Multilayer process: the addition of a plastic movie was the initial step for making brick containers impermeable to liquids and heat-sealable. From the nineteen sixties, an aluminum foil started to be added for the cardboard container to ensure greater safety and lengthen the shelf lifetime of the packaged product or https://paperwaterbottle.travel.blog/2025/08/26/water-in-sustainable-pak-eco-packaging-that-protects-the-planet/