When to Choose a Bulk Spiral Die-head？

Choosing a Bulk Spiral Die-head is a strategic decision based on the type of pipe, output requirements, and quality expectations. Here's when you should choose a Bulk Spiral Die-head:

✅ When to Choose a Bulk Spiral Die-head

1. Producing Large-Diameter Pipes

Ideal for HDPE/PE/PP pipes with diameters from 160 mm to 2000+ mm.

Ensures even melt flow distribution across the large cross-section.

2. High Output Requirements

Required when your line targets >800–2000 kg/h output.

Spiral flow channels reduce melt resistance, enabling stable high-speed extrusion.

3. Need for Wall Thickness Uniformity

Spiral die-heads offer excellent concentricity, reducing variation in pipe wall.

Crucial for pressure pipes or structural pipes (e.g., SN8-SN16).

4. Multi-layer Co-Extrusion

Ideal for 2–5 layer pipes (e.g., outer wear-resistant layer, inner smooth layer).

Spiral distribution supports uniform layering without dead zones.

5. Low Melt Memory & Weld Lines

Spiral flow paths minimize weld lines, which improves mechanical strength.

Reduces internal stress and weak spots in thick-walled pipes.

6. Used for Structured Wall Pipe or Krah Pipe

Bulk spiral die-heads are used in profiled wall pipe (e.g., Krah or Belling systems).

Helps in producing lightweight but high-stiffness pipes.

7. Need for Stable Melt Pressure and Flow

Especially important in long-run continuous production where pressure fluctuation must be minimized.