Vacuum bags are divided into transparent vacuum bags and aluminum foil vacuum bags. The composite material of vacuum packaging bags is a composite of PE and nylon. Nylon has good barrier properties, can effectively block moisture and gas, and can maintain a vacuum state for a long time. Plastic bags are just ordinary plastics. Such plastic bags have pores on the surface and cannot be vacuum-packed. Even if they are barely packed, they will leak after a long period of time, or even if they are just packed.
If you don’t need a vacuum bag, if you want to maintain the freshness of food for a long time, it cannot be achieved by vacuuming, because when the oxygen concentration in the packaging bag is ≤1%, the growth and reproduction speed of microorganisms will drop sharply, and when the oxygen concentration is ≤0.5%, Most microorganisms will be inhibited and stop reproducing, and vacuum packaging cannot inhibit the reproduction of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reactions. Therefore, it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, and high temperature cleaning. Bacteria, irradiated bacteria, microwave bacteria, salting, etc.
