As a vacuum packaging machine supplier, Dajiang Machinery specialized in vacuum wrapping machine. The vacuum packaging machine can automatically extract the air in the packaging bag, and complete the sealing process after reaching a predetermined vacuum level. It can also be refilled with nitrogen or other gas mixtures, and then the sealing process is completed. Commercial vacuum packaging machines are often used in the food industry, because after vacuum packaging, food can resist oxidation, so as to achieve the purpose of long-term preservation.