability of the ink, and reduce the concentration, viscosity and dryness of the ink. Oil No. 0 has a large viscosity. When the viscosity of the ink is insufficient to cause ink coloration or even poor ink, an appropriate amount of No. 0 oil is loosened and added to the ink to increase the viscosity and adhesion of the ink.
Sixth, auxiliary materials are the basis for composition comparison and performance application
Auxiliary materials in inks are generally classified into anti-adhesives, desiccants, additives, degreasers, anti-friction agents, anti-drying agents, and varnishes. Knowing the understanding, but the deeper meaning of it, and how many people really realize that the author will share the knowledge gained by consulting a large amount of information. Let's first say anti-sticking. After adding proper amount of anti-adhesive agent to the ink, it can prevent the backside from being dirty due to the ink layer not being dried in the stack of the printed sheets, thus ensuring the product quality; the desiccant is divided into white dry oil and red dry oil. . Red dry oil is a desiccant mainly composed of cobalt naphthalate. It is a purple-red slurry liquid. It is suitable for adding to dark ink. The dry form is mainly dry on the surface of the ink layer, and the dosage is 1%. -2% between. White dry oil is composed of a mixture of metal salts of cobalt, manganese and lead. It is commonly known as mixed dry oil, which has the function of fully drying the inside and outside of the ink film. The dryness is not strong, but the drying effect is better. It is white translucent, and has no effect on the hue after adding light ink; additive is a white transparent paste-like substance. After adding an appropriate amount of ink, it can eliminate the phenomenon of paper falling and falling powder to prevent the surface and blanket from being powdered. The blighting agent is a kind of ointment-like transparent substance, which has good gloss and good printing performance. After adding color ink, it can play the printing process effect of diluting the ink hue; the anti-friction agent is Formulated with a wax paste from polyethylene wax and high-boiling kerosene, adding 1%-5% of the abrasion resistant agent to the printing ink, which can improve the abrasion resistance of the printing ink layer, and reduce the viscosity of the ink to reduce the chance of sticking. It is made of polyethylene wax and high-boiling kerosene into a wax paste. Adding 1%-5% of the abrasion resistant agent to the printing ink can improve the abrasion resistance of the printing ink layer and reduce the viscosity of the ink. Stick to chance; finally Let us look at the varnish. In addition to the glazing oil, the ink of the letterpress printing ink is added with an appropriate amount of varnish, which not only increases the fluidity of the ink, but also facilitates the uniformity of the ink and greatly improves the printing ink. The brightness of the film makes the ink layer have a good effect of wearing, drying and preventing fading. Since the bright oil conjunctiva is fast, the drying speed of the printing ink layer is also increased after the ink is added, so this should be fully considered when adjusting the ink.
Conclusion
From this we can recognize some problems, that is, some superficial things that we usually can't see. In today's world, we can allow the existence of some things. After all, the things that exist have the truth of his existence. Just like the auxiliary relationship between the composition and performance of the ink, it is indispensable.