Vacuum packaging is the packaging to protect the product from environmental pollution and extend the shelf life of food, which can improve the value and quality of the product. Vacuum packaging technology originated in the 1940s. Since the successful application of polyester, polyethylene plastic film in commodity packaging in 1950, vacuum packaging machines have developed rapidly. At present, the rate of high-efficiency vacuum packaging machines has developed from several items per minute to dozens of items. The production efficiency of thermoforming - filling - sealing machine can reach more than 500 pieces per minute.