Advantages of single-screw extruders: They deliver high-quality output, excellent plasticization, and low energy consumption, while also featuring low noise, smooth operation, high load capacity, and long service life. Featuring a two-stage integral design that enhances plasticization, these extruders enable high-speed, stable extrusion with superior performance. A specialized barrier‑type integrated mixing system further improves material blending, and a combination of high shear and low melt‑temperature processing allows for efficient, low‑temperature, low‑pressure metering extrusion. Moreover, their cost‑effective design makes single-screw extruders widely applicable.

However, single-screw extruders have certain limitations in practical applications, which are primarily manifested in the following aspects. Material conveyance in a single-screw extruder relies mainly on friction, which restricts its feeding performance; powders, pastes, glass fibers, and inorganic fillers are particularly difficult to feed. When the die pressure is high, backflow increases, reducing the extruder’s throughput. In the venting section, the residence time of the material is short, resulting in poor venting efficiency. Furthermore, single-screw extruders are not well suited for certain processes, such as polymer coloring or the processing of thermosetting powders.

Compared with single-screw extruders, twin-screw extruders offer numerous advantages in reducing production costs and boosting productivity, as follows:

Reducing production costs: When manufacturing masterbatches, color changes are frequently required. With conventional systems, switching products necessitates opening the open‑type processing zone for several minutes. Additionally, the mixing process can be analyzed by observing the melt profile along the entire screw. Currently, standard twin‑screw extruders require substantial amounts of purge material to clean the machine during color changes, which is time‑consuming, energy‑intensive, and wasteful of raw materials. In contrast, sectional twin‑screw extruders address this issue: during color changes, the barrel can be quickly opened in just a few minutes for manual cleaning, minimizing the need for purge material and thereby reducing costs.

Enhanced production efficiency: During equipment maintenance, conventional twin-screw extruders typically require first dismantling the heating and cooling systems, followed by the complete removal of the screw. In contrast, modular twin-screw extruders eliminate this step—simply loosen a few bolts, turn the worm‑gear housing handle to lift the upper barrel section, and the entire barrel can be opened for servicing. This approach both reduces maintenance time and lowers labor intensity.

Wear condition: Twin-screw extruders are easy to open, allowing for visual inspection of the screw elements and the barrel liner to assess wear levels, thereby facilitating timely maintenance or replacement. This prevents discovering problems only when product output is compromised, thus avoiding unnecessary waste. High torque and high rotational speed: Currently, the global trend in twin-screw extruder development is toward higher torque, higher speeds, and lower energy consumption; increased rotational speed directly translates into higher production rates. Partial‑type twin-screw extruders fall into this category, with rotational speeds reaching up to 500 rpm, giving them a distinct advantage in processing high‑viscosity, heat‑sensitive materials.

In addition, twin-screw extruders offer broad applicability and can be used to process and produce a wide variety of materials. However, they also have certain drawbacks, which manifest in the following aspects: the issue of bearing installation at high discharge rates remains unresolved; in the meshing zone and the compression section, severe wear occurs on both the barrel and the screw flights; for conical twin-screw extruders, the manufacturing costs of the screws and barrels are relatively high; and the heat generated within the barrel is limited, with most of the heat having to be supplied by external heaters.