Multilayer method: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and warmth-sealable. During the 1960s, an aluminum foil started to be extra to your cardboard container to make sure better security and extend the shelf life of the packaged products. Now https://medium.com/@GableTopPackaging/innovating-sustainability-with-eco-friendly-packaging-for-water-and-beyond-d1b27826f6a9