Material Analysis
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Unstable shrinkage of PU
Fenómeno do problema
Shrinkage of PU products fluctuates ±0.8%, exceeding the ±0.2% requirement
Análise das causas
Molecular weight differences between PU batches cause shrinkage variation; processing temperature fluctuation affects crystallinity and thus shrinkage
Solução
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
Conclusão principal
Unstable shrinkage is caused by batch differences and temperature fluctuation; raw material and temperature control are key
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