Multilayer Technique: the addition of a plastic movie was step one to create brick containers impermeable to liquids and heat-sealable. While in the nineteen sixties, an aluminum foil started to be included for the cardboard container to guarantee much better protection and lengthen the shelf lifetime of the packaged item. https://topcartons.fitness.blog/2025/02/06/the-growing-trend-of-packaging-for-liquid-soap/