Multilayer method: the addition of a plastic movie was the initial step to help make brick containers impermeable to liquids and warmth-sealable. Within the sixties, an aluminum foil started to be added for the cardboard container to make certain greater defense and extend the shelf lifetime of the packaged merchandise. https://sites.google.com/view/gable-top-packaging/gable-top-cartons-the-future-of-sustainable-packaging