Application of the hottest nano coating technology

Application of nano coating technology in the printing field

Application of nano coating technology in the printing field

April 15, 2004

1. Papermaking coating

traditional paper uses coarse fibers such as trees, bamboo and hemp, while the particles of coating and filler are large, which makes ordinary paper afraid of water and moisture. Offset printing paper and electrostatic copy paper have waterproof and moisture-proof functions, but it is inconvenient to write. Nanotechnology is more and more widely used in the paper industry. At present, wood fiber can only be processed to the level of micron (nm), because the cell diameter of wood is relatively coarse. Wood nanotechnology can change the structure of wood cells and control the growth of cells, which may change the characteristics of surgical wood. If the wood is processed to nanometer level, the wood should be replaced; If the power plug is not in contact with good materials, the original cell structure will be destroyed, and the fiber tissue structure will change. Cellulose, hemicellulose and lignin can be separated by mechanical methods in the processing process. This can greatly improve the rate of paddle making and reduce the environmental pollution of paddle making and paper industry

in papermaking coatings, the application of nano calcium carbonate in the coating of white paperboard can effectively improve the performance of white paperboard. The addition of nano calcium carbonate is conducive to the improvement of several important performance indicators of the coating, such as IGT value, k&n ink absorption, smoothness and so on

at present, the use of nanotechnology in the paper industry has begun to enter practical production. For example, Henan Yinge company and the Nanotechnology Research Institute of central China Normal University have successfully developed waterproof nano paper by using the most advanced nano technology in the world to prepare nanostructured layers on ordinary paper. In addition to maintaining the original writing and copying functions of the paper, it also has the super hydrophobicity that ordinary paper does not have and the special properties of preventing moisture of non-ferrous metals and special metals such as aluminum alloy, improving the strength of the printing surface and reducing the expansion rate in order to reduce the weight

2. Nano ink

ink fineness is closely related to print quality. The better the fineness of the ink, the stronger the coloring power. The dots of the printed matter are clearer, fuller and more powerful. The nano transparent iron oxide series Yanke, which has recently been rated as a national key new product by the Ministry of science and technology, has been successfully developed. Nano metal particles can absorb all light waves and make themselves black. At the same time, they can also scatter light. Adding nano metal particles to black ink can improve the purity and density of black ink. After the surface of semiconductor nano puller is chemically modified, the medium around the particle can strongly affect its optical properties. It shows that the absorption spectrum has red shift or blue shift. If they are added to yellow and cyan inks to make nano inks, the purity of yellow ink and cyan ink can be increased, and the toothbrush layers that meet the requirements of gb19342 (2) 003 standard can be enriched. Nowadays, with the help of high and new technology, various components in ink (such as resin, pigment, filler, etc.) can be made into nano raw materials. Because they are highly fine, they have good fluidity and lubricity, which can achieve the effect of low pigment consumption but high coverage. If used in UV ink, it can accelerate the curing speed and eliminate the shrinkage and wrinkling of the ink film. Nano carbon ink is conductive and has a good shielding effect on static electricity. If ink is added, it can be made into conductive ink. If AG is made into nano scale in conductive ink instead of micron scale A8, 50% of Ag powder can be saved. This kind of ink can be directly printed on ceramics and metals, and the ink film is thin, uniform and smooth; If Cu and NJ materials are made into 0.1 ~ 1 μ M, which can replace precious metals such as palladium and silver to conduct electricity. The combination of nano and anti-counterfeiting technology will open up another broad world of anti-counterfeiting ink

some nano particles can emit light by themselves, such as [-n ≡ n -] nanoparticles, which can emit light by themselves in the dark for more than hours after a few minutes of illumination. Their luminous intensity and maintenance time are more than 30 times that of traditional fluorescent materials. Moreover, the material itself is non-toxic and harmless, does not contain any radioactive elements, and because nanoparticles have good surface wettability. They are adsorbed on the surface of pigment particles of ink, which can greatly improve the lipophilicity and wettability of ink

3. Nano ceramic roller

the so-called nano ceramics refers to ceramic materials with nano scale phase in the microstructure, which greatly improves the strength, toughness and Superplasticity of materials. As we know, laser engraved ceramic roller is widely used in flexographic printing, and it is considered to be the key to improve the quality of flexographic printing. Narrow width flexographic printing machines and UV ink flexographic printing machines have almost all adopted ceramic rollers. In terms of the development of flexo printing, ceramic rollers will eventually be eliminated from metal rollers. Calm, a famous British material expert, pointed out that nano ceramics is a strategic way to solve the brittleness of ceramics. For the same roller used in flexographic printing, when processing the roller with plasma thermal spraying process, it is required to spray a high-quality ceramic coating on the surface of the substrate, and the hardness range of the coating must be HV30. "Igor slowing, a scientist at the important materials research institute, said that the general porosity must be less than 1%, for the roller higher than 1200 lines; Its porosity must be less than 0.5%, and the coating structure should be uniform, high hardness, high density, etc. while the nano properties in nano ceramics improve the hardness, toughness and wear resistance of ceramics, which lays the foundation for an excellent engraving roller

in short, as a high-tech with rapid research and development in recent years, the application of nano technology in the printing field will continue to develop in depth and breadth like other fields