The vacuum packaging bag is composed of several plastic films with different functions. Each layer of film plays a different role.
The products are divided into transparent bags and aluminum foil bags. The composite material of the vacuum bag is a composite of PE and nylon. Nylon has good barrier properties, can block moisture and gas, and can maintain a vacuum state for a long time. The surface of ordinary plastic bags There are pores and cannot be vacuumed. Even if the packaging is reluctantly packed, it will leak after a long time, and it may leak right after the packaging.
If you want to maintain the freshness of food for a long time, you can't do it by vacuuming, because when the oxygen concentration in the bag is ≤1%, the growth and reproduction speed of microorganisms will drop sharply. When the oxygen concentration is ≤0.5%, Most microorganisms will be controlled and stop reproducing, and vacuum bags cannot control the proliferation of anaerobic bacteria and the deterioration and discoloration of food caused by enzyme reactions, so it needs to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, Irradiation sterilization, microwave sterilization, salting, etc.
