Multilayer program: the addition of a plastic film was the initial step to create brick containers impermeable to liquids and warmth-sealable. In the nineteen sixties, an aluminum foil started to be included towards the cardboard container to make sure improved protection and increase the shelf life of the packaged item. https://paperbottlesmanufacturer.blogspot.com/2025/04/how-paper-bottles-and-gable-top-cartons.html