Multilayer program: the addition of a plastic film was the first step to generate brick containers impermeable to liquids and warmth-sealable. In the 1960s, an aluminum foil started to be included to the cardboard container to be sure far better safety and extend the shelf life of the packaged item. https://recyclableliquidsoappackaging.blogspot.com/2025/06/greener-today-sustainable-carton.html