Multilayer system: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and heat-sealable. Within the sixties, an aluminum foil began to be extra to the cardboard container to be sure better safety and increase the shelf life of the packaged solution. Gabletop https://sustainablemilkcarton.blogspot.com/2025/05/why-gable-top-packaging-is-future-of.html