Multilayer method: the addition of the plastic movie was step one to make brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil began to be extra to the cardboard container to be certain much better security and lengthen the shelf lifetime of the packaged item. https://premiumgabletopcartons.blogspot.com/2024/10/the-future-of-eco-friendly-packaging.html