How to Reduce Scrap Rate in Blow Molding Production
Introduction
Scrap rate is a key cost factor in blow molding production. High scrap levels reduce efficiency and increase material waste.
---1. Improve Melt Stability
Stable melt pressure ensures consistent parison formation.
---2. Optimize Screw L/D Ratio
| Application | L/D Ratio |
|---|---|
| HDPE Bottles | 25:1–30:1 |
| Containers | 24:1–28:1 |
3. Control Temperature Fluctuation
Temperature variation directly affects melt viscosity and stability.
---4. Use Advanced Screw Structures
Barrier screws improve melt uniformity and reduce defects.
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---FAQ
What causes scrap in blow molding?
Unstable melt flow and temperature fluctuations.
---Conclusion
Reducing scrap requires both equipment optimization and process control.