A helical-ribbon mixer having a rotation-symmetrical inner mixing vessel wall (2), a motor-driven central agitator axis ( 3) therein, on which, on lateral agitator arms (5), at least one helical ribbon (4) is held close to the vessel wall downwardly sloping with a circular slope (SZ) in a direction
A helical-ribbon mixer having a rotation-symmetrical inner mixing vessel wall (2), a motor-driven central agitator axis ( 3) therein, on which, on lateral agitator arms (5), at least one helical ribbon (4) is held close to the vessel wall downwardly sloping with a circular slope (SZ) in a direction of rotation (D), wherein the helical ribbon (4), vectorially combined circularly and radially, has a helical ribbon angle of slope (SN) relative to the horizontal that is greater than a gliding angle (G) on the helical ribbon (4) of a material (M) to be mixed.
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What is claimed is: 1. A helical-ribbon mixer having a rotation-symmetrical inner mixing vessel wall (2), a motor-driven central agitator shaft ( 3) therein, on which, on lateral agitator arms (5), at least one helical ribbon (4) is held close to the vessel wall downwardly sloping with a circular s
What is claimed is: 1. A helical-ribbon mixer having a rotation-symmetrical inner mixing vessel wall (2), a motor-driven central agitator shaft ( 3) therein, on which, on lateral agitator arms (5), at least one helical ribbon (4) is held close to the vessel wall downwardly sloping with a circular slope (SZ) in a direction of rotation (D), characterized in that the helical ribbon (4), vectorially combined circularly and radially, has a helical ribbon angle of slope (SN) relative to the horizontal that is greater than a gliding angle (G) on the helical ribbon (4) of a material (M) to be mixed; wherein the mixing vessel wall has a first cylinder section (21) and a second conical section (20) engaged together with a flat bottom region (23) near an outlet of the mixer, the mixing vessel wall having a steeper slope than that of the gliding angle (G), wherein the helical ribbon (4) is sloped radially downward toward the mixing vessel wall (20, 21) at least where the mixing vessel wall (20, 21) extends divergently or vertically upward; wherein the helical ribbon (4) has a helical ribbon width (B) between 10% and 20% of a helical ribbon radius (R) at that location; wherein the helical ribbon (4) has a lateral clearance (S) to the mixing vessel wall (2) and is radially sloped toward the same such that, when driven, it conveys the material (M) to be mixed partly outward further up and inwardly circulating at the bottom, and partly upward, and wherein the helical ribbon (4F) incorporates on its side closest to the wall a downwardly divergent clearance angle (F). 2. A helical-ribbon mixer according to claim 1, characterized in that the agitator shaft (3) and the axis of the mixing vessel wall (2) incorporate an axis angle of slope (A) against the vertical (V), that the same vectorially together with the helical ribbon angle of slope (SN) is greater than the gliding angle (G) so that each helical ribbon section during one rotation of the agitator shaft in each case is temporarily sloped more toward the horizontal plane than the gliding angle (G). 3. A helical-ribbon mixer according to claim 1, characterized in that the helical ribbon (4) or helical ribbon sections ( 40, 41, 42) of the same are held on the agitator shaft (3) by the agitator arms (5), each of which incorporates a surface (50) that is designed in such a way that during one rotation of the agitator shaft it is in each case temporarily sloped more toward the horizontal than the gliding angle (G). 4. A helical-ribbon mixer according to claim 3, characterized in that the surfaces (50) of one or more agitator arms (5) are designed at least in their region closest to the axis sloped circularly ascending in the direction of rotation (D) in such a way that the material to be mixed (G) is conveyed downward in that region. 5. A helical-ribbon mixer according to claim 1, characterized in that it contains two helical ribbons (4A, 4B) that are circularly offset by 180째 and these are in each case divided into helical ribbon sections (40, 41, 42), which are disposed in each case offset from one another toward the agitator shaft by approximately one width (B) of a helical ribbon. 6. A helical-ribbon mixer according to claim 1, characterized in that the circular slope (SZ) of the helical ribbon (4) is between 5 degrees and 30 degrees. 7. A helical-ribbon mixer according to claim 6, characterized in that the helical ribbon (40), as its height increases, has an increasing circular slope (SZ). 8. A helical-ribbon mixer according to claim 6, characterized in that the circular slope (SZ) of the helical ribbon (40) increases in the mixer bottom region (23) against the direction of rotation (D) to approximately 20 degrees and is otherwise approximately 20 degrees. 9. A helical-ribbon mixer according to claim 1, characterized in that the helical ribbon (4E), as its height increases, incorporates an increasing or decreasing width (B). 10. A helical-ribbon mixer according to claim 1, characterized in that it has a filler neck (6) at its top and a clearing arm (51) and controllable outlet (60) at the bottom. 11. A helical-ribbon mixer according to claim 1, characterized in that at least two mixing vessels (1A, 1B), each having one mixer (1C, 1D), are disposed with parallel axes, contacting one another or slightly penetrating into one another with partially or fully opened mixer walls (2A, 2B) in that region, creating a communicating region (24). 12. A helical-ribbon mixer according to claim 11, characterized in that the mixing vessels (1A, 1B) are designed upwardly divergent and communicate with one another in a widest region (22). 13. A helical-ribbon mixer according to claim 11, characterized in that the helical band (4C) of the first mixer ( 1C) incorporates in a communicating region (24) a radially outward conveying slope so that the material to be mixed passes over into the second mixer (1D). 14. A helical-ribbon mixer according to claim 13, characterized in that the helical ribbon (4B) of the second mixer (1B) either already ends at the communicating region (24) or incorporates a radially inward conveying slope so that the material (M) to be mixed passes through both mixers (1A, 1B), both ascending, as well as falling, and sequentially. 15. A helical-ribbon mixer according to claim 13, characterized in that it has a reversible drive (30) for preparing a paste and kneading. 16. A helical-ribbon mixer according to claim 1, characterized in that the helical ribbon (4C) is sloped radially upward toward the mixing vessel wall (20, 21) at least where the adjoining mixing vessel wall (20, 21) extends divergently or vertically upward. 17. A helical-ribbon mixer according to claim 1, characterized in that the helical ribbon (4F) incorporates along its lower edge a steeply downward facing screw web (4S). 18. A helical-ribbon mixer according to claim 1, characterized in that it has a heated double-mixer wall (2D).
Rosso, Aaron Charles; Myers, Matthew Earle; Wascow, Joseph Z.; Retzke, Brian A.; Immordino, Jr., Salvatore C.; Rosenstiel, Terry L., Mixer having S-shaped paddles for mixing viscous materials.
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