Enhanced distributive mixing through continuous material reorientation
Improved material exchange
Gentle mixing mechanism
Increased dispersion uniformity
Stretching screw elements are designed to enhance material layer reorientation and exchange, improving distributive mixing without excessive shear.
They are typically arranged in alternating orientations to maximize the stretching and folding of material flow.
Continuously redistributes material layers.
Promotes uniform distribution of additives.
Prevents degradation of sensitive materials.
Forces material to change direction repeatedly.
Increases interfacial contact area.
Maximizes mixing efficiency.
| Structure | S-shaped geometry |
| Arrangement | Alternating pairs |
| Materials | Customized |
A: It improves mixing through flow reorientation rather than shear.
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Double flight conveying elements are the most widely used design in twin screw compounding. They provide the best balance between free volume and torque transmission.
Best suited for:
Feeding sections
Venting zones
Pressure control sections
Single flight conveying elements provide higher conveying efficiency than standard double flight elements. Their wider flight design reduces leakage flow and increases pressure-building capability.
Best suited for:
Feeding sections
Extrusion zones
Applications requiring strong conveying force
Triple flight elements provide strong distributive mixing with lower shear. They are commonly used in melt mixing sections where gentle material distribution is required.
Best suited for:
Melt distribution
Sensitive materials
Low-shear compounding
Transition elements are designed to connect different screw element geometries while minimizing dead zones and material retention.
Best suited for:
Transition between single and double flight elements
Connection between SK and standard conveying elements
Geometry change zones within complex screw configurations
SK conveying elements provide approximately 15% higher free volume than standard conveying elements and are particularly suitable for low bulk density materials.
Best suited for:
Feeding zones
Side feeding
Low bulk density materials
SSK conveying elements combine the strong conveying ability of single flight elements with increased free volume.
Best suited for:
Difficult-to-feed materials
Low-density powders and fillers
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