The SJN-65 Thermoplastic Extruding Line for Insulation is a precision extrusion system engineered for high-quality insulation coating of power cables, telecom wires, and industrial tubing.
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Equipped with a φ65 mm twin-screw extruder (L/D ratio 36:1) with intermeshing screws, it achieves exceptional melt homogeneity (viscosity variation ≤3%) and output (100-300 kg/h) for thermoplastic polymers. Its multi-layer co-extrusion capability (up to 5 layers) enables complex insulation structures, while precision vacuum calibration (±0.1 mm tolerance) ensures dimensional stability across 0.5-8 mm cable diameters. Compliant with IEC 60228 and ASTM D2122, this line reduces scrap rates by 25% through advanced process control, making it ideal for high-performance insulation applications.
Extruder Performance: φ65 mm co-rotating twin-screw with 8 heating zones and kneading blocks, processing PPR (MFR 1.0-3.0 g/10min), PERT (density 0.92 g/cm3), PB (melting point 124°C), and PEX with cross-linking agents.
Material Handling: Supports 30% recycled content with dual-screen changer (60/120 mesh) and devolatilization port for moisture/volatile removal (vacuum 0.08 MPa).
Temperature Control: Electric heaters with water cooling (flow rate 10-20 L/min), maintaining barrel temperatures at 180-250°C (±1°C accuracy) via PID control.
Die Assembly: Spiral flow die with computer-optimized channel design for uniform material distribution, featuring quick-change inserts for diameter adjustments (5-50 mm).
Calibration System: Vacuum sizing tank (length 3-5 m) with multi-zone pressure control (0.02-0.08 MPa) and adjustable spray nozzles for even cooling.
Hauling Unit: Servo-driven caterpillar with precision-machined rollers (Ra ≤0.4 μm), providing traction force 5-50 kN and speed synchronization ±0.5% with extruder.
Automation Interface: Allen-Bradley Micro800 PLC with 10-inch HMI, offering real-time process visualization and data logging (1-year storage) for quality traceability.
Quality Control: Integrated laser micrometer (±0.005 mm accuracy) and melt flow meter that trigger alerts for thickness deviations >5% or pressure fluctuations >10%.
Plumbing Pipes
Manufactures PPR cold/hot water pipes (20-63 mm diameter), meeting GB/T 18742.2 and ISO 15874 for long-term hydrostatic strength (10 MPa at 20°C).
Radiant Floor Heating
Produces PERT II pipes (16-25 mm) with oxygen barrier, complying with DIN 4726 and EN 1267 for thermal conductivity (0.4 W/m·K).
Chemical Transport Tubing
Processes PB pipes for industrial chemical transfer, resisting acids and alkalis per ASTM D1784 and ISO 15875.
Solar Plumbing Systems
Creates PPR-Al-PPR composite pipes for solar water heaters, with pressure rating PN20 (2.0 MPa) and temperature resistance up to 95°C.
Q: What is the maximum number of layers for co-extrusion?
A: It supports up to 5 layers (e.g., core + barrier + adhesive + color + protective layer) with layer thickness ratios adjustable from 5% to 60%.
Q: How does the system handle high-viscosity materials like PPR?
A: The high-torque gearbox (11 kW motor) and optimized screw geometry generate sufficient shear (200-500 s?1) to melt high-viscosity polymers without degradation.
Q: What maintenance is required for the twin-screw extruder?
A: Screws and barrels require inspection every 1,000 operating hours, with bearing lubrication (synthetic grease NLGI 2) every 500 hours and screen changer cleaning after 20 tons of material processed.
| Technical Specifications | Parameters |
| Core diameter | Ф2.5-25mm |
| Outer diameter after extrusion | Ф4.5-30mm |
| Designed speed | 6-150m/min |
| Equipment center Height | 1000mm |
| Payoff bobbin specification | PN1000-1600mm |
| Takeup bobbin specification | PN1000-1600mm |
| Screw Diameter | Ф65mm |
| L/D ratio | 25:1 |
| Screw rotation speed | 10-105r/min |
| Maximum output | 130kg/h (PvC) |
| Voltage Rating | 3-phase 5-wire, ~380V/50Hz |
Equipped with a φ65 mm twin-screw extruder (L/D ratio 36:1) with intermeshing screws, it achieves exceptional melt homogeneity (viscosity variation ≤3%) and output (100-300 kg/h) for thermoplastic polymers. Its multi-layer co-extrusion capability (up to 5 layers) enables complex insulation structures, while precision vacuum calibration (±0.1 mm tolerance) ensures dimensional stability across 0.5-8 mm cable diameters. Compliant with IEC 60228 and ASTM D2122, this line reduces scrap rates by 25% through advanced process control, making it ideal for high-performance insulation applications.
Extruder Performance: φ65 mm co-rotating twin-screw with 8 heating zones and kneading blocks, processing PPR (MFR 1.0-3.0 g/10min), PERT (density 0.92 g/cm3), PB (melting point 124°C), and PEX with cross-linking agents.
Material Handling: Supports 30% recycled content with dual-screen changer (60/120 mesh) and devolatilization port for moisture/volatile removal (vacuum 0.08 MPa).
Temperature Control: Electric heaters with water cooling (flow rate 10-20 L/min), maintaining barrel temperatures at 180-250°C (±1°C accuracy) via PID control.
Die Assembly: Spiral flow die with computer-optimized channel design for uniform material distribution, featuring quick-change inserts for diameter adjustments (5-50 mm).
Calibration System: Vacuum sizing tank (length 3-5 m) with multi-zone pressure control (0.02-0.08 MPa) and adjustable spray nozzles for even cooling.
Hauling Unit: Servo-driven caterpillar with precision-machined rollers (Ra ≤0.4 μm), providing traction force 5-50 kN and speed synchronization ±0.5% with extruder.
Automation Interface: Allen-Bradley Micro800 PLC with 10-inch HMI, offering real-time process visualization and data logging (1-year storage) for quality traceability.
Quality Control: Integrated laser micrometer (±0.005 mm accuracy) and melt flow meter that trigger alerts for thickness deviations >5% or pressure fluctuations >10%.
Plumbing Pipes
Manufactures PPR cold/hot water pipes (20-63 mm diameter), meeting GB/T 18742.2 and ISO 15874 for long-term hydrostatic strength (10 MPa at 20°C).
Radiant Floor Heating
Produces PERT II pipes (16-25 mm) with oxygen barrier, complying with DIN 4726 and EN 1267 for thermal conductivity (0.4 W/m·K).
Chemical Transport Tubing
Processes PB pipes for industrial chemical transfer, resisting acids and alkalis per ASTM D1784 and ISO 15875.
Solar Plumbing Systems
Creates PPR-Al-PPR composite pipes for solar water heaters, with pressure rating PN20 (2.0 MPa) and temperature resistance up to 95°C.
Q: What is the maximum number of layers for co-extrusion?
A: It supports up to 5 layers (e.g., core + barrier + adhesive + color + protective layer) with layer thickness ratios adjustable from 5% to 60%.
Q: How does the system handle high-viscosity materials like PPR?
A: The high-torque gearbox (11 kW motor) and optimized screw geometry generate sufficient shear (200-500 s?1) to melt high-viscosity polymers without degradation.
Q: What maintenance is required for the twin-screw extruder?
A: Screws and barrels require inspection every 1,000 operating hours, with bearing lubrication (synthetic grease NLGI 2) every 500 hours and screen changer cleaning after 20 tons of material processed.
| Technical Specifications | Parameters |
| Core diameter | Ф2.5-25mm |
| Outer diameter after extrusion | Ф4.5-30mm |
| Designed speed | 6-150m/min |
| Equipment center Height | 1000mm |
| Payoff bobbin specification | PN1000-1600mm |
| Takeup bobbin specification | PN1000-1600mm |
| Screw Diameter | Ф65mm |
| L/D ratio | 25:1 |
| Screw rotation speed | 10-105r/min |
| Maximum output | 130kg/h (PvC) |
| Voltage Rating | 3-phase 5-wire, ~380V/50Hz |
