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 additional into the cardboard container to ensure improved defense and extend the shelf lifetime of the packaged item. The initial https://gabletopcartons.school.blog/2025/06/09/innovating-sustainability-with-eco-friendly-packaging-for-water-and-beyond/