The main function of the vacuum bag is to remove oxygen to help prevent food from deteriorating.most microorganisms(such as mold and yeast)The survival of human beings needs oxygen, and vacuum packaging uses this principle to remove the oxygen in the packaging bag and food cells, so that the microscopic matter loses”living environment”.What problems should be paid attention to when choosing vacuum packaging bagsIn what environment are vacuum bags used. Including processing technology environment, storage environment, transportation environment, different environments require different plastic films and printing processes to be selected. For example, the ready-to-eat brine duck feet, after being vacuum-packed, are sterilized at high temperature and boiled, so the material requirements for the packaging bags are different.High temperature sterilization requires plastic film to withstand high temperature121Above ℃, boiling sterilization requires high temperature resistance100℃, and it is not water soluble in high temperature environment, and the water resistance is stronger.Other needs to protect food. The use of vacuum bags for food is to prolong the shelf life and better preserve its color, aroma and taste. In addition to the need for puncture resistance, there are many other performance requirements. For example, salt-baked chicken legs and salt-baked chicken wings will have oil and produce aromatic molecules. Plastic bags must have oil resistance and fragrance retention.Puncture resistance of plastic bags after vacuum. Whether it is transport packaging or sales packaging, one of the important functions of packaging bags is to protect food. If most of them are punctured, there is no protection.It is necessary to know whether our products have sharp and hard substances and what level of puncture ability they have reached. In the ordinary method, let the packaging manufacturer provide samples, vacuum-pack the test by yourself, and then throw, throw, press, etc., and then see if there is any bag breakage.