Multilayer Technique: the addition of a plastic film was the first step to help make brick containers impermeable to liquids and warmth-sealable. Within the 1960s, an aluminum foil started to be included on the cardboard container to make certain better defense and extend the shelf life of the packaged merchandise. https://paperbottlemanufacturer.blogspot.com/2025/04/how-paper-bottles-and-gable-top-cartons.html