Production printers are able to print all the way to the edge ofthe paper, and this is utilized by printing a five millimeter wide tonerstrip on the paper’s edge. When the sheet is printed, it is folded and thenexposed to heat. Toner is made of 98 percent plastic, and therefore itmelts and glues the edges together. The folded and “glued” mail itemis fed through a perforating unit and is after that it ready to be droppedinto a mailbox.