Processing Machinery
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PVC Equipment Anti-Corrosion
Problem Phenomenon
Screw and barrel of PVC-dedicated machine corroded after several years of use
Cause Analysis
Long-term corrosion by degradation HCl; ordinary nitrided layer cannot withstand PVC conditions; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Select bimetallic anti-corrosion barrel and screw; chrome-plate the mold; regular corrosion checks; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PVC equipment requires bimetallic anti-corrosion configuration; 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 similar problems in the future
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