Multilayer process: the addition of the plastic movie was the initial step to create brick containers impermeable to liquids and heat-sealable. From the sixties, an aluminum foil started to be included towards the cardboard container to guarantee better protection and prolong the shelf life of the packaged product or service. https://edibleoilgabletoppackagings.blogspot.com/2025/06/sustainability-in-every-drop-eco.html