Automatic Flats Tray Unlidder (AFTU) A self-contained mechanized system based on the Automatic Flats Tray Lidder (AFTL) design as part of the material handling Integrated Dispatch and Receipt (IDR) system. It can be installed either inline or as a stand-alone device in an opening operation. Flats trays that are ready for opening can be fed… Continue reading Automatic Flats Tray Unlidder – USPS Definition