Multilayer Procedure: the addition of a plastic film was the initial step to make brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil started to be additional on the cardboard container to be certain improved defense and lengthen the shelf life of the packaged merchandise. https://dairygabletoppackaging.finance.blog/2025/01/09/the-impact-of-gable-top-cartons-on-sustainable-packaging-in-various-industries/