Multilayer procedure: the addition of a plastic movie was step one to create brick containers impermeable to liquids and heat-sealable. During the 1960s, an aluminum foil began to be extra on the cardboard container to be certain better security and lengthen the shelf life of the packaged product or service. https://whitelabelledwater.blogspot.com/2025/05/sustainable-soap-packaging-for-greener.html