Multilayer process: the addition of a plastic film was the initial step to produce brick containers impermeable to liquids and heat-sealable. During the 1960s, an aluminum foil started to be additional for the cardboard container to ensure better defense and extend the shelf life of the packaged product or service. https://cartonpackagingdairy.blogspot.com/2025/02/gable-top-box-versatile-and-sustainable.html