Multilayer method: the addition of the plastic movie was the initial step to make brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil began to be added for the cardboard container to be certain better safety and lengthen the shelf lifetime of the packaged product https://gabletopcartons.health.blog/2025/08/10/the-packaging-industry-has-been-changed-by-water-in-sustainable-pak/