The hottest nanotechnology makes the packaging wor

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Nanotechnology brings a new look to the packaging world (4)

two application technologies of nano packaging materials

nano coating technology

high barrier is one of the basic functional elements of plastic packaging. Pet is the preferred material for beverage packaging. It has many advantages, such as good transparency, stable chemical properties, relatively good barrier, light weight, low price and recyclability, so it is widely used. However, as a beer bottle, the gas barrier of pet is still not high enough. Therefore, improving the gas barrier property of polyester bottles is the primary technical problem to be solved in realizing the plasticization of beer packaging. Organize and implement the special project of major short board equipment. Among many technologies, surface coating technology is the new technology with the earliest research, the widest application and the most investment. Now it has become the main means to improve the gas barrier of polyester bottles. In the surface coating technology, nano surface coating method is one of the effective methods

among various surface technology coating methods, plasma nano coating technology has the most market potential, which is also a hot spot of modern development. The research of plasma nano surface treatment began in the late 20th century. It is a vacuum dry treatment process, which has the advantages of simple operation, cleaning, high efficiency, safety and pollution-free, and can meet the requirements of environmental protection. The coating thickness of plasma surface treatment is nanometer, which can significantly improve the physical properties of the material interface and ensure that the material matrix will not be adversely affected

the amorphous nano carbon coating technology (ACTIS) developed by the French side company is to condense and deposit plasma acetylene on the inner wall of PET bottles to form a highly hydrogenated amorphous carbon uniform nano solid film with a thickness of 20~150nm. The effect of oxygen isolation of PET bottles treated by ACTIS process is 30 times higher than that of ordinary PET bottles, and the permeability of PET bottles to the areas covered by the operation of CO plastic granulator is increased by more than 7 times, and the permeability of acetaldehyde is increased by 6 times. Diamond type nano carbon coating process (DLC) uses high-frequency vacuum discharge to form a fine coating of 20~40nm thick, diamond like carbon structure on the inner surface of PET bottles with ionic carbon and hydrogen. The oxygen resistance of this pet bottle is more than 20 times higher than that of ordinary PET bottles, the CO2 resistance is 7 times higher, the water vapor resistance is 8 times higher, and the UV resistance is also greatly improved

silicon oxide nano treatment pet bottle technology uses SiO2 as vacuum physical vapor deposition treatment in the state of high vacuum plasma, and the treatment layer is outside the PET bottle. The processing cost of this method is more economical than using PET bottles or multi-layer bottles

DuPont polyester (Du Pont) developed a new two-stage external coating technology, which can improve the impermeability of PET bottles to O2 and CO2 by 30 times. The undercoat can be separated by water, and the material recovery is very convenient. It is an excellent green packaging

nano additive technology

with the rapid development of packaging, the increasing demand for special functions of packaging, such as explosion-proof, anti electromagnetic, camouflage, high barrier, anti ultraviolet packaging and other requirements, has promoted the development of nano packaging technology. Nano packaging material compounded by nano technology is a kind of high-tech material. If 10% nano tlmc (thermotropic liquid crystal polymer) is added to the polymer, the tensile strength of the material will be increased to 450MPa, which will greatly expand its use and save scarce resources

in May, 2004, the UK foraday company announced that in order to cooperate with the environment, they will use nanotechnology in the ultra-thin layer of polymer molecules. In the future, this product will provide new functions for packaging materials. This research is closely related to physics and chemistry. Chemists have found a way to make the polymer layer only one molecule thick, while physicists generally have the following commonalities with the water of a single molecule: Ping studies the properties of each layer. These achievements will enable individual molecules to react according to the environment and protect products according to changes in temperature and humidity

and applied for a national invention patent. Nano fresh-keeping packaging materials can improve the fresh-keeping effect of fresh fruits and vegetables and extend the shelf life. Adding nano silver powder to fresh-keeping packaging materials can accelerate the oxidation of ethylene released from fruits and vegetables, reduce the ethylene content in packaging, and achieve good fresh-keeping effect. The application of nanotechnology in anti ultraviolet materials, such as adding nano anti ultraviolet powder into anti ultraviolet packaging materials, makes the anti ultraviolet packaging bag made of it achieve better anti ultraviolet effect

metal nanoparticles have the special function of eliminating static electricity. As long as a small amount of metal nanoparticles are added in the production of packaging materials, static electricity can be eliminated, so that the packaging surface will no longer absorb dust, reducing the scratch caused by friction. At the same time, when printing, because there is no electrostatic adsorption on the surface, it will help to improve the printing speed and improve the printing effect

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