Vacuum Packaging Bag Technology Principles

From a technical perspective, vacuum packaging bags are typically made using multi-layered composite materials. These materials may include polyethylene (PE), polypropylene (PP), nylon (PA), or aluminum foil, which are bonded together through processes such as co-extrusion, coating, or lamination to form a composite film with barrier properties, mechanical strength, and heat-sealing performance. During the vacuum packaging process, the items are first placed in the bag, then a vacuum packaging machine is used to remove the air from the bag, and finally the bag opening is sealed to create a vacuum environment.