Multilayer method: the addition of a plastic film was the first step to generate brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil started to be additional on the cardboard container to ensure far better defense and prolong the shelf lifetime of the packaged product https://topcartons.family.blog/2025/08/26/gable-carton-functional-environmentally-responsible-packaging/