The use of compound modified atmosphere packaging equipment for fresh food packaging of food and vegetables requires a reasonable requirement for gas mixing precision error and gas replacement rate. The gas used for the modified atmosphere packaging of fish is composed of CO2, O2, and N2, in which the concentration of CO2 gas is higher than 50%, which inhibits the growth of aerobic bacteria and mold and does not exude the fish meat; O2 concentration is 10%-15% inhibition Oxygen bacteria multiply. If you improve the rate of indoor air flow, it helps to speed up the cooling rate. Suitable for all garden products. Designed for different needs of life, equipped with reusable technology ice packs, ice packs can be cold to keep warm (cold bags can be frozen to -190 °C, the maximum can be heated to 200 °C, can be arbitrary cutting size) packaging, pre- Cold and cold production areas; sales area including cold storage, wholesale distribution (again, grading, renovation and packaging), retail and consumer, etc.; production and marketing links mainly refers to the short-distance and long-distance transport of clean dishes. The N2 purity used in food packaging must reach a pure nitrogen level (ie, safety level). Air precooling should be considered. c) Demand The longer the transport or storage of the garden products, the more precooling is required. Conversely, there is no need for pre-cooling if it is only sold to nearby markets. Quick cooling of vegetables after harvest has a lot of benefits, not easy to change color, smooth surface, easy to clean, good insulation effect, not afraid to touch, can be used for life. Products used with ice packs, cold insulation effect exceeds the United States industry standards. Continuous cold storage time can reach several days.

The United States applied N2 to increase the strength of beverage cans made of thin aluminum. Nitrogen was dissolved in beverages before beverage canning. The use of 40% CO2 and 60% N2 gas in the air-filled packaging bags resulted in a longer shelf life than control samples. 22 days is 6.5 times the shelf life of the control sample.