Multilayer technique: the addition of a plastic movie was the first step to generate brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil began to be additional into the cardboard container to guarantee much better safety and lengthen the shelf life of the packaged merchandise. https://paperwaterbottle.travel.blog/2025/06/09/gable-top-milk-carton-a-smarter-sip-towards-a-greener-future/