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Dry Screw Vacuum Pump in Photovoltaic Module Laminating Technology

Dry screw vacuum pump provides vacuum technology for lamination process of photovoltaic module, so as to meet the high standard requirements of quality, efficiency and reliability in its production process.


Oil-lubricated rotary vane vacuum pumps are used in the initial production process of photovoltaic modules, but this brings a lot of maintenance operations and frequent maintenance requirements. All oil-lubricated rotary vane vacuum pumps need to replace the vacuum pump oil once a week or every two weeks, and all kinds of pump filter elements also need to be replaced in time. Moreover, the reliability of such vacuum pumps is relatively poor, which often leads to production shutdown and waste of raw materials. Annual maintenance and maintenance costs are high. In order to solve the problems related to vacuum generation. The manufacturer of EVP vacuum pump recommends that dry screw vacuum pump be used, and no working fluid is needed for its operation.


The lamination process of photovoltaic modules is fully automated, and the production is carried out all-weather and uninterrupted. Vacuum pump is used to extract air from laminator to make the photovoltaic modules absolutely flat when laminated without any air or gas inclusions. Such a tight seam overlap allows each layer of the module to be tightly combined at high temperatures above 140 C, forming an air seal. The higher the vacuum degree in the combination process, the better the quality of photovoltaic modules and the longer the service life, because high vacuum can prevent the formation of air and gas voids between layers. Screw vacuum pump technology can achieve 0.15 - 0.4 millibar (15 - 40 Pa) vacuum level in laminator, which is much lower than the common 1 millibar (100 Pa) vacuum level in photovoltaic module industry.


Dry screw vacuum pump has absolute reliability and sustained high pumping speed under low pressure. This technology not only brings higher quality, but also reduces the operation cost due to the minimization of maintenance operations. The oil-lubricated vacuum pump used in the past needed to replace the pump oil and filter element every week, but now it only needs to be maintained every year or even every two years. This is due to the design of screw vacuum pumps, which are tailor-made for this process and are completely free from the additional steam generated during the evaporation of vinyl acetate (EVA) foil during melting (the steam will mix with the air in the laminator). In oil-lubricated vacuum pumps, the vapor will condense and degrade with the vacuum pump oil, resulting in frequent replacement and maintenance of the pump oil.


Dry screw vacuum pumpare water-cooled and can be adapted to lamination process by integrated temperature controller. Thanks to dry (oil-free) compression technology and anti-particle and steam intrusion characteristics, high availability has been achieved.


Dry screw vacuum pump makes the vacuum generation technology in lamination process reach the highest efficiency, economic efficiency and quality level.

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Dry screw vacuum pump


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