Uses：
1. Isolate oxygen to prevent food ingredients from oxidizing and deteriorating;
2. Prefabricate some microbial growth;
3. Increase the strength of the packaging, and the product is not easily damaged by squeezing.
Air is mainly composed of nitrogen and oxygen, of which nitrogen accounts for 78.08% and oxygen accounts for 21%. After the nitrogen in the air is extracted, it can become liquid nitrogen through high pressure or low temperature.
Nitrogen can be divided into pure nitrogen, food grade nitrogen and industrial grade nitrogen according to its purity. The purity of pure nitrogen can generally be as high as 99.99%; the purity of food grade nitrogen is above 99.9%; the purity of industrial grade nitrogen is above 99.2%
Technical parameters:
| Container specifications | Container size (cm) | Average weight (kg) | Valve/thread outlet | Filling volume | |
| 40L nitrogen cylinder | 22×140 | 56 | QF-2 thread G5/8 | 13.5MPa/5.4Nm3/6kg | |
| QF-2 thread G5/8 | 51×160 | 280 | QF-2 thread G5/8 | 120kg | |
| 20~100m3 liquid nitrogen storage tank | 260×800 and above | 3200 and above | According to customer requirements | 20~100 tons | |
| Technical parameters | ||||
| Name | Indicator | Food nitrogen | High purity nitrogen | Unit |
| Nitrogen | ≥ | 99.90% | 99.999% | %V |
| Hydrogen | ≤ | 15 | 1 | ppmv |
| Oxygen | ≤ | 50 | 3 | ppmv |
| Carbon monoxide | ≤ | 5 | 1 | ppmv |
| Carbon dioxide | ≤ | 10 | 1 | ppmv |
| Total carbon | ≤ | 5 | 1 | ppmv |
| Water | ≤ | 15 | 3 | ppmv |
