Processing Machinery
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PVC Material Change Cleaning
Problem Phenomenon
After PVC changes to other materials, black specks persist for long
Cause Analysis
PVC degraded residual material carbonizes in dead corners, and corroded surface holds material severely; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Material change thoroughly replaced with purging material; empty before shutdown; regularly dismantle, clean and check corrosion; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PVC material change cleaning must be thorough and corrosion 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 later
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