RINGEXTRUDER MIT TEILGEKAPPTEN FÖRDERELEMENTEN IM EINZUGSBEREICH

The invention relates to a multi-shaft extruder for the continuous treatment and/or processing of bulk material, especially a powdery, granular or flocculent product, comprising a plurality of shafts ( 3 ) which are arranged in a crown-like manner in a cavity ( 1 ) of an extruder housing ( 2 ), said shafts extending parallel to the axial direction (A) of the extruder and forming an inner processing chamber ( 1 a) inside the crown, and an outer processing chamber ( 1 b) outside the crown. Each shaft carries a number of axially successive processing elements ( 4 ), at least part of the same being elements ( 4 a ; 4 c ; 4 e) having a transporting effect, and with which adjacent shafts engage in a sealed manner at least in partial regions. At least one transporting endless screw element ( 4 b ; 4 d ; 4 f) comprising at least one transporting screw thread ( 9, 10; 14, 15, 16; 19, 20 ) is placed in the region of the supply opening ( 21 ) in the extruder housing ( 2 ), and does not engage in a sealing manner in at least one partial region along the axial direction (A).