Multilayer process: the addition of the plastic movie was the initial step to help make brick containers impermeable to liquids and heat-sealable. During the sixties, an aluminum foil began to be extra to your cardboard container to be certain better protection and increase the shelf lifetime of the packaged merchandise. https://sustainableliquidsoappackaging.blogspot.com/2025/04/the-green-future-of-packaging.html