The hottest nano anti-counterfeiting printing ink

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Nano anti-counterfeiting printing ink has caused waves in the printing industry

from the ink fineness and purity

as we all know, the fineness and purity of ink are very important to the quality of printed matter. To print high-quality products, we must have high fineness and high purity ink as a guarantee. Therefore, improving the fineness and purity of ink is an important part of the study of new ink

ink fineness refers to the size of pigment (including filler) particles and pigments in ink. Uniformity of filler distribution in binder. Therefore, how the fineness of ink affects both the quality of printing products and the print resistance of printing plates. In the process practice, color printing products are printed with pattern plates. The field layout contains small negative words and lines, which is prone to quality problems such as paste and dirty during the printing process. If not carefully checked and analyzed, it is likely to fall into the wrong operation, thinking that the ink consistency is inappropriate, the viscosity is too high, the ink quantity is too large or the pressure is too large, and blindly make some wrong adjustments. As everyone knows, the real reason lies in the poor ink fineness

ink fineness is directly related to the properties of pigments, fillers and particle sizes. Generally, the ink made of inorganic pigments (excluding carbon black) has low fineness and coarse particles, which is closely related to the rolling process of the ink. The more times the ink is ground in the rolling process, the finer the ink particles, the larger the contact area between the pigment particles and the binder, and the better the printing performance. Obviously, the fineness of ink is closely related to the quality of printed matter. Take the printing plate as an example, if the proportion of ink particles and dot area is close, it is easy to make dots empty or fluffy, and even have printing defects of rough dots. Therefore, the higher the fineness of ink, the clearer and fuller the 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. On the contrary, if the fineness of ink is low, the particles of pigment are coarse, and the friction coefficient is large in the printing process, the printing plate's printing resistance is low. And the ink with coarse particles is also prone to paste, ink accumulation, and uneven ink transmission and distribution during printing. The fineness of the ink can generally be observed and judged with the naked eye, 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 moderately good in the local enterprises interviewed. If there is a small or granular rough layer on the scraped surface, it indicates that the fineness of the ink is poor. In addition, you can use coated paper with a little ink, and then use another piece of paper to grind the ink layer. If the ink layer is still very shiny until it is dragged to a very thin layer, it indicates that the ink fineness is good. If there is a trace on the ink layer, it is obvious that the trace is caused by the coarse particles of pigments and fillers in the ink, which indicates that the ink fineness is not good enough

of course, the above is only based on experience. When selecting them, we need to select the appropriate tensile machine according to the type of test materials. The accuracy of data collection, analysis, calculation and discrimination by microcomputer processing chip has certain limitations. In order to realize standardized and data-based judgment, only by relying on the fineness meter to measure the size of pigment particles, can we accurately detect the fineness of ink. The specific method of measuring the fineness of the ink with the fineness meter is to dilute the sample ink to a certain extent, place it in the deepest part of the fineness meter, and then move the groove (keep a constant speed) to the shallowest place with a scraper. The size of the ink particles can be seen at the scales on both sides of the groove. In addition, the size of ink pigment particles can also be observed with a microscope

characteristics of nano ink

nanotechnology is a new high-tech, and the research object is mainly nano materials. Nano materials are current high-tech products, which have developed rapidly and began to penetrate into various fields. They have successfully obtained a variety of application materials with special properties, which can be described as a new milestone in the history of material development. Based on the various characteristics of nano materials, applying it to the ink system will bring great impetus to the ink industry. Experiments show that the absorption of light waves by nano metal particles is different from that of ordinary materials. Nano metal particles can absorb all light waves and make themselves appear black. At the same time, nano metal particles can also scatter light. Using the characteristics of nano metal particles, adding nano metal particles to black ink can produce nano black ink, which greatly improves the purity and density of black ink. In addition, semiconductor nanoparticles exhibit certain light absorption characteristics due to the significant quantum size effect and surface effect

studies show that after chemical modification on the surface of nano semiconductor particles, the medium around the particles can strongly affect their optical properties, which is manifested by red shift or blue shift in the absorption spectrum. Experiments show that the light absorption edge of CdS nanoparticles has a significant blue shift, while TiO2 nanoparticles have a large red shift. Accordingly, if they are added to yellow ink and cyan ink respectively to make nano ink, the purity of yellow ink and cyan ink can be greatly increased. Printing color prints with nano ink added with specific nano particles can enrich the layers of prints, make the tones more distinctive, and greatly enhance the expressiveness of image details, so as to obtain high-quality prints. Nowadays, with the help of high and new technology, various components in the ink (such as resin, pigment, filler, etc.) can be made into nano raw materials. In this way, due to their high fineness, they have good fluidity and lubricity, and can achieve better dispersion, suspension and stability. The amount of pigment is small, the covering power is high, the gloss is good, the resin particle size is fine, the film formation is continuous, smooth and uniform, and the film layer is thin, so that the printed image is clear. If used in UV ink, the curing speed can be accelerated, and the shrinkage and wrinkling of the ink film can be eliminated due to the uniform dispersion of the filler

in the printing ink of glass ceramics, if the composition of inorganic raw materials is nano fineness, a lot of raw materials will be saved and more exquisite high-quality images can be printed. Nanotechnology has brought a great change to the ink manufacturing industry in terms of pigments, so that the ink no longer depends on chemical pigments, but selects appropriate volume of nanoparticles to show different colors, such as TiO2, SiO2 nanoparticles are white, Cr2O3 is green, Fe2O3 is brown. Inorganic nano materials such as Al2O3 have good fluidity, which can greatly improve the wear resistance of the ink film if added to the ink. Nano carbon ink has conductivity, which has a good shielding effect on static electricity and prevents electrical signals from being interfered by external static electricity. If it is added to the ink, it can be made into conductive ink, such as high-capacity integrated circuits, modern contact panel switches, etc. In addition, if AG is made into nano scale instead of micron scale Ag in conductive ink, 50% of Ag powder can be saved. This conductive ink can be directly printed on ceramics and metals, and the ink film is thin, uniform and smooth. If Cu and Ni materials are made into 0.1 ~ 1 μ M, which can conduct electricity instead of precious metals such as palladium and silver. Therefore, the combination of nanotechnology and anti-counterfeiting technology will open up another vast world of anti-counterfeiting ink.

in addition, some nanoparticles have luminous groups that drive the main business revenue of all industries to climb, such as "one n ≡ n one" nanoparticles can emit light by themselves. The printing products printed with the ink added with this kind of nano particles can be recognized by the human eye without the irradiation of external light sources, and can also achieve a good first-line anti-counterfeiting effect for anti-counterfeiting printing; The graphic printing materials used for large-scale outdoor advertising spray painting or night reading do not need the help of external light sources, which not only saves energy, but also greatly facilitates users

in addition, because nanoparticles have good surface wettability, they adsorb on the surface of ink pigment particles, which can greatly improve the lipophilicity and wettability of ink, and ensure the stability of the whole ink dispersion system, so the printability of nano ink with nanoparticles has been greatly improved. It is believed that with the further development of nano material technology, more nano materials with different characteristics will be recognized and used by people. Applying these nano materials to ink manufacturing, special inks with different uses can be obtained, which can be used for confidential document printing, various anti-counterfeiting printing and the printing of various handicrafts, and extraordinary results can be obtained

in electrostatic copying, replacing the widely used non-magnetic toner with magnetic nano toner can eliminate the need to add ferromagnetic particles to the non-magnetic toner as a carrier, so as to make a single component copy developer, which can save raw materials and improve the copy quality. As for the source of nano materials, in fact, there are many methods to obtain nano materials, including high-temperature sintering (such as the sintering technology of carbon nanotubes), precipitation, high-temperature water dissolution, chemical vapor condensation and modern plasma energy polymerization

to sum up, the fineness and purity of ink are crucial to the quality of printed matter. To print high-quality products, we must have fine and high-purity ink as a guarantee. Therefore, it is of great significance for the printing field to deepen the understanding of nano ink and develop higher quality nano ink

nano anti-counterfeiting ink

the application of nano technology in the development and production of ink has achieved gratifying results, especially in the application of anti-counterfeiting ink. The nano anti-counterfeiting printing ink developed by combining nano technology and anti-counterfeiting technology not only has good printing effect, but also can further improve the anti-counterfeiting effect and anti-counterfeiting performance. For example, in view of the poor light resistance of fluorescent anti-counterfeiting inks and the fact that the anti-counterfeiting mechanism has been decoded and the anti-counterfeiting function has been lost, the performance of the nano anti-counterfeiting inks absorbed by near-infrared ray successfully studied by Guangzhou University has reached a satisfactory level in terms of reliability, safety, stability and aging resistance. At present, the product has been used in high-tech fields such as outer packaging, ticket anti-counterfeiting and infrared sensors

source: Chinese ink

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