Multilayer process: the addition of a plastic film was the first step to make brick containers impermeable to liquids and heat-sealable. In the 1960s, an aluminum foil began to be added on the cardboard container to guarantee better safety and lengthen the shelf lifetime of the packaged product. This requires https://gabletopsoappackaging.blogspot.com/2025/01/the-rise-of-gable-top-box-packaging.html