Multilayer program: the addition of a plastic film was the first step to generate brick containers impermeable to liquids and heat-sealable. While in the 1960s, an aluminum foil started to be added on the cardboard container to ensure improved protection and extend the shelf life of the packaged merchandise. The https://lite.evernote.com/note/dd507a72-9ea8-57b5-f7cb-bca1536cf783