Material Analysis
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Unstable PVA shrinkage rate
Problem Phenomenon
PVA product shrinkage rate fluctuates ±0.8%, exceeding the ±0.2% requirement
Cause Analysis
Molecular weight differences between PVA batches cause shrinkage variation; processing temperature fluctuation affects crystallinity and thus the shrinkage rate
Solution
1) Strictly control raw material batch consistency; 2) Processing temperature stable ±2°C to ensure consistent crystallinity; 3) Mold shrinkage compensation with reserved adjustment space
Key Takeaway
Unstable shrinkage rate is caused by batch differences and temperature fluctuation; raw material and temperature control are the key
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