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Filter Media Design for Liquid Filtration Application

icon-industry-filtrationCourse: Half Day, 0.4 CEUs
Kyung-Ju Choi – Instructor

The high efficiency at a low pressure drop of a filter is the ultimate goal throughout the filtration industry.  There is a trade-off between these two parameters.  Multi-layer composites with fine/nano sized filaments seem to be the recent trend.  The filters with multi-layered nonwoven material generally increase the dust holding capacity if it is designed appropriately. The principles of designing the multi-layer media for liquid application will be discussed.

There are two basic methods to manufacture the multi-layer media.  They are; 1) collate layers with minimal or no use of the mechanical, chemical or fuse bonds, and 2) bonded layers by mechanical,  chemical or fuse bond means.

A number of different techniques that are currently being used to produce filter media including fine/nano-fiber webs and their composites for filtration applications will be discussed. These techniques include wet-laid, dry-laid, spunbond, spunlace, electrospinning, hybrid electro melt blowing, melt blowing, fiber splitting systems, force spinning and film stretching. The equipment and fundamental know how behind each of these techniques is explained along with the advantages and difficulties of each.

Course Outline

  • Benefit of making multi-layer media vs. single layer or double layers
  • Basic principles to design multi layers
  • Methods of making multi-layer media
  • How to test the multi-layer media
  • Techniques to produce media with fine to nano-fibers (filaments)

Instructor Bio:

Dr. Kyung-Ju Choi is a past chairman of the American Filtration & Separation Society (AFS) and has been the basic filtration course instructor since 2000. He received MS and Ph.D. in Polymer Engineering at the University of Tennessee in Knoxville.   He is currently an adjunct professor of Chemical Engineering in the University of Louisville.   He was with AAF (American Air Filter) International as Director of Global Media Development until Oct. 2009.  He was Sr. Staff Scientist with Cummins Filtration from 1986 to 1995.  He has more than 120 technical publications, 40 US patents and numerous corresponding international patents.

He has been actively involved in AFS, Fiber Society, and American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).  He was the AFS conference chair in 2011, 2002 and 1995, the Fiber Society Symposium chair in 2004, and symposium chair on Indoor Air Quality for ASHRAE in 2005.  He was also the lecturer for the Fiber Society in 2005 and a governing council member of the Fiber Society for 2004.  He was the first recipient of Senior Scientist Award in 2000 and the recipient of Frank Tiller Award, for scientific achievement, in 2007.