Injection Molding
7 visualizações
PP '2079851475616104452 Black Speck
Fenómeno do problema
Black specks and black streaks appear on light-colored PP parts.
Análise das causas
Carbonized material shedding from barrel/hot runner dead spots; regrind contamination; degradation from long residence at high temperature.
Solução
①Purge and disassemble-clean dead spots; ②avoid high-temperature idling; ③control regrind cleanliness; ④thoroughly purge during material change.
Conclusão principal
Black speck control relies on normalized dead-spot cleaning.
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!