Processing Machinery
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PVA internal unmelted particles
Problem Phenomenon
PVA product interior shows unmelted transparent or translucent particles
Cause Analysis
Screw plasticizing capacity insufficient, temperature on the low side; feeding amount too large exceeding the plasticizing capacity; PVA melting temperature on the high side
Solution
1) Raise processing temperature to ensure full melting; 2) Reduce feeding amount to match the plasticizing capacity; 3) Increase screw mixing section
Key Takeaway
Unmelted particles are caused by insufficient plasticizing; raising temperature and reducing feeding are the key
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