Function
Vacuum packing is typically done by a machine designed for the purpose. First, the item is wrapped in a plastic bag or placed in a suitable container, depending on the type of product. This package is placed in a chamber inside the machine, where a pump sucks out the air until the pressure drops to some specified level. Finally, the machine heat-seals the plastic bag or other package to prevent any air from coming back in. Applying heat and pressure to the lips of the plastic bag seals them together to create an air-tight package.