The working principle of a twin-screw extruder.
Release time:
2025-05-31 09:02
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From the perspective of operating principles, twin-screw extruders come in different meshing and non-meshing types.
1. Co-rotating intermeshing twin-screw extruder
This type of extruder is available in low-speed and high-speed versions. The former is primarily used for profile extrusion, while the latter is employed for specialized polymer processing operations.
(1) Tightly meshing extruders. Low-speed extruders feature a tightly meshing screw geometry in which the helical profile of one screw closely matches the helical profile of the other screw—this is known as conjugate screw geometry.
(2) Self-cleaning extruder. The high-speed co-rotating extruder features screws with closely matched helical profiles. These screws can be designed with relatively small screw gaps, enabling the screws to achieve a closed, self-cleaning effect. This type of twin-screw extruder is referred to as a compact, self-cleaning, co-rotating twin-screw extruder.
2. Reverse-rotating co-rotating twin-screw extruder
The gap between the two screw channels of a tightly meshing counter-rotating twin-screw extruder is extremely small (much smaller than the gap in a co-rotating twin-screw extruder), enabling it to achieve positive conveying characteristics.
3. Non-intermeshing twin-screw extruder
In a non-intermeshing twin-screw extruder, the center distance between the two screws is greater than the sum of their radii.
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