Multilayer method: the addition of the plastic film was the initial step to produce brick containers impermeable to liquids and warmth-sealable. While in the 1960s, an aluminum foil started to be included on the cardboard container to make sure improved safety and increase the shelf life of the packaged products. https://dairygabletoppackaging.finance.blog/2025/04/09/how-gable-top-packaging-is-shaping-the-future-of-consumer-goods/