Multilayer method: the addition of the plastic film was step one to generate brick containers impermeable to liquids and warmth-sealable. Within the 1960s, an aluminum foil began to be additional on the cardboard container to be sure much better security and extend the shelf lifetime of the packaged solution. The https://wateringabletop.tech.blog/2025/09/24/water-in-sustainable-pak-a-choice-that-protects-generations/