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The viscosity of the ink has a great influence on the printed product. Assuming that the viscosity of the ink is too large, the phenomenon of ink transfer unevenness and the build-up of ink on the adhesive tape can easily occur, and on the surface of the paper, the viscosity of the ink is too large, and the problem of peeling off occurs. On the other hand, if the viscosity of the ink is too small, It is easy to cause dot expansion and ink emulsification. It is worth noting that the temperature is related to the viscosity of the ink. If the temperature rises, the viscosity of the ink decreases; otherwise, the viscosity increases. Understand the relationship between the two, when printing it is easier to grasp the viscosity of the ink.
Why does the ink roller have a problem with a UV ink?
In general, the material of the ink roller is synthetic rubber, but these substances cannot coexist peacefully with UV inks. The acetate monomer and photoinitiator in the UV ink easily react with the rubber, resulting in swelling of the ink roller. As the ink roller expands, it easily moves away from the drum and becomes inaccurate when overprinted. The edges of the image are not clear.
When printing yellow, it is difficult to grasp its color standard. Is there any solution?
Because the yellow ink is light-colored, it is not easy to identify its ink volume and network dot level. To accurately determine its color level, here are some precautions: Check the outline of the printing plate with the release lens before printing, and check whether it is the original dot. The same size. In general, the printing plate is allowed to be slightly smaller than the original printing spot, but if it exceeds the original printing plate, the printing spot is too dark.
When checking colors, pay attention to the light and light source. Different time and light source environments can affect the vision and make the same color darker or lighter illusion.
To check the yellow color more clearly, you can check the yellow proof with blue sunglasses.
Why prints lose their luster?
This is usually due to the addition of too much solvent to the ink, which relatively reduces the amount of resin, making the ink dry and conjunctivae unsmooth, so the print will lose its luster. In addition, some solvents contain high amounts of ethanol, which volatilizes too quickly. The ink has not yet leveled, the resin has cured, and the conjunctiva naturally does not smooth, reducing the gloss of the print.
What are the precautions for using water-based inks?
This type of ink is very susceptible to the weather, when the temperature is higher, the ink flowability is greater, the viscosity is reduced, the transfer roller will thus slip, the ink will even drip down; and when the temperature is lower, the ink is weak , becoming thick and hard, will also affect the quality of the print. While controlling the ink, carefully control the amount of additive to ensure its viscosity and fluidity; in addition, the pH of the fountain solution can only be between 4 and 5.
What is the role of cobalt and manganese?
Many inks use cobalt and manganese as desiccants. Cobalt can accelerate the drying process of the ink surface, but it should be noted that cobalt is easily dissolved in organic acids, so an acidic fountain solution with a pH of less than 4 will have an effect on it. As for manganese, it can accelerate the internal drying of the ink and is more powerful than cobalt.
How to prevent the anti-print (bottom) situation when printing gold and silver ink?
This is related to the excessive amount of ink and the quality of the paper. It should be printed with appropriate ink and high quality paper. In addition, many companies use a gold and silver ink on different types of paper. This is incorrect. Since different types of paper have their own printability, appropriate inks should be used to match. The relevant information can be asked by the supplier.
Ink knowledge 7 question and answer
If the viscosity is too large or too small, what is the impact on the printed product?