Material Analysis
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Unstable EVOH Shrinkage
Problem Phenomenon
EVOH product shrinkage fluctuates ±0.8%, exceeding the ±0.2% requirement
Cause Analysis
Molecular weight differences between EVOH batches cause shrinkage variation; processing temperature fluctuations affect crystallinity and thus shrinkage
Solution
1) Strictly control raw material batch consistency; 2) Stabilize processing temperature ±2°C to ensure consistent crystallinity; 3) Reserve adjustment space in mold shrinkage compensation
Key Takeaway
Shrinkage instability is caused by batch differences and temperature fluctuations; raw material and temperature control are key
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