The inert bacteriostatic gas such as nitrogen produced by the nitrogen generator is used to inhibit the growth and reproduction of bacteria, thereby delaying the metabolic process of the storage cells, so as to achieve the technology of maintaining freshness. Mostly used in alcohol, grease; Extruded, fried; Pastry, baking; Milk powder; Fruits and vegetables, nuts; Candy and other food transportation and preservation.Nitrogen used for food processing and packaging purposes must strictly comply with industry regulations ranging from 99% to 99.9%, depending on the nature of the packaging or storage system involved.