Multilayer process: the addition of a plastic movie was the first step for making brick containers impermeable to liquids and warmth-sealable. While in the sixties, an aluminum foil started to be extra to the cardboard container to guarantee much better defense and increase the shelf life of the packaged merchandise. https://gablecarton.art.blog/2024/10/05/embracing-sustainability-with-water-in-gabletop-pak/