Patent ID: 8746955

Claim:
A screw machine with a housing ( 2 ), two housing bores ( 7 , 8 ), which have mutually parallel axes ( 9 , 10 ) and intersect one another with the formation of triangles ( 11 , 12 ), a first and a second shaft ( 13 , 14 ), which are arranged in the housing bores ( 7 , 8 ) concentrically with respectively associated axis ( 9 , 10 ), and a plurality of first and second processing elements ( 27 , 28 , 29 , 30 , 31 , 32 ) for processing material, which are arranged rotatably fixed in an axial direction one behind the other on the respectively associated first and second shaft ( 13 , 14 ) and are configured tightly meshing with one another, wherein at least one of the processing elements ( 27 , 28 , 29 , 30 , 31 , 32 ) is configured to extend the material in a flow direction ( 56 , 57 ) as an extension-kneading element ( 29 , 30 ), a crest region ( 39 , 40 ) of the extension-kneading element ( 29 , 30 ) having a thickness (D K ) in the axial direction, which is reduced relative to a flank region ( 41 ) and a crest region front side ( 42 , 43 ) facing a material feed ( 20 ) is recessed in the axial direction relative to a flank region front side ( 44 ), the thickness (D K ) in the crest region ( 39 , 40 ) proceeding from a first flank ( 37 ) of the extension-kneading element ( 29 , 30 ) up to a second flank ( 38 ) is reduced and the crest region ( 39 , 40 ), together with adjacent processing elements ( 29 , 30 ), forming an extension channel ( 54 , 55 ) for the material in a region between the triangles ( 11 , 12 ), and the crest region ( 39 , 40 ) being configured to extend the material in the flow direction ( 56 , 57 ) thereof in such a way that the extension channel ( 54 , 55 ) tapers in the cross section (Q) counter to a direction ( 18 , 19 ) of rotation and the extension channel ( 54 , 55 ) having, for the material, an outlet cross section (Q A ) which is smaller in comparison to an inlet cross section (Q E ).