Multilayer program: the addition of a plastic film was step one to produce brick containers impermeable to liquids and heat-sealable. While in the 1960s, an aluminum foil began to be additional to the cardboard container to guarantee improved safety and extend the shelf life of the packaged product or service. https://sites.google.com/view/gabletoppak/how-water-in-sustainable-pak-is-revolutionizing-the-packaging-world