Optimized geometry transition element ensuring continuous flow and minimized dead zones between different screw profiles
Gradual cross-section transition to maintain intermeshing continuity
Reduced non-intermeshing zones and material stagnation
Improved residence time consistency
Auxiliary conveying and mild distributive mixing capability
Transition screw elements are designed to connect screw elements with different geometries or cross-sectional profiles, ensuring smooth continuity of material flow along the screw axis.
When transitioning between elements such as single flight, double flight or special conveying geometries (e.g., SK elements), abrupt structural changes can create non-intermeshing zones, leading to material stagnation, degradation or inconsistent residence time.
Transition elements are engineered to gradually modify channel geometry and flight engagement, minimizing dead zones and maintaining stable conveying conditions. In certain designs, they also contribute to moderate conveying and distributive mixing, supporting process stability across functional zones.
Gradually modifying flight depth and pitch
Maintaining consistent intermeshing engagement
Controlling local pressure and fill level
| 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: To ensure continuous flow and prevent dead zones when connecting different screw geometries.
A: Material stagnation, degradation and unstable process conditions may occur.
A: Primarily no, but some designs provide mild distributive mixing.
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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
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
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
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
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
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