The main PE film of Vacuum Food Bag , the secret of helping food preservation
I believe that Vacuum Food Bag is not uncommon for everyone. It is a packaging method in which the air in a sealed bag is pumped out, so that the bag after the air is pumped out reaches a vacuum. Because the air in the bag is completely drawn out, the bag is in a state of scarce air and low oxygen, and because the vacuum environment refers to anaerobic, it is named vacuum packaging.
This packaging method makes the microorganisms have no conditions for survival, so it can ensure the freshness of the food to the greatest extent and extend the shelf life of the food. But pay special attention to the fact that fruits and vegetables do not belong to this category. They belong to fresh food, and a high degree of oxygen deficiency is not good. Therefore, less fruits and vegetables are vacuum-packed. Of course, dried vegetables and dried fruits are different. range or something.
Among them, the material composition of vacuum packaging is also inseparable from PE film, especially in the low-temperature field. Therefore, vacuum packaging made of PE material is also often used for vacuum packaging of frozen foods, or ordinary boiled products. With the improvement of people's living standards, my country's quick-freezing industry has developed rapidly.
Low-temperature quick-frozen food, as the name implies, needs to be stored at a low temperature below -18°C. It was early found that ordinary bags could not withstand such a low temperature. When the temperature dropped suddenly, the mechanical strength of the packaging material also decreased, making the packaging material fragile. What kind of material vacuum packaging bag can withstand low temperature? Later, vacuum packaging came into people's field of vision and discovered its excellent low temperature resistance performance, so PE vacuum bag is the best choice for packaging food in the low temperature field.
Among them, the vacuum bag of OPP/PE material is moisture-proof, cold-resistant, low-temperature heat-sealable, and economical, and is a relatively commonly used low-temperature material; the vacuum bag of PA/PE has good impact resistance and puncture resistance, and is suitable for relatively hard product packaging. The cost is relatively high, and it needs to be selected according to actual needs.