Processing Machinery
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Taboo of mixing POM with PVC
Fenómeno do problema
PVC regrind was mistakenly mixed into a POM machine, producing a large amount of irritating gas during molding
Análise das causas
PVC decomposition releases HCl, which in contact with POM catalyzes its violent degradation, producing large amounts of formaldehyde and other gases; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
Strictly separate zones and equipment for POM and PVC; stop and clean immediately if mixing is suspected; manage regrind identification; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Mixing POM with PVC is a safety-accident-level taboo; 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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