More and more label printing plant began to try to use flexographic printing ink products, but since most of the captain label printing using UV inks have become accustomed to, so when using ink always feel not comfortable with.
What knowledge points do you need to pay attention to? Tags ask experts to talk.
Flexo ink pH
When printing with flexo UV inks, the captain can hardly pay attention to the ink, as long as there is ink in the ink tank. However, if you use flexographic ink, the captain should always pay attention to the change of the pH value of the ink and add the pH adjuster in time. This is the biggest difference between flexo ink and flexo UV ink.
Q: Which interval is the most reasonable for controlling the pH of the flexographic aqueous ink?
A: The general standard for the pH value of the flexographic aqueous ink is between 8.0 and 9.5. In fact, strictly speaking, 8.5 to 9.0 is the intermediate value. Whether it is printing a large area of ​​the field, a large area of ​​mesh, or a combination of outlets and the field, the pH of the flexo aqueous ink is usually no problem if it is guaranteed within this range.
Q: What is the effect of too high or too low pH of the flexo aqueous ink on printing?
A: Relatively speaking, the printing mesh needs better resolubility when adjusting the product, and the pH value can be slightly higher.
If the pH value is too low, the ink will be precipitated, the ink will thicken, and the viscosity of the ink will increase;
When the pH is too high, the drying speed of the ink layer is slow and the viscosity of the ink is lowered.
Additives in flexo ink
Usually, from the point of view of the usability of the machine, the ink factory will provide some additives for the flexographic water-based ink, but these additives are not necessary, and should be added in appropriate amounts.
Commonly used additives include: defoamer, pH adjuster, quick-drying agent, slow-drying agent, leveling agent, thickener, transfer agent, etc. Adding an excessive amount of additives to the ink or improperly adding it may cause pinhole-like leakage.
Adding an excessive amount of additives to the ink or improperly adding it causes pinhole-like printing
Flexo ink viscosity
Flexo presses with different speeds require water-based inks with different viscosities, and different viscous cups may have different ink viscosities. At present, there are many brands and specifications for the viscosity cups on the market. The printing factory needs to consult its own ink supplier in detail, and try to use the viscosity cup brand and model that are consistent with the ink supplier.
Q: What effect does ink viscosity have on printing? A
The viscosity of the water-based ink not only affects the thickness of the printing ink layer, that is, the depth of the color, but also affects the drying speed, and the viscosity is too high, and the mesh portion is easy to paste.
Q: What effect does the viscosity of the water-based ink have during the printing process?
A: The viscosity of the water-based ink changes too much during the printing process. The most direct effect is that the color difference of the ink layer changes greatly. In extreme cases, it may also affect the printing effect of the mesh image, and water spots appear in the field.
Ink may not be as easy to use as UV inks, but as long as you master its principles and methods of use, it is not complicated, and it also has a certain cost advantage.
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