Multilayer technique: the addition of a plastic film was the initial step to make brick containers impermeable to liquids and warmth-sealable. While in the 1960s, an aluminum foil started to be included to your cardboard container to be sure greater defense and increase the shelf lifetime of the packaged product https://gabletoppak.wordpress.com/2024/09/12/the-benefits-of-using-gable-top-containers-for-dairy-products/