Enhanced mixing and pressure build-up with reverse conveying effect
Strong shear and mixing capability
Reverse conveying for pressure build-up
Increased residence time
Ideal for degassing preparation
Reverse kneading screw elements are typically designed with a reverse 45° stagger angle, providing both strong mixing capability and reverse material transport.
They generate backflow and pressure build-up, which increases material fill level and residence time.
Their pressure-building capability lies between:
Reverse conveying elements
Neutral (90°) kneading elements
This makes them particularly effective in sections where controlled pressure and mixing are required.
Provides enhanced dispersive mixing.
Creates backflow and increases material interaction.
Improves melt density and processing stability.
Adjusts material exposure time for better mixing.
Reverse flow = increased residence time + improved mixing
| 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: It increases melt pressure and fill level, improving degassing efficiency.
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Forward kneading elements provide a balance between conveying and mixing, with adjustable shear depending on stagger angle and disc width.
Best suited for:
Plastication zones
General compounding
Controlled mixing processes
Neutral kneading elements provide strong mixing with minimal conveying effect, ensuring stable residence time and high mixing efficiency.
Best suited for:
High mixing zones
Sensitive formulations
Residence time control
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