zhaoyang:
First, let's analyze the problem of why black is not printed black. (In fact, all dark inks are harder to print than light inks.) Because the paper is white, if there is not enough ink to seal the paper, the black and black The contrast of the paper white will be visible, and the problem of inaccurate printing will occur, so it seems that it is necessary to increase the ink layer to cover the paper white, but unrestricted increase in the amount of ink will lead to other black patterns Some of the problems cause drying problems. Imported high-density inks have deep pigments. For the same amount of ink, the colors printed by high-density inks will be darker than ordinary inks, and they will be better for paper. Covering, while not excessively increasing the amount of ink, leading to a series of problems such as dot deformation. If you use imported ink (generally high density, but also have a low density, don't choose the wrong one), if you can't print well, you can only start from other aspects.
When designing a large area of ​​black, it is necessary to make a net of less than 50% on the blue version, overlapping the large area of ​​black. The black effect printed in this way is much better. If you want to achieve better results, generally use a large area of ​​black as a component color version, that is to say, the black is printed by the CMYK mesh overlay method, so the printed black effect is very good and very shiny. Of course, it is sometimes a good idea to print the black twice, but the second overprint will cause registration problems and increase the cost of working hours. In short, keep in mind that it is basically difficult to print a perfect black area without overlapping colors. Of course, we must first check the pressure of the ink roller on the machine, the condition of the rubber, the old and new versions of the rubber pad, which will cause the problem of false printing.
bille:
Try putting a little light blue in the black ink! Using as little water as possible, controlling the amount of water is also an important factor to ensure the gloss of the ink layer! Reduce the speed of the machine! Do not add additives to the ink!
zhaoyang:
Controlling the amount of water can also play a very good effect, but the effect of adding the light blue is not so obvious, it is better to separate the blue net and the black solid overprint when separating colors. Our factory specializes in printing and exporting packaging. Some of the films are taken by foreign customers themselves. I think their blacks are all superimposed with CMYK mesh, and the printed effect is very good.
belli:
I tried it myself and it worked well! Just add the light blue ink is very oily, pay attention to control!
What you said is also a way to increase the thickness of the ink layer in disguise! It's worth using!
zhaoyang:
You tried it yourself, I believe it should be possible.
But I want to add the light blue to increase the thickness of the ink layer. The only increase is the coverage and the unique reflection effect of the light blue. It can be used if the paper is very good. When the paper is not in good condition, it is better to use the color stacking method. Especially for CMYK overlay, if there is ink shit and paper hairs, they can be covered and can not be seen. And I am afraid that it will not be so easy. And the black superimposed by CMYK is very textured and shiny. It's by no means the same.
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