Multilayer technique: the addition of a plastic film was the first step to produce brick containers impermeable to liquids and heat-sealable. Within the 1960s, an aluminum foil started to be included into the cardboard container to ensure better security and increase the shelf life of the packaged solution. This technique https://ecofriendlypackagingwater.blogspot.com/2025/03/eco-friendly-packaging-for-water.html