Multilayer process: the addition of a plastic movie was the first step to produce brick containers impermeable to liquids and heat-sealable. During the nineteen sixties, an aluminum foil started to be additional for the cardboard container to be certain greater safety and increase the shelf life of the packaged item. https://gabletoppak.school.blog/2025/04/09/say-goodbye-to-plastic-choose-eco-friendly-gabletop-containers/