Injection Molding
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PP '2079851475616104452 Black Speck
Fenómeno del problema
Black specks and black streaks appear on light-colored PP parts.
Análisis de la causa
Carbonized material shedding from barrel/hot runner dead spots; regrind contamination; degradation from long residence at high temperature.
Solución
①Purge and disassemble-clean dead spots; ②avoid high-temperature idling; ③control regrind cleanliness; ④thoroughly purge during material change.
Conclusión clave
Black speck control relies on normalized dead-spot cleaning.
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