Multilayer system: the addition of the plastic movie was the first step to produce brick containers impermeable to liquids and warmth-sealable. During the sixties, an aluminum foil began to be added to the cardboard container to make certain much better security and prolong the shelf life of the packaged merchandise. https://www.slideshare.net/slideshow/gable-top-carton-multi-layer-strength-with-sustainable-materials/282717083