High-yield Optimized Screw Structure
Optimized screw design improves plasticizing stability.
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Product Details
SJ120/38 Single Screw Extruder is designed for large diameter HDPE gas and water pipe extrusion applications requiring stable melt pressure, precise wall thickness control and efficient plasticization. The 38:1 long L/D barrier screw supports superior homogenization for virgin and recycled HDPE materials with a maximum output of 1200-1400 kg/h.
Materials to be processed
HDPE / PP materialRaw Material
1200-1400 KG/HrOutput Capacity
SJ120/38Extruder Model
355 KW SIMOMain Motor
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Core Advantages
Heavy-Duty Premium Drive Configuration
Reliable drive control keeps operation stable.
Complete Raw Material Preprocessing System
PLC touch control simplifies operation and monitoring.
Matching Spiral Extrusion Mold
Comes with LXGM1200 spiral basic mold with mature spiral flow.
Intelligent Siemens PLC Control
Stable output supports efficient continuous production.
Excellent Compatibility & Global Service
Reliable drive control keeps operation stable.
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The Production Line Consists Of
Single Screw Extruder
The SJ120/38 features a single screw design known for simple and effective melting and mixing. The 120mm screw diameter and 38:1 L/D ratio provide excellent processing capability for a wide range of polymers.
Vacuum Loader
The integrated vacuum loader system automatically conveys raw materials from storage bins to the extruder hopper, minimizing manual handling and reducing dust or moisture contamination.
Hopper Dryer
The 600 KG hopper dryer removes moisture from hygroscopic materials before they enter the extruder. Temperature control and airflow management help maintain stable material condition and final product quality.
Gravimetric Weighing System
The TW-1400 gravimetric weighing system provides accurate material feed rate measurement and control. It helps maintain precise dosing, product consistency and real-time linkage with the extruder control system.
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Technical Parameters
| Extruder Model | Main Motor Power | Barrel Heating Power | Max. Rotating Speed | Max. Output |
|---|---|---|---|---|
| SJ45/33 | 30 KW | 12 KW | 118 RPM | 60~100 KG/H |
| SJ50/33 | 37 KW | 15 KW | 118 RPM | 80~120 KG/H |
| SJ60/33 | 55 KW | 14 KW | 130 RPM | 100~200 KG/H |
| SJ60/38 | 75 KW | 19 KW | 148 RPM | 180~300 KG/H |
| SJ65/33 | 55 KW | 20 KW | 150 RPM | 180~220 KG/H |
| SJ75/36 | 132 KW | 35 KW | 150 RPM | 350~450 KG/H |
| SJ75/38 | 160 KW | 35 KW | 165 RPM | 350~450 KG/H |
| SJ90/33 | 185 KW | 40 KW | 120 RPM | 450~550 KG/H |
| SJ90/38 | 250 KW | 40 KW | 165 RPM | 800~900 KG/H |
| SJ120/38 | 355 KW | 72 KW | 165 RPM | 1200~1400 KG/H |
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Factory Strength
20+Years Experience
20MAnnual Sales
72hPre-delivery Test
CE & ISOCertified Machines
Integrated factory and exporter with independent R&D, mould machining, complete machine inspection, and overseas commissioning support.
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Delivery & Container Loading
Polestar Machinery arranges machine packing, container loading checks, and export delivery coordination for plastic extrusion lines and auxiliary equipment.
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Customer Projects
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Frequently Asked Questions
Q1: What is the model of your single screw extruder? What does SJ120/38 mean?
SJ120/38 means the screw diameter is 120mm and the L/D ratio is 38:1. This long L/D design is suitable for large diameter HDPE water and gas pipe production.
Q2: What materials can this extruder process?
It is mainly used for HDPE, MDPE, PE100 and PE80 raw pellets. It is also compatible with PP, clean recycled PE scraps and PE with carbon black or calcium carbonate filler. It is not suitable for PVC without a special vented barrel.
Q3: Which pipe sizes match the SJ120/38 extruder?
It is suitable for HDPE pipe OD 250mm to 630mm water supply and gas pipeline production, and can also be used for thick PP sheet and hollow grid board production.
Q4: What is the maximum output capacity of SJ120/38?
Stable continuous output is 1200-1400 kg/h for HDPE PE100 virgin material.
Q5: How do you guarantee stable melt pressure and pipe wall thickness?
The screw ensures uniform plasticization with stable melt pressure. The system can support online gravimetric wall thickness control linkage and closed-loop automatic screw speed adjustment when pressure changes.
Q6: Does the long L/D 38:1 screw cause material degradation?
No. The barrier screw uses a mild shear design with slow temperature rise, supporting low-temperature extrusion and helping avoid yellow streaks, inner surface pits and PE pipe stress cracking.