Multilayer Technique: the addition of the plastic film was the initial step to make brick containers impermeable to liquids and heat-sealable. From the sixties, an aluminum foil began to be added to your cardboard container to make sure improved defense and lengthen the shelf lifetime of the packaged solution. Result https://gabletopcartondesign.blogspot.com/2025/02/gable-top-milk-revolutionary-packaging.html