Put the prepared glass in a vacuum bag for vacuuming, the vacuum degree is ≥700mmHg (0.092Mpa), the temperature is 100-110°C (the actual temperature of the glass surface), keep it warm for 10 minutes, cool to below 60°C, and then remove the vacuum.
Because of the material characteristics of EVA, there are very high requirements when EVA is processed and formed. According to its strict requirements on the service life and anti-aging of solar cells, many domestic manufacturers have made significant progress in formula after continuous trial and error. Most of the domestic EVA films have reached the international advanced level (all indicators meet the requirements, some indicators exceed foreign products).
Due to the harsh requirements of the photovoltaic industry, the requirements for EVA production equipment are also very high. The stability of the equipment, the control of the shrinkage rate, and the loss of its formula components are affected as little as possible. There are many manufacturers of film equipment in China, but they all fail to meet the requirements more or less. As a result, many EVA manufacturers have chosen to assemble or assemble their own equipment. Until 2010, there was a domestic manufacturer of the entire EVA film production line (Suzhou Kingwell Machinery Co., Ltd.). China's pace of development in the EVA industry is even faster. The cost of the EVA film is reduced, and the cost of the photovoltaic industry is indirectly reduced.