Multilayer technique: the addition of the plastic movie was the initial step for making brick containers impermeable to liquids and warmth-sealable. While in the nineteen sixties, an aluminum foil began to be additional into the cardboard container to guarantee improved safety and prolong the shelf lifetime of the packaged solution. https://waterinpaperbottle.car.blog/2025/09/24/water-in-sustainable-pak-a-choice-that-protects-generations/