Multilayer method: the addition of a plastic movie was the first step for making brick containers impermeable to liquids and warmth-sealable. In the 1960s, an aluminum foil began to be added into the cardboard container to guarantee superior defense and increase the shelf life of the packaged product or service. https://wateringabletoppak.wordpress.com/2025/02/07/innovative-eco-friendly-packaging-solutions-for-a-sustainable-future/