Multilayer program: the addition of a plastic movie was the first step to make brick containers impermeable to liquids and heat-sealable. In the nineteen sixties, an aluminum foil began to be additional into the cardboard container to guarantee far better security and extend the shelf life of the packaged products. https://sustainablesoappackagings.blogspot.com/2025/03/gable-top-carton-revolution-in.html