The function of solar battery backboard and detect method

Solar battery backboard is located in package the reverse side the outerest, outdoors environment issues those who protect solar energy component not to get moisture to erode, have three-layer structure commonly. Outer covering layer is had fight an environment goodly to erode ability (prevent lunt to erode, fight ultraviolet ray to wait) , intermediate layer has good insulation property and strength for PET polyester film, filmy PEVA or PE and EVA glue film have lining to be stuck goodly receive performance. The first, ply to different material, the product ply that makes also is different, to obtain certain insulation property, ply of generally speaking PET is filmy ply of 250 μ M, PVDF to be ply of film of 25 μ M, PEVA to be 70 μ M, the ply of two glue sticky agent all is controlled in 10 μ M. So the ply of KPK of solar energy backboard is 320 ± 10 μ M, KPE ply is 365 ± 10 μ M. Detect method: Detect with thickness gauge material ply. The 2nd, tensile strength, rupture percentage elongation, come off intensity 1, tensile strength (cent is MD, TD) : Backboard sample produces the peak load when rupturing, the backboard of ply, different to differring material has different tensile strength. 2, rupture percentage elongation (cent is MD, TD) : Backboard sample produces the biggest percentage elongation when rupturing, the backboard of ply, different to differring material has rupture differently percentage elongation. 3, come off between initiative layer intensity (cent MD, TD and the first, 2) : Test backboard each bonding strength between, the commonnest standard is Cm of ≥ 4N ／ (1000Pa of ＝ of 1N ／ Cm) . 4, come off between the layer after water boils intensity (cent MD, TD and the first, 2) : Place backboard after immersing 24 hours in boiling water bath, test backboard each bonding strength between, the commonnest standard is Cm of ≥ 4N ／ (1000Pa of ＝ of 1N ／ Cm) , tacky, hair is not had after water is boiled yellow, drape, statified wait for undesirable phenomenon. 5, after backboard and lamination of EVA glue film come off intensity: Test the bonding strength after backboard and lamination of EVA glue film, this test is current situation of imitate component production, the bonding strength between different backboard and different EVA glue film has certain difference, but general level is Cm of ≥ 40N ／ . Detect method: Take length to be 300mm about, the toughened glass that width is 150mm together, the backboard of same size mixes ordinal on toughened glass cascade EVA, put in the lamination in lamination machine. Room temperature is placed to cool after undertaking lamination solidify 4 hours above, solidify cut into parts cut those who be 1 ＊ 300mm is small. Take a few among them, depart backboard and EVA by hand respectively 20mm left and right sides, secure specimen go up in tensile test machine, undertake for 100mm ／ Min with speed 180 ° come off, come off every time 100mm, record its data, test result goes the median of data. Afore-mentioned in tensile strength, rupture percentage elongation, come off intensity is detected by pull test machine. The 3rd, dimension stability (hot contractive property) cent MD, TD to, backboard is roast below 150 ℃ its check to be in after half hours the shrinkage of length and width direction. Relatively general level is equal to to be less than 1. 5 ％ . The 4th, lunt transmitance detects method: 3 kinds detect method, it is cup type law respectively, electrolysis, infra-red law, electrolysis of industry of smooth hot season is relatively general. Electrolysis lunt transmitance detects method: Good foreclose sample is fixed checking antrum will check to divide fluctuation among antrum two antrum, the gas of relatively stable humidity is in go up filmily antrum flows, dry gas flows in next filmy antrum, water element diffuses through sample in the dry gas of another side, be carried to come by going from place to place gas sensor, the lunt chroma through be being measured to sensor undertakes an analysis, calculate thereby give lunt to pass through a quantity. The 5th, GB2410 of light transmittance basis, 80 " transparent and plastic light transmittance and haze experiment method " , it is the standard method that light transmittance of EVA glue film determines. The experiment instrument that chooses in this standard is haze of integrating sphere type plan, other the test instrument that can achieve similar result also can be used. CNC Milling