Multilayer process: the addition of the plastic film was the first step to make brick containers impermeable to liquids and warmth-sealable. From the nineteen sixties, an aluminum foil started to be added towards the cardboard container to make sure better security and prolong the shelf life of the packaged product. https://ecofriendlyoilpackaging.blogspot.com/2025/08/gable-top-cartons-sustainable-way-of.html