Test method for helium storage capacity of airship airbag materials

Abstract: helium is a commonly used floating gas for airship The material used for airship air bag is an important factor affecting the use of airship This paper introduces an effective test method to verify the helium storage capacity of airship air bag through the measurement of helium transmission of airship air bag sample and the description of test principle, test equipment parameters, application scope and test process Key words: helium, helium penetration, airship air bag, helium barrier, differential pressure gas permeameter 1 Airship is a kind of floating device, which mainly depends on the lighter gas in the air bag, such as hydrogen and helium Because of the danger of hydrogen, modern airships usually use helium with higher safety as floating gas According to the principle of buoyancy, the amount of helium filled in the air bag is an important factor to determine the amount of buoyancy that can be generated, which directly affects the flying height of the airship During the use of airship, the helium content in the air bag is closely related to the helium storage capacity of the external materials of the air bag If the helium storage capacity of the air bag materials is poor, it is easy to lose in the use process, which will reduce the flying height and flight time of airship The permeability of helium in materials is an important index to measure the helium storage capacity of airbags Therefore, this paper tests the helium penetration of airship airbags 2 In this paper, the composite material of airship air bag lamination is taken as the test sample 3 According to this test, the principle of differential pressure method is used to test the helium transmission of the sample, and the standard is GB / T 1038-2000 test method for gas transmission of plastic film and sheet - differential pressure method 4 In this paper, vac-vbs differential pressure gas permeameter is used to test the test equipment, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 1 test principle of vac-vbs pressure difference gas permeameter The test chamber of the equipment is divided into high-pressure chamber and low-pressure chamber through the sample The high-pressure chamber is filled with a certain pressure of test gas, and the low-pressure chamber forms a certain low-pressure environment through vacuum pumping Under the effect of pressure difference, the test gas penetrates from the high-pressure chamber to the low-pressure side through the sample When the test reaches stable penetration, the pressure in the low-pressure chamber changes with time and is calculated Gas transmission and related parameters of the sample 4.2 test range of equipment parameters is 0.1 ~ 100, 000cm 3 / (M 2 · 24h · 0.1MPa); can complete the test of three samples at the same time, the test result is the average value of the test results of three samples; the temperature range of the sample is 15 ~ 55 ℃, the temperature control accuracy is ± 0.1 ℃; provide standard membrane for rapid calibration to ensure the accuracy and universality of the test data; support Lystem TM Laboratory data sharing system, unified management of test results and test reports 4.3 scope of application (1) this equipment is applicable to the gas permeability test of various films and sheets Film type includes various plastic film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other film-like materials; sheet type includes various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet (2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, fiberglass cloth, fiberglass paper, cosmetic hose sheet, various rubber sheets and other materials (3) This equipment is suitable for the transmittance test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc (4) This equipment meets many national and international standards, such as iso15105-1, iso2556, GB / t1038, ASTM d1434, JIS k7126-1, ybb00082003 5 During the test (1), three samples with diameter of 97mm were cut from the airship airbag samples (2) Apply a layer of vacuum grease around each test chamber, place a piece of filter paper in the test area, attach the sample to the test chamber, press gently, remove the bubble between the sample and the test chamber, and then clamp the sample with the clamping device (3) After the equipment is connected with helium, set the parameters such as sample name, thickness, test mode, test temperature, humidity and vacuum pumping time on the control software, click the "start test" option, turn on the vacuum pump, and conduct the test The equipment carries out automatic test according to the set parameters After the test, the test results will be displayed 6 The results showed that the helium permeability of the airship air bag was 28.91 cm 3 / (M 2.24 h.0.1 MPa) 7 Conclusion airship airbags should have high gas barrier performance to prevent internal gas loss and external gas penetration into the airbags, so as to maintain the internal floating gas volume and gas purity In this paper, the helium penetration test is used to evaluate the helium storage capacity of the airship air bag materials tested The test process is simple, the interference of human factors is less, the equipment is highly intelligent, and the test results are reliable Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research, development and production of packaging testing equipment and packaging testing services The existing equipment includes gas transmission tester, oxygen transmission tester, water vapor transmission tester, intelligent electronic tensile tester, sealing tester, heat sealing tester, dart impact quality, pendulum impact tester, friction tester Coefficient of friction meter and so on The more you understand, the more you trust! 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