Method of filtering particulates from the air using a composite filter substrate comprising a mixture of fibers

Patent metadata

Field	Value
Publication number	US-2016175754-A1
Application number	US-201414576254-A
Country	US
Kind code	A1
Filing date	Dec 19, 2014
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A method of filtering air using a composite filter substrate having a mixture of fiber shapes and sizes layer is disclosed. The method provides improved particle cleaning efficiency.

First claim

1 . A method of filtering particulates from the air comprising the steps of:
a. providing an air filtering device in a room, wherein said device comprises
a fan; and
an air filter comprising:
a first component layer comprising:
a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from about 0.7 dpf to about 7.0 dpf;
a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from about 3 mm to about 16 mm and a non-protruded length from about 2 mm to about 14 mm and a protruded height from about 0.5 mm to about 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from about 40:60 to about 60:40; and

a second component layer comprising at least about 50% of fibers having a denier from about 0.9 dpf to about 2.0;
a plurality of connections connecting said first component layer and said second component layer; and

b. activating said fan to move about 70 to about 150 CFM of air to said air filter.

2 . The method of claim 1 , wherein said activating step comprises about 70 to about 150 CFM of air, at about 15 to about 25 Pa of pressure.

3 . The method of claim 1 , wherein said fan moves about 70 to about 100 CFM of air to said filter and the pressure drop of air through said air filter is less than about 20 Pa.

4 . The method of claim 1 , further comprising the step of activating said device for a period of at least about 20 minutes whereby greater than 40% of particulates of about 1 microns to about 10 microns are removed from the air in said room.

5 . The method of claim 1 , wherein said device further comprises a substantially air impermeable outer sleeve comprising a first open end, a second open end, and an air flow path therebetween, wherein said outer sleeve envelops said air filter around its longitudinal axis;

6 . The method of claim 5 , wherein the exit velocity of a volume of air exiting said second open end at about 0.6 to about 2.6 m/s when said device is activated.

7 . The method of claim 1 , wherein said filter is configured as an air filter bag having an open end to receive air from said fan.

8 . The method of claim 1 , wherein said substrate has a single pass filtering efficiency of greater than 15% for E1 particles, and about 20% to about 70% of E2 particles, and about 50-90% of E3 particles, and a pressure drop of less than about 20 Pa.

9 . The method of claim 1 , wherein said mixture of fibers in said first component layer comprises a first tri-lobal fiber having a denier from about 0.9 dpf to about 2.0 dpf and a second tri-lobal fiber comprising a denier from about 2.7 dpf to about 3.0 dpf.

10 . The method of claim 1 , wherein said substrate is hydroentangled.

11 . The method of claim 1 , wherein said mixture of fibers in said first component layer further comprises a multi-lobal deep-grooved shaped fiber having a denier from about 5.0 dpf to about 7.0 dpf.

12 . The method of claim 1 , wherein said mixture of fibers in said first component layer further comprises an irregular shaped fiber having a denier from about 1.0 dpf to about 2.0 dpf.

13 . The method of claim 1 , wherein said second component layer further comprises at least about 5% of fibers having a denier from about 0.0001 dpf to about 0.006 dpf.

14 . The substrate of claim 1 , wherein said substrate has a thickness from about 1 mm and about 3 mm.

15 . The substrate of claim 1 , wherein said substrate has an air flow surface area of about 0.1 m 2 to about 1 m 2 .

16 . A method of filtering particulates from the air comprising the steps of:
a. providing an air filtering device in a room, wherein said device comprises
a fan; and
an air filter bag comprising:
a first component layer comprising:
a mixture of tri-lobal fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from about 0.7 dpf to about 7.0 dpf;
a plurality of hollow protrusions; and

a second component layer comprising at least about 50% of fibers having a denier from about 0.9 dpf to about 2.0; and
a plurality of connections connecting said first component layer and said second component layer;

b. activating said fan to move from about 70 to about 150 CFM of air to said air filter bag, whereby greater than 40% of particulates of about 1 microns to about 10 microns are removed from the air in said room.

17 . The method of claim 16 , wherein said filter bag has a single pass filtering efficiency of greater than 15% for E1 particles, about 20% to about 70% of E2 particles, and about 50% to about 90% of E3 particles, and a pressure drop of less than about 20 Pa.

18 . The method of claim 16 , wherein said mixture of fibers in said first component layer comprises a first tri-lobal fiber having a denier from about 0.9 dpf to about 2.0 dpf and a second tri-lobal fiber comprising a denier from about 2.7 dpf to about 3.0 dpf.

19 - 32 . (canceled)

Assignees

• Procter & Gamble

Inventors

• Morison Pamela Marie
• Chhabra Rajeev
• Gruenbacher Dana Paul
• Monebrake David Wesley
• Wilking Susan L

Classifications

• B01D39/1623

  of synthetic origin · CPC title

• B01D46/02

  Particle separators, e.g. dust precipitators, having hollow filters made of flexible material · CPC title

• B01D46/0041 Primary

  for feeding · CPC title

• B01D2239/069

  Special geometry of layers · CPC title

• B01D46/0001

  Making filtering elements · CPC title