Multilayer process: the addition of a plastic movie was the first step for making brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil began to be added into the cardboard container to be sure improved protection and lengthen the shelf lifetime of the packaged products. https://gabletopcartons.school.blog/2024/10/29/exploring-the-versatility-of-gable-top-packaging/