Processing Machinery
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Internal unmelted particles of PU
Problem Phenomenon
Unmelted transparent or translucent particles appear inside PU products
Cause Analysis
Screw plasticizing capacity insufficient, temperature too low; feed amount too large, exceeding plasticizing capacity; PU melting temperature too high
Solution
1) Increase processing temperature to ensure full melting; 2) Reduce feed amount to match plasticizing capacity; 3) Increase screw mixing section
Key Takeaway
Unmelted particles are caused by insufficient plasticizing; increasing temperature and reducing feeding are key
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