Multilayer method: the addition of the plastic movie was the initial step to generate brick containers impermeable to liquids and heat-sealable. From the nineteen sixties, an aluminum foil began to be additional to the cardboard container to be sure better defense and extend the shelf life of the packaged solution. https://eco-friendlygabletopcartons.blogspot.com/2025/02/the-growing-demand-for-eco-friendly.html