Multilayer Process: the addition of the plastic movie was the initial step for making brick containers impermeable to liquids and heat-sealable. From the 1960s, an aluminum foil started to be additional for the cardboard container to make certain far better protection and lengthen the shelf lifetime of the packaged product. https://dairycartonsustainability.water.blog/2025/04/09/eco-conscious-innovation-with-water-in-carton-packaging/