Material Drying
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PVC Post-drying Management
Problem Phenomenon
Dried PVC powder left overnight then products bubble
Cause Analysis
Powder has large specific surface area and absorbs moisture fast, re-absorbs moisture after drying when left; 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
Use up powder same day after drying; store sealed; re-dry when over time; 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 powder used immediately after drying, not overnight; 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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