Multilayer method: the addition of a plastic movie was the initial step to make brick containers impermeable to liquids and heat-sealable. Inside the nineteen sixties, an aluminum foil began to be included to the cardboard container to make certain greater security and increase the shelf lifetime of the packaged product. https://dairycartonssustainability.blogspot.com/2025/02/sustainable-packaging-solutions-rise-of.html