Multilayer Technique: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and warmth-sealable. During the nineteen sixties, an aluminum foil began to be added to your cardboard container to make sure improved protection and prolong the shelf life of the packaged item. https://gabletoppakpackaging.blogspot.com/2025/01/the-versatility-and-sustainability-of.html