Multilayer Program: the addition of a plastic movie was step one to create brick containers impermeable to liquids and heat-sealable. From the sixties, an aluminum foil started to be added for the cardboard container to make certain improved safety and increase the shelf life of the packaged product or service. https://www.evernote.com/shard/s525/sh/0d150525-dda7-9cde-0fea-0f0fcaa592f5/6048kTPFDHBdWeX7yWbTMZuxUkh_J-j13YkBN57gVsczUriRUTRI6K4Rvg