How to effective choice Extrusion Line of PVC-UH Pipe?

Choosing an extrusion line for PVC-UH pipes (unplasticized high-performance PVC) requires careful consideration of various technical, economic, and operational factors. Here’s a step-by-step guide to making an effective choice:

1. Define Pipe Specifications

Pipe Diameter & Wall Thickness: Ensure the extrusion line supports the required range.

Pressure Rating: PVC-UH pipes are commonly used for high-pressure applications; confirm that the system meets these demands.

Standard Compliance: Check compatibility with ISO 6993, EN 17176, or local standards.

2. Consider Machine Components

A high-performance extrusion line includes:

Extruder:

Choose a high-torque twin-screw extruder for better material processing.

L/D ratio (Length/Diameter): 22:1 to 26:1 for optimized melting and homogenization.

Output Capacity: Ranges from 250 kg/h to 1200 kg/h, depending on pipe size.

Die Head & Calibration System:

Spiral die heads ensure uniform melt flow and high output.

Vacuum calibration tank: Needed for pipe dimensional accuracy and roundness.

Consider multi-layer die heads if using co-extrusion.

Cooling & Haul-off Units:

Water cooling tanks (multiple stages) for efficient heat dissipation.

Belt-type or caterpillar haul-off units for steady pipe pulling without deformation.

Cutting & Stacking:

Planetary saw or chipless cutting unit for smooth, precise cuts.

Automated pipe stacking for production efficiency.

3. Material Compatibility

Ensure the machine can process PVC-UH formulations with additives (e.g., stabilizers, lubricants, processing aids).

Verify compatibility with bimodal PVC or enhanced formulations.

4. Energy Efficiency & Automation

Servo motors in haul-off and cutting systems reduce power consumption.

PLC-based control systems for monitoring and automation.

Gravimetric dosing systems for accurate raw material feeding.

5. Manufacturer & Support

Choose a reliable supplier with experience in PVC-UH extrusion (e.g., KraussMaffei, Battenfeld-Cincinnati, Jinhu, etc.).

Check after-sales service, spare parts availability, and training support.

6. Cost & ROI Analysis

Balance between initial investment and production efficiency.

Calculate cost per kg of production and compare with market pricing.

7. Additional Features for Quality Control

Online wall thickness measurement systems.

Automatic laser marking systems for pipe branding and certification.

Conclusion,To choose the most effective extrusion line, align the machine specifications with pipe requirements, material properties, energy efficiency, and automation level. Partnering with a reputable manufacturer ensures long-term performance and ROI.