Multilayer Technique: the addition of a plastic movie was the first step to create brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil started to be additional to the cardboard container to make sure far better security and extend the shelf life of the packaged product. https://dairygabletoppackaging.finance.blog/2025/02/26/recyclable-oil-packaging-why-choose-gabletop-paks-sustainable-solutions/