The fineness of the ink refers to the particle size of the pigment (including filler) in the ink and the uniformity of the pigment and filler distributed in the binder. Therefore, how the fineness of the ink not only reflects the quality of the printed product, but also affects the printing durability of the printing plate.
The process practice shows that the color printing products are printed with screen printing or the solid layout contains small negative characters and negative lines. The printing process is prone to scumming and dirty quality failures. If you do not check and analyze them carefully, you may fall into misunderstandings and think that the ink The consistency is uncomfortable, the viscosity is too large, the ink volume is too large, or the pressure is too large, and some wrong adjustments are made blindly. As everyone knows, the real reason is that the fineness of the ink is not good, that is, the particles of the ink are too coarse.
We know that the fineness of ink is directly related to the nature of pigments, fillers and particle size. In general, the ink made with inorganic pigments (not including carbon black) is not fine and the particles are coarser, which has a great relationship with the ink rolling process. The more times the ink is ground during the rolling process, the more uniform it is, the larger the contact surface of the pigment particles and the binder, the finer the ink particles, and the better and more stable the printing performance. Obviously, the fineness of the ink is closely related to the quality of the printing. For example, in the case of a printed screen, there are many high- and mid-tone 1-4 dots on the layout. If the ratio of ink particles to dot area is close If it is, it is easy to make the dots empty or spread, and even the printing defects of unclean spots appear, so the finer the ink, the more clear and full dots on the printed matter. In addition, the better the fineness of the ink, the greater the concentration, the stronger the coloring power, and the higher the printing quality of the product.
The fineness of the ink is low, the particles of the pigment are coarse, and the coefficient of friction during the printing process is large, so the printing durability of the printing plate is low. And the ink with coarse particles is easy to produce paste and ink accumulation during printing, as well as uneven transmission and distribution of ink. The fineness of the ink can generally be judged by visual observation, that is, the surface scraped by the ink knife is smooth. The uniform visual effect shows that the fineness of the ink is good. If there is a rough layer of small pieces or particles in the scraped surface, the fineness of the ink on the surface is poor. In addition, you can also use a piece of coated paper to dip a little ink layer, and then use another piece of paper to grind the ink layer, until the ink layer is dragged to a very thin layer, it is still very smooth, indicating that the ink is fine. If there are marks on the ink layer, it is obvious that the marks are caused by coarse particles of pigment and filler in the ink, indicating that the fineness of the ink is not good enough. Of course, the above is only based on empirical judgment, and the accuracy of judgment has certain limitations. To achieve standardized and data-based judgments, only by relying on the fineness meter to measure the size of the pigment particles can the fineness of the ink be detected more accurately. The specific method of measuring the fineness of the ink with a fineness meter is to dilute the sample ink to a certain degree, put it in the deepest part of the fineness meter, and then use a scraper to move the groove (to maintain a uniform speed) to the shallowest place. The particle size of the ink can be seen at the scale on both sides of the groove. In addition, a microscope can also be used to observe the size of the ink pigment particles.
In summary, how fine the ink is is very sensitive to the quality of the printed matter. To print high-quality products, it is necessary to have high-definition ink as a guarantee. Therefore, correctly understand the relationship between the ink fineness and printing quality, strengthen the detection of ink fineness, choose the ink that is suitable for the characteristics of the prints scientifically and rationally, avoid the blindness in the operation process, prevent one or other printing defects The occurrence of quality failures and the practical improvement of product printing quality and printing efficiency are of great significance.
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