High conveying efficiency and strong pressure-building capability for demanding extrusion processes
Superior conveying capacity
Reduced leakage flow
Enhanced pressure build-up
Efficient material transport
The single-flighted conveying screw element is designed to deliver maximum conveying efficiency by utilizing a wider flight geometry compared to multi-flight designs.
This configuration reduces inter-channel leakage and increases forward transport force, making it particularly effective in applications where strong material conveying and pressure build-up are required.
However, due to its reduced free volume, it is typically applied in sections where conveying performance is prioritized over material accommodation.
Provides strong forward transport, especially for high-throughput applications.
Wider flight design minimizes backflow between screw channels.
Suitable for sections requiring compression and melt densification.
Efficient transport reduces material exposure time to heat.
Reduces leakage but limits free volume.
Leads to higher fill level and improved pressure transmission.
Contributes to melt homogenization but must be controlled for sensitive materials.
| 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 |
A: When higher conveying force and pressure build-up are more important than maximum free volume.
A: Usually in the feeding section and extrusion section.
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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
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
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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