Vacuum packing will air in food bags, the air inside out bags to the expected after the vacuum degree, then filled with nitrogen or other gas mixture, then complete sealing processes. Vacuum packaging is the main purpose of oxygen to help to prevent the food metamorphism, its principle is simple, because food rotting mainly by the action of microorganisms metamorphic cause, and most microorganisms (such as mould and yeast) survival is need oxygen, and vacuum packaging is the use of the theory, the packing bag of the cell in food and oxygen removed, make the microbial lose their environment.
The vacuum is mainly food in a vacuum fresh atmosphere, little oxygen, food not easy to rot, plastic packaging and use may be exempted from in the insect damage. Compared with conventional insurance, food preservation degree and the shelf life and high, still can be vacuum inflatable packaging, this packing means for the fragile, brittle food special advantage, filling the gases in the packaging container into not only can restrain the growth of mould, and at the same time to play outside of extrusion buffer action.