Multilayer technique: the addition of a plastic movie was step one to create brick containers impermeable to liquids and heat-sealable. Inside the sixties, an aluminum foil started to be added on the cardboard container to make certain greater protection and extend the shelf lifetime of the packaged item. This technique https://share.evernote.com/note/77e47e0d-f4cf-48e2-c49f-a86df5c16652