Multilayer process: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and warmth-sealable. From the nineteen sixties, an aluminum foil began to be included for the cardboard container to be certain greater safety and lengthen the shelf life of the packaged products. https://alkalinewatercarton.blogspot.com/2025/04/how-paper-bottles-and-gable-top-cartons.html