PVC Pipe Extrusion Line

The SUHUI PVC pipe extrusion line is a fully automated manufacturing system designed for producing rigid PVC and UPVC pipes used in water supply, drainage, sewage, irrigation, electrical conduit, air conditioning condensate water systems, 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. An optional integrated belling machine enables inline socket forming for pressure pipe production.

Key Features of SUHUI PVC Pipe Extrusion Line

• Conical Twin-Screw Extruder (SJZ Series): Purpose-built for PVC processing with bimetallic screw and barrel for extended wear resistance, ceramic heater zones for precise temperature control, SKF thrust bearings, inner oil cooling circuit, and gearbox cooling system for continuous stable operation.
• European Design Die Fast-Locking Unit: Quick-release die head locking mechanism reduces changeover time when switching between pipe specifications — critical for facilities running multiple pipe sizes.
• 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. Multi-caterpillar configuration available for wide speed range requirements.
• Planetary Cutter with ABB Inverter Control: Servo-driven planetary saw with ABB inverter and 30-step speed exchange capability precisely cuts pipes to specified length without stopping line production, producing clean burr-free ends.
• Integrated Belling Machine (Optional): Inline belling machine with Siemens PLC and ABB inverter support for U, R, and Z-shape socket molds — enables continuous online bell-end forming for pressure pipe production without a separate offline process.
• HMI Touchscreen Control: Full line monitoring and parameter adjustment via PLC-based HMI, with recipe storage for fast product changeover.
• Recycled PVC Compatible: Compatible with recycled PVC regrind or pellet blending for cost-effective and environmentally responsible production.
• Certified to International Standards: CE, ISO9001:2008, QS, and GMP certified. Machine warranty: 13 months.

Technical Data – PVC Pipe Extrusion Line

Configuration, die, and downstream equipment are matched to your specific pipe diameter range, output requirement, and product standard. Contact SUHUI for a complete line proposal.

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 a high-capacity automated dosing feeder for consistent, controlled material flow.
3. Extrusion & Die Forming: The twin-screw extruder melts and homogenizes the PVC compound under precisely controlled multi-zone ceramic heating, then forces the melt through the fast-locking 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 cutter with ABB inverter control, triggered by a length encoder, cuts pipes to the specified length with clean, burr-free ends without stopping the line.
8. Belling (Optional): For socket pipe production, an integrated online belling machine with Siemens PLC and U/R/Z-shape mold options forms the bell end of each pipe immediately after cutting, without an offline secondary operation.
9. Inspection & Packaging: Finished PVC pipes are checked for diameter, wall thickness, and surface quality, then stacked, bundled, or stored for shipment.

Frequently Asked Questions

What pipe diameters and configurations does the SUHUI PVC pipe extrusion line support?

The SUHUI PVC pipe extrusion line supports outer diameters from Φ16 mm to Φ800 mm. It is available in single, dual, and four-cavity die configurations — the dual and four-cavity configurations extrude multiple pipes simultaneously for significantly higher output per line. Each model uses a matched SJZ conical twin-screw extruder and tooling configuration optimized for its specific diameter range and output requirement.

Why is a conical twin-screw extruder used for PVC pipe extrusion?

PVC is a thermally sensitive material that requires controlled, uniform plasticizing to prevent degradation. The conical twin-screw design provides high shear and distributive mixing in the feed zone (larger diameter screws) while reducing shear stress at the die (smaller diameter screws), protecting the PVC compound from overheating. The bimetallic screw and barrel provide superior wear resistance, while ceramic heater zones and the inner oil cooling circuit ensure precise, stable temperature control across all production runs.

What international standards do PVC pipes from this line comply with?

PVC pipes produced on the SUHUI extrusion line comply with ISO 4422 (unplasticized polyvinyl chloride pipes for water supply), EN 1401 (PVC-U pipes for underground drainage and sewage), and ASTM D1785 (standard specification for PVC plastic pipe, schedules 40, 80, and 120). The precision vacuum calibration and online dimensional monitoring systems ensure consistent compliance with the dimensional tolerances and wall thickness specifications required by these standards. The machine itself is certified CE, ISO9001:2008, QS, and GMP.

Can the line use recycled PVC material?

Yes. The SUHUI PVC pipe extrusion line is compatible with recycled PVC regrind or pellets as a proportion of the total compound. Recycled content is blended with virgin PVC resin, stabilizers, and additives in a high speed mixer before extrusion. The proportion of recycled content varies by application — non-pressure drainage pipes typically tolerate higher recycled content than pressure-rated water supply pipes. SUHUI engineers can advise on formulation guidelines for specific recycled content targets and pipe applications.

How does the vacuum calibration system ensure consistent PVC pipe dimensions?

After exiting the die, the extruded PVC pipe immediately enters a vacuum calibration sleeve where negative pressure holds the pipe wall against the precision-machined sizing bore. This fixes the outer diameter and ensures round, uniform cross-section before the material fully solidifies. Simultaneous water cooling at the calibration stage rapidly sets the outer pipe wall. The pipe then passes through multi-stage spray or immersion cooling tanks that progressively reduce temperature and relieve internal stress, stabilizing the final dimensions.

What cutting systems are available for PVC pipe production?

The SUHUI PVC pipe extrusion line uses a servo-driven planetary saw cutter with ABB inverter control and 30-step speed exchange capability. An automatic length encoder triggers the cutting cycle to produce pipes at the specified length without manual measurement or stopping the haul-off. The planetary saw delivers clean, burr-free cuts across all PVC pipe sizes. For socket pipe production, an optional integrated belling machine with Siemens PLC and U/R/Z-shape mold support is available for inline bell-end forming.