Processing Machinery
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PVC Transparent Sheet
Problem Phenomenon
PVC transparent sheet used for observation windows turned yellow after several years
Cause Analysis
Long-term light exposure and thermal aging; ordinary sheet has insufficient weather resistance; 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
Select weather-resistant transparent sheet; avoid direct sunlight; replace regularly; 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
Transparent observation windows are selected according to weather resistance requirements; 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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