Multilayer technique: the addition of the plastic film was the first step to generate brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil began to be added into the cardboard container to be certain better safety and lengthen the shelf lifetime of the packaged solution. https://dairycartonpackaging.blogspot.com/2024/11/the-versatility-and-sustainability-of.html