Twin Screw Extrusion Line

The twin-screw extruder has evolved from a simple forming apparatus into a multifunctional, continuous ‘process platform’ integrating physical mixing, chemical reactions, and devolatilisation separation. It stands as an indispensable key piece of equipment in modern process industries, particularly within the field of polymer materials.

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Twin-screw extrusion lines are primarily categorised into two main types based on the rotational direction and meshing configuration of the screws

Co-rotating twin-screw extruder：
Features: Both screws rotate in the same direction.

Advantages: Possesses exceptional self-cleaning capability (material is less prone to retention and decomposition), high shear rates, and outstanding distribution and dispersion mixing capabilities. Material traverses an '∞'-shaped channel between the screws, resulting in a narrow residence time distribution.

Applications: The most commonly employed type, extensively utilised for compounding and modification, venting and devolatilisation, and reactive extrusion.

Counter-rotating twin-screw extruder

Characteristics: Two screws rotate in opposite directions.
Advantages: Features forced conveying properties, strong pressure-building capability, high conveying efficiency, and relatively low energy consumption.

Classification:
Intermeshing type: Offers stable conveying capacity, used for profile extrusion (e.g., PVC pipes, profiles).

Non-intermeshing type: Superior mixing capability, though with reduced conveying and pressure-building capacity; commonly employed in reaction extrusion and material recycling.