Characteristics of the most popular high-tech inks

Characteristics of several high-tech inks (1)

Author: with the continuous improvement of printing quality requirements, Qi Cheng also puts forward higher requirements for 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 good print quality, but also meet a variety of special needs such as environmental protection, anti-counterfeiting and so on. Therefore, the emergence of magnetic inks, fluorescent inks, photochromic inks, thermotropic inks and so on has made the development of the printing industry leap to a new height. Next, we will briefly introduce the characteristics and uses of several high-tech special inks

I Nano ink

(1) from the ink fineness and purity

we know that the fineness and purity of ink have a great impact on the quality of printed matter. To print high-quality products, we must have fineness and pure height of ink as a guarantee. The fineness of ink refers to the size of pigment (including filler) particles in the ink and the uniformity of pigment and filler distribution in the binder. It not only reflects the quality of printing products, but also affects the print resistance of printing plates. The process practice shows that the color printing products contain small negative words and lines in the pattern printing or field layout, which is prone to paste, layout infection and quality failure in the printing process. If you do not carefully check and analyze, you may fall into the wrong operation, thinking that the ink consistency is not appropriate, and the white pollution is contained in the production source. The viscosity is too large, the ink quantity is too large, or the pressure is too large, and blindly make some wrong adjustments. But it was caused by poor ink fineness. The fineness of ink is directly related to the properties of pigments, fillers and the size of particles. Generally speaking, the ink made of inorganic pigments (excluding carbon black) has coarse particles. This has a lot to do with the rolling process of ink. The more times the ink is ground in the rolling process, the more uniform it will appear, the larger the contact surface between the pigment particles and the binder will be, the finer the ink particles will be, and the better and more stable its printing performance will be. Take the printing plate as an example, there are many high-profile and middle tone points on the plate. If the proportion of ink particles and dot area is close, it is easy to make dots empty or fluffy, and even the printing defect of rough dots appears. Therefore, the higher the fineness of the ink, the clearer and fuller the dots on the print

the fineness of ink is low, the particles of pigment are coarse, the friction coefficient is large in the printing process, and the printing plate's printing resistance is low. At present, it is easy to produce the phenomenon of plate pasting and ink accumulation, as well as the uneven ink transmission and distribution. Generally, the fineness of the ink can be judged by visual observation, that is, if the surface scraped by the ink knife shows a smooth and uniform visual effect, it indicates that the fineness of the ink is good; If there is a small or granular rough layer on the scraped surface, the fineness of the ink is poor. In addition, you can also use coated paper to dip a little ink layer, and then use another piece of paper to polish the ink layer. When the ink layer is dragged to a very thin layer, it is still very shiny, indicating that the ink fineness is good. If there are traces in the ink layer, it is obvious that the traces are caused by coarse particles of ink pigments and fillers. Of course, the above is only based on experience, and the accuracy of discrimination has certain limitations. In order to realize standardized and data-based judgment, only relying on the fineness meter to measure the size of pigment particles (the experimental data cannot be saved and printed), can the fineness of ink be detected more accurately. The method is: dilute the sample ink to a certain extent, place it in the deepest part of the fineness meter, and then use a scraper to control the groove to move (keep a constant speed) to the shallowest place. The particle size of the ink can be seen at the scales on both sides of the groove, and the size of the ink pigment particles can also be observed with a microscope

(2) characteristics of nano ink

nanotechnology is a new science and technology. Nano is a unit of length, M. the research object of this technology is mainly nano materials. Nanomaterials have now begun to penetrate all fields. In 1994, Xmx, a Massachusetts company in the United States, successfully obtained a patent for nano-sized uniform particle raw materials used in the manufacture of inks. Because nano gold should be coated with antirust oil on the surface, it is a kind of particle that can absorb all light waves and make itself black. At the same time, it has scattering effect on light. Therefore, using these characteristics, nano metal particles can be added to black ink to produce nano ink to improve its purity and density. In addition, semiconductor nanoparticles exhibit certain characteristics of light absorption due to the significant quantum size effect and surface effect. (continued next...)