Processing PET (Polyethylene Terephthalate) requires more than just a standard extruder setup — it demands a specially designed single screw extruder barrel optimized for high-temperature stability, moisture sensitivity, and shear control. In this blog, we’ll explore how to select the right screw barrel for PET and what makes it different from processing other polymers.
Why PET Requires a Specialized Extruder Barrel
PET is widely used in producing sheets, films, and packaging materials. However, it has a low viscosity and is highly sensitive to moisture, which means traditional screw barrels can struggle with:
- Hydrolysis at high temperatures
- Inconsistent melting or yellowing
- Poor mechanical properties due to degradation
According to Plastics Technology, PET must be processed at 250–280°C and under very low moisture conditions (<50 ppm) to avoid degradation and maintain product clarity.
Key Features of a PET-Ready Single Screw Extruder Barrel
To handle PET efficiently, your single screw extruder barrel should have:
✅ High-Temperature Resistance
The barrel and screw must withstand processing temperatures up to 300°C. Bimetallic barrels with nickel-based alloys are recommended.
✅ Venting Zones or Degassing Sections
PET must be dried or dehumidified during extrusion. Vented screw designs and vent ports in the barrel help remove residual moisture and prevent hydrolysis.
✅ Low Shear Geometry
PET is shear-sensitive. A properly designed screw with a gentle compression ratio and smooth barrel bore reduces material degradation.
✅ Accurate Temperature Control
Integrated heater bands and cooling fans across barrel zones are critical to avoid overheating.
A study published by SPE International showed that optimized PET screw barrel designs reduced IV (Intrinsic Viscosity) loss by up to 40%, improving downstream product strength and clarity.
Compatible with Leading Extrusion Brands
Top machinery brands offering PET-compatible single screw extruders include:
- Battenfeld-Cincinnati
- Reifenhäuser
- Davis-Standard
- Liansu (for China-based lines)
At Zhoushan Juyuan Machinery Co., Ltd., we design and manufacture custom single screw barrels tailored for PET extrusion lines — whether you are using imported machines or local Chinese models.
What Materials Are Used in PET Extruder Barrels?
| Material Type | Features | Use in PET |
|---|---|---|
| Nitrided Steel | Economical, good hardness | ⚠️ Not ideal for high-temp PET |
| Bimetallic (Fe-based) | Wear-resistant, better heat control | ✅ Suitable |
| Nickel Alloy (Ni-based) | High corrosion & heat resistance | ✅ Best for PET |
See our product page for PET barrel customization:
👉 Custom Screw Barrel Manufacturer – PET Applications
Pricing and Lead Time
PET-specific screw barrels are custom-engineered and may be priced slightly higher due to material and design complexity. However, the investment is returned through:
- Lower scrap rates
- Higher line efficiency
- Better product quality
Lead times typically range from 15–25 days, depending on size and complexity.
Contact Us for PET Extrusion Solutions
📧 Email: cxj.job@gmail.com
📞 WhatsApp: +86 13905808474
🌍 Website: https://juyuan-machinery.com
Whether you’re upgrading an existing line or starting a new PET project, our team will provide you with reliable, precision-engineered single screw extruder barrels for PET — built to perform and built to last.