Gas control packaging machine is a new type of foodpreservation technology, using protective mixed gas (usuallycO、N、O) Replace the air in the package, use the differentroles played by various protective gases, inhibit the growthand reproduction of most microorganisms that cause fooddeterioration, and reduce the breathing rate of active food(fruits and vegetables and other plant foods), so as to keepthe food fresh and extend the preservation period. The foodpackaged in gas control can better maintain the original color,aroma, taste, shape and nutrition of the food.