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This article explores the structure, types, and functions of extruder screws, which are essential in resin processing. It distinguishes between single-screw and twin-screw extruders, highlighting their respective advantages in mixing and production efficiency. The document also discusses different screw designs, such as full-flight and mixing (darmage) screws, and their impact on resin blending and production output. The key takeaway is that selecting the right extruder screw depends on the specific application and desired balance between mixing efficiency and production capacity.