How Do Vacuum Packaging Machines Keep Food Fresh?
May 19, 2026
A crucial aspect of vacuum packaging machines is oxygen removal. Vacuum packaging prevents food spoilage. The principle is simple: food spoilage is mainly caused by microbial activity, and most microorganisms require oxygen to survive. Vacuum packaging utilizes this principle, removing oxygen from the packaging and food cells, thus depriving microorganisms of their "living environment." So, how does a vacuum packaging machine preserve food?
1. Vacuum packaging prevents food oxidation. Oily foods contain a large amount of unsaturated fatty acids, which easily oxidize upon contact with oxygen, causing the food to spoil and change flavor. Furthermore, oxidation leads to the loss of vitamins A and C, and unstable substances in food pigments darken in color due to the effect of oxygen. Therefore, deoxygenation effectively prevents food spoilage, preserving its color, aroma, flavor, and nutritional value.
2. Another important effect is gas filling. Besides deoxygenation and preservation, vacuum gas-filled packaging also provides pressure resistance, gas barrier properties, and freshness preservation, effectively maintaining the original color, aroma, flavor, shape, and nutritional value of food for a longer period. Additionally, many foods are not suitable for vacuum packaging and require vacuum gas-filled packaging.
