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Definition of oil filter material performance
2012-10-12
Modern-pass oil filter, filtering accuracy defined gradually hydraulic filter, filter characteristics of the evaluation method of containing pollution particles of oil filtration process, determine before the filtration of particles of a size and number after the filtration ratio (efficiency) The filtration precision ". This method is called &... Modern-pass oil filter, filtering accuracy defined gradually hydraulic filter, filter characteristics of the evaluation method of containing pollution particles of oil filtration process, determine before the filtration of particles of a size and number after the filtration ratio (efficiency) The filtration precision ". This method is called "multiple times by the test method. Many times by the test method was originally from Oklahoma State University Fluid Power the research center Feiqiboshi leadership development, and later became the American National Standards, 1981 to be included in the international standards, the test methods for evaluation filtration performance of hydraulic technology. Where the of industrial oil system and engineering vehicles oil system used filter gradually preclude the use of the standard, and the performance evaluation of the filter material in foreign countries preclude the use of. Assessment methods: the test system in accordance with the regulations put into test powder, and the pollution of oil through the filter (or filter material) were in the test section to establish differential pressure, almost in a few pressure test in the filter before and after sampling, measurement a filter before and after filtration of at least 6 the number of particles of different sizes, and then filtered off and the corresponding dimensions of the number of particles before the number of particles by dividing the filtered derived filter ratio (β). Reduce the number of particles in the contaminated fluid filter differential pressure process test system will slowly injected into the system by another dirt (high concentrations of contaminated liquid).The pressure difference amounted rating that stop the test. 6 size particle filtration ratio β value, and if it has reached 75, then the test filter accuracy value is determined as the size. Many times through the test method and different the 1980s glass ball test method is based on optical technology and equipment of automatic particle counters directly measured by the size and number of particles, the final assessment of the ratio of the particles of a size filter, and concluded that filtering accuracy Size (microns) under a specified ratio. The early years of the glass ball method in foreign filter material company, Italy Boss and Belgium Bekaert used is learn from filter precision measurement standards MIL F 8815D "glass beads by law". At that time, many companies use the standard rating filter Chinese aviation standards HB5825, HB6146 (General technical conditions of the air filter) is defined by the largest particle test F 9, F 13, F 15, F 17 and F 19, etc. different size distribution of the glass beads powder, and the test methods are the same as in the MIL F 8815D. After entering the 1990s, more famous abroad filter material company is no longer used MIL F4 8815D, while the use of ISO4572 (1995 years to ISO16889) standard, namely multi-pass test method. Figure 1 is a Bekaert company is displayed on the sample many times through the test system circuit diagram. Lydall and Bekaert is the first to draw on filter accuracy evaluation method of filtering material manufacturing company, to filter performance the filtration precision definition and assessment method directly equated own production of r filter material, by the filter manufacturer welcome , to the selection and testing of the new filter design stereotypes to create a great convenience and take many detours less.Method of filter the materials performance test method and there is no uniform international standards. Single-from filtering accuracy test methods can be seen: Bekaert company sample aperture test, air permeability test and dirt holding capacity test indicate the test method Bian standard column, but only filtering accuracy is not as marked, though not seen the past samples marked "MIL F 8815D" words, but can think Bekaert company is still using the old method. Lydall, different from Figure 2 several times by the test bench to see that many times through the stage of the trial is designed to filter material. While the Figure 3Bekaert big table can not be used to do the filtration precision tests of the filter material, and it is only used in the dirt holding capacity test, because the test to get the value of the resistance value of the initial resistance of the filter material after processing test gray two parameters.Pall Corporation, USA is recognized worldwide as the filter manufacturing top companies, has consistently claimed that the production for own consumption of filter material, certainly has its own filter material performance testing standards, production for the filter material takeaway performance test method is not made public. The company has been involved in many of the international standardization bodies ISO organization filter performance test method standard-setting work, filter material for its own use test methods will be very close to the filter, and other filter materials manufacturers test method will be different. It can be judged foreign filter material performance test method has its own standard.   View Details
Two kinds of environmentally friendly non woven filter material
2012-09-10
Two kinds of environmentally friendly non-woven air filter materiala non-woven material, with Russian production made ​​of heat-resistant fiber the Aru Xie Lun heat filter dust bag filter chemical dust and gas, especially for aviation fuel engine emissions filtering. Aru Xie Lun fiber can be a long time for 250-300 ℃ environment, a short ti... Two kinds of environmentally friendly non-woven air filter materiala non-woven material, with Russian production made ​​of heat-resistant fiber the Aru Xie Lun heat filter dust bag filter chemical dust and gas, especially for aviation fuel engine emissions filtering. Aru Xie Lun fiber can be a long time for 250-300 ℃ environment, a short time can heat 400-450 ° C, good wear resistance, acid solvent, organic solvent resistance, resistance to oil, petroleum, resistance to different concentrations inorganic acids and bases, it is made ​​of heat-resistant filter dust bag, has a good mechanical resistance, gas permeability, a suitable porosity, preferably a surface density of 180g/m2, not only to high temperature, and impact on aeropower small, high purification efficiency. Another is to select the polyester staple fibers as the main raw material of needling the non-woven fabri cair filter material, the surface density of 300g/m2, by showed strong analytical sample, if you increase the bicomponent fibers in the non-woven materials, help increase the rigidity of the air filter material, resistant foldability. Containing 50% polyester bicomponent fiber is the best, this non-woven filter material for purifying the hydrocarbons generated by the fuel engine work. View Details