Air filter
AssigneesToyo Roki Seizo Kabushiki Kaisha, Awa Paper Mfg. Co., Ltd.
InventorsAtsushi Suzuki, Toshinori Oba, Norihiko Matsushita, Katsumi Suzuki, Takeo Jo
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Abstract
There is provided an air filter, which has a long lifetime and permits to capture effectively carbon particles and reduce costs. The air filter has the first filter layer 11 impregnated with oil and the second filter layer 12, which is provided on the downstream side of the first filter layer 11 and serves as a lipophobic layer having an oil-repellent property. The filter material of the first filter layer 11 has a higher density than the filter material of the second filter material 12.
Claims20
An air filter comprising:
- a first filter layer formed of a first filter paper material having a predetermined density, said first filter layer being impregnated with oil;
- and
- a second filter layer provided on a downstream side of said first filter layer so as to be independent from said first filter layer, said second filter layer being formed of a second filter paper material having a lower density than said predetermined density of said first filter layer, said second filter layer being impregnated over its entirety with an oil-repellent agent.
A air filter, comprising:
- a first layer of a first filter paper impregnated with oil;
- and
- a second layer of a second filter paper placed in a downstream air direction adjacent the first layer,
- a density of the first filter paper being greater than a density of the second filter paper,
- the second layer formed as an oil-repellent lipophobic layer over an entire thickness of the second layer.
A air filter, comprising:
- a first layer of a first filter paper impregnated with oil;
- a second layer of a second filter paper placed in a downstream air direction contacting the first layer;
- and
- a hot-melt adhesive layer binding the first layer with the second layer, the adhesive layer penetrating a downstream side of the first layer and an upstream side of the second layer,
- a density of the first filter paper being greater than a density of the second filter paper,
- the second layer formed as an oil-repellent lipophobic layer over an entire thickness of the second layer.
Dependencies are inferred from the claim text.