Filter media and elements

Patent metadata

Field	Value
Publication number	US-2019336897-A1
Application number	US-201916516891-A
Country	US
Kind code	A1
Filing date	Jul 19, 2019
Priority date	Mar 15, 2013
Publication date	Nov 7, 2019
Grant date	—

Abstract

Fibrous filter medium that includes a melt-blown filter layer comprising melt-blown fibers and a high-efficiency glass-containing filter layer comprising glass fibers.

First claim

What is claimed:

1 . An air filter medium comprising:
a melt-blown filter layer comprising melt-blown fibers; and a high-efficiency glass-containing filter layer comprising glass fibers and multi-component binder fibers; and a support layer,
wherein the melt-blown filter layer or the support layer or both the melt-blown filter layer and the support layer are hydrophobic;
wherein the layers are configured and arranged for placement in an air stream.

2 . The filter medium of claim 1 , wherein the melt-blown filter layer or the support layer or both the melt-blown filter layer and the support layer are coated with a hydrophobic material.

3 . The filter medium of claim 1 , wherein the melt-blown filter layer is the most upstream layer.

4 . The filter medium of claim 1 , wherein the glass-containing filter layer is positioned between the melt-blown filter layer and the support layer.

5 . The filter medium of claim 1 , wherein the multi-component binder fibers of the glass-containing filter layer comprise bicomponent fibers having a low melting point polyester sheath and a higher melting point polyester core.

6 . The filter medium of claim 1 , wherein the melt-blown filter layer is electrostatically charged.

7 . The filter medium of claim 1 comprising a support layer, wherein the support layer comprises a spunbond layer.

8 . The filter medium of claim 1 , wherein the filter medium displays a hydrostatic head of at least 10 inches (25.4 cm) of water.

9 . The filter medium of claim 1 , wherein two or more layers are laminated together.

10 . A filter medium comprising:
a melt-blown filter layer comprising melt-blown fibers having an average diameter of greater than 1.5 microns; a high-efficiency glass-containing filter layer comprising glass fibers having an average diameter of less than 2 microns, and multi-component binder fibers; and an optional support layer;
wherein the melt-blown filter layer is the most upstream layer; and wherein the filter medium is watertight.

11 . The filter medium of claim 10 , wherein the filter medium displays a hydrostatic head of at least 10 inches (25.4 cm) of water.

12 . The filter medium of claim 10 , wherein the filter medium is watertight, as measured using the Water Spray Test.

13 . The filter medium of claim 10 , wherein the filter medium comprises a support layer and further wherein the glass-containing filter layer is positioned between the melt-blown filter layer and the support layer.

14 . The filter medium of claim 10 , wherein at least one of the melt-blown filter layer, the high-efficiency glass-containing filter layer, or the optional support layer are hydrophobic.

15 . The filter medium of claim 10 , wherein at least one of the melt-blown filter layer, the high-efficiency glass-containing filter layer, or the optional support layer are coated with a hydrophobic material.

16 . The filter medium of claim 10 , wherein the multi-component binder fibers of the glass-containing filter layer comprise bicomponent fibers having a low melting point polyester sheath and a higher melting point polyester core.

17 . The filter medium of claim 10 , wherein the melt-blown filter layer is electrostatically charged.

18 . The filter medium of claim 10 comprising a support layer, wherein the support layer comprises a spunbond layer.

19 . A filter element, wherein the filter element comprises a media pack comprising a filter medium, wherein the filter medium comprises:
a melt-blown filter layer comprising melt-blown fibers; and a high-efficiency glass-containing filter layer comprising glass fibers and multi-component binder fibers; and an optional support layer; wherein the melt-blown filter layer is the most upstream layer and the glass-containing layer is positioned adjacent to the melt-blown layer, wherein the filter element comprises a cylindrical element comprising the media pack.

20 . The filter element of claim 19 , wherein the cylindrical element is axially aligned with a second cylindrical element or wherein the cylindrical element is axially aligned with a partially conical element.

Assignees

• Donaldson Co Inc

Inventors

• Gao Qiong
• Tronnes Gregory S
• Yadav Rakesh Kumar
• Madden Michael A

Classifications

• B01D2239/065

  More than one layer present in the filtering material · CPC title

• B01D2239/0654

  Support layers · CPC title

• B01D39/2024

  otherwise bonded, e.g. by resins · CPC title

• B01D2239/0681

  The layers being joined by gluing · CPC title

• B01D2239/0428

  Rendering the filter material hydrophobic · CPC title