Mature High-Efficiency Screw Design
Optimized screw design improves plasticizing stability.
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Product Details
SJ90/38 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.
Materials to be processed
HDPE / PP materialRaw Material
800-900 KG/HrOutput Capacity
SJ90/38Extruder Model
250 KW SIMOMain Motor
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Core Advantages
Reliable Top-Tier Core Power & Drive
Reliable drive control keeps operation stable.
Wide & Stable Production Capacity
Stable output supports efficient continuous production.
Complete Raw Material Pretreatment System
400kg hopper dryer removes moisture from plastic pellets in advance.
Intelligent Siemens PLC Control
Stable output supports efficient continuous production.
Consistent Product Quality & Lower Cost
Stable output supports efficient continuous production.
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The Production Line Consists Of
Single Screw Extruder
The SJ90/38 features a single screw design known for simple and effective melting and mixing. The 90mm 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 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 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 SJ90/38 mean?
SJ90/38 means the screw diameter is 90mm 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 SJ90/38 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 SJ90/38?
Stable continuous output is 800-900 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.