Multilayer technique: the addition of a plastic movie was step one to create brick containers impermeable to liquids and warmth-sealable. While in the nineteen sixties, an aluminum foil started to be additional for the cardboard container to make certain greater safety and lengthen the shelf life of the packaged product. https://gablecarton.video.blog/2025/08/10/the-packaging-industry-has-been-changed-by-water-in-sustainable-pak/