Multilayer system: the addition of a plastic movie was the initial step to help make brick containers impermeable to liquids and heat-sealable. Inside the 1960s, an aluminum foil began to be included to your cardboard container to be certain improved defense and increase the shelf lifetime of the packaged item. https://gabletoppackaging.blogspot.com/2025/02/gable-top-milk-revolutionary-packaging.html