Injection Molding
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Large shrinkage rate fluctuation of PET injection parts
Fenómeno del problema
Unstable dimensions of PET injection products, shrinkage rate fluctuates between 0.2%-0.8%, affecting assembly accuracy.
Análisis de la causa
Insufficient holding pressure and holding time, mold temperature fluctuation causes crystallinity differences, uneven cooling rate, material IV value differences.
Solución
Increase holding pressure to 60-80% of injection pressure, extend holding until gate solidification; stabilize mold temperature ±2°C; control IV value 0.75-0.85dL/g.
Conclusión clave
PET shrinkage rate is dominated by crystallinity and holding pressure; process stability is the guarantee of dimensional accuracy.
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