High free-volume conveying screw element for efficient feeding of low-density materials
Increased free volume (~15%)
Improved feeding efficiency
Suitable for low bulk density materials
SK conveying screw elements are designed with an increased free volume compared to standard conveying screw elements, allowing more material to be accommodated in the screw channel.
This makes them particularly effective in feeding low bulk density materials, where conventional elements may suffer from starvation or unstable feeding.
Improves material intake and reduces feeding limitations.
Ensures consistent material supply to downstream sections.
Effective for powders and fluffy materials.
Allows more material to enter the screw.
Limits use to feeding sections.
Stabilizes feeding under variable conditions.
| Free Volume | +15% vs standard |
| Structure | Modified conveying geometry |
| Materials | Standard or wear-resistant |
A: Due to limited self-cleaning, it is mainly used in feeding sections.
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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
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
Stretching elements, also called S-type elements, improve material exchange and distributive mixing in partially melted zones.
Best suited for:
Semi-plasticized material zones
Improved dispersion
Gentle mixing processes
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
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
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
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