Twin-Screw Extruder: Masterbatch & Compounding Price Guide 2026
Twin-Screw Extruder (Masterbatch): Specifications & Price Guide 2026
The definitive engineering guide to high-density polymer compounding. Discover how co-rotating twin-screw extruders guarantee 100% pigment dispersion and thermal stability for color masterbatch and engineering plastics.
In the plastics and masterbatch industry, achieving a perfectly homogenous polymer melt is the dividing line between high-value raw materials and rejected scrap. Compounding engineers constantly battle three critical failures: "How do we prevent un-dispersed pigment spots in color masterbatch, how do we stop abrasive mineral fillers (CaCO3, Talc) from destroying our screws in months, and how do we control shear heat so the polymer doesn't burn?"
Single-screw extruders are sufficient for simple melting, but they lack the distributive and dispersive mixing required for complex formulations. The POLYC Co-Rotating Twin-Screw Extruder is engineered specifically for intensive compounding. Utilizing intermeshing, self-wiping screws loaded with customizable kneading blocks, it physically crushes pigment agglomerates into the polymer matrix. Integrated multi-zone PID temperature control ensures the exact melt temperature is maintained, preventing thermal degradation of sensitive resins.
From high-concentration black masterbatch to glass-fiber reinforced engineering plastics, POLYC customizes the L/D (Length/Diameter) ratio, gearbox torque capacity, and barrel metallurgy to match your specific bulk density and abrasive wear challenges.
POLYC Heavy-Duty Extrusion & Compounding Line: Designed for high-torque continuous processing, ensuring perfect homogenization before downstream pelletizing.
Twin-Screw Extruder Specifications & Working Capacities
| Model Series | Screw Diameter (mm) | Typical L/D Ratio | Main Motor Power | Estimated Output (kg/h) | Investment Tier |
|---|---|---|---|---|---|
| 1. Lab Compounding Extruder | 20 mm – 35 mm | 32:1 to 44:1 | 4 kW – 15 kW | 5 – 30 kg/h | Entry Lab Tier |
| 2. Standard Masterbatch Line | 65 mm – 75 mm | 40:1 to 48:1 | 90 kW – 160 kW | 250 – 800 kg/h | Core Production Tier |
| 3. Heavy Duty Filler Extruder | 95 mm – 135 mm | 44:1 to 52:1 | 250 kW – 600 kW | 1,000 – 3,000+ kg/h | Heavy Industrial Tier |
*Note: Output capacities vary significantly based on material bulk density, filler percentage, and specific heat capacity. All POLYC extruders feature bimetallic barrels and high-wear tool-steel screw elements for processing abrasive minerals.
How to Select Your Extrusion Configuration
Scenario A: High-Concentration Color Masterbatch
Process Profile: Compounding 40% to 60% pigment powder into PE/PP carriers. Requires extreme dispersive shear to break pigment clusters down to < 5 µm.
Optimal Configuration: Twin-Screw Extruder with a dense Kneading Block profile (L/D 44:1) + Water-Ring or Strand Pelletizer. Requires precise barrel cooling to offset intense internal shear heat.
Scenario B: High-Filler Masterbatch (CaCO3 / Talc)
Process Profile: Loading 70% to 85% calcium carbonate or talc into a polymer binder. The mixture is highly abrasive and generates massive torque resistance.
Optimal Configuration: Twin-Screw Extruder with Bimetallic Liners + Air-Cooling Hot Face Pelletizer. A side-feeder is mandatory to inject the fluffy powder downstream into the already-melted polymer.
Scenario C: Glass-Fiber Reinforced Plastics
Process Profile: Adding 30% glass fibers to PA, ABS, or PET. The fibers must be dispersed evenly but not pulverized into dust, preserving their structural length.
Optimal Configuration: Twin-Screw Extruder with Downstream Side Feeder. The polymer is melted first; the glass fibers are fed midway down the barrel into a gentle distributive mixing zone.
Scenario D: Cable Compounds (PVC, XLPE, LSZH)
Process Profile: Highly heat-sensitive materials that will degrade, cross-link, or burn instantly if subjected to excessive shear or temperature spikes.
Optimal Configuration: Two-Stage Compounding Line. A high-speed twin-screw melts and mixes the additives, immediately dropping the melt into a slow-turning single-screw extruder for gentle cooling and pressure building.
The Complete Compounding Ecosystem
Pre-Mixing Blenders
High-speed mixers used to pre-blend resin pellets, waxes, and pigments before extrusion.
Loss-in-Weight Feeders
Automated gravimetric hoppers ensuring exact powder-to-resin ratios entering the barrel.
Twin-Screw Extruders
The core compounding unit delivering intense dispersive and distributive shear.
Turnkey Plants
Complete EPC engineering integrating extruders, water baths, pelletizers, and silos.
Engineering Architecture: Defeating Agglomerates & Wear
1. Co-Rotating Self-Wiping Mechanics
Unlike counter-rotating screws, POLYC twin-screw extruders feature co-rotating, fully intermeshing profiles. As the two screws turn in the same direction, the flight of one screw continuously wipes the root of the other. This "self-wiping" action prevents polymer from stagnating and degrading inside the barrel, ensuring a highly uniform, narrow residence time distribution essential for color consistency.
2. Modular Screw Elements (Kneading Blocks)
The screw is not a single solid piece; it is built by sliding individual segments onto a splined shaft. Conveying elements move the material forward, while Kneading Blocks (arranged at 45°, 60°, or 90° angles) generate intense dispersive shear to crush pigment agglomerates. This modularity allows process engineers to instantly reconfigure the shear profile when switching from a gentle glass-fiber run to an aggressive carbon-black run.
3. Vacuum Devolatilization
Moisture, trapped air, and volatile organic compounds (VOCs) within the polymer melt will cause bubbles and porosity in the final pellet. POLYC extruders feature dedicated vacuum venting zones along the barrel. Under deep vacuum, these gases are forcibly extracted from the melt just before the die head, guaranteeing dense, defect-free masterbatch pellets.
What Determines the Price of a Twin-Screw Extruder?
1. Gearbox Torque Density
The heart of an extruder is its transmission. Pushing 80% Calcium Carbonate (CaCO3) requires immense torque. Upgrading from a standard symmetric gearbox to a high-torque, asymmetric precision gearbox allows the machine to process stiffer melts at higher throughputs without shaft failure, driving up initial CapEx.
2. Bimetallic Wear Metallurgy
Processing glass fibers or harsh minerals acts like liquid sandpaper inside the machine. Standard nitrided steel barrels will wear out in months. Upgrading to bimetallic alloy liners (e.g., α101) and PM-HIP tool steel screw elements exponentially increases wear resistance and machine lifespan.
3. Gravimetric Feeding Automation
Basic lines use volumetric feeders (screw speed equals volume). However, powder density fluctuates. Adding automated Loss-in-Weight (LIW) gravimetric feeders ensures that the exact mass of pigment and resin enters the barrel second-by-second, preventing costly off-spec color variations.
4. Pelletizing System Selection
A simple water-bath strand pelletizer is economical. Upgrading to an Underwater Pelletizer (UWP) or an Air-Cooling Hot Face system (for water-sensitive polymers) requires complex die-head engineering and drying centrifuges, adding to the complete line cost.
Why Source Your Extrusion Line from POLYC?
CNC machining, gearbox assembly, and full turnkey extrusion line testing at POLYC's 9,000 m² Wuxi manufacturing facility.
🏭 Complete EPC Engineering
Shanghai Polyc Technology Co., Ltd. is not a generic machine assembler. We engineer the complete compounding ecosystem. From upstream high-speed blenders and gravimetric feeders to the high-torque twin-screw extruders and downstream pelletizing units, everything is designed and integrated within our 9,000 m² Wuxi facility.
🤝 3-Year Global Warranty
Continuous polymer compounding demands robust mechanics. Genuine POLYC extruders include an industry-leading 3-Year Global Warranty covering the main drive motors, gearboxes, and heavy frames. Replacement screw elements and heater bands are maintained in stock for rapid global dispatch.
🧪 Free Screw Profile Design
The secret to flawless dispersion is the screw profile. Share your exact material formulation with our Wuxi engineering desk. Our polymer chemists will design a custom arrangement of conveying, kneading, and mixing elements tailored specifically to your resin and pigment loading.
Ready to Optimize Your Polymer Compounding?
Tell us your base resin (PE/PP/ABS/PET), filler or pigment percentage, and target hourly capacity (kg/h). POLYC engineering will recommend the exact extruder size, screw profile, and pelletizer system within 24 hours.
Frequently Asked Questions
Why should I use a Twin-Screw Extruder instead of a Single-Screw?
What does L/D Ratio mean, and how do I choose it?
How do I prevent my screws from wearing out so fast?
Why is my polymer burning or degrading inside the extruder?
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