Multilayer system: the addition of the plastic film was the initial step to create brick containers impermeable to liquids and heat-sealable. Within the 1960s, an aluminum foil started to be additional towards the cardboard container to be sure greater defense and prolong the shelf life of the packaged product. This https://liquidsoappackaging.blogspot.com/2025/05/sustainable-packaging-for-oil-and-more.html