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US 12,678,723 B2Granted
Air filter medium, filter pack, air filter unit, and method for producing the same
AssigneeDaikin Industries, Ltd.
InventorsYoshiyuki Shibuya, Kunihiko Inui, Seigo Yamamoto, Hideyuki Kiyotani, Toshihiro Kanda
Life of this patent
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Abstract
An air filter medium having a large thickness and a low filling factor, a filter pack, an air filter unit, and methods for producing the air filter medium, the filter pack, and the air filter unit are provided. The air filter medium includes a fluororesin porous film having a portion with a filling factor of 3.5% or less, and the portion with a filling factor of 3.5% or less has a thickness of 45 μm or more.
Claims18
An air filter medium comprising:
- a fluororesin porous film having a portion with a filling factor of 3.5% or less and with an average pore diameter of 4.82 μm or more and 15.99 μm or less,
- wherein the portion with the filling factor of 3.5% or less and with the average pore diameter of 4.82 μm or more and 15.99 μm or less has a thickness of 150 μm or more and 386.0 μm or less.
An air filter medium comprising,
- a fluororesin porous film having a portion with a filling factor of 3.5% or less, with a pressure loss of 49 Pa or less when air is passed through the portion at a flow velocity of 5.3 cm/s, and with a collection efficiency of polyalphaolefin particles having a particle size of 0.3 μm at which air containing the polyalphaolefin particles is passed through the portion at a flow velocity of 5.3 cm/s is 99.277725% or more, wherein
- the portion has a thickness of 150 μm or more and 386.0 μm or less.
Dependencies are inferred from the claim text.