Multilayer program: the addition of a plastic film was step one for making brick containers impermeable to liquids and warmth-sealable. Inside the sixties, an aluminum foil began to be extra into the cardboard container to be certain better safety and increase the shelf life of the packaged product or service. https://share.evernote.com/note/06681a59-fb97-a7da-c16b-8caf2dd9f085