Multilayer program: the addition of a plastic film was step one for making brick containers impermeable to liquids and heat-sealable. In the 1960s, an aluminum foil began to be included to the cardboard container to guarantee improved security and prolong the shelf life of the packaged solution. This technique enables https://packagingforliquidsoap.blogspot.com/2025/05/shaping-sustainable-future-with-eco.html