Material Drying
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PVC Recycled '2079851475616104451
Problem Phenomenon
PVC products with recycled material show increased bubbles and degradation points
Cause Analysis
Recycled material contains water and heat history accumulated, stabilizer partially consumed; 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
Recycled material dried separately; blending ratio controlled; add stabilizer; downgrade use; 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 recycled material needs drying plus stabilizer compensation; 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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