Application status of nano packaging and printing

2022-08-13
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The so-called "nano green packaging" refers to the application of nano technology and nano composite (packaging) materials, so that the packaging has super functions or strange characteristics. The so-called nano packaging materials are nano composite packaging materials with nano structural units made of particles or crystals with dispersed phase size of 1nm ~ 100nm compounded or added with other packaging materials. Nanostructures may become the basis for technological improvement. Once the critical size of materials can be controlled, the characteristics of new materials and the functions of devices can be strengthened, even beyond what we think possible

because the nano grains are smaller than the grains of conventional materials, the number of atoms on the grain boundary is more than the number of atoms inside the grains, forming high concentration grain boundaries, which endows nano materials with many different properties of conventional materials, such as high strength, high hardness, high resistivity, low thermal conductivity, low elastic modulus, low density, etc. these excellent properties determine its wide application prospects in the future

green packaging aims to change people's traditional concepts, make full use of the comprehensive characteristics of packaging materials, pay attention to ecological balance, and make it greatly conducive to the environment and human society with peak experimental power in the experimental process. Nano packaging uses nanotechnology to change traditional packaging materials and packaging technology, make more effective use of atoms and molecules, endow materials with high-tech characteristics, and pay attention to saving resources, which is greatly conducive to human society

development trend of nano packaging and printing

the chief scientist in the national 973 nano field said: "nano plastics will be one of the most promising nano technologies in China to realize industrialization." In the field of packaging and printing, breakthroughs have been made in nano ink, nano pigment, nano paper, nano film, poly food based nanocomposites (pnmc), nano luminescent materials, nano anti-bacterial packaging, nano adhesive, nano anti-counterfeiting printing, nano military protective packaging, nano green packaging, nano lithography printing technology, nano magnetic printing, and some have been preliminarily industrialized, The evaluation means of nano materials and nanostructures are basically complete, reaching the international advanced level in the late 1990s

at present, the modification of nano packaging and printing materials in China is closer to the application trend. Find the combination of the application of nano technology and the practical technology system, so that it can be popularized and applied as soon as possible. The following examples illustrate the development of nano ink, nano pigment, nano paper, nano film and so on

nano ink

nano ink is basically in the pilot stage in China, and there is still a long way to go before it is widely used in ink manufacturing and printing industry. However, some experts predict that nano ink will open up a broad Xintiandi for the ink manufacturing industry and bring a new revolution to the world's ink and printing technology

nano ink can also be used for luminous graphic printing. Some nanoparticles have their own light-emitting groups and can emit light by themselves. The printed matter printed with the ink with such particles does not need the irradiation of external light sources, and can be recognized by the human eye by its own light. If this kind of ink is used for outdoor large-scale advertising spray painting or graphic printing for night reading, it will no longer need external light sources, which can not only save energy, but also greatly facilitate users

nano UV varnish

the technology of surface gloss treatment of paper packaging products is gradually developing towards UV curing UV glazing. Nano UV varnish enables color corrugated boxes to have friction resistance, scratch resistance, moisture resistance, high gloss and other properties. Nano UV varnish is mainly composed of nano oligomers (such as epoxy acrylic acid), active diluents, photoinitiators and other additives. There are many ways of UV glazing, which can be done by glazing machine and printing machine, roller coating and printing

it can be predicted that when the continuously improved nano high-tech is widely used in corrugated box printing, the corrugated box printing will have higher resolution and better effect in the future. The manufacture of corrugated boxes cannot be separated from packaging and printing. In the packaging and printing industry, nanoparticles play an increasingly important role, so users choose according to their actual needs

nano pigments

nano 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. It will have an important impact on the upgrading of traditional pigments, mainly used in nano ink, nano water-based coating materials, etc. The typical needle like particle size of the material, with a long axis of 45 nm and a short axis of 6 ~ 7 nm, has good dispersion, crystallinity, weather resistance, high brightness and strong coloring power. Its successful development is of great significance to the renewal of traditional pigments in China, especially for the production of nano ink, which greatly improves the quality of ink

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

because nanoparticles have good surface wettability, they adsorb on the surface of pigment particles in the ink, which can greatly improve the lipophilicity and wettability of the ink, and ensure the stability of the whole ink dispersion system. If various components in the ink, such as resin, pigment and filler, are made into nano raw materials with the help of high-tech, better dispersion, suspension and stability can be achieved, with less pigment consumption, high hiding power, good gloss, fine resin particle size and clear printing image. If used in UV ink, it can accelerate its curing speed, and eliminate the shrinkage and wrinkling of the ink film due to the fine and uniform dispersion of the filler. In the printing ink of glass ceramics, if the inorganic raw materials are composed of nano fineness, a lot of raw materials can be saved and a more refined, beautiful and high-quality image can be printed

nano paper, fresh-keeping corrugated board, carton

at present, wood fiber can only be processed to the level of micron (100 ~ 100, and then scrape the film material to be tested to 0nm). If wood is processed to the nanometer level, the original cell structure of wood will be destroyed and the fiber tissue structure will change. Cellulose, hemicellulose and lignin can be separated mechanically in the processing process, which can greatly improve the pulping rate and reduce the environmental pollution of pulp 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 by sending professional after-sales service personnel to the user's site within 24 hours. 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. The nano science and Technology Research Institute of central China Normal University has developed a new type of super hydrophobic, self-cleaning nanostructure surface paper. This kind of nano paper is to prepare a layer of nanostructured film on the surface of ordinary paper. Its technological innovation is that the organic mother liquor is divided into micron sized islands by nano dispersion technology, and the inorganic nanoparticles are evenly dispersed in the islands, forming a superhydrophobic charge like structure. The in-situ surface modification technology of inorganic nanoparticles is adopted to promote the uniform dispersion of high-density inorganic nanoparticles. At present, this product has not been produced and sold in China or even in the world

in addition to all the application properties of ordinary paper, such as writing, copying, printing, etc., nano paper also has excellent properties such as moisture-proof, anti-aging, low water absorption, low scalability, and simple process, low cost, so it has a broad market prospect

fresh keeping corrugated paperboard

the way to keep fruits and vegetables fresh is to reduce the loss of water, inhibit biological respiration and bacterial growth, and remove the ethylene gas that promotes their aging and maturation. Fresh keeping corrugated paperboard is manually processed from these aspects. ① Composite fresh-keeping corrugated board: the aluminum coating is compounded on the inner surface of corrugated board. This composite film has the function of absorbing ethylene gas, which can not only prevent moisture evaporation, but also reflect radiation lines, which can prevent the temperature rise in the box and play a fresh-keeping role. ② Mixed fresh-keeping corrugated board: nano porous ethylene gas absorption powder can be added in the manufacturing process of corrugated box inner paper to prevent ripening; It can also be coated on the base paper to produce 6 μ m~14 μ M wavelength infrared special ceramics. This powder can emit infrared rays at room temperature, which can not only activate relevant molecules in fruits and improve the ability to resist microbial erosion, but also activate enzymes and improve the sweetness of fruits. The cartons made by this method are especially suitable for packaging peach, grape, Bayberry and other products, with excellent fresh-keeping effect

fresh-keeping corrugated cartons

antibacterial fresh-keeping corrugated cardboard and cartons

in order to keep fresh fresh, fruits and vegetables, it is very important to control the temperature, humidity, air and other environmental conditions of packaging containers. For example, keeping a moderate low temperature can inhibit the respiration of the contents. Keeping a proper temperature can reduce water evaporation and eliminate the ethylene gas naturally emitted by the contents, which can inhibit aging. Another problem encountered in the preservation of fruits and vegetables is that the pollution of pathogenic microorganisms leads to the wilting and corruption of fruits and vegetables. Therefore, what measures should be taken to inhibit the propagation of microorganisms to achieve the purpose of antibacterial preservation has become a problem that carton manufacturers have to face. The solution is to apply a layer of nano antibacterial preservative on the surface of the lining paper of the antibacterial fresh-keeping corrugated board, which has no impact on food hygiene

silica mixed lining paper corrugated board and carton

this kind of corrugated board has good fresh-keeping performance. The processing method of the board is exactly the same as that of ordinary corrugated board, and there is no need to clamp any material between the lining paper and corrugated board. It can keep fresh because the lining of cardboard contains nano powder that can absorb ethylene gas. Nano powder is a porous powder made of silica with silica as the main component. Because the adsorption capacity of silica for ethylene gas is better than that of activated carbon, rare earth zirconium and zeolite, the paper added with nano silica powder as the lining paper of corrugated board has better fresh-keeping effect

nanotechnology is the latest technology for manufacturing high-performance packaging. Its application in corrugated boxes involves almost all aspects of cartons and paperboards. In the field of corrugated box manufacturing, nanotechnology and nano materials have strong development momentum and broad market prospects

nano fresh-keeping film

the existing fresh-keeping technology and process applied in packaging are very complex, the fresh-keeping effect is poor, and the cost is relatively high in the process of packaging, production, storage and transportation. These problems will be solved by using nanotechnology

if the packaging of fresh food such as fruits and vegetables is to achieve the effect of fresh preservation, it is necessary to solve the problem of deterioration and decay of fruits and vegetables caused by ethylene. In packaging, when the ethylene released by fruits and vegetables reaches a certain concentration, fruits and vegetables will decay faster. In order to solve this problem, ethylene absorbent should be added to the fresh-keeping packaging to reduce the ethylene content in the packaging and improve the fresh-keeping effect. However, the effect of ethylene absorbent currently used is not ideal, and the application of nanotechnology can solve this problem. Nano Ag powder can catalyze the oxidation of ethylene. Adding nano Ag powder to fresh-keeping packaging materials can accelerate the oxidation of ethylene released from fruits and vegetables

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