Multilayer method: the addition of the plastic film was step one to help make brick containers impermeable to liquids and warmth-sealable. Inside the sixties, an aluminum foil began to be extra on the cardboard container to make sure far better security and lengthen the shelf lifetime of the packaged products. https://dairygabletoppackaging.finance.blog/2025/01/09/eco-friendly-packaging-the-future-of-sustainability-in-various-industries/