Processing Machinery
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Taboo of mixing POM with PVC
Problem Phenomenon
PVC regrind was mistakenly mixed into a POM machine, producing a large amount of irritating gas during molding
Cause Analysis
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
Solution
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
Key Takeaway
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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