With the improvement of people's living standards, the requirements for food are becoming more and more strict, and the packaging of food is constantly updated and improved. It not only protects food but also facilitates storage and transportation. The food packaging materials currently on the market are roughly classified into: metal can packaging, glass packaging, paper container packaging, plastic packaging, etc., and plastic packaging is developing rapidly.

At present, the booming nanotechnology has attracted the attention of more and more researchers in the field of packaging materials. Nanomaterials have excellent antibacterial and barrier properties due to their unique surface effects and size effects, so they can meet the special requirements of food packaging for packaging materials. Therefore, the development of this technology has become a new opportunity for the food packaging industry.

Due to its good wear resistance, high strength and high toughness, nanomaterials can be used in the manufacture of sealing rings, bearings and the like for cutting tools, packaging and food machinery to improve their wear resistance and corrosion resistance. It can also be used to make surface coatings for conveying machinery and key components of boiling drying beds.

In Germany, a special non-polluting wear-resistant transparent coating made of nano-silicon-based ceramics is applied to objects such as glass and plastic, and has functions such as anti-fouling, dust-proof, scratch-resistant, wear-resistant and fireproof. A surface coating that can be used in packaging and food machinery parts that are in direct contact with food.

Self-cleaning glass and self-cleaning ceramic tiles have been successfully developed in the laboratory in Tokyo, Japan. The surface has a thin layer of nano-TiO2. Under the illumination of light, any substances that are contaminated on the surface, including oil stains and bacteria, can further oxidize these hydrocarbons into gas or be easily rubbed due to the catalytic action of nano-TiO2. Material that is lost. TiO2 can be used to make packaging containers, food machinery cabinets, and production workshops.

Nano-SiC and Si3N4 have strong absorption of infrared light in a wide wavelength range, and can be used as infrared absorbing and wave-transparent materials to form functional films or fibers. Nano-Si3N4 amorphous blocks have yellow to near-infrared The selective absorption of light can also be used for special window materials. The transmission loss of light made of nano-SiO2 to light with wavelengths above 600 nm is less than 10 dB/km, and the micro-layer thick multilayer interference film made of nano-SiO2 and nano-TiO2 It has good light transmission and strong infrared reflection ability, which can save 15% of electric energy compared with traditional halogen lamps. These properties can be used in infrared drying and infrared sterilization equipment for food machinery.

It has been proved that the TiO2 of 30-40 nm is dispersed into the resin to form a film, which becomes an ultraviolet absorbing material which has strong absorption ability to light below 400 nm wavelength, and can be used as the best raw material for food sterilization bags and fresh-keeping bags.

These examples and so on all show that nanotechnology has been slowly discovered and applied, and is becoming more and more mature. It is hoped that under the continuous research efforts of researchers, nanotechnology can better serve human beings.