Material Drying
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PET photovoltaic backsheet
Problem Phenomenon
PET film for photovoltaic backsheets yellows and chalks after ten years outdoors
Cause Analysis
Long-term action of ultraviolet light and water vapor causes photo-oxidation and hydrolysis of PET; aging accelerates when the outer layer is unprotected; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
The backsheet uses fluorine-containing coating or composite structure to protect the PET substrate; verify by both damp heat and UV aging tests; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Photovoltaic backsheets require composite protective structures; bare PET is not weather-resistant; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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