Processing Machinery
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PPO Black Specks and Carbonization Contamination
Fenómeno del problema
[Problem Phenomenon] Black specks scattered on PPO products, recurring intermittently after cleaning
Análisis de la causa
Discolored degraded material with residence exceeding 2 hours, carbonized peeling from barrel dead spots and regrind contamination are sources of black specks; the corrosiveness of decomposition gas accelerates the deterioration of dead-spot material; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Strictly enforce residence time management; regularly clean the barrel and hot runner to check dead spots; manage regrind cleanliness and screening; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For PPO black specks first check residence-discolored material, then check dead spots and regrind; after confirming effectiveness, solidify 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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