Closed Screw Barrel | Twin Screw Extruder Melting & Pressure Section
Fully enclosed barrel for efficient melting, pressure build-up and stable material conveying.
Closed screw barrels serve as the primary processing chamber where solid materials undergo phase transition into a homogeneous melt under combined thermal and shear energy.
The fully enclosed structure maintains continuous pressure along the barrel, enabling stable melt formation and efficient energy conversion. Integrated heating systems combined with internal cooling channels closely following the “∞-shaped” bore ensure precise thermal regulation, allowing rapid heat exchange and preventing thermal degradation.
High-performance bimetallic liners provide excellent resistance to abrasion and corrosion, ensuring long service life under high filler or aggressive material conditions.
| Inner Diameter | 20–400 mm |
| Length | 1D～8D |
| Compatible Models | Ø18–Ø400 |
| Body Material | N00/CK45/A42/Stainless |
| Liner Material | D11/W6/ H6+/H26 |
| Liner Process | Solid sleeve/Sintering Process/Laser Cladding Process |
| "∞" Hole | Cylindricity≤0.02 mm Position≤0.04mm |
| Pressure Rating | ≤50MPa |
| Operating Temperature | 0°C to 450°C |
| Heating Method | Cast copper or aluminum heaters/heating rods/electromagnetic induction heating |
| Cooling Method | Water-cooled/air-cooled/oil-cooled |
| Connection Method | Standard flange connection/clamp-type connection |
A: They maintain full-fill conditions for stable pressure and efficient heat transfer.
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Integrated barrel combining feeding and venting functions to optimize space and enhance process flexibility.
Best suited for:
Compact configurations
Combined feeding and venting
Flexible process layouts
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
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
Barrel with vent openings enabling efficient removal of volatiles under controlled partial fill and pressure conditions.
Best suited for:
Devolatilization
Moisture removal
Vacuum venting sections
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
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
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