How to adjust the printability of ink components

  • Detail

How to adjust the printability of each component of ink

printing ink is a paste colloid formed by the uniform mixing of pigments, binders, fillers and other components. As a viscous fluid ink, due to its different varieties, the performance is also different, that is, there are thick and thin, viscosity strength differences, 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 creativity of various printing conditions, and improving product printing quality

I. The role of pigments in inks

pigments include pigments and dyes. The colored materials used in printing inks are usually pigments. There are also some dyes, which are colored substances with very fine particles. Pigments are generally insoluble in water and binder, and most of them are in suspension in solution, while dyes are generally soluble in binder. Pigments have a great influence on the performance of inks. The relative density, transparency, heat resistance, light resistance and chemical resistance of inks are all related to pigments. The role of pigment in ink is obvious, and its color determines the hue of ink; Its dosage determines the ink concentration; Its use gives ink a certain consistency 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 matching of pigments is also different, which requires that appropriate inks should be selected according to the use and process characteristics of the products during printing. For example, when printing packaging products with high-speed multi-color printing machine, 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 print. 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, 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 binder preparation or production process is not suitable, the printing ink will not only lack bright and glossy colors after printing, but also lead to 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, binder is a factor that greatly affects the quality of ink

III. The role of fillers in inks

fillers are white solid substances that can be evenly and well dispersed in binders, which are fine powders. When the filler becomes paste after mixing and grinding in the binder, some are transparent and some are opaque. Commonly used fillers include aluminum hydroxide, potassium sulfate, magnesium carbonate and calcium carbonate. Fillers 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 to say, when the ink concentration is large and the hue is deep, fillers can be added to dilute the ink. Although filler plays an auxiliary role in ink, its performance is consistent with that of pigment. It also plays a role in affecting the dryness in ink mainly based on oxidative polymerization and drying

IV. The role of additives in ink

for the printing operator, the printing adaptability of the ink is good, and it can be put into use as soon as the can cover is opened, which is of course the most convenient and easy. However, due to the differences in the temperature and humidity of the printing environment, the characteristics of the printing materials and the printing process conditions, such as the water content and pH value of the paper, you can safely use our experimental machine. The speed of the machine and the overprint method are different. Although the ink varieties are diverse, the proportion of pigments, binders and fillers used in each ink is almost constant, which often cannot meet the printing suitability requirements of various conditions. Therefore, from the perspective of improving printing efficiency and quality, according to the changing printing conditions, it is beneficial to add some additives to the selected ink to ensure normal printing

1. function of inking oil

commonly used inking oils are No. 6 and No. 0. No. 6 inking oil is used to increase the fluidity of ink, improve the transmissibility of ink, and reduce the concentration, viscosity and dryness of ink. No. 0 oil has a large viscosity. When the ink viscosity is insufficient, causing ink color to be scratchy or even poor ink distribution, loosen an appropriate amount of No. 0 oil, mix it evenly and add it to the ink to increase the viscosity and adhesion of the ink

2. The function of debonding agent

debonding agent is a wax paste like mixture with loose and lubricating texture. After adding an appropriate amount of ink, it can reduce the viscosity of the ink, reduce the problems of paper fuzzing and powder dropping, and improve the uniformity of ink distribution

3 Function of anti adhesion agent

over bottom imprinting is a common fault in color printing process. After adding an appropriate amount of anti adhesion agent to the ink, it can prevent the back from being dirty due to the wet ink layer in the stack of printing sheets, so as to ensure the product quality

4. The role of additives

it is a white transparent paste like substance. After adding an appropriate amount of ink, it can eliminate the phenomenon of paper wool and powder dropping, so as to prevent the occurrence of the problem of page layout and blanket powder stacking

5. The function of diluent

diluent is a transparent material in the form of ointment, which has good gloss and good printing performance. After adding color ink, it can dilute the hue of the ink

6. Function of friction resistant agent

it is a wax paste made of polyethylene wax and high boiling point kerosene. Adding 1% - 5% wear-resistant friction agent to the printing ink can improve the wear resistance of the printing ink layer, reduce the viscosity of the ink and reduce the chance of dirt

7. role of anti drying agent

after adding the ink, the anti drying agent can inhibit the oxidation and polymerization of the ink and slow down the drying speed of the ink conjunctiva. Spraying anti drying agent on ink transfer carriers such as ink rollers can stop drying, which brings convenience to stop and start printing in the middle of printing

8. the role of desiccants

desiccants are divided into white dry oil and red dry oil. Red drying oil is a kind of desiccant based on cobalt naphthenate, which is a purplish red slurry liquid. It is suitable for adding in dark ink. Its drying form is to dry the surface of the ink layer first, and the dosage is between 1% and 2%. White drying oil is a mixture of metal salts of cobalt, manganese and lead, commonly known as mixed drying oil, which has a comprehensive drying effect inside and outside the ink film. Its dryness is not as strong as that of red drying oil, but its drying effect is better, and it is white and translucent, which has no effect on the hue after adding light color ink

9. Function of gloss oil

gloss oil is not only used for glazing, but also used for checking the key points and operating procedures of relief printing field rubber tensile testing machine. Adding an appropriate amount of gloss oil to the ink can not only increase the fluidity of the ink, which is conducive to the uniformity of ink distribution, but also greatly improve the brightness of the printing ink film, so that the ink layer has a certain good effect of wear resistance, sun resistance and color fading prevention. Due to the fast film formation of gloss oil, the drying speed of printing ink layer is also accelerated after adding ink, so this situation should be fully considered when adjusting ink

in short, the composition and auxiliary of ink Solvay: a breakthrough in high temperature resistant materials -technyl? Redx material is the basis of ink and imprinting. Understanding and mastering this knowledge and understanding the performance and use method of ink are of great significance to printing efficiency and product quality and avoiding blindness in operation technology

Copyright © 2011 JIN SHI