Multilayer method: the addition of the plastic film was the initial step for making brick containers impermeable to liquids and heat-sealable. While in the nineteen sixties, an aluminum foil started to be included on the cardboard container to guarantee better security and extend the shelf life of the packaged products. https://customgablecarton.blogspot.com/2025/01/gable-top-box-for-versatile-packaging.html