Processing Machinery
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POM and PVC cross-contamination risk
Problem Phenomenon
After switching between POM and PVC on the same machine, products decompose violently and smoke.
Cause Analysis
Mutual contamination of POM and PVC during processing triggers a violent decomposition reaction (HCl released by PVC catalyzes POM decomposition), which is a safety risk.
Solution
①Strictly prohibit direct switching between POM and PVC without thorough purging; ②thoroughly purge with cleaning compound when changing material; ③disassemble and clean the nozzle and hot runner; ④post the material change SOP on the wall.
Key Takeaway
POM×PVC = dangerous combination, material change must be thorough.
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