Insulating glass in the detection of the problems and the reasons |
Date:2013-11-09 Author:zhaoyang Hits:1133 |
Hollow glass initial dew main test whether the air dry, GB is equal to or lower than the dew point requirement for qualified -400C , resulting in failure because the initial dew point : Use of molecular sieves unqualified or has failed , if a container containing molecular sieves Mifengbuyan , Zeolite is very likely to fail , then the activation process should be carried out , that is heated in an oven at 3000C for more than 3h , workshop air humidity is too large , aluminum frame can not be fit into the molecular sieve films, zeolite water too long lapse The main test detects ultraviolet radiation insulating glass sealant if they contain volatile organic compounds affecting sight , hollow glass samples were continuously irradiated 300W UV lamp after 168h at 23 ± 2 ℃ storage temperature of the week should not be the inner surface of hollow glass oily mist or other contaminants , the reasons for failure are: sealants high levels of volatile organic compounds , aluminum without decontamination treatment, This test is used to test the seal checker insulating glass sealant degree of hardness , and whether there are leaks , the sample is lower than the ambient pressure under the conditions of 10 ± 0.5KPa kept 2.5h, thickness deviation of 95 percent growth , the temperature at 25-55 regular changes between ℃ ) for 224 cycles within each cycle of the gas to be hollow glass after the first expansion and contraction , so that the adhesion of the sealant have higher requirements, In addition, the high humidity , water vapor transmission rate of sealant should be low, and molecular sieves have strong adsorption capacity, detection of recurrent problem is the ultimate open plastic dew point rises and causes this phenomenon is: do not use qualified sealant or shelf life has been exceeded , the high temperature and humidity test, the adhesive and the glass off the water, mixed with glue uneven , not fully cured , molecular sieve effective absorption capacity is low , or in the air exposure time is too long, the operator not careful, sealant is not good, there is the leak site , not only because of molecular sieve adsorption sealed off the production spacer layer of moisture in the air , so that the initial dew point pass , but keeps the adsorption layer diffuse into the spacer layer through the moisture , dew point is also to meet the requirements of the final glass is not clean adhesive force caused decline in the hand due to a mix adhesive glue too much , some appear vulcanized rubber , making the bubble layer increases affect bond strength, Raw materials with the unreasonable , in the production of silicone rubber insulating glass must be used in conjunction with , and butyl rubber , silicone rubber because the water vapor transmission rate is higher, This is a climatic cycle test aging test , is a comprehensive performance insulating glass inspection, it simulates the four seasons of the year the climate ( cold, heat, wind, rain ) , go through each cycle heating , natural cooling and forced cooling in three stages , a total of 320 cycles , the problem is that testing is easy burst hollow glass , plastic , and finally to open the dew point rises , mainly mentioned except in high temperature and humidity which also includes : sealant not kept at low temperatures good flexibility , sealants high content of volatile solvents ( should not exceed 1.5% ) , annealed glass sheet itself is bad , hollow glass as glass deep-processing products , more expensive , once after the installation is damaged, replace relatively difficult , so the insulating glass to carefully selected raw materials in the production process, we should strictly follow the rules , the only way the overall quality of hollow glass will have a new improved insulating glass production line |
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