Multilayer technique: the addition of the plastic film was the initial step to create brick containers impermeable to liquids and warmth-sealable. Inside the 1960s, an aluminum foil began to be additional to your cardboard container to be certain much better safety and prolong the shelf life of the packaged product. https://customliquidsoappackaging.blogspot.com/2024/11/the-versatility-and-sustainability-of.html