Counter Rotating Twin Screw Extruder Machine: Clamshell Barrel
Counter-Rotating Twin-Screw Extruders are characterized by their positive displacement conveying, exceptional self-cleaning capabilities, controllable shear and temperature profiles, and strong pressure generation. This technology holds an irreplaceable position for processing heat-sensitive materials (especially PVC), performing high-pressure extrusion molding, and handling formulations with high filler content or requiring frequent material changes.
| Screw diameter range(mm) | L/D | Maximum screw speed(r/min) | Motor Power(kw) | Output(kg/h) |
|---|---|---|---|---|
| >40~50 | 32~52 | ≤250 | ≥5.5 | ≥50 |
| >50~60 | ≥7.5 | ≥80 | ||
| >60~70 | ≥15 | ≥120 | ||
| >70~80 | ≥22 | ≥200 | ||
| >80~90 | ≥45 | ≥350 | ||
| >90~110 | ≥55 | ≥500 | ||
| >110~130 | ≥90 | ≥800 | ||
| >130-160 | ≥132 | ≥1000 | ||
| >160-180 | ≥160 | ≥1200 | ||
| Note: Production rate testing utilized a feedstock blend of polypropylene pellets with a Melt Flow Rate (MFR) of 4-8 g/10min (measured at 230°C under 2.16kg load), compounded with calcium carbonate (CaCO₃). | ||||
Product Quality Index
Energy Generation
Working Principle
The barrel is composed of multiple split-type cylinder units with open and closed holes, designed as a clamshellstructure for easy access.
The unique screw structure adopts a modularcombination, providing two meshing configurations: fully open (longitudinal and transverse) and fully closed between screws.
The screws rotate outward in opposite directions (can be designed for inward counter-rotation based on materials), generating a calendering effect that enables gentle low-temperature shearing of materials.
Using modularassembly, the shaft connects various screw elements (conveying elements, kneading elements, tooth-shaped elements, counter-flow elements, etc.) in series to form melting, intensive mixing, and venting sections.
Advantages
> Use a twin-screw feeder to ensure uniform and stable feeding;
> Strong kneading capability for excellent mixing, gentle shearing, and precise temperature control.
> Short L/D ratio for material heat preservation and mild processing.
> Adapts to multiple formulations without hardware changes and enables quick product switching.
> Split-type barrel design facilitates easy maintenance with short downtime.
> Reliable and durable, with modulardesign for quick replacement of wearing screw elements and liners.
> High repeatability for consistent processing results.
Application
- Suitable for devolatilization, reactive extrusion,
- Wood-plastic blending and pelletizing,
- HFFRcable compounds,
- High-concentration masterbatch,
- PET/BOPET/BOPP ultra-thin film recycling pelletizing,
- Heat-sensitive material processing,
- Profile extrusion, etc.
