Material Drying
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PVC Bubble Troubleshooting
Problem Phenomenon
Bubble positions on PVC products are random
Cause Analysis
Three causes: moisture, degradation gas, entrapped air—PVC degradation gas accounts for a high proportion; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
First check temperature and residence to rule out degradation; then check drying; finally check venting 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 bubbles, check degradation first, then moisture; 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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