Multilayer program: the addition of a plastic movie was the first step to generate brick containers impermeable to liquids and warmth-sealable. In the 1960s, an aluminum foil started to be added to the cardboard container to make sure much better defense and increase the shelf lifetime of the packaged products. https://leak-proofgabletopcarton.blogspot.com/2024/10/the-future-of-eco-friendly-packaging.html