Plastic Pipe Extrusion Line
Introduction
Plastic pipe extrusion is a continuous, high-volume process that converts thermoplastic pellets or powder into finished pipes with precise dimensions, smooth surfaces and controlled mechanical properties. A modern extrusion line is an integrated system of machines, controls and auxiliaries designed for round-the-clock operation, quick product change-over and minimal waste.
Core Components of the Line
2.1 Material Handling & Drying
• Vacuum loaders, hopper dryers or crystallizers (for PET) ensure moisture levels <0.02 % to avoid hydrolytic degradation.
• Gravimetric blenders dose virgin resin, regrind, masterbatch and additives to ±0.1 % accuracy.
2.2 Single-Screw or Twin-Screw Extruder
• Barrier or grooved-feed single-screw extruders (L/D 30–38:1) dominate PE, PP and PVC-U applications.
• Counter-rotating conical twin-screw machines (L/D 22–26:1) are preferred for rigid PVC thanks to lower shear and excellent melt homogeneity.
• Key parameters:
– Screw speed: 20–120 rpm (servo-driven, energy recovery)
– Specific output: 10–25 kg/h per kW for HDPE
– Melt temperature window: 180–220 °C (PE), 165–195 °C (PVC)
– AC permanent-magnet motors + direct-drive gearboxes cut energy use by 8–12 % versus traditional designs.
2.3 Screen Changer & Melt Pump
• Continuous, hydraulically-sliding plate screen changers allow filter swaps without line shutdown.
• Gear pumps (up to 350 bar) stabilize melt pressure, reducing thickness variation to <±1 %.
2.4 Die Head & Calibrator
• Spiral or basket dies for diameters 16–1600 mm.
• Multi-layer co-ex heads (2-, 3- or 5-layer) produce pipes with barrier (EVOH), adhesion tie-layers or recycled cores.
• Calibrating sleeves, vacuum tanks and spray cooling chambers secure roundness and diameter tolerances to ISO 11922-1 Class B or tighter on request.
2.5 Cooling & Haul-Off
• Vacuum sizing tanks (2–6 m) with closed-loop water temperature control (±1 °C).
• Caterpillar or belt haul-offs with dual servo drives maintain haul-off accuracy within ±0.1 %.
• Flying knife or planetary saw cutters slice pipes at line speed without stopping.
2.6 Take-Off & Automation
• Pipe belling machines (socket forming) for PVC sewer pipes.
• Automatic coilers for PE drip irrigation tubes (coil OD up to 2 m).
• Laser marking or inkjet printers apply traceability codes; vision systems detect surface defects in real time.
Typical Pipe Specifications Produced
| Material | Size Range | Standard | Application |
|---|
| HDPE | 16–1600 mm | ISO 4427, ASTM F714 | Water & gas distribution |
| PP-R | 20–160 mm | ISO 15874 | Hot & cold plumbing |
| PVC-U | 50–630 mm | ISO 1452, ASTM D1785 | Drainage, conduit |
| PE-RT | 16–32 mm | ISO 22391 | Under-floor heating |
| Double-wall corrugated PE | 200–1200 mm | EN 13476 | Storm-water drains |
Capacity & Power Consumption (Reference Values)
| Line Model | Pipe Range | Output (kg/h) | Installed Power (kW) | Footprint (m²) |
|---|
| PE-63 | 16–63 mm | 250–350 | 110 | 120 |
| PE-250 | 75–250 mm | 550–750 | 220 | 200 |
| PE-630 | 315–630 mm | 1000–1200 | 400 | 350 |
| PVC-250 | 110–250 mm | 350–450 | 180 | 180 |
Quality & Sustainability Features
• Gravimetric extrusion control (GEC) links haul-off speed to melt pressure, saving 2–4 % resin.
• Closed-loop water circuits and energy-efficient servo motors lower CO₂ footprint by up to 30 %.
• Inline ultrasonic wall-thickness gauges ensure compliance with ISO 9001 factory audits.
After-Sales & Digitalization
• Remote VPN access for diagnostics, recipe download and OEE dashboards.
• Cloud-based predictive maintenance alerts for gearbox vibration and heater wear.
• On-site training covering start-up, troubleshooting and die cleaning procedures.
+86-18561886575 (Mr.Wu) 
+8618561886575
238 Yangzhou West Road, Jiaozhou City, Qingdao City, Shandong Province