Multilayer method: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and heat-sealable. Within the sixties, an aluminum foil started to be included for the cardboard container to ensure better safety and prolong the shelf life of the packaged merchandise. The initial https://www.slideshare.net/slideshow/gable-carton-classic-design-modern-eco-friendly-solution/283386802