Multilayer Technique: the addition of the plastic movie was the first step to produce brick containers impermeable to liquids and warmth-sealable. In the 1960s, an aluminum foil began to be included towards the cardboard container to ensure much better safety and prolong the shelf lifetime of the packaged product. The https://share.evernote.com/note/6fbe321e-0002-795d-0d05-fc4272495718