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1. Diameter: The diameter of the parallel twin screw is the same, and the diameter of the small end of the tapered twin screw is different from the diameter of the large end.
2. Concentric distance: The center distance of the flat twin screw is the same, the two axes of the conical twin screw are at an angle, and the size of the center distance varies along the axis.
3. Length to diameter ratio: Parallel double screw refers to the ratio of the effective part length of the screw to the outer circle of the screw. Conical twin screw (L/D) refers to the average length of the screw and the average diameter of the big end and the diameter of the small end. Ratio.
From the above, we can clearly see that the most significant difference between the parallel and conical twin-screw extruders is that the geometry of the screw barrel is different, which leads to many differences in structure and performance, although the two characteristics are different. But have their own advantages.