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