Nanotechnology is expanding in the application of packaging and food machinery

Nanotechnology makes genetic engineering more controllable. People can create a wide variety of nano-biological “products” that are easily absorbed by the human body according to their own needs. Farming, forestry, animal husbandry, fishery, and fisheries may also undergo profound changes.

The emergence of nanobiology has provided a new platform for the development of food engineering. Nanotechnology makes genetic engineering more controllable. People can create a variety of nano-biological “products” that can be easily absorbed by the human body according to their own needs. Farming, forestry, animal husbandry, deputy and fisheries industries may also undergo profound changes. The food structure will also change with it. The use of nano-bioengineering and chemical engineering to synthesize "food" will greatly enrich the quantity and variety of food. Appropriate packaging and food machinery will also come into being.

Because nano-ceramics have good wear resistance, high strength and strong toughness, they can be used to make seal rings, bearings, etc. for tools, packaging, and food machinery to improve their wear resistance and corrosion resistance. It can also be used to make surface coatings for key parts of conveyors and boiling dryers.

Tokyo, Japan, has successfully developed self-cleaning glass and self-cleaning tiles in the laboratory. The surface has a thin layer of nanometer TiO2. Under the irradiation of light, any substances that adhere to the surface, including oil and bacteria, make these hydrocarbons further oxidized into gas or easily rubbed due to the catalytic action of nano-TiO2. Lost substance. TiO2 can be used to make packaging containers, food machinery cabinets and production workshops.

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

Nano SiC and Si3N4 have strong absorption of infrared rays over a wide range of wavelengths. They can be used as infrared absorbing and wave-transmitting materials to make functional films or fibers. The nano-Si3N4 amorphous block has a selective absorption from yellow light to near-infrared light, and can also be used for special window materials. The transmission loss of optical fibers with nano-SiO2 wavelengths over 600 nm is less than 10 dB/km, nano-SiO2 and nanometer The micron-thick multilayer interference film made of TiO2 has good light transmission and strong infrared reflection ability, and can save 15% of the electric energy compared with the traditional halogen lamp.

Studies have shown that 30 to 40 nm TiO2 is dispersed in a resin to form a thin film, which becomes an ultraviolet absorbing material capable of strongly absorbing light below 400 nm, and can be used as an optimal raw material for food sterilizing bags and fresh-keeping bags.

Nano-SiO2 photocatalytic degradation of organic matter water treatment technology without secondary pollution, in addition to a high degree of cleanliness, its advantages are: 1. Has a large specific surface area, can maximize the adsorption of organic matter on the surface; 2. Has a stronger ultraviolet light Absorption capacity, which has a stronger photocatalytic degradation capability, can quickly decompose the organic matter adsorbed on the surface. This provided strong technical support for food companies with large sewage treatment capacity.

Mesoporous solids and mesoporous complexes are attractive research subjects in the field of nanomaterials in recent years. Due to the high porosity of these materials (pore size of 2 to 50 nm) and high specific surface area, they are Filtration and catalysis have good application prospects. It also provides a broad space for the development of membrane filtration and sterilization equipment such as purified water and soft drinks.

The poor working environment of food machinery has a high requirement for lubricants, and lubricants are often easy to wear and easily pollute the environment. The size of the magnetic particles in the magnetic fluid is only 10nm, so it will not damage the bearing, and the base fluid can also use lubricating oil. As long as a suitable magnetic field is used, the magnetic lubricating oil can be confined at the desired position to ensure the normal operation of the machine.

Nano magnetic refrigerants. The development trend of magnetic refrigeration is from low temperature to high temperature, constituting magnetic nanoclusters. When the temperature is greater than 15 K, the magnetic entropy change is higher than that of GGG (Gd3Ga5012) and becomes the best magnetic induction in the temperature range of 15 to 30 K. Cold work. In 1997, the United States developed a magnetic refrigeration system in which Cd was a magnetic refrigerant by utilizing the magnetic refrigeration system of magnetic resonance entropy change. Compared with the common compressed gas cooling method, it has the advantages of high efficiency, low power consumption, low noise, small size, and no pollution. This opened up new avenues for food freezing and refrigeration equipment.

Rubber and plastic are raw materials for packaging and food machinery applications. However, rubber is usually added by adding carbon black to increase its strength, abrasion resistance, and aging resistance. The product is black and is not suitable for use in food machinery. The advent of nanomaterials has solved this problem. The new nano-modified rubber has a significant increase in various indicators, especially the anti-aging performance increased by 3 times, the service life of up to 30 years, and colorful, excellent color retention effect.

Ordinary plastics have large output, wide application, and low price, but their performance is inferior to that of engineering plastics. Although engineering plastics have superior performance, its high price limits its wide application in packaging and food machinery. The use of nano-materials for the modification of ordinary plastic polypropylene, to achieve the performance index of engineering plastic nylon-6, and the process performance is good, low cost, can be used in large quantities.

Reprinted from: China Packaging News