Multilayer Process: the addition of the plastic movie was the first step to produce brick containers impermeable to liquids and heat-sealable. Inside the sixties, an aluminum foil started to be included for the cardboard container to be certain far better protection and lengthen the shelf lifetime of the packaged product. https://share.evernote.com/note/2e57821a-0d6d-107b-e8b2-d649ff82b035