Main products: aluminum foil bag, vacuum bag, shielding bags, aluminum bags, board vacuum bags, cooking food vacuum bag, nylon vacuum bag, anti-static bags and other packaging materials, metal. Vacuum-packed in one important aspect is the oxygen, and prevent food spoilage, the principle is relatively simple, mainly due to deterioration of food mold rot caused by microbial activity, while the majority of microorganisms (such as molds and yeasts) survival is need oxygen, and vacuum packaging is the use of this principle, the packaging bag and food cells deprived of oxygen, microorganisms lose "survival of the environment." Experimental results show: When the oxygen concentration packaging bags ≤1%, rate of growth and reproduction of microorganisms on a sharp decline in oxygen concentration ≤0.5%, most microorganisms will be inhibited and stop breeding. (Note: The 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 complementary methods, such as refrigerated, frozen, dehydrated, high-temperature sterilization, irradiation sterilization, microwave sterilization, salt marinated, etc. In addition to vacuum oxygen inhibit microbial growth and reproduction, another important function is to prevent food oxidation, because fats and oils in foods rich in unsaturated fatty acids, the role of oxygen by oxidation, the food taste, bad. Also oxidation also make vitamin A and vitamin C losses, the role of oxygen in food coloring by unstable substances, the color darkens, so oxygen can effectively prevent food spoilage, keep its color, smell, taste and nutritional value.