Multilayer technique: the addition of a plastic film was the initial step to generate brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil started to be added into the cardboard container to guarantee greater safety and increase the shelf life of the packaged item. This method https://topcartons.movie.blog/2025/07/06/why-are-brands-shifting-to-water-in-paper-pak-solutions/