Multilayer method: the addition of the plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil started to be included to the cardboard container to guarantee far better security and lengthen the shelf life of the packaged product https://gabletoppak.school.blog/2025/04/09/say-goodbye-to-plastic-choose-eco-friendly-gabletop-containers/