Molds & Tooling
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PA66 black speck traceability
Fenómeno del problema
Black specks randomly appear on light-color PA66 products, with gradually increasing frequency
Análisis de la causa
Material accumulates and carbonizes in dead corners of the barrel and nozzle and falls off, or material hides and degrades in hot runner dead corners, and black specks increase with time accumulation; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solución
Disassemble and clean the screw, nozzle, and hot runner; thoroughly transition with purging compound when changing material; black speck statistical trend monitoring of equipment state; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Conclusión clave
Increasing black specks is a signal of material hiding in equipment, disassembly and cleaning are mandatory; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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