With the continuous improvement of printing quality requirements, higher requirements are also put on inks. Today, with the rapid development of science and technology, various inks continue to appear and are used in general printing, special printing, anti-counterfeiting printing and other fields. They not only require excellent print quality, but also meet various special needs such as environmental protection and anti-counterfeiting. Therefore, such as magnetic ink, fluorescent ink, photo-induced ink, temperature-induced ink, etc., so that the development of the printing industry jumped to a new height. The following is a brief introduction to the characteristics and uses of several high-tech special inks.
Nano ink
(1) Talking from the fineness and purity of ink
We know that the fineness and purity of ink have a great influence on the quality of printing. To print high-quality products, it is necessary to have fine and pure ink as guarantee. The fineness of the ink refers to the size of the pigment (including filler) particles in the ink and the uniformity of the pigment and filler distributed in the binder. It not only reflects the quality of the printed product, but also affects the durability of the printing plate. rate. The process practice shows that the screen printing of color printing products or the solid layout contains small negative characters and negative lines. The printing process is prone to paste-up, layout infection, and quality failures. If you do not check and analyze carefully, you may fall into misunderstandings. I thought that the consistency of the ink was uncomfortable, the viscosity was too large, the ink volume was too large, or the pressure was too large, and I made some wrong adjustments blindly. Who knows that it is caused by poor ink fineness. The fineness of the ink is directly related to the nature of the pigment and filler and the size of the particles. In general, inks made with inorganic pigments (excluding carbon black) have coarser particles. This has a great relationship with the ink rolling process. The more times the ink is ground during the rolling process, the more uniform it will be, 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 will be. Take the printed screen version as an example, there are many high- and middle-tone dots on the layout of 1-4%. If the ratio of the ink particles to the area of ​​the dots is close, it is easy to make the dots empty or spread out, and even the dots are not smooth. The shortcomings of printing. Therefore, the higher the ink fineness, the more clear and full dots on the printed matter.
The fineness of the ink is low, the particles of the pigment are coarse, the coefficient of friction is large during printing, and the printing durability of the printing plate is low. It is also 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, if it shows a smooth and uniform visual effect, it means that the fineness of the ink is good; if the scraped surface appears small pieces If the rough layer is in the form of particles or particles, the fineness of the ink is poor. In addition, you can also use a piece of coated paper with a little ink layer, and then use another piece of paper to drag 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 ink pigment and filler. 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 method is: 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, and the ink can be seen on the scales on both sides of the groove The size of the particles can also be observed with a microscope to determine the size of the ink pigment particles.
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