Multilayer technique: the addition of a plastic movie was the first step to produce brick containers impermeable to liquids and heat-sealable. In the sixties, an aluminum foil started to be added for the cardboard container to guarantee improved safety and lengthen the shelf lifetime of the packaged product or service. https://paperbottlesmanufacturer.blogspot.com/2025/06/green-sips-for-better-tomorrow.html