Multilayer procedure: the addition of the plastic film was the first step to generate brick containers impermeable to liquids and heat-sealable. Inside the nineteen sixties, an aluminum foil began to be added on the cardboard container to be certain greater safety and prolong the shelf lifetime of the packaged products. https://topcartons.family.blog/2025/02/07/the-rise-of-gable-top-cartons-in-packaging/