J. Binnig, J. Meyer, G. Kasper

FILTECH 2007 International Conference & Exhibition for Filtration and Separation Technolgy, 02.27.-01.03.2007, Wiesbaden, Germany, Proceedings, II 27-33

It has often been suggested that the dust emission from cleanable filter media is a combination of direct particle penetration and the release of particles already "stored" in the filter media. It has also been suggested, that the importance of the second mechanism increases with filter aging, as the amount of dust stored inside increases (which additionally leads to an improvement of the collection efficiency of the filter and in consequence to a reduction of direct particle penetration).

A systematic experimental investigation into this process has been conducted with various needle felts and various types of dust. The experiments were performed with relatively new filter media as well as media that had been aged using different methods for up to 20000 cycles. The results obtained so far indicate that direct penetration is by far the dominant mechanism and causes more than 95 % of the particulate emission of a surface filter.