초록 ▼

In a screw element for the conditioning and/or processing of plastics or elastomers in a screw-type extruding machine having screw shafts drivable to rotate in the same direction and at least one pair of meshing screw elements, each screw element having a land of which the enveloping curve extends r

In a screw element for the conditioning and/or processing of plastics or elastomers in a screw-type extruding machine having screw shafts drivable to rotate in the same direction and at least one pair of meshing screw elements, each screw element having a land of which the enveloping curve extends radially at a constant distance away from the respective shaft and, in the longitudinal direction, is of linear extension in parallel to the longitudinal axis of the shaft, a radially external screw land section near the housing running parallel to the inside wall of the housing with little play relative to the latter, for the purpose of moderate recirculation without stress points accompanied by strong axial and transverse mixing in a defined volume, it is provided that the enveloping curve encloses a blade land of reduced cross-sectional area referred to the enveloping curve, in that starting from the one axial end of the screw element and the first, in the circumferential direction external, end of the section, near the housing, of the enveloping curve, the blade ridge of the land, seen in the circumferential direction of an angle r

대표청구항 ▼

A teardrop screw element for a screw-type apparatus to condition and process plastics or elastomers comprising; said teardrop a screw element having a central bore to attach said teardrop screw element to a drive shaft, said teardrop screw element has a teardrop shape cross-section, said cross-secti

A teardrop screw element for a screw-type apparatus to condition and process plastics or elastomers comprising; said teardrop a screw element having a central bore to attach said teardrop screw element to a drive shaft, said teardrop screw element has a teardrop shape cross-section, said cross-section has a segmented cylindrical base and an upper portion with a flat apex, said apex forming an outer periphery ridge that extends longitudinally and at a constant diameter for the length of said screw element, said outer periphery ridge having an angle of twist as measured by its length that is less than 180°, and said outer periphery ridge being shaped and sized to mesh with a corresponding adjacent teardrop screw element when said teardrop screw element and said adjacent teardrop screw element rotate in the same direction.