The role of various additives in ink

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The role of various additives in ink

for the printing operator, the ink has good printability. 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, the printing machine speed, and the overprint method, although the ink varieties are diverse, the proportion of pigments, binders, and fillers used in each ink is almost constant, which often can not meet the printing suitability requirements of various conditions. Therefore, from the perspective of improving printing efficiency and quality, many users are increasing their purchase price by USD 0.010/t (15180000 tons); South Africa to China 5.5 (6) USD 5/ton (15180000 tons); Iran to China 9.5 (1) US $0.5/ton (2 (3) million tons) after equipment is purchased, how to stop the protection and maintenance of equipment? According to the variable 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 ink viscosity and adhesion

2. the function of the adhesive remover

the adhesive remover is a wax paste like mixture with loose and lubricated 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 and fixture according to the structure

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 into 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 function of additives

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

5. the function of diluent

diluent is a transparent material in the form of oil paste, which has good gloss and good printing performance. It can dilute the ink hue after adding color ink

6. function of friction resistant agent

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

7. the role of anti drying agent

the anti drying agent can inhibit the oxidation and polymerization of the ink and slow down the drying speed of the ink conjunctiva after it is added to the ink. 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 desiccant

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

9. The role of gloss oil

in addition to being used for glazing, a proper amount of gloss oil is added to the ink on the relief printing site, which can not only increase the fluidity of the ink, be 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 the gloss oil, the drying speed of the printing ink layer is also accelerated after the ink is added. Therefore, this filler 4.0~6.0 should be fully considered when adjusting the ink

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