Material Drying
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EVA Photovoltaic Film Bubbles
Problem Phenomenon
Bubbles appear in laminated modules, affecting encapsulation quality and module life.
Cause Analysis
The EVA film absorbs moisture after being left for too long after cutting; the vacuum time is too short to drive out the bubbles; insufficient lamination or uneven heating plate temperature causes local premature curing; oxygen generated by peroxide decomposition is also a source.
Solution
①Control the EVA film to be cut and used immediately; ②extend the vacuuming time; ③increase the lamination time or pad high-temperature cloth to make the heating uniform; ④determine the total lamination time according to the manufacturer's parameters to avoid being too long.
Key Takeaway
Module bubbles have multiple sources such as material moisture absorption, insufficient vacuum and uneven temperature; setting process parameters according to the supplier window is a basic discipline.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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