Multilayer procedure: the addition of a plastic movie was the first step to make brick containers impermeable to liquids and warmth-sealable. Within the 1960s, an aluminum foil began to be included on the cardboard container to make certain better safety and increase the shelf life of the packaged merchandise. This https://www.evernote.com/shard/s525/sh/2323d1c0-f24f-518e-08ed-568053331797/sMN4hmWE4MtfJxg4p5px5AjOOku_t-cFMUVKqmKsjQeBadsFb0juJZhrMw