Injection Molding
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PET Injection Preform Black Specks
Fenómeno del problema
Black small dots appear on the preform, more obvious after bottle blowing.
Análisis de la causa
Carbonized material at dead corners of the barrel/hot runner falls off; PET is sensitive to heat history, and regrind or contamination also introduces black specks.
Solución
①Clean the hot runner and barrel dead corners; ②avoid long-time heat preservation; ③control regrind cleanliness; ④thoroughly purge when changing material.
Conclusión clave
Preform black specks = dead-corner carbonization.
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