AIR FILTER MEDIUM, FILTER PLEAT PACK, AND AIR FILTER UNIT
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United States of America Patent
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Nov 23, 2023
app pub date -
Sep 28, 2021
filing date -
Sep 28, 2020
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Abstract
An air filter medium includes a collection layer, an air-permeable adhesive layer, and a porous fluorine resin membrane in this order from upstream to downstream of the filter medium. An initial pressure drop of the filter medium at a permeate flow rate of 5.3 cm/sec is 250 Pa or less. When a test is performed in which polydisperse polyalphaolefin particles having a peak in number in a particle size range of 0.1 to 0.2 μm are allowed to pass through the filter medium at a concentration of 0.2 to 0.5 g/m3 and a linear velocity of 5.3 cm/sec, the holding amount is 43.0 g/m2 or more from a moment when the holding amount reaches 20 g/m2 to when a moment the pressure drop reaches PD1+120 Pa, where PD1 is the pressure drop of the filter medium at the moment when the holding amount reaches 20 g/m2.
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