The SJN-70 High Speed Extruding Line for Building/Automotive Wires is a versatile production system engineered for dual applications in building wire insulation and automotive cable sheathing.
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Powered by a φ70 mm single-screw extruder (L/D ratio 25:1) with self-cleaning intermeshing screws, it achieves superior melt homogeneity (viscosity variation ≤5%) and high output (150-400 kg/h) for thermoplastic polymers. Its multi-layer co-extrusion capability (up to 3 layers) enables simultaneous processing of insulation and jacket materials, while precision vacuum calibration (±0.1 mm diameter tolerance) ensures dimensional stability. Compliant with IEC 60228 and ISO 6722, this line reduces changeover time by 30% via modular tooling, making it ideal for small-batch customization and large-scale production.
Extruder Design: φ70 mm co-rotating single-screw with 6 heating zones, featuring kneading blocks and mixing elements for uniform dispersion of additives (e.g., flame retardants, UV stabilizers).
Material Compatibility: Processes PPR-C (MFR 0.5-2.0 g/10min), PERT II (density 0.92 g/cm3), PB-1 (melting point 124°C), and PEX-a with cross-linking agents.
Temperature Control: Electric resistance heaters with water cooling jackets (flow rate 5-15 L/min), maintaining barrel temperatures at 180-250°C (±1°C accuracy).
Die System: Spiral mandrel die with flow distribution channels (Ra ≤0.4 μm), supporting layer ratios from 10:90 to 50:50 for co-extruded products.
Calibration Unit: Vacuum calibration tank (length 3-6 m) with multi-zone vacuum control (0.02-0.08 MPa) and adjustable cooling water flow (10-30 m3/h).
Hauling System: Servo-driven caterpillar haul-off with urethane rollers (Shore A 85), providing traction force from 10-50 kN and speed synchronization ±0.5%.
PLC+HMI Interface: 12-inch touchscreen with 3D process visualization, storing 100+ production recipes with parameters for material type, line speed, and layer thickness.
Quality Monitoring: Integrated laser diameter gauge (±0.01 mm accuracy) and wall thickness scanner that trigger automatic adjustments if deviations exceed 5%.
Building Electrical Wiring
Manufactures PVC-insulated building wires (0.75-16 mm2) for residential/commercial use, meeting IEC 60227 and UL 44 for flame retardancy (FT1 rating).
Underfloor Heating Pipes
Produces PERT II pipes (16-32 mm diameter) with oxygen barrier layers, complying with DIN 4726 and ASTM F2389 for long-term hydrostatic strength (10 MPa at 20°C).
Automotive Cable Harnesses
Processes multi-core automotive cables with PE insulation and PVC jacket, resisting engine oil and coolant per ISO 6722-1 Class A (125°C).
Solar Thermal Systems
Creates PPR-Al-PPR composite pipes for solar water heaters, with thermal conductivity ≤0.4 W/m·K and pressure rating PN16 (1.6 MPa).
Q: What is the maximum line speed for multi-layer extrusion?
A: For 3-layer pipes (20 mm diameter), maximum speed is 80 m/min, with automatic speed reduction if melt pressure exceeds 15 MPa.
Q: How is the self-cleaning function achieved in the single-screw extruder?
A: The intermeshing screw profile (45° helix angle) creates positive displacement that wipes 95% of material from screw surfaces, reducing cleaning time between material changes by 60%.
Q: Can it produce color-striped insulation for phase identification?
A: Yes, the optional color stripe unit (1-3 colors) with gear pump dosing (±1% accuracy) enables continuous stripe application (width 1-3 mm).
| Technical Specifications | Parameters |
| Designed speed (maximum) | 300m/min |
| Equipment center Height | 1000mm |
| Payoff bobbin specification | PN500~PN800 |
| Takeup bobbin specification | PN500~PN800 |
| Screw Diameter | Ф80mm |
| L/D ratio | 25:1 |
| Maximum screw rotation speed | 90r/min |
| Motor power | 75kW |
| Maximum output | 300kg/h 5%(SPVC);: 200~350 kg/h (LSZH, normal C grade ) |
| Horizontal accumulator amount | 200m (with 300~500mm accumulator wheel) |
| Voltage Rating | 3-phase 5-wire, ~380V/50Hz |
Powered by a φ70 mm single-screw extruder (L/D ratio 25:1) with self-cleaning intermeshing screws, it achieves superior melt homogeneity (viscosity variation ≤5%) and high output (150-400 kg/h) for thermoplastic polymers. Its multi-layer co-extrusion capability (up to 3 layers) enables simultaneous processing of insulation and jacket materials, while precision vacuum calibration (±0.1 mm diameter tolerance) ensures dimensional stability. Compliant with IEC 60228 and ISO 6722, this line reduces changeover time by 30% via modular tooling, making it ideal for small-batch customization and large-scale production.
Extruder Design: φ70 mm co-rotating single-screw with 6 heating zones, featuring kneading blocks and mixing elements for uniform dispersion of additives (e.g., flame retardants, UV stabilizers).
Material Compatibility: Processes PPR-C (MFR 0.5-2.0 g/10min), PERT II (density 0.92 g/cm3), PB-1 (melting point 124°C), and PEX-a with cross-linking agents.
Temperature Control: Electric resistance heaters with water cooling jackets (flow rate 5-15 L/min), maintaining barrel temperatures at 180-250°C (±1°C accuracy).
Die System: Spiral mandrel die with flow distribution channels (Ra ≤0.4 μm), supporting layer ratios from 10:90 to 50:50 for co-extruded products.
Calibration Unit: Vacuum calibration tank (length 3-6 m) with multi-zone vacuum control (0.02-0.08 MPa) and adjustable cooling water flow (10-30 m3/h).
Hauling System: Servo-driven caterpillar haul-off with urethane rollers (Shore A 85), providing traction force from 10-50 kN and speed synchronization ±0.5%.
PLC+HMI Interface: 12-inch touchscreen with 3D process visualization, storing 100+ production recipes with parameters for material type, line speed, and layer thickness.
Quality Monitoring: Integrated laser diameter gauge (±0.01 mm accuracy) and wall thickness scanner that trigger automatic adjustments if deviations exceed 5%.
Building Electrical Wiring
Manufactures PVC-insulated building wires (0.75-16 mm2) for residential/commercial use, meeting IEC 60227 and UL 44 for flame retardancy (FT1 rating).
Underfloor Heating Pipes
Produces PERT II pipes (16-32 mm diameter) with oxygen barrier layers, complying with DIN 4726 and ASTM F2389 for long-term hydrostatic strength (10 MPa at 20°C).
Automotive Cable Harnesses
Processes multi-core automotive cables with PE insulation and PVC jacket, resisting engine oil and coolant per ISO 6722-1 Class A (125°C).
Solar Thermal Systems
Creates PPR-Al-PPR composite pipes for solar water heaters, with thermal conductivity ≤0.4 W/m·K and pressure rating PN16 (1.6 MPa).
Q: What is the maximum line speed for multi-layer extrusion?
A: For 3-layer pipes (20 mm diameter), maximum speed is 80 m/min, with automatic speed reduction if melt pressure exceeds 15 MPa.
Q: How is the self-cleaning function achieved in the single-screw extruder?
A: The intermeshing screw profile (45° helix angle) creates positive displacement that wipes 95% of material from screw surfaces, reducing cleaning time between material changes by 60%.
Q: Can it produce color-striped insulation for phase identification?
A: Yes, the optional color stripe unit (1-3 colors) with gear pump dosing (±1% accuracy) enables continuous stripe application (width 1-3 mm).
| Technical Specifications | Parameters |
| Designed speed (maximum) | 300m/min |
| Equipment center Height | 1000mm |
| Payoff bobbin specification | PN500~PN800 |
| Takeup bobbin specification | PN500~PN800 |
| Screw Diameter | Ф80mm |
| L/D ratio | 25:1 |
| Maximum screw rotation speed | 90r/min |
| Motor power | 75kW |
| Maximum output | 300kg/h 5%(SPVC);: 200~350 kg/h (LSZH, normal C grade ) |
| Horizontal accumulator amount | 200m (with 300~500mm accumulator wheel) |
| Voltage Rating | 3-phase 5-wire, ~380V/50Hz |
