1. Vacuum packaging bags - Wangwenshengyi, is to put some food which needs to be kept fresh into the bags, pack it well and then draw out the air inside, forming an internal vacuum, blocking the entry of the outside air, the air is not circulating, so as to achieve the effect of preservation. Vacuum packaging bags also have their own classification, the most common are aluminum foil packaging bags, glassware packaging and so on.
Secondly, the advantages of vacuum bags are as follows:
1. Easy to use. Vacuum packaging bags can be opened conveniently and safely. When eating, the food in the bag can be opened for eating, even without heating.
2. Convenient storage and transportation. Vacuum packaging bags have the advantages of light raw materials, superposition, small space occupation and saving storage and transportation costs.
3. Saving energy. Vacuum bags, because of their lighter weight, are packaged through sterilization, which consumes 30-40% less energy than tin cans.