Multilayer program: the addition of the plastic film was step one to create brick containers impermeable to liquids and warmth-sealable. From the nineteen sixties, an aluminum foil began to be added for the cardboard container to make certain much better safety and increase the shelf life of the packaged product. https://ecofriendlyoilpackaging.blogspot.com/2025/06/tailored-for-tomorrow-sustainable.html