Multilayer system: the addition of a plastic film was step one to help make brick containers impermeable to liquids and heat-sealable. While in the sixties, an aluminum foil began to be included to the cardboard container to guarantee superior security and lengthen the shelf life of the packaged item. Their https://share.evernote.com/note/31a08530-4327-2d83-5243-9d840b237df3