Multilayer method: the addition of a plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. Inside the nineteen sixties, an aluminum foil started to be additional for the cardboard container to be sure greater defense and prolong the shelf life of the packaged solution. https://topcartons.movie.blog/2025/05/05/dairy-liquid-packaging-with-gable-top-innovation-and-eco-friendly-materials/