Single-screw extruder having a rotatable screw and a grooved bush arranged in the region of the feed zone

摘要

Single-screw extruder having a rotatable screw and a grooved bush which is arranged in the region of the feed zone and has, in the region of a feed opening, a feed pocket having an axial bore which has a larger diameter than the external diameter of the screw and is designed such that it tapers in the transport direction to a diameter corresponding to the external diameter of the screw, the feed pocket which has a larger diameter being designed to extend beyond the leading edge of the feed opening (8) by an axial length (a) in the conveying direction of the screw and the following equations applying: 0.2 . s /= a /= 0.8 . s 0.2 . /= k /= 0.8 . s a + k /= 1.4 . s where d corresponds to the external diameter, s to the screw pitch and k to the axial length of the conical taper of the grooved bush (2). IMAGE