Multilayer method: the addition of the plastic movie was the first step to make brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil started to be added on the cardboard container to make certain greater safety and prolong the shelf life of the packaged product. The https://waterinpaperbottle.fitness.blog/2025/08/26/water-in-sustainable-pak-eco-packaging-that-protects-the-planet/