The manufacturing process of pv solar panels is composed of several phases, in today’s article, we continue with the previous article, about the solar cells, and describe the process of rolling, curing and framed.
Lamination and curing
The rolling materials are:
EVA (Ethylene-Vinyl-Acetate): which is the encapsulant.
Tedlar: is a material made up of three layers Tedlar-Polyester-Tedlar, is responsible for the tightness of the solar module by its rear face. The tedlar protects the polyester from the degradation effects that sunlight has on it.
Glass: it is a glass of low content in iron to improve its transmissivity. It has to be impact resistant so it is tempered glass.
The materials are placed in the following order: Glass-EVA-Cells-EVA-Tedlar.
The lamination process consists of making a compact of all the described materials (EVA, Tedlar, Cells) without any air inside and with the layers of the different materials adhered to each other.
‘Laminating’ equipment is used which carries out a heating, vacuum and pressure cycle to achieve this purpose. The set of laminating materials is placed on a hot platform (100 ° C) and the laminator cap is closed leaving a sandwich, at the same time that the vacuum is heated. When the desired vacuum level is reached, a diaphragm that presses on the rolling materials presses down.
It is the process to place, to the laminate, an aluminum frame that has a double function:
Protect the rolled perimeter from impacts and moisture.
Give the module a manageable structure and facilitate its installation.
To fix the frame is filled the channel with silicone where the edge of the laminate is housed. A frame is placed on each side of the laminate and the frames are screwed together, giving the module a mechanical rigidity.
Article developed by the technical department of SunFields Europe: eng.sfe-solar.com