What‘s advantage of the Bulk Spiral Die-head ？

The Bulk Spiral Die-head is a key component in plastic pipe extrusion lines, especially for producing large-diameter or thick-wall pipes like HDPE, PVC-UH, or structured wall pipes. Its advantages include:

✅ 1. Uniform Melt Distribution (Spiral Flow Channel Design)

· The spiral structure ensures even distribution of polymer melt across the die circumference.

· Minimizes weld lines and wall thickness variation — critical for high-strength, pressure-resistant pipes.

✅ 2. High Output & Pressure Capacity

· Bulk spiral die-heads are designed for large volume throughput, supporting high extrusion speeds while maintaining melt homogeneity.

· Supports high back-pressure, ideal for large-diameter or multilayer pipes.

✅ 3. Reduced Internal Stress

· The even flow reduces molecular orientation differences and cooling shrinkage, leading to low internal stress in the final pipe.

· Improves long-term mechanical strength and durability of the pipe.

✅ 4. Adaptable for Multi-layer Co-extrusion

· Many bulk spiral dies support multi-layer construction, allowing you to produce 2-layer or 3-layer pipes with different materials (e.g., recycled core, virgin outer).

✅ 5. Easy Maintenance and Cleaning

· Modular die-head design allows for quick dismantling and reassembly.

· Smooth channels reduce the risk of polymer stagnation or degradation.

✅ 6. Suitable for a Wide Range of Materials

· Compatible with HDPE, PP, PVC-UH, PE-RT, and more.

· Can handle fillers and recyclates due to its robust flow dynamics.

✅ 7. Scalability & Customization

· Available in custom sizes from small-scale pipes (50mm) up to very large diameters (1600mm+).

· Easily tailored to specific pipe wall structures and production speeds.