Multilayer program: the addition of a plastic film was the first step to make brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil started to be extra on the cardboard container to guarantee superior safety and extend the shelf lifetime of the packaged product. Their https://share.evernote.com/note/b31fb28c-50e7-ac72-5294-5271f8d9105e