Multilayer Procedure: the addition of the plastic film was step one to create brick containers impermeable to liquids and warmth-sealable. Within the nineteen sixties, an aluminum foil began to be added on the cardboard container to be sure greater security and extend the shelf life of the packaged merchandise. The https://share.evernote.com/note/b0a0ca9c-9d1b-7129-6089-9b3a7535c26c