Multilayer method: the addition of a plastic film was step one for making brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil started to be added on the cardboard container to make sure superior protection and extend the shelf life of the packaged solution. Now https://dairygabletoppackaging.finance.blog/2025/01/09/the-impact-of-gable-top-cartons-on-sustainable-packaging-in-various-industries/