Processing Machinery
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POM and PVC cross-contamination risk
Fenómeno do problema
After switching between POM and PVC on the same machine, products decompose violently and smoke.
Análise das causas
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.
Solução
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.
Conclusão principal
POM×PVC = dangerous combination, material change must be thorough.
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