Filter medium and air filter unit using the same

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 71/36 (2006.01) B01D 39/16 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 69/10 (2006.01) B29C 55/00 (2006.01) B29C 55/06 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2274078

A filter medium which has an average pore diameter of more than 0.5 µ m, a pressure loss of 2-50 mmH2O determined when air is permeated therethrough at a velocity of flow of 5.3 cm/sec, and a PF value of 18-12, which is calculated in accordance with the following equation on the basis of this pressure loss and a collection efficiency using DOP of a grain size of 0.10-0.12 µm. PF value = -log(Permeability(%)/100) x100 . Pressure Loss Permeability (%) = 100 - Collection Efficiency (%).

La présente invention concerne un milieu filtrant caractérisé par un diamètre moyen des pores supérieur à 0,5 mu m, par une chute de pression de 2-50 mmH2O déterminée pour une perméation de l'air dans le milieu à une vitesse d'écoulement de 5,3 cm/s, et par une valeur du coefficient PF de 18-12, calculée d'après l'équation selon laquelle on a PF = [ -log (perméabilité (en %) / 100 ] / [ chute de pression ] * 100, pour une perméabilité (en %) = 100 - efficacité de rétention (en %), et pour des valeurs de chute de pression et d'efficacité de rétention calculées en utilisant un différentiel de pression correspondant à un calibre du grain compris entre 0,10 et 0,12 mu m.

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