Multilayer system: the addition of a plastic film was step one to generate brick containers impermeable to liquids and heat-sealable. During the 1960s, an aluminum foil began to be added on the cardboard container to make certain far better defense and lengthen the shelf lifetime of the packaged merchandise. The https://share.evernote.com/note/1340b718-d7cc-2d1d-9497-3423b80533da