Multilayer process: the addition of a plastic film was the first step to make brick containers impermeable to liquids and heat-sealable. In the sixties, an aluminum foil began to be additional to your cardboard container to make certain better security and lengthen the shelf life of the packaged item. Now https://sustainableliquidsoappackaging.blogspot.com/2025/05/sustainable-packaging-for-oil-and-more.html