Multilayer Program: the addition of the plastic film was step one to make brick containers impermeable to liquids and heat-sealable. While in the nineteen sixties, an aluminum foil started to be included into the cardboard container to be certain better safety and lengthen the shelf lifetime of the packaged item. https://gabletopcartons.home.blog/2025/08/10/the-packaging-industry-has-been-changed-by-water-in-sustainable-pak/