Multilayer process: the addition of the plastic movie was the initial step to make brick containers impermeable to liquids and heat-sealable. Inside the 1960s, an aluminum foil began to be included on the cardboard container to guarantee improved protection and lengthen the shelf lifetime of the packaged product or service. https://bestfriendlyoilpackaging.blogspot.com/2025/05/shaping-sustainable-future-with-eco.html