Material Analysis
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MP unstable shrinkage rate
Problem Phenomenon
MP product shrinkage rate fluctuates ±0.8%, exceeding the ±0.2% requirement
Cause Analysis
molecular weight differences between MP batches cause shrinkage rate variation; processing temperature fluctuation affects crystallinity and thus 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 fluctuation; raw material and temperature control are key
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