Vacuum bags gusset bag are also called pressure-reduced packaging, which is based on the principle of atmospheric pressure. The main function of vacuum bags is to remove oxygen to help prevent food from rotten and spoiled. Vacuum packaging is a process in which the oxygen in the packaging bag and food cells is pumped out with an air extractor, so that the microorganisms lose their "living environment".
The vacuum bag can also prevent the oxidation of food, make the food tasteless, deteriorate and reduce the loss of vitamin A and C.Three-sealing packaging bags made of double-layer composite film or three-layer aluminum thin composite film are commonly used for vacuum packaging materials. Two types of vacuum packaging machines are commonly used: cavity type and external pumping type. my country's vacuum packaging technology was developed in the early 1980s, and vacuum inflatable packaging technology began to be used in the early 1990s.
Vacuum inflatable packaging is to fill in nitrogen, carbon dioxide and other gases after the vacuum is drawn. Nitrogen is an inert gas, which plays a filling role and keeps the vacuum bag at a positive pressure to prevent the air outside the bag from entering the bag and protect the food. Carbon dioxide has the activity of inhibiting microorganisms such as molds and spoilage bacteria. Some foods such as crispy and fragile foods, foods that are easily deformed and oily, have sharp edges and corners or have high hardness that will pierce the vacuum bag.
After vacuum inflation packaging, the inflation pressure in the vacuum bag is stronger than the atmospheric pressure outside the packaging bag, which can effectively Prevent food from being crushed and deformed under pressure without affecting the appearance of the packaging bag and printing decoration. With the promotion of vacuum bag small packaging and the development of supermarkets, its scope of application will become wider and wider, and some will gradually replace rigid packaging.