The screw and barrel are the core of any injection molding machine. Over time, plastic residue, carbon buildup, and degraded polymers can accumulate inside the plasticizing unit. That’s why regular injection molding screw and barrel cleaning is critical to maintaining production quality, minimizing downtime, and extending equipment lifespan.
🧪 Why Cleaning Is Essential
If not cleaned properly, your screw and barrel may suffer from:
- Black specks and discoloration in molded parts
- Poor plasticizing and melt inconsistency
- Material contamination during color or resin change
- Increased wear and corrosion
According to Plastics Technology, improper cleaning methods can damage expensive components and lead to longer downtimes.
🔁 When to Clean Your Screw and Barrel
You should consider cleaning:
- During color changes
- When switching between resin types (e.g. ABS → POM or PC → PA)
- After long shutdowns or machine idle time
- If product defects (burn marks, black dots) appear
- Before maintenance or part replacement
🧰 How to Clean: 3 Recommended Methods
1. Manual Cleaning (Disassembly Required)
- Remove screw and barrel
- Use brass or copper brushes, not steel
- Heat parts (around 180–200°C) to soften plastic residue
- Avoid scratching or grinding the screw surface
✅ Pros: Deep clean
❌ Cons: Time-consuming, requires trained operators
2. Purging Compounds (No Disassembly)
- Run commercial purging compound through the barrel at normal processing temperature
- Types: Mechanical purges (glass-filled), chemical purges (decomposing additives)
- Examples: Asaclean, Dyna-Purge, Lusin Clean
✅ Pros: Fast, safe, effective for color/resin changes
❌ Cons: Additional material cost
According to Asaclean, proper purging can reduce downtime by up to 80% compared to manual methods.
3. Using Virgin Resin + Cleaning Additives
- Use PE, PP or PS with 10–20% abrasive material
- Not as effective as commercial purges, but cost-efficient
✅ Pros: Low cost
❌ Cons: Less effective for deep or chemical cleaning
⚠️ Cleaning Tips to Avoid Damage
- Never use metal scrapers or steel brushes
- Avoid overheating (>350°C) to prevent barrel oxidation or screw distortion
- Don’t force solid plastic through a cold machine—wait for full plasticization
- For bimetallic barrels, ensure cleaning agents won’t corrode the alloy lining
For material-specific screw designs, visit our Injection Screw Barrel Types.
🏭 Common Machines Supported
We supply screw and barrel cleaning knowledge—and replacement parts—for machines such as:
- Haitian
- Engel
- Arburg
- Chen Hsong
- KraussMaffei
- JSW and Sumitomo Demag
Whether you’re using engineering plastics like PA66-GF, or transparent resins like PMMA, proper cleaning ensures machine health and product consistency.
🔗 Internal Link Suggestions
- Injection Screw and Barrel Maintenance
- How to Replace an Injection Screw
- Screw Barrel Types for Different Resins
🌐 Authoritative External Resources
📞 Need Help with Cleaning or Replacing Your Screw and Barrel?
Regular cleaning improves production quality, reduces downtime, and extends equipment life. If your screw and barrel are worn or damaged, it may be time for a replacement.
Contact Zhoushan Juyuan Machinery Co., Ltd.
📧 Email: cxj.job@gmail.com
🌐 Website: https://juyuan-machinery.com
📱 WhatsApp: +86 13905808474
We supply high-precision injection molding screws and barrels tailored to your machine and plastic material. Worldwide shipping available.