Why Does Screw Wear Increase in High-Filler Applications?
Introduction
In plastic extrusion and compounding processes, high-filler materials such as calcium carbonate, talc, and glass fiber are widely used to reduce cost and improve mechanical properties.
However, these materials significantly accelerate screw and barrel wear, leading to increased maintenance costs and production downtime.
---1. Abrasive Nature of Fillers
Fillers are inherently abrasive. During extrusion, these particles continuously rub against the screw surface, gradually removing material.
For example, calcium carbonate with high hardness can cause noticeable wear within a few months in high-output lines.
---2. Effect of Filler Percentage
| Filler Content | Wear Rate | Impact |
|---|---|---|
| Below 20% | Low | Normal lifespan |
| 20%–50% | Medium | Accelerated wear |
| Above 50% | High | Frequent replacement |
3. High Shear and Compression Effects
Higher compression ratios increase shear stress, which intensifies friction between filler particles and metal surfaces.
Compression ratios above 3.5:1 should be carefully evaluated in high-filler applications.
---4. Material Selection for Wear Resistance
- Bimetallic barrels
- Nitrided screws
- Carbide coatings
Choosing the right material can extend service life by 2–3 times.
Explore durable solutions at Jinteng screw barrel systems.
---5. Design Optimization Strategies
- Reduce compression ratio
- Use optimized flight geometry
- Control screw speed
FAQ
Why do fillers cause screw wear?
Abrasive particles continuously erode the screw surface.
How to reduce wear in high-filler extrusion?
Use wear-resistant materials and optimize screw design.
---Conclusion
High-filler applications require careful material selection and design optimization to reduce wear and improve production efficiency.