... GUIDE TO THE Design, Selection, and Application of Screw Feeders This page intentionally left blank GUIDE TO THE Design, Selection, and Application of Screw Feeders Ly n B a t e s Professional ... between the screw and the casing, it is good practice to allow a length of casing equal to at least one -and- a-half screw diameters between the end of the hopper and the start of the outlet, to avoid ... limitations and disadvantages of helical screws that can inhibit the application of screws, when compared with other forms of bulk handling equipment 6 Guide to Screw Feeders The interaction between the...