Multilayer technique: the addition of the plastic film was the initial step to help make brick containers impermeable to liquids and heat-sealable. Inside the 1960s, an aluminum foil started to be extra for the cardboard container to be certain improved security and prolong the shelf life of the packaged merchandise. https://gabletopcontainers.game.blog/2025/01/09/eco-friendly-packaging-the-future-of-sustainability-in-various-industries/