Printing ink is a paste-like colloid composed of pigments, binders, fillers and other ingredients mixed uniformly. 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, etc. Therefore, to correctly understand and understand the role of ink components in the ink is of great significance to accurately adjust the characteristics of the ink, meet the creativity of various printing conditions, and improve the printing quality of the product.
1. What kind of connection can the color material play in the ink?
Colorants include pigments and dyes. The colored materials used in printing inks are usually pigments, and some dyes are also useful. They are all very fine colored particles. Pigments are generally insoluble in water or in binders. Most of them are in a suspended state in solution, while dyes are generally soluble in binders. 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 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 The drying property of the ink, especially the ink based on oxidative polymerization drying, is particularly outstanding. In addition, the durability of the ink in all aspects is determined by the pigment. Therefore, due to the different types and uses of inks, the use of pigments is also different. This requires that the ink should be selected according to the application and process characteristics of the product when printing. , Fast curing, wear-resistant ink to ensure printing quality.
2. What role does the binder play in the ink?
The binder is a fluid with a certain viscosity and viscosity, and its functions are various. As a carrier of pigments, it serves to mix and connect solid particles such as powdered pigments, so that the pigments that are stuck together can eventually adhere to the printed matter. While the binder affects and determines the fixing speed, drying speed and drying type of the ink, it can also give the ink certain physical properties such as gloss, friction resistance, yellowing resistance and impact resistance, and to a large extent Determines the viscosity, viscosity, yield value and fluidity of the ink, so high-quality inks originate from high-quality binders. If the preparation of the linking material or the production process is not suitable, the ink will not only lack bright and good gloss colors after printing, but also cause chain quality failures such as pasting, smearing, through-printing, pulling paper wool and no ink, etc. Bring certain obstacles. Therefore, the binder is a factor that greatly affects the ink quality.
3. What is the meaning of the filler at this time?
The filler is a white solid substance that can be uniformly and well dispersed in the binder, and is a fine powder. When the filler material is mixed and ground into a slurry after being ground, 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 consistency, viscosity, viscosity, fluidity and yield value of the ink, and on the other hand, it can adjust the ink density. The situation can be achieved by adding filler. Although the filler has an auxiliary role in the ink, its performance has many requirements that are consistent with the pigment. In the ink based on oxidative polymerization and drying, it also affects the dryness.
Fourth, the amount of additives in the ink can not be ignored
For printing operators, the printability of the ink is good, and it can be put into use as soon as the can lid is opened, which is of course the most convenient and trouble-free. However, due to differences in the temperature and humidity of the printing environment, the characteristics of the printing material and the printing process conditions, such as the paper's moisture content PH value, printer speed, and overprinting methods, etc., although the ink types are diverse, The ratio of pigments, binders and fillers used in the ink is almost constant, and often cannot meet the printability requirements of various conditions. Therefore, from the perspective of improving printing efficiency and quality, according to the changing printing conditions, adding appropriate additives in the selected ink is beneficial to ensure normal printing.
Fifth, what is the improvement of ink adjustment in printing
Commonly used ink inks are usually No. 6 and No. 0. Ink No. 6 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. No. 0 oil has a larger viscosity. When the ink viscosity is insufficient to cause ink color blooming or even poor ink distribution, the appropriate amount of No. 0 oil is loosely mixed and added to the ink to increase the viscosity and adhesion of the ink.
6. Auxiliary materials are the basis of composition comparison and performance application
The auxiliary materials in the ink are usually divided into anti-sticking agents, desiccants, additives, desalting agents, anti-friction agents, desiccants and varnishes. Cognition comes from cognition, but there is a deeper meaning in it, and how many people really realize that the author will share the acquired knowledge with everyone by consulting a lot of information. Let's talk about anti-sticking first. After adding an appropriate amount of anti-sticking agent to the ink, it can prevent the back of the sheet from being dirty due to the ink layer is not dry, thus ensuring the quality of the product; the desiccant is divided into white dry oil and red dry oil . Red dry oil is a kind of desiccant mainly based on cobalt naphthalate. It is a purple-red slurry liquid, suitable for adding to dark ink. Its drying form is based on the surface of the ink layer first drying, the dosage is 1% ï¼2%. White dry oil is composed of a mixture of metal salts of cobalt, manganese, and lead. It is commonly known as mixed dry oil. It has a complete drying effect on the inside and outside of the ink film. Its dryness is not as strong as red dry oil, but the drying effect is better, and It is white and translucent, and it has no effect on the hue after adding light-colored ink; the additive is a white transparent paste-like substance. After adding the ink in an appropriate amount, it can eliminate the fluffing and powdering of the paper to prevent the powder of the plate and the blanket. Blurring occurs; the desalting agent is an ointment-like transparent substance with good gloss and good printing performance. After adding color ink, it can play the printing process effect of diluting the hue of the ink; the friction-resistant agent is Wax paste made of polyethylene wax and high-boiling kerosene. Adding 1% to 5% of abrasion-resistance agent to the printing ink 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 point kerosene to form a wax paste. Adding 1% to 5% of abrasion resistance to the printing ink can improve the abrasion resistance of the printing ink layer and reduce the viscosity of the ink. Sticky chance; last Let's take a look at the varnish. In addition to the varnish, the ink on the relief printing surface is added with an appropriate amount of varnish, which can increase the fluidity of the ink, help the uniformity of the ink, and greatly improve the printing ink. The brightness of the film makes the ink layer have a certain effect of abrasion resistance, light resistance and fading prevention. Due to the fast light oil conjunctiva, the printing ink layer drying speed is also accelerated after the ink is added, so this point 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 existence of things has the truth of his existence. Like the auxiliary relationship between the ink's composition and performance, it is indispensable.
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