Suzhou vacuum Main products: aluminum foil bag, vacuum bag, shielding bags, board vacuum bags, food cooking vacuum bag, nylon vacuum bag, anti-static metal bags and other packaging materials. Vacuum-packed in one important aspect is oxygen, and prevent food spoilage, its principles are relatively simple, due to deterioration of food mold rot caused mainly by microbial activity, and most micro-organisms (such as molds and yeasts) survival is need oxygen, and vacuum packaging is the use of this principle, the packaging bag and oxygen deprived of food within the cell, so that microbes lost "living environment." Experimental results show: When the oxygen concentration in the packaging bag ≤1%, rate of microbial growth and reproduction of a sharp decline in oxygen concentration ≤0.5%, most micro-organisms will be inhibited and stop breeding. (Note: Vacuum packaging can not inhibit the propagation of food spoilage and discoloration caused by anaerobic bacteria and enzyme reactions, and therefore needs to be combined with other auxiliary methods, such as refrigerated, frozen, dehydrated, high-temperature sterilization, irradiation sterilization, microwave sterilization, salt pickled, etc. In addition to vacuum oxygen inhibit microbial growth and reproduction, another important function is to prevent food oxidation, because fat foods contain a lot of unsaturated fatty acids, the role of oxidation by oxygen, the food taste, deterioration addition oxide also makes vitamin A and vitamin C loss, the role of oxygen in food coloring by unstable substances, the color darker. So, oxygen can effectively prevent food spoilage and maintain its color, smell, taste and nutritional value.