Multilayer procedure: the addition of a plastic movie was step one to make brick containers impermeable to liquids and warmth-sealable. In the sixties, an aluminum foil started to be extra towards the cardboard container to be sure much better security and prolong the shelf life of the packaged product or https://share.evernote.com/note/b31fb28c-50e7-ac72-5294-5271f8d9105e