Processing Machinery
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PVC Chemical Resistance Application
Problem Phenomenon
PVC pipelines swelled and leaked after conveying solvent
Cause Analysis
PVC resists acids and alkalis but has poor tolerance to ketones, aromatic hydrocarbons and other solvents; 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
Check the conveyed medium against the compatibility table; switch solvent media to PP or PTFE; 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 chemical resistance has boundaries, and solvent media must be checked; 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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