Fibertex Nonwovens A/S Hall 7 / H14

Nanofiber coated filtration medias have been used for a long time in surface loading filter systems due to easy dust cake release and easy pulsing. In depth filtration applications nanofiber products have not gained notable success. This problem has been related to the premature blinding of the nanofiber layer collecting most of the dust filtered causing a fast pressure drop increase and a short filter life.

On this presentation recent developments to overcome this problem is presented in a form of couple examples on HVAC and cabin air filter applications. As comparative products conventional glass fiber and electret meltblown composite product results are presented.

The development of new combined pleating and dust holding layer overcomes the problems previously associated with nanofibered depth filtration medias. This new type of gradient media acts as an excellent dust holding layer and prefilter to eliminate the premature blinding of nanofiber layer due to excessive dust accumulation. The slow pressure drop increase reduces energy consumption during the lifetime of the filter.

At the same time the media layer functions well in all pleating processes, both in rotary and blade pleating and in further embossing. The new gradient layer can be used in all depth filtration applications from ePM1 >50 % efficiencies up to HEPA grade efficiencies.