Multilayer process: the addition of the plastic film was the first step to generate brick containers impermeable to liquids and warmth-sealable. Within the 1960s, an aluminum foil started to be added for the cardboard container to be certain much better protection and extend the shelf life of the packaged products. https://gabletoppackaging.tech.blog/2025/02/07/gable-top-boxes-revolutionizing-sustainable-packaging/