Material Drying
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PVC Silver Streak
Problem Phenomenon
Radial silver streaks on PVC product surface
Cause Analysis
Caused by moisture or shear heat; PVC is shear-sensitive; 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
First verify by drying; if not eliminated, reduce speed and back pressure; 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
For PVC silver streaks, troubleshoot moisture first, then shear; 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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