Advanced "nano" technology is widely used in food packaging industry

Fresh-keeping packaging

To increase the freshness of fresh fruits and vegetables and extend shelf life, ethylene absorbers must be added to the packaging to reduce the ethylene content of the packaging. However, the effect of ethylene absorbents currently used is not satisfactory. Nano-sized silver powder (Ag) has a catalytic effect on ethylene oxidation, that is, nano-silver powder can be used as a catalyst for ethylene oxidation. Adding nano-silver powder to fresh-keeping packaging materials can accelerate the release of ethylene from fruits and vegetables. Ethylene content in the package, so as to achieve a good effect of preservation. Nanoparticles used as oxidation catalysts mainly include Fe4O3, Fe2O3, CO3O4, NiO, and Pt, Rh, AS, Pd, etc.

Flexible packaging

Traditional ceramic containers and glass containers have the advantages of non-toxicity, good sealing and smooth surface, which have already occupied an important position in the packaging industry. However, due to the disadvantages of fragile and inconvenient handling, it was replaced by some metal packaging. In recent years, countries such as Western Europe, the United States, and Japan have added nano-particles to ceramics or broken glass to obtain tough ceramics or glass materials. For example, the United Kingdom mixes nano-alumina with zirconium dioxide and has obtained high-toughness ceramic materials in the laboratory. As another example, Japan added aluminum oxide nanoparticles to ordinary glass, significantly changing the brittleness of the glass.

Ink Innovation

As early as 1994, XMX Corporation of Massachusetts, USA applied for and obtained a patent for the production of printing inks, uniform particle nanoparticles. The company is preparing to design and manufacture a commercial production system that will no longer rely on chemical pigments. Instead, it will select suitable nanoparticles to obtain various color particles for the production of advanced printing inks.

Anti-counterfeit packaging

The general metal particles are black and have the characteristics of absorbing infrared rays, and have a large surface area, a high surface activity, and are sensitive to the surrounding environment (temperature, light, humidity, etc.), when the nanoparticles having these characteristics are added to packaging materials, or made into a coating After the varnish is applied to the surface of the packaging material, people can use the temperature, light, or humidity to identify the product when selecting the product, so as to achieve the purpose of anti-counterfeiting. In other words, the use of nanotechnology can achieve color anti-counterfeiting, physical and chemical effects of anti-counterfeiting and other purposes.

Anti-static packaging

The packaging materials and packaging containers are prone to static electricity due to friction during transport. Metal nanoparticles have special functions for eliminating static electricity. Therefore, when packaging materials are manufactured, as long as a small amount of metal nanoparticles is added, friction can be eliminated. Static electricity. At the same time, at the time of printing, because the surface has no electrostatic adsorption phenomenon, better printing effect can be obtained at a higher printing speed. For example, the nano-type polymer polymer conductive packaging material not only greatly enhances the electrical conductivity, but also has a variety of appearance colors, and other physical and chemical properties are also greatly enhanced.