Melt blown (MB) fabrics are composed of fine fibers which contribute to high filtration efficiency (FE) and low air flow resistance compared to high efficiency filtration media such as fiber glass paper. Furthermore, MB fabrics are mostly made of polypropylene (PP) polymer, which can be electrostatically charged to enhance the media filtration efficiency without the increase of air flow resistance. However, different charging techniques or charging at different locations on the MB line will contribute to different filtration efficiency. This paper compares the efficiencies of different charging techniques in the MB line.
Wente VanA.Industrial Eng. Chem., Vol. 48, 1956, p. 1342.
2.
HindsW.C., Aerosol Technology, 1982, John Wiley & Sons.
3.
TsaiP.P., and WadsworthL.C., “Electrostatic Charging of Meltblown Webs for High-Efficiency Air Filters,”Advances in Filtration and Separation Technology, Vol. 9, 1995, PP 473–491.
4.
SmithP.A., EastG.C., BrownR.C., and WakeD., “Generation of Triboelectric charge in Textile Fiber Mixtures and Their Use as Air Filters,”J. Electrostatics, Vol. 21, 1988, PP 81–98.
5.
TsaiP.P., QinG.W., and WadsworthL.C., “Theory and Techniques of Electrostatic Charging of Meltblown Nonwoven Webs,”TAPPI JOURNAL, Vol. 80, No. 7, 1988.
6.
TsaiP.P., and WadsworthL.C., “Method and Apparatus for the Electrostatic Charging of a Webs or Films,” US Patent 5,401,446, March 28, 1995.
7.
WadsworthL.C., and DavisW.T., “Method for Testing Filtration Efficiency,” US Patent 4,382,378, May 10, 1983.
