Multilayer program: the addition of the plastic movie was the initial step for making brick containers impermeable to liquids and heat-sealable. While in the 1960s, an aluminum foil started to be included for the cardboard container to ensure better security and increase the shelf lifetime of the packaged product. This https://share.evernote.com/note/a390625d-2ff3-ca64-e38e-2112daeebd09