Multilayer procedure: the addition of a plastic film was the first step for making brick containers impermeable to liquids and heat-sealable. In the sixties, an aluminum foil began to be additional to the cardboard container to be sure superior security and increase the shelf life of the packaged merchandise. The https://oilrecyclablepackaging.blogspot.com/2025/08/the-role-that-gable-top-cartons-are.html