Multilayer Method: the addition of a plastic film was step one to generate brick containers impermeable to liquids and warmth-sealable. From the 1960s, an aluminum foil started to be included towards the cardboard container to guarantee much better safety and increase the shelf life of the packaged solution. Final result https://customizedgabletopwatercarton.blogspot.com/2025/04/how-gable-top-cartons-and-paper-water.html