Injection Molding
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PETG injection molded part shrinkage rate too large
Fenómeno del problema
The shrinkage rate of PETG injection molded products exceeds 0.5%, and the dimensions deviate from the mold design.
Análisis de la causa
Holding pressure and holding time insufficient, feeding inadequate, mold temperature high with large cooling shrinkage, processing temperature high with large specific volume.
Solución
Increase holding pressure (60-70% of injection pressure) and extend holding time; appropriately lower the mold temperature to 20-40°C; control melt temperature at 230-250°C.
Conclusión clave
PETG is an amorphous material, and the shrinkage rate is mainly controlled by holding pressure and cooling.
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