The role of the hottest nanotechnology in the fiel

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The role of nano science and technology in the field of printing and packaging

nano science and technology is a high-tech that was born and rose rapidly in the late 1980s. Its basic meaning is to understand and transform nature within the nano size (i.e. 0.1~100nm), and create new substances through direct operation and arrangement of atomic and molecular motion laws and characteristics. This means that people can produce very pure materials and a variety of new products. Application of nanotechnology in printing 1 Nano ink ink fineness is closely related to print quality. The better the ink fineness, the stronger the coloring power, and the clearer and fuller the dots of the printed matter. Nano scale transparent iron oxide series pigments, which have recently been rated as national key new products by the Ministry of science and technology, have been successfully developed in China. 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. On the other hand, after the surface of semiconductor nanoparticles is chemically modified, the media around the Shanghai printed particles can strongly affect their optical properties, which shows that the absorption spectrum is red shifted or blue shifted. If they are added into yellow ink and cyan ink respectively to make nano ink, the purity of yellow ink and cyan ink can be increased, and the printing level can be enriched. 1. Impact energy should be accurate. Nowadays, with the help of high-tech, various components in the 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 query experimental data 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 instead of micron scale Ag in conductive ink, 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 Ni materials are made into 0.1~1 m ultrafine particles, they 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 powder particles can emit light by themselves, such as "- n -" nano particles. After a few minutes of illumination, they can emit light by themselves in the dark for more than 12~24 hours. Their luminous intensity and maintenance time are more than 30 times that of traditional fluorescent materials. The materials themselves are non-toxic, harmless and do not contain any radioactive elements. Because nano particles have good surface wettability, they adsorb on the surface of pigment particles of ink, which can greatly improve the lipophilicity and wettability of ink. 2. nano ceramic roller the so-called nano ceramic refers to the ceramic material with nano scale phase in the microstructure, which greatly improves the strength, toughness and Superplasticity of the material. As we know, laser engraved ceramic roller is widely used in flexographic printing. It is considered to be the key to improve the quality of flexographic printing. Narrow width flexographic press and UV ink flexographic press have almost all adopted ceramic roller. From the development of flexo printing, the ceramic roller will eventually eliminate the metal roller. Cahn, a famous British material expert, pointed out that nano ceramics are a strategic way to solve the brittleness of ceramics. For the embossed roller used for flexographic printing, when the embossed roller is processed by plasma thermal spraying process, it is required to spray high-quality ceramic coating on the surface of the substrate. The coating hardness range must be hv300~1300, and the general porosity must be less than 1%. For the embossed roller higher than 1200, the porosity must be less than 0.5%, and the coating structure should be uniform, high hardness, high density, etc. the nano characteristics of nano ceramics improve the hardness, toughness and wear resistance of ceramics, This will lay the foundation for the 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. 3. the fibers such as trees, bamboo and hemp used in the traditional nano paper are relatively thick, while the particles of coating and filler are relatively large, which makes the ordinary paper afraid of water and moisture. Although offset printing paper and electrostatic copying paper have waterproof and moisture-proof functions, they are inconvenient to write. Nanotechnology is more and more widely used in the paper industry. At present, the wood fiber of Shanghai printing company can only be processed to the level of micron (100~1000nm). Because the cell diameter of wood is relatively large, the wood cell structure can be changed and the cell growth can be controlled through wood nanotechnology, which may change the characteristics of wood. When the wood is processed to the nanometer level, the original cell structure of the wood will be destroyed, and the fiber tissue structure will change. Cellulose, hemicellulose and lignin can be separated by mechanical methods in the processing process, which can greatly improve the rate of paddle making and reduce the environmental pollution caused by the paddle making and papermaking industry. In papermaking coatings, the application of nano calcium carbonate in the coating of white paperboard can expand the production capacity and improve the performance of white paperboard. The addition of nano calcium carbonate is beneficial to the improvement of several important performance indexes of the coating, such as IGT value, k n ink absorption, smoothness, etc. 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 nanotechnology in the world to prepare nano structure layer on ordinary paper. In addition to maintaining the original writing and copying functions of the paper, why not Yes, it also has the special properties of super hydrophobicity and moisture resistance, improving the printing surface strength and reducing the expansion rate that ordinary paper does not have

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