Multilayer Program: the addition of the plastic movie was the first step to make brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil started to be added to the cardboard container to ensure much better protection and increase the shelf lifetime of the packaged products. https://gabletopcartonsformilk.blogspot.com/2025/05/revolutionizing-dairy-with-eco-friendly.html