Optimized balance of free volume, torque capacity and conveying performance for compounding applications
Excellent conveying stability
Controlled residence time
High self-cleaning efficiency
Ideal for feeding, venting and pressure control
The double-flighted conveying screw element is the most widely used screw element in co-rotating twin screw extruders, offering an optimal balance between free volume and torque transmission capacity.
Designed typically within a Do/Di ratio range of 1.55–1.8, it ensures stable material conveying while maintaining sufficient space for material filling and melting. This makes it the dominant choice in compounding extrusion processes across a wide range of materials.
Depending on the pitch design, double-flighted screw elements can be used for conveying, pressure build-up, or residence time control, making them a versatile component in screw configurations.
Ensures efficient material transport without overloading the drive system.
Provides consistent material flow throughout the extrusion process.
Optimized geometry helps regulate material residence time for better processing consistency.
Reduces material stagnation and degradation risk.
Achieves an ideal balance between free volume and mechanical strength.
Commonly used in feeding and venting sections, allowing partial filling and improved degassing efficiency.
Applied in pressure-building zones or between kneading blocks to increase residence time and enhance melting.
Compared to single-flighted screw elements, double-flight designs provide better balance, while maintaining good conveying efficiency and process stability.
| Diameter | Ø18–Ø400 |
| Do/Di Ratio | 1.55～1.8 |
| Length | 0.5～2.5D |
| Pitch | Customized |
| Material | N00/D2/D11/W6/H9/H10/H26/Hastelloy/Stainless |
| Surface Hardness | HRC 58–64 |
| Max. Operating Temp | ≤450°C |
| Wear Resistance | Standard/High/Ultra-high |
| Corrosion Resistance | Standard/High/Ultra-high |
| Application | Masterbatch/Compounding/Recycling /Film/Feed/Food/Pharmacy |
| Suitable for | Twin Screw Extruder |
Ensures stable material intake and transport into the extruder.
Supports partial filling conditions for efficient gas removal.
Suitable for engineering plastics, masterbatch and filled materials.
Used in combination with kneading blocks to regulate pressure and residence time.
They provide the best balance between conveying efficiency, free volume and torque capacity, making them suitable for most compounding applications.
Large pitch elements are used for feeding and venting zones, while small pitch elements are suitable for pressure build-up and increasing residence time.
Yes, all elements can be tailored based on your extruder type, material and process requirements.
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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
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
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
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
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
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