Conical Twin-Screw Extruder

SJSZ 51/105

SJSZ 51/105 Conical Twin-Screw Extruder

Industrial Twin-Screw Extruder for PVC Processing
The SJSZ 51/105 conical twin-screw extruder is designed for continuous processing of PVC materials and the production of rigid PVC profiles, pipes and other extruded products.
The extruder features a bimetallic screw and barrel assembly made of nitrided 38CrMoAlA steel, providing high wear resistance and stable extrusion performance.
The machine is equipped with a 22 kW three-phase asynchronous motor with forced cooling, a DELTA variable frequency drive, OMRON temperature controllers, and Schneider electrical components.
The extruder includes an automatic material feeding system, vacuum degassing, air-cooled barrel heating zones, and an electrical control cabinet.

1. General Technical Specifications
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• Model: SJSZ 51/105
• Type: Conical twin-screw extruder
• Processing Material: PVC
• Production Capacity: 50–120 kg/h, depending on material and operating conditions
• Main Motor Power: 22 kW
• Motor Type: Three-phase asynchronous motor with forced cooling
• Motor Speed Control: DELTA frequency inverter
• Power Supply: 380 V, 3-phase, 50 Hz
2. Screw & Barrel
• Screw Diameter: 51/105 mm
• Screw Length: 1085 mm
• Screw Speed: 1–34.8 rpm
• Screw & Barrel Material: 38CrMoAlA, nitrided
• Screw & Barrel Design: Bimetallic
• Nitriding Depth: 0.4–0.7 mm
• Nitriding Hardness: ≥940 HV
• Surface Roughness: Ra 0.4 μm
• Bimetallic Layer Hardness: HRC 55–62
3. Heating & Cooling System
• Barrel Heating Power: 12 kW 4 zones
• Heating Zones: 10
• Heating Elements: Cast aluminum heaters
• Barrel Cooling: Forced air cooling 3 zones
• Temperature Controllers: OMRON
4. Gearbox
• Gear & Shaft Material: High-strength alloy steel
• Gear Treatment: Carburized, quenched and ground
• Gear Hardness: HRC 54–62
• Gear Precision: Grade 6
• Screw Protection: Automatic screw displacement alarm
5. Feeding & Vacuum Degassing
• Feeding Motor Power: 0.75 kW
• Feeding Speed Control: DELTA frequency inverter
• Feeding Operation: Independent or synchronized with extrusion
• Vacuum Degassing Pump: 2.2 kW
6. Control & Electrical Components
• Main Motor: 22 kW
• Motor Cooling: Forced cooling
• Main Frequency Inverter: DELTA
• Temperature Controllers: OMRON
• AC Contactors: Schneider
• Electrical Control Cabinet: Included