Multilayer Procedure: the addition of the plastic film was the initial step to create brick containers impermeable to liquids and heat-sealable. While in the 1960s, an aluminum foil started to be extra to the cardboard container to be sure superior safety and prolong the shelf lifetime of the packaged product. https://cartongabletop.car.blog/2024/09/12/the-rise-of-gable-top-packaging-solutions/