How to identify high quality UV ink?

Observe ink color

When purchasing UV ink, "check the color". UV gloss ink is sensitive to ultraviolet light, and if the UV ink continues to be exposed to ultraviolet light (such as sunlight and fluorescent lamps) after construction, the UV ink will continue to react and turn yellow, which is the defect of the UV ink itself. For conventional UV inks, it cannot be fundamentally improved for the time being, but the degree of yellow of UV inks from different suppliers is not the same, unless specific non-yellows or ultra-white UV inks are used.

For the color change of UV ink after polishing, the main reason is the ink problem. There are some pigments in the ink, such as light blue, is a blue acid lake pigment, is an organic dye triphenylmethane attached to the physical pigments such as aluminum hydroxide, the formation of insoluble pigment pigments in water, low price, bright color, but its light resistance, solvent resistance and alkali resistance is poor, alcohol and other solvents or alkali, the red phase is easy to dissolve, weaken or disappear. These pigments, such as the use of book ink (the surface is no longer polished after printing) is feasible, but if used in color box ink, it is very dangerous, because most color boxes are processed after processing. The detection method is to drop a drop of bottom oil and ink on the surface of the ink, and see whether the ink is discolored after 1 hour, which is very obvious.

For the printed paper, if the ink is discolored, you can use forced ink drying, such as drying or placing a little more time to solve, or use neutral oil, solvent-free UV ink, solvent-free UV ink for books and magazines to reduce the ink discoloration tendency.

Distinguish ink taste

When we buy the ink in the "taste" evaluation of the smell of UV ink there are two indicators, one is the smell in the construction process, the main source is the residual solvent in UV ink, under normal circumstances, the residual solvent amount is less than 2%, under special circumstances, such as cigarette UV ink requirements of less than 0.5%, but in today's soaring oil prices, Many suppliers in order to reduce the cost of UV ink, add a large number of solvents, such as alcohol and toluene, the highest can reach 25%, which is detrimental to the long-term development of UV ink and environmental protection.

Another indicator to evaluate the smell of UV ink is the residual smell of UV ink after construction, placed for a long time after the general time can not disappear, the main source is the improper selection of UV ink, the use of some large but cheap chemicals, this point to fundamentally improve there is a certain difficulty, mainly cost and the choice of appropriate materials.

The more important point is the price of the purchase of UV ink, and the price of the purchase of UV ink should be evaluated from the brand and cost performance of the ink. Many ink multi-level suppliers are uneven in good and bad, and may buy products with high prices without comparison, or ink products are not authentic. When we purchase UV ink, we also have to consider the problem of transportation costs, so it is very important to choose a reasonable price and trustworthy ink supplier. Recommend the domestic great printing consumables online mall my consumables network, buy any printing ink on the website, printing materials are very convenient, just a few clicks of the mouse you can buy the ink you want. The price of the ink sold is as low as the factory price, which is the preferred platform for printing companies and printing factories to purchase ink.