spokes in addition the circulation afforded by the action of the flights 32 34 tends to keep the bulk density of the scrap material uniform as well as mixing various cut lengths or sizes of material to make this more uniform prior to transfer the agitation action of the flights 32 34 also acts to support the head of material in the storage zone 18 of the hopper with this arrangement it is possible to discharge from the agitation zone of the hopper with a material held in the storage zone of from up to 20 to 30 feet or greater at substantially zero pressure for some scrap materials it may be desirable to increase the length of flights 32 34 to that as shown in phantom in fig3 the scrap material then proceeds to the spiral flight screw 36 on a second shaft 25 which is located below the shaft 24 and has one end that extends through the transfer zone to the end of material transfer conduit 14 the length of conduit 14 is illustrated to be about one screw pitch length however the conduit could be as short as approximately 1 4 screw pitch length with equally satisfactory results the flight which is closely sized to the walls of conduit 14 compacts the scrap material against back pressure p indicated by arrows generated in the reprocessing unit 16 the screw is driven via the sprocket 40 attached to the end of its shaft which is in turn connected to the drive 42 via chain 44 and sprocket 46 on the drive shaft the drive 42 is a drive that.