WO2001072397A2 - Pleated filter medium - Google Patents
Pleated filter medium Download PDFInfo
- Publication number
- WO2001072397A2 WO2001072397A2 PCT/IB2001/000324 IB0100324W WO0172397A2 WO 2001072397 A2 WO2001072397 A2 WO 2001072397A2 IB 0100324 W IB0100324 W IB 0100324W WO 0172397 A2 WO0172397 A2 WO 0172397A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter medium
- mat
- mats
- panels
- medium
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
- B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/50—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for air conditioning
Definitions
- This invention relates to a filter medium for use in air filters.
- Air filter media are widely used as a washable and replaceable components in building air conditioning plants.
- a common medium is a pleated panel of the medium in the form of a mat of fibre material. These mats of synthetic resin material are mounted in frames which are positioned in air ducting.
- the mats are located in a suitable frame to enable them to be located in airflow ducting.
- Disposable mats are also widely used and these are generally retained in cardboard frames.
- galvanized steel frames are used for both washable and disposable filter media mats.
- the mats should be made to provide progressive density to effect their best filtering and dust holding ability but single ply media are difficult to manufacture with progressive density.
- the mats also usually lack rigidity in a direction transverse to the length of the pleats and require some form of stiffening. This has heretofore been effected by the application of an excessive amount of resin impregnated into the medium which seriously reduces the filter area or the mats are wire backed with wire grids. This latter requires expensive machinery to form the grids and the product is expensive. Where used in disposable mats these grids are not easily disposed of.
- a filter medium comprising a panel of pleated fibrous material characterized in that the panel is reinforced with wire strands along the apices of the pleats.
- the fibrous material to be synthetic resin filaments, preferably suitable polyester and polypropylene resin fibre materials, and for the wire strands to be located between a pair of panels secured together.
- the invention also provides for the mats to be secured together by adhesive coating the wires and fixing the panels to the wires, by needling the panels between the wires, by stitching the panels together around the wires or by heat welding the panels to the wire.
- the panels will preferably be of different density to provide different filter capabilities.
- FIG. 1 is a diagrammatic drawing showing one form of assembly of the panels and wire;
- FIG. 2 illustrates a cross-section of the finalized filter medium;
- FIG. 3 illustrates a framed panel of filter media for insertion in an air flow duct.
- an air filter medium is manufactured by drawing panels to provide mats (2) of different density polyester and polypropylene resin fibre ) material from supply rolls (3) and (4).
- the latter will be a continuous strand mat to which about thirty percent by weight of acrylic binder has been added.
- the 3 fibrous synthetic resin materials are well known.
- the first and second stage mats (2) are joined together.
- the lengths of wire (5) are drawn from a series of rolls (6) and ) the wire (5) guided to be coated with adhesive in an adhesive bath (7). From there the wire (5) is drawn between the mats (22) at distances spaced apart determined by the depth of the pleats (8) shown in Fig 2. The mats (2) are then drawn together between rolls (9) sandwiching the wire strands (5) between them to secure the wire strands (5) to each mat and thus secure the mats (2) to each other.
- wires (5) may be needled to cause inter-engagement of the fibres from each mat (2).
- stitching may be used through the mats (2) around the wires (5).
- the composite panel will be cut to the desired length for pleating in known manner into the final filter medium.
- the pleated panels are then fixed in surrounding frames indicated at (10) in Figure 2.
- the panels made in the manner above described result in several advantages over the panels presently made and used. They are considerably cheaper to > manufacture than the conventional wire backed panels and they do not delaminate during use.
- the strands of wire (5) give the desired rigidity to the panels where it is needed ) without adversely reducing the filter area provided and this results in the panels acting effectively as filter material and, where intended to be reusable, also withstanding the rigours of removal from and replacement in the air conditioning ducting and the washing operation to remove collected contaminants from the air which has passed through the filter.
- the above embodiment is not to be considered as limiting the scope of the invention. Many variations may be made to the embodiment described.
- the fibre material is not limited to polyester and polypropylene is particularly suited for fine filtration because of the nature of the fibres which can be drawn from this material.
- the medium can be made as a single mat with the wire support attached to the apices of a single series of pleats and different filter stages of the filter may be spaced apart along the direction of air flow. This enables coarse and fine filters to be separately treated or replaced and also enables different materials to be used for these different filter stages.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
The invention concerns a filter medium of fibrous material pleated to provide a large filter area and reinforced with metal strands secured to the apices of the pleats preferably with the wire strand located between a pair of mats of polyester resin fibre materials with the mats of different densities.
Description
FILTER MEDIUM
FIELD OF THE INVENTION
This invention relates to a filter medium for use in air filters.
BACKGROUND TO THE INVENTION
Air filter media are widely used as a washable and replaceable components in building air conditioning plants. A common medium is a pleated panel of the medium in the form of a mat of fibre material. These mats of synthetic resin material are mounted in frames which are positioned in air ducting.
The mats are located in a suitable frame to enable them to be located in airflow ducting. Disposable mats are also widely used and these are generally retained in cardboard frames. However galvanized steel frames are used for both washable and disposable filter media mats.
The mats should be made to provide progressive density to effect their best filtering and dust holding ability but single ply media are difficult to manufacture with progressive density.
The mats also usually lack rigidity in a direction transverse to the length of the pleats and require some form of stiffening. This has heretofore been effected by the application of an excessive amount of resin impregnated into the medium which seriously reduces the filter area or the mats are wire backed with wire grids. This latter requires expensive machinery to form the grids and the
product is expensive. Where used in disposable mats these grids are not easily disposed of.
OBJECT OF THE INVENTION
It is an object of this invention to provide a filter medium suitable for air filters which will at least mitigate some of the disadvantages inherent in the kinds of media presently in general use.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided a filter medium comprising a panel of pleated fibrous material characterized in that the panel is reinforced with wire strands along the apices of the pleats.
Further features of the invention provide for the fibrous material to be synthetic resin filaments, preferably suitable polyester and polypropylene resin fibre materials, and for the wire strands to be located between a pair of panels secured together.
The invention also provides for the mats to be secured together by adhesive coating the wires and fixing the panels to the wires, by needling the panels between the wires, by stitching the panels together around the wires or by heat welding the panels to the wire.
Other methods of fixing the wire strands could also be used within the scope of this invention.
The panels will preferably be of different density to provide different filter capabilities.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention is described below, by way of example only, and with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatic drawing showing one form of assembly of the panels and wire; FIG. 2 illustrates a cross-section of the finalized filter medium; and
FIG. 3 illustrates a framed panel of filter media for insertion in an air flow duct.
DETAILED DESCRIPTION OF THE INVENTION
As shown in Fig 1 an air filter medium is manufactured by drawing panels to provide mats (2) of different density polyester and polypropylene resin fibre ) material from supply rolls (3) and (4).
This can be effected by having the first stage of the filter media, that is the upstream mat of an installed filter media, needled to give a low density relative to the second stage of filter media. The latter will be a continuous strand mat to which about thirty percent by weight of acrylic binder has been added. The 3 fibrous synthetic resin materials are well known.
To form the mats (2) into a handleable material for pleating and providing adequate strength against deformation when subject to an airflow to be cleaned the first and second stage mats (2) are joined together.
As shown in Fig 1 the lengths of wire (5) are drawn from a series of rolls (6) and ) the wire (5) guided to be coated with adhesive in an adhesive bath (7). From there the wire (5) is drawn between the mats (22) at distances spaced apart determined by the depth of the pleats (8) shown in Fig 2.
The mats (2) are then drawn together between rolls (9) sandwiching the wire strands (5) between them to secure the wire strands (5) to each mat and thus secure the mats (2) to each other.
Other methods of securing the wires (5) between the mats (2) can of course be used. For example the wires (5) may be needled to cause inter-engagement of the fibres from each mat (2). Further alternatively, stitching may be used through the mats (2) around the wires (5).
Also heat welding by heating the wires (5) and melting the fibres of the mats to adhere to the wires (5) can be effectively used.
) The composite panel will be cut to the desired length for pleating in known manner into the final filter medium. The pleated panels are then fixed in surrounding frames indicated at (10) in Figure 2.
The panels made in the manner above described result in several advantages over the panels presently made and used. They are considerably cheaper to > manufacture than the conventional wire backed panels and they do not delaminate during use.
Because the mats (2) are separately made to different density real effective progressive density can be achieved through the thickness of the panel.
The strands of wire (5) give the desired rigidity to the panels where it is needed ) without adversely reducing the filter area provided and this results in the panels acting effectively as filter material and, where intended to be reusable, also withstanding the rigours of removal from and replacement in the air conditioning ducting and the washing operation to remove collected contaminants from the air which has passed through the filter.
It will be appreciated that the above embodiment is not to be considered as limiting the scope of the invention. Many variations may be made to the embodiment described. For example, the fibre material is not limited to polyester and polypropylene is particularly suited for fine filtration because of the nature of the fibres which can be drawn from this material.
Further the medium can be made as a single mat with the wire support attached to the apices of a single series of pleats and different filter stages of the filter may be spaced apart along the direction of air flow. This enables coarse and fine filters to be separately treated or replaced and also enables different materials to be used for these different filter stages.
Claims
1. A filter medium comprising a panel of pleated fibrous material characterized in that the panel is reinforced with wire strands along the apices of the pleats.
2. A filter medium as claimed in claim 1 characterized in that a plurality of panels are used to form the medium.
3. A filter medium as claimed in claim 2 characterized in that the wire strands are located between pairs of panels secured together.
4. A filter medium as claimed in claim 2 in which the panels are spaced apart and each is provided with its own reinforcing wire strands.
5. A filter medium as claimed in claim 2 characterized in that the fibrous material is of synthetic resin filaments.
6. A filter medium as claimed in claim 5 characterized in that the synthetic resin filaments are suitable polyester or polypropylene resin fibre material.
7. A filter medium as claimed in claim 6 characterized in that two panels are formed into mats having different densities with the mat located upstream in use in an air flow being the mat of lower density.
8. A filter medium as claimed in claim 7 characterized in that the mat of lower density is a needled fibre mat.
9. A filter medium as claimed in claim 7 characterized in that the mat of higher density is a continuous stand mat and includes up to thirty per cent by weight of acrylic binder.
10. A filter medium as claimed in claim 7 characterized in that the two mats are adhesively secured to the wire strands.
11. A filter medium as claimed in claim 1 in which the medium is located in a metal frame.
12. A filter medium substantially as described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2001240958A AU2001240958A1 (en) | 2000-03-31 | 2001-03-08 | Filter medium |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200001640 | 2000-03-31 | ||
| ZA2000/1640 | 2000-03-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2001072397A2 true WO2001072397A2 (en) | 2001-10-04 |
| WO2001072397A3 WO2001072397A3 (en) | 2002-01-31 |
Family
ID=25588691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2001/000324 WO2001072397A2 (en) | 2000-03-31 | 2001-03-08 | Pleated filter medium |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2001240958A1 (en) |
| WO (1) | WO2001072397A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160137762A (en) * | 2015-05-21 | 2016-12-01 | 성균관대학교산학협력단 | Collect Filter Using Rolling Sheet and Method For Manufacturing the Collect Filter |
| CN115418879A (en) * | 2022-09-29 | 2022-12-02 | 石家庄辰泰滤纸有限公司 | Filter paper and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2071806A (en) * | 1936-04-06 | 1937-02-23 | Universal Air Filter Corp | Air filter for ventilating systems or apparatus |
| US2907408A (en) * | 1956-05-18 | 1959-10-06 | Cambridge Filter Mfg Corp | Filter construction |
| US4004899A (en) * | 1975-02-28 | 1977-01-25 | Alfred Giacovas | Air filter construction |
| DE3704458A1 (en) * | 1987-02-13 | 1988-08-25 | Sueddeutsche Kuehler Behr | Dust filter, in particular for motor vehicle air conditioning units |
-
2001
- 2001-03-08 AU AU2001240958A patent/AU2001240958A1/en not_active Withdrawn
- 2001-03-08 WO PCT/IB2001/000324 patent/WO2001072397A2/en active Search and Examination
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2071806A (en) * | 1936-04-06 | 1937-02-23 | Universal Air Filter Corp | Air filter for ventilating systems or apparatus |
| US2907408A (en) * | 1956-05-18 | 1959-10-06 | Cambridge Filter Mfg Corp | Filter construction |
| US4004899A (en) * | 1975-02-28 | 1977-01-25 | Alfred Giacovas | Air filter construction |
| DE3704458A1 (en) * | 1987-02-13 | 1988-08-25 | Sueddeutsche Kuehler Behr | Dust filter, in particular for motor vehicle air conditioning units |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160137762A (en) * | 2015-05-21 | 2016-12-01 | 성균관대학교산학협력단 | Collect Filter Using Rolling Sheet and Method For Manufacturing the Collect Filter |
| KR101700505B1 (en) * | 2015-05-21 | 2017-01-31 | 성균관대학교산학협력단 | Collect Filter Using Rolling Sheet and Method For Manufacturing the Collect Filter |
| CN115418879A (en) * | 2022-09-29 | 2022-12-02 | 石家庄辰泰滤纸有限公司 | Filter paper and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001072397A3 (en) | 2002-01-31 |
| AU2001240958A1 (en) | 2001-10-08 |
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