Multilayer Program: the addition of the plastic film was the first step to create brick containers impermeable to liquids and heat-sealable. Inside the sixties, an aluminum foil began to be included on the cardboard container to make sure much better protection and extend the shelf lifetime of the packaged merchandise. https://waterinpaperbottles.blogspot.com/2024/10/the-growing-demand-for-gable-carton.html