Filter medium equipped with porous film, method of manufacturing same, filter pack, and filter unit
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United States of America Patent
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Jul 7, 2015
Grant Date -
Apr 25, 2013
app pub date -
Jun 8, 2011
filing date -
Jun 17, 2010
priority date (Note) -
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Abstract
A filter medium includes a porous film and a support material supporting the porous film. The porous film includes polytetrafluoroethylene, has an average pore diameter of at least 2.5 μm, and has a porosity of at least 95%. A pressure loss is less than 100 Pa when air is passed through the filter medium at a velocity of 5.3 cm/sec. A collection efficiency of NaCl particles is at least 95% when air including NaCl particles with a particle diameter of 0.3 μm is passed through the filter medium at a velocity of 5.3 cm/sec. A PF value is at least 30, where PF={−log [(100−collection efficiency (%))/100]/pressure loss (Pa)}×1000. A dust holding capacity of polyalphaolefin particles held in the filter medium is at least 15 g/m2 when air including polyalphaolefin particles with a count median diameter of 0.25 μm is continuously passed through the filter medium at a velocity of 5.3 cm/sec and pressure loss reaches 300 Pa.
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