Molds & Tooling
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PET black speck systematic cleaning
Fenómeno del problema
Black specks repeatedly appear on light-colored PET products and recur shortly after cleaning
Análisis de la causa
Black specks originate from carbonized material in dead corners of the barrel and nozzle and from hot runner retention; surface cleaning cannot eradicate them; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Disassemble and wash the screw, nozzle and hot runner; use purging material in the material change procedure; include the black speck trend in equipment condition monitoring; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Black specks are eradicated by disassembly and washing; trend monitoring prevents recurrence; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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