Multilayer method: the addition of a plastic film was the first step to create brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil started to be additional on the cardboard container to guarantee much better defense and prolong the shelf life of the packaged item. The https://dairycartonssustainability.blogspot.com/2025/06/green-sips-for-better-tomorrow.html