High efficiency synthetic filter medium

Details High efficiency synthetic filter medium High efficiency synthetic filter medium

B - Operations, Transporting

01

D

B01D 39/04 (2006.01) B01D 39/16 (2006.01)

Patent

CA 2340355

A high efficiency filtration medium comprised of a nonwoven filter web of electret charged fibers of a nonconductive thermoplastic resin having a resistivity greater than 10 14 ohm-cm, preferably polypropylene. The nonwoven filter web has a basis weight (BW) of less than 60 grams/m2, an effective fiber diameter (EFD) of less than 5 microns and a penetration (PEN) of less than 0.03 %, wherein the ratio (1); BW/ (EFD .cndot. PEN) is greater than 200. The invention filter medium can be easily used in applications requiring HEPA performance at relatively low pressure drops.

L'invention concerne un support de filtrage à haute efficacité comprenant un voile filtrant non-tissé composé de fibres chargées d'électrets, en résine thermoplastique non conductrice présentant une résistivité supérieure à 10<14> ohm-cm, de préférence un polypropylène. Ce voile filtrant non tissé présente un grammage (BW) inférieur à 60 grammes/m<2>, un diamètre sur flancs (EFD) des fibres inférieur à 5 microns et une perméance (PEN) inférieure à 0,03 %, le rapport (I) BW/(EFD • PEN) étant supérieur à 200. Ce support de filtrage peut être aisément utilisé dans des applications nécessitant une performance de type HEPA avec des pertes de charge relativement faibles.

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