PVC Pipe Extrusion Line

The SUHUI PVC pipe extrusion line is a fully automated manufacturing system designed for producing rigid PVC pipes used in water supply, drainage, sewage, irrigation, electrical conduit, and industrial pipeline applications. The line combines twin-screw extrusion technology with precision vacuum calibration and multi-stage cooling to ensure consistent wall thickness, dimensional accuracy, and smooth inner and outer surfaces.

Supporting pipe diameters from Φ16 mm to Φ800 mm across single, dual, and four-cavity die configurations, the SUHUI PVC pipe line covers the full range from small-diameter conduit to large-diameter drainage and sewage pipes. All configurations comply with international standards including ISO 4422, EN 1401, and ASTM D1785.

The system’s twin-screw extruder (SJZ series) provides superior PVC plasticizing performance, while the modular line design supports recycled PVC content integration and quick die changeover for different pipe specifications.

Key Features of SUHUI PVC Pipe Extrusion Line

• Conical Twin-Screw Extruder (SJZ Series): Purpose-built for PVC processing, the conical twin-screw design provides excellent plasticizing, homogenization, and output stability without thermal degradation.
• Multi-Cavity Die Configurations: Supports single, dual, and four-cavity die heads for simultaneous production of multiple pipes, significantly increasing output per line.
• High-Precision Vacuum Calibration: Vacuum calibration sleeves fix outer diameter and wall thickness immediately after the die, ensuring consistent pipe geometry across all sizes.
• Multi-Stage Water Cooling: Spray or immersion cooling tanks rapidly solidify the pipe and prevent dimensional variation, warping, or internal stress.
• Servo-Driven Haul-Off: Caterpillar puller with servo motor control maintains precise, consistent pulling force to ensure uniform wall thickness throughout production.
• Automatic Cutting System: Planetary saw or guillotine cutter precisely cuts pipes to the specified length without stopping line production.
• HMI Touchscreen Control: Full line monitoring and parameter adjustment via PLC-based HMI, with recipe storage for fast product changeover.
• Energy-Efficient Heating Zones: Insulated barrel and die heating with optimized energy recovery reduce power consumption during continuous operation.
• Recycled PVC Compatible: Compatible with recycled PVC content blending for cost-effective and environmentally responsible production.

Technical Data – PVC Pipe Extrusion Line

PVC Pipe Extrusion Process Workflow

1. Material Mixing: PVC resin is blended with stabilizers, lubricants, impact modifiers, and fillers in a high speed mixer to produce a homogeneous dry blend compound ready for extrusion.
2. Feeding: The PVC compound is fed into the conical twin-screw extruder hopper via an automated feeding system for consistent, controlled material flow.
3. Extrusion & Die Forming: The twin-screw extruder melts and homogenizes the PVC compound under precisely controlled multi-zone temperature settings, then forces the melt through the pipe die head to form a continuous pipe profile.
4. Vacuum Calibration: The freshly extruded pipe enters a vacuum calibration sleeve that applies negative pressure to hold the pipe against the sizing tool, fixing the outer diameter and wall uniformity.
5. Cooling: The calibrated pipe passes through a series of water spray or immersion cooling tanks to fully solidify the material and eliminate internal stress.
6. Haul-Off: A servo-driven caterpillar haul-off unit grips and pulls the pipe through the line at a precise, consistent speed to maintain wall thickness uniformity.
7. Cutting: An automatic planetary saw or guillotine cutter, triggered by a length encoder, cuts pipes to the specified length with clean, burr-free ends.
8. Inspection & Packaging: Finished PVC pipes are checked for diameter, wall thickness, and surface quality, then stacked, bundled, or stored for shipment.