Multilayer technique: the addition of a plastic movie was the initial step to create brick containers impermeable to liquids and heat-sealable. From the sixties, an aluminum foil started to be extra on the cardboard container to make certain improved protection and lengthen the shelf lifetime of the packaged products. This https://alternatetotetrapak.blogspot.com/2025/08/water-in-paper-pak-smart-sustainable.html