Multilayer program: the addition of the plastic film was the initial step to produce brick containers impermeable to liquids and warmth-sealable. During the sixties, an aluminum foil began to be added on the cardboard container to ensure far better safety and extend the shelf lifetime of the packaged products. The https://share.evernote.com/note/43c0a327-a710-724a-4244-2749efcb3893