Vacuum pump in food packaging machine of working principle
The principle of the vacuum food packaging machine: In brief, the packaging machine is put into the packaging bag of the packaged goods through the air extraction nozzle, and then the air is evacuated. After the vacuum degree is preset, nitrogen or other mixed gases are filled, and then the sealing process is completed. The main function of the vacuum packaging is to remove oxygen, in order to help prevent food deterioration. The principle is also relatively simple, because the food mildew and deterioration is mainly caused by the activities of microorganisms, Most microorganisms (such as mold and yeast) need oxygen to survive, and vacuum packaging uses this principle to extract the oxygen from the packaging bag and food cells, so that microorganisms lose the living environment. The experiment shows that when the oxygen concentration in the packaging bag is ≤ 1%, the growth and reproduction speed of microorganisms will drop sharply. When the oxygen concentration is ≤ 0.5%, most microorganisms will be inhibited and stop breeding. (Note: Vacuum packaging can not inhibit the growth and reproduction of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reaction, so it also needs to be combined with other auxiliary methods, such as cold storage, quick-freezing, dehydration, high-temperature sterilization, irradiation sterilization, microwave sterilization, salt pickling, etc.) In addition to inhibiting the growth and reproduction of microorganisms, vacuum deoxidization has another important function to prevent food oxidation, because fat foods contain a large amount of unsaturated fatty acids, Oxidation by the action of oxygen will make the food taste and deteriorate. In addition, oxidation will also cause the loss of vitamin A and C, and the unstable substances in the food pigment will be darkened by the action of oxygen. Therefore, deoxidization can effectively prevent food deterioration.
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