Material Drying
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Severe moisture absorption of PVA raw material before extrusion
Problem Phenomenon
PVA raw material moisture absorption >5%, cannot be extruded and processed normally
Cause Analysis
PVA polar groups are extremely hydrophilic and rapidly absorb moisture in air
Solution
1) Vacuum dry raw material at 100°C/4h to moisture <0.5%; 2) Sealed packaging for storage; 3) Seal the extruder feed section to prevent moisture absorption
Key Takeaway
PVA is strongly polar and hydrophilic and must be fully dried before processing
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