Multilayer system: the addition of the plastic film was the first step to generate brick containers impermeable to liquids and warmth-sealable. While in the sixties, an aluminum foil started to be added to the cardboard container to make certain improved protection and lengthen the shelf life of the packaged merchandise. https://gablecarton.water.blog/2025/08/10/the-packaging-industry-has-been-changed-by-water-in-sustainable-pak/