Multilayer process: the addition of a plastic film was the initial step to help make brick containers impermeable to liquids and warmth-sealable. In the nineteen sixties, an aluminum foil started to be extra towards the cardboard container to guarantee better defense and increase the shelf life of the packaged product. https://gabletoppackaging.tech.blog/2025/06/09/redefining-green-packaging-with-the-power-of-gable-top-carton/