Multilayer method: the addition of the plastic movie was the first step to help make brick containers impermeable to liquids and heat-sealable. During the 1960s, an aluminum foil began to be extra into the cardboard container to make certain improved protection and lengthen the shelf lifetime of the packaged product. https://gabletopcarton.blogspot.com/2025/01/water-in-carton-packaging-future-of.html