Extrusion & Post
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EVA Photovoltaic Busbar Bending
Problem Phenomenon
After lamination, the busbars bend and deform inward.
Cause Analysis
During lamination, gas gathers at the busbar position; when the rubber plate presses down to exhaust, this gap needs to be filled by EVA, and the flowing EVA bends the busbar; EVA shrinkage also aggravates it.
Solution
①Extend the vacuuming time; ②reduce the lamination pressure; ③select materials with suitable fluidity; ④optimize the layup exhaust path.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Busbar bending is a coupling problem of exhaust and material fluidity; vacuum time and lamination pressure are the main adjustment parameters.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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