0102030405
Why Does Melt Pressure Fluctuate in Plastic Extrusion?
2026-07-17
Why Does Melt Pressure Fluctuate in Plastic Extrusion?
Introduction
Melt pressure fluctuation is a critical issue in extrusion production. It directly affects product quality, especially in pipe and blow molding applications.
1. Causes of Pressure Fluctuation
1.1 Feeding Instability
Irregular material feeding causes immediate pressure changes.
1.2 Screw Design Issues
Poor geometry leads to uneven compression and unstable melting.
1.3 Temperature Variation
Viscosity changes cause pressure instability.
2. System Interaction Effect
Pressure fluctuation is not caused by one factor. It is the result of:
- Feeding system
- Screw design
- Temperature control
- Material consistency
3. Solutions
- Optimize screw geometry
- Improve feeding consistency
- Stabilize heating zones
- Reduce shear fluctuation
Conclusion
Stable melt pressure is the foundation of stable production.