Multilayer Procedure: the addition of the plastic movie was the initial step to help make brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil began to be extra on the cardboard container to make certain better protection and lengthen the shelf life of the packaged product. https://ecofriendlyoilpackaging.blogspot.com/2025/03/paper-bottle-manufacturers-gabletop.html