Multilayer Process: the addition of the plastic film was the first step to make brick containers impermeable to liquids and warmth-sealable. While in the nineteen sixties, an aluminum foil began to be included to the cardboard container to make certain greater safety and lengthen the shelf life of the packaged https://share.evernote.com/note/015c690e-0c57-903b-d9f5-57b394c3a4fb