Filter Medium and Filter Element with a Filter Medium

Patent metadata

Field	Value
Publication number	US-2016288033-A1
Application number	US-201615186449-A
Country	US
Kind code	A1
Filing date	Jun 18, 2016
Priority date	Dec 18, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

A filter medium ( 10 ) has a first layer of media ( 12 ), a second layer of media ( 18 ), and at least one third layer of media ( 20 ). The second layer of media ( 18 ) is arranged behind the first layer of media ( 12 ) in the intended flow direction ( 16 ) of the filter medium, and the third layer of media ( 20 ) is arranged behind the second layer of media ( 18 ) in the intended flow direction ( 16 ) of the filter medium. The first layer of media ( 12 ) has fibers, and the second layer of media ( 18 ) has nanofibers. Also disclosed is a filter element ( 50 ) which has such a filter medium ( 10 ) and the use of such a filter medium ( 50 ) as a fuel filter.

First claim

What is claimed is:

1 . A filter medium, comprising:
a first layer of media; a second layer of media; and at least one third layer of media; wherein the second layer of media is arranged behind the first layer of media ( 12 ) in an intended flow direction ( 16 ) of the filter medium; wherein the third layer of media is arranged behind the second layer of media ( 18 ) in the intended flow direction ( 16 ) of the filter medium; wherein the first layer of media has fibers, and wherein the second layer of media ( 18 ) has nanofibers.

2 . The filter medium according to claim 1 , wherein
the second layer of media has nanofibers with an average fiber diameter between 50 nm and 1,000 nm, and/or the second layer of media is formed at least for the most part from nanofibers with an average fiber diameter between 50 nm and 1000 nm.

3 . The filter medium according to claim 1 , wherein
the second layer of media has a weight per unit area between 0.05 and 10 g/m 2 .

4 . The filter medium according to claim 1 , wherein
the second layer of media is formed from electrospun nanofibers.

5 . The filter medium according to claim 1 , wherein
the second media layer is formed on the first layer or the third layer as a coating of nanofibers.

6 . The filter medium according to claim 1 , wherein
an average fiber diameter of the first layer of media is between 0.2 μm and 4 μm.

7 . The filter medium according to claim 1 , wherein
at least 50% of the fibers in the first layer of media are glass fibers.

8 . The filter medium according to claim 1 ,
wherein the first layer of media has a gradient structure of the packing density of the fibers with an increasing packing density in the intended flow direction.

9 . The filter medium according to claim 1 , wherein
the third layer of media has at least 50% of fibers formed as continuous fibers.

10 . The filter medium according to claim 1 , wherein
the third layer of media is formed from a meltblown layer, a spunbond layer or a cellulose layer.

11 . The filter medium according to claim 1 , wherein
the third layer of media includes at least one support stratum.

12 . The filter medium according to claim 1 , wherein
the third layer of media has a degree of deposition for particles having a particle size greater than 4 μm which is lower than a degree of precipitation for particles having a particle size greater than 4 μm of the first layer of media.

13 . The filter medium according to claim 1 , wherein
the third layer of media has a degree of precipitation for particles having a particle size greater than 4 pm, which is less than 60%.

14 . The filter medium according to claim 1 , wherein
the third layer of media has a thickness of at least 0.15 mm and at most 1.5 mm.

15 . The filter medium according to claim 1 , wherein
fibers in the third layer of media have an average fiber diameter of at least 1 μm and a maximum of 40 μm.

16 . The filter medium according to claim 1 , further comprising
a fourth layer of media; wherein the fourth layer of media is arranged before the first layer of media in the intended flow direction and has a degree of deposition for particles having a particle size greater than 4 pm which is less than a degree of deposition of the first layer of media.

17 . A filter element, comprising
a filter medium according to claim 1 ; wherein the filter medium is a folded filter medium.

18 . The filter element according to claim 17 ,
wherein the filter element is a fuel filter of an internal combustion engine.

Assignees

• Mann & Hummel Gmbh

Inventors

• Reyinger Jochen
• Neubauer Sebastian
• Klein Martin
• Spelter Lars

Classifications

• B01D2239/0631

  Electro-spun · CPC title

• B01D35/005

  Filters specially adapted for use in internal-combustion engine lubrication or fuel systems · CPC title

• B01D2239/1291

  Other parameters · CPC title

• B01D2239/1233

  Fibre diameter · CPC title

• B01D2239/0654

  Support layers · CPC title