Material Drying
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PA66 startup pre-drying confirmation
Fenómeno del problema
Direct production at startup after a long holiday, first batch of products all scrapped for silver streaks
Análisis de la causa
Material and equipment absorbed moisture during shutdown, startup without re-drying confirmation, wet material directly enters the cavity; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
Post-holiday startup process: re-dry material 4 hours and sample-check moisture content; barrel air-shot discharge until strands bubble-free; first article full inspection before mass production; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
After shutdown, restarting must re-confirm material and equipment state; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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