Material Analysis
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Unstable shrinkage of PU
Fenómeno del problema
Shrinkage of PU products fluctuates ±0.8%, exceeding the ±0.2% requirement
Análisis de la causa
Molecular weight differences between PU batches cause shrinkage variation; processing temperature fluctuation affects crystallinity and thus shrinkage
Solución
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
Conclusión clave
Unstable shrinkage is caused by batch differences and temperature fluctuation; raw material and temperature control are key
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