Temperature control is one of the most important factors during DWC pipe production. Unstable temperature will cause many common defects, such as bad surface, uneven wall thickness, weak corrugation and pipe cracking.
For HDPE double wall corrugated pipe extrusion line, every heating zone from extruder barrel, die head to forming mould blocks needs accurate temperature setting. Proper temperature management helps manufacturers get stable pipe quality, reduce waste and improve production efficiency.
Recommended Temperature Reference for HDPE DWC Pipe Extrusion
| Extrusion Zone | Suggested Temperature Range | Main Function |
|---|---|---|
| Feeding Section (Barrel Zone 1) | 170‑180℃ | Pre‑heat raw material, avoid early melting and material blocking |
| Melting & Compression Section | 180‑200℃ | Fully melt HDPE pellets |
| Homogenizing Zone | 190‑210℃ | Make melt temperature even and stable |
| Co‑extrusion Die Head | 195‑210℃ | Ensure inner‑outer wall good bonding, smooth melt flow |
| Forming Mould Blocks | 50‑80℃ (water cooling) | Fix corrugation shape, prevent pipe sticking on moulds |
| Cooling Water | 20‑25℃ | Fast cooling, reduce inner stress of finished pipe |
Common Problems Caused by Wrong Temperature
- Temperature Too High Melt will become too thin. The corrugated shape is easy to collapse, material may degrade and pipe surface turns yellow.
- Temperature Too Low Raw material cannot be plasticized completely. You will get rough pipe surface, poor fusion between inner wall and outer wall, low ring stiffness.
- Uneven Temperature Between Zones It leads to unstable extrusion speed, wall‑thickness fluctuation and oval pipe shape.
Practical Temperature‑Control Tips for DWC Pipe Extrusion Line
- Adjust temperature step‑by‑step, do not change big temperature value in one operation.
- Keep temperature fluctuation within ±2‑3℃ for stable running.
- Match extrusion speed with temperature. Higher output usually needs suitable temperature increase.
- Check cooling water temperature regularly, hot cooling water will slow down shaping speed.
- If you produce large‑diameter DWC pipe, slightly raise die‑head temperature for better melt fluidity.
Precise temperature control greatly decides finished HDPE double wall corrugated pipe quality. Operators should master barrel, die and mould temperature parameters, monitor real‑time data and make timely adjustments.
Qingdao Confortune Machinery Co., Ltd. supplies complete high‑quality DWC pipe extrusion lines with reliable PLC temperature control system. Welcome to contact us for your corrugated pipe manufacturing project.
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