Multilayer process: the addition of a plastic movie was the first step to help make brick containers impermeable to liquids and heat-sealable. Within the 1960s, an aluminum foil began to be added towards the cardboard container to be sure better defense and increase the shelf lifetime of the packaged product. https://gabletopcartons.school.blog/2025/06/09/sustainable-thinking-begins-with-gable-top-carton-manufacturers/