Vacuum packaging machine is the packaging bags and food cells within the oxygen removed, so that the survival of microorganisms to survive the environment.

The main function of the vacuum packaging machine is to remove oxygen, in order to help prevent food deterioration, the principle is relatively simple, due to food mold rot deterioration caused by microbial activities, and most micro-organisms (such as mold and yeast) survival is needed Oxygen, and vacuum packaging is the use of this principle, experiments show that: when the oxygen concentration within the bag ≤ 1%, the microbial growth and reproduction rate dropped sharply (Note: vacuum packaging can not inhibit the growth of anaerobic bacteria and Reaction caused by food deterioration and discoloration, and therefore need to be combined with other auxiliary methods, such as refrigeration, quick freezing, dehydration, high temperature sterilization, irradiation sterilization, microwave sterilization, salt, etc.)

Da Baoji varieties, types, specifications a lot, generally can be classified according to the following ways:

(1) by the way of classification

① welding type strapping machine. Because the plastic belt is easy to heat and melt, it is more suitable for plastic with joints. According to the different heating methods, but also divided into electric welding, ultrasonic welding, high-frequency welding, pulse welding and so on.

② buckle type strapping machine.It uses a special buckle joints, the strap joints clamped firmly, used for steel.

(2) Sort by bundles

① plastic strapping machine. It is used for medium and small weight crates of the strapping machine. The plastic belt used is mainly polypropylene belt, there are nylon belt, polyester belt and so on.

② steel strapping machine. It is used as a strapping material, because the strip strength is high, mainly for heavy, large crates.