Introduction of several high-tech ink features (1)

With the continuous improvement of the printing quality requirements, higher requirements have been put forward for inks. With the rapid development of science and technology, various types of inks are constantly appearing in the fields of ordinary printing, special printing, and security printing. They not only require excellent quality of printed products, but also meet various special needs such as environmental protection and anti-counterfeiting. As a result, the emergence of such as magnetic ink, fluorescent ink, photo-induced changeable ink, temperature-varying ink, etc., has brought the development of the printing industry to a new height. Below, we briefly introduce the characteristics and uses of several high-tech specialty inks.
1. Nano-ink (1) From the ink fineness and purity we know that the fineness and purity of the ink have a great influence on the quality of the printed matter. To print high-quality products, we must have a fine, high-grade ink as a guarantee. The fineness of ink refers to the size of the pigment (including filler) particles in the ink and the uniformity of the pigment and filling material distributed in the binder. It reflects both the quality of the printed product and the printing plate. rate. The practice of the process shows that the color printing products use net printing or field layout to contain small Yin and Yin lines. During the printing process, stencils, layout infections, and quality failures are likely to occur. If they are not carefully checked and analyzed, they may be caught in operational errors. The ink thickness was uncomfortable, the viscosity was too large, the amount of ink was too large or the pressure was too high and blind adjustments were made blindly. Who knows is caused by the fineness of the ink. The fineness of the ink is directly related to the nature of the pigments, fillers, and the size of the pellets. In general, inks made with inorganic pigments (excluding carbon black) have coarser particles. This has a lot to do with the rolling process of the ink. The more the ink is ground during the rolling process, the more uniform it becomes, the greater the contact surface between the pigment particles and the binder, the finer the ink particles, and the better and more stable the printing performance. For example, in the case of printed reticulated screens, there are no shortages of 1-4 percent screens in the high-profile and intermediate tone layouts. If the ratio of ink particles to the dot area is relatively close, then it is easy to make the dots empty or spread, and even the dots are not clean. The printing defects. Therefore, the higher the fineness of the ink, the clearer and fuller the dots on the print.
The fineness of the ink is low, the coarse particles of the pigment, the friction coefficient during the printing process are large, and the imprint resistance rate of the printing plate is low, and the phenomenon of stencil and ink deposition and the inconsistent transmission of ink and ink are easily generated during printing. The fineness of the ink can generally be judged by naked eye observation, that is, the surface scraped by the ink knife shows a smooth and uniform visual effect, indicating that the fineness of the ink is good; for example, a small scraped surface appears. A coarse or granular roughened layer has poor fineness of the ink. In addition, it is also possible to use a small amount of ink layer on the coated paper, and then use another layer of paper to grind the ink layer until the ink layer is dragged to a very thin, which means that the ink is fine. If traces of ink appear, it is clear that the traces are caused by ink pigments, filler coarse particles. Of course, the above is judged only by experience, and the accuracy of discrimination has certain limitations. To achieve standardized, data-based judgment, only rely on fineness meter to determine the size of pigment particles in order to more accurately detect the fineness of the ink. The method is: dilute the sample ink to a certain degree, place it in the depth of the fineness meter, and then use the scraper to treat the groove movement (to maintain a constant speed) to the shallowest place, and the ink can be seen on the scale marks on both sides of the groove. The size of the particles can also be used microscopically to observe the size of the ink pigment particles.
(2) Characteristics of Nano Ink Nanotechnology is a new science and technology. The nanometer is a length unit, which is 10-9m. The research object of this technology is mainly nanomaterials. Nanomaterials have now begun to penetrate various fields. In 1994, the XMX Corporation of Massachusetts, USA, has successfully obtained a patent for the production of nano-sized uniform fine particle materials for inks. As the nano-metal particles can absorb all the light waves and make themselves appear black, they also scatter light. Therefore, by using these characteristics, nano-metal particles can be added to the black ink, and the nano ink can be manufactured to increase its purity and density. In addition, due to the existence of significant quantum size effects and surface effects, semiconductor nanoparticles exhibit a certain degree of absorption of light.