GB2036591A - Multi layer air filter bag - Google Patents

Multi layer air filter bag Download PDF

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Publication number
GB2036591A
GB2036591A GB7848011A GB7848011A GB2036591A GB 2036591 A GB2036591 A GB 2036591A GB 7848011 A GB7848011 A GB 7848011A GB 7848011 A GB7848011 A GB 7848011A GB 2036591 A GB2036591 A GB 2036591A
Authority
GB
United Kingdom
Prior art keywords
air
filter
intermediate layer
bag
yarn
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7848011A
Other versions
GB2036591B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zellinger & Zollenberg
Original Assignee
Zellinger & Zollenberg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zellinger & Zollenberg filed Critical Zellinger & Zollenberg
Priority to GB7848011A priority Critical patent/GB2036591B/en
Publication of GB2036591A publication Critical patent/GB2036591A/en
Application granted granted Critical
Publication of GB2036591B publication Critical patent/GB2036591B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
    • 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
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter

Abstract

An air filter comprises a bag (2) the wall (3) of which is air permeable and consists of an inner layer (4) of perforate material, an intermediate layer (5) of fibrous material and an outer layer (6) of bonded material; the inner layer serving as a support for the intermediate layer whilst itself allowing substantially free passage of air, the intermediate layer serving to take up particles entrained in air flowing into the bag, and the outer layer being sufficiently dense to take up particles that have passed through the intermediate layer, and serving as a further support for the intermediate layer. The inner layer may be of nylon net material or of open weave material, the intermediate layer may be a wadding of acrylic yarn, and the outer layer of bonded polyester yarn. When used in industrial gas turbine applications the filter bag may be arranged after a pre-filter, such as an inertial louvre filter or a cleanable panel filter. <IMAGE>

Description

SPECIFICATION Air filters This invention relates to air filters.
According to the present invention there is provided an air filter for separating from an air flow particles entrained in the air flow, the filter comprising a bag for placing in an air flow with its mouth open to receive the air flow, the wall of this bag being air permeable so that the air flow can exit from the bag through the wall; that wall comprising: (a) an inner layer of perforate material, (b) an intermediate layer of fibrous material, and (c) an outer layer of bonded material; the inner layer being such as to allow substantially free passage of airtherethrough in use, and serving, in use, as a support for the intermediate layer; the intermediate layer serving, in use, to take up particles entrained in air flowing into the bag; and the outer layer being sufficiently dense to take up, in use, particular that have passed through the intermediate layer and also serving, in use, as a further support for the intermediate layer.
The intermediate layer can be a wadding of synthetic plastics yarn such as acrylic yarn of a diameter in the range 15 to 30 microns at a weight in the range of 50 to 80 grams per square metre. In a particular example the yarn diameter is 23.2 microns and the weight is 67 grams + 10% per square metre.
The inner layer can be a net of a synthetic plastics material such as nylon with a gauge and fibre diameter such that the wadding is maintained in position and intact but an air flow to be filtered can pass freely through the net. A suitable hole count for such a net is 37/8 with a fibre diameter of 40 denier.
The outer layer is of close density and can be formed entirely of bonded synthetic plastics yarn such as polyester yarn. From 40 to 60% of the yarn is of a diameter within the range 24 to 12 microns, the remainder of the yarn being of a diameter within the range 8 to 16 microns, the total weight of the material of the layer being within the range 120 to 240 grams per square metre. In a particular example using polyester yarns, 50% are of 17.5 microns diameter and 50% are of 12.4 microns diameter, the total weight of material being 180 grams per square metre t 10%.
In use an air stream to be filtered passing into the open mouth of the bag flows freely through the inner layer into and through the intermediate layer to exit via the outer layer. The intermediate layer, which is supported by the inner and outer layers, takes up particles entrained in the air stream. The outer layer is sufficiently dense to take up particles that have been able to pass through the intermediate layer.
Cleaning after use can be effected by back flushing with water or other suitable medium.
By way of example there is shown in the accompanying drawing, as an exploded and partly cutaway perspective view, an air filter comprising six bags each of which is of the form described above.
The filter has a rectangular metal frame 1 intended for mounting in a duct (not shown) through which air to be filtered is to flow. Each bag (referenced 2 in the drawing) has its wall 3 composed of an inner layer 4 which in the filter illustrated is of net material, an intermediate layer 5 of fibrous material and an outer layer 6 of bonded material each as described above.
As an alternative the perforate inner layer can be of material other than net material, for example woven material having a weave sufficiently open to permit substantially free passage of air therethrough. The mouth 7 of each bag is supported so as to be open and of rectangular form by a metal stiffener 8 inserted in a hem 9 formed around the edge of the mouth 7. From this mouth 7 the bag tapers inwardly to its other end.
The six bags 2 are secured in the frame 1 so that their open mouths 7 are side-by-side, each adjacent pair of mouth edges 10 that is not contained within the structure of the frame 1 being sanwiched by the flanges of the a U-sectioned clip 11 applied to the adjacent edges. Thus the assembled filter presents six side-by-side open mouths with no other inlet orifices for air within the perimeter of the frame 1.
Ties 12 and 13 respectively tie to one another adjacent bags, and the opposing inner surfaces of the wall of each bag.
It is to be understood that a filter such as shown in the drawing can comprise more or less than six bags, for example two, four or eight. The filters can be used alone, or as a final stage behind one or more pre-filter(s). For example, in industrial gas turbine applications, or any other application where dust loads are likely to be particularly heavy, an inertial louvre filter or a cleanable panel filter could be used as a pre-filter.
1. An air filter for separating from an airflow particles entrained in the air flow, the filter comprising a bag for placing in an air flow with its mouth open to receive the air flow, the wall of this bag being air permeable so that the airflow can exit from the bag through the wall; the wall comprising: (a) an inner layer of perforate material, (b) an intermediate layer of fibrous material, and (c) an outer layer of bonded material the inner layer being such as to allow substantially free passage of airtherethrough in use, and serving, in use, as a supportforthe intermediate layer; the intermediate layer serving, in use, to take up particles entrained in air flowing into the bag; and the outer layer being sufficiently dense to take up, in use, particles that have passed through the intermediate layer and also serving, in use, as a further supportforthe intermediate layer.
2. An air filter as claimed in claim 1 wherein the intermediate layer is made up of a synthetic plastics yarn of a diameter in the range 15 to 30 microns at a weight in the range of 50 to 80 grams per square metre of material.
3. An air filter as claimed in claim 2 wherein the yarn diameter is 23.2 microns and the weight is 67 grams 1 10% per square metre of material.
4. An air filter as claimed in claim 2 or 3 wherein the synthetic plastics yarn is acrylic yarn.
5. An air filter as claimed in any one of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Air filters This invention relates to air filters. According to the present invention there is provided an air filter for separating from an air flow particles entrained in the air flow, the filter comprising a bag for placing in an air flow with its mouth open to receive the air flow, the wall of this bag being air permeable so that the air flow can exit from the bag through the wall; that wall comprising: (a) an inner layer of perforate material, (b) an intermediate layer of fibrous material, and (c) an outer layer of bonded material; the inner layer being such as to allow substantially free passage of airtherethrough in use, and serving, in use, as a support for the intermediate layer; the intermediate layer serving, in use, to take up particles entrained in air flowing into the bag; and the outer layer being sufficiently dense to take up, in use, particular that have passed through the intermediate layer and also serving, in use, as a further support for the intermediate layer. The intermediate layer can be a wadding of synthetic plastics yarn such as acrylic yarn of a diameter in the range 15 to 30 microns at a weight in the range of 50 to 80 grams per square metre. In a particular example the yarn diameter is 23.2 microns and the weight is 67 grams + 10% per square metre. The inner layer can be a net of a synthetic plastics material such as nylon with a gauge and fibre diameter such that the wadding is maintained in position and intact but an air flow to be filtered can pass freely through the net. A suitable hole count for such a net is 37/8 with a fibre diameter of 40 denier. The outer layer is of close density and can be formed entirely of bonded synthetic plastics yarn such as polyester yarn. From 40 to 60% of the yarn is of a diameter within the range 24 to 12 microns, the remainder of the yarn being of a diameter within the range 8 to 16 microns, the total weight of the material of the layer being within the range 120 to 240 grams per square metre. In a particular example using polyester yarns, 50% are of 17.5 microns diameter and 50% are of 12.4 microns diameter, the total weight of material being 180 grams per square metre t 10%. In use an air stream to be filtered passing into the open mouth of the bag flows freely through the inner layer into and through the intermediate layer to exit via the outer layer. The intermediate layer, which is supported by the inner and outer layers, takes up particles entrained in the air stream. The outer layer is sufficiently dense to take up particles that have been able to pass through the intermediate layer. Cleaning after use can be effected by back flushing with water or other suitable medium. By way of example there is shown in the accompanying drawing, as an exploded and partly cutaway perspective view, an air filter comprising six bags each of which is of the form described above. The filter has a rectangular metal frame 1 intended for mounting in a duct (not shown) through which air to be filtered is to flow. Each bag (referenced 2 in the drawing) has its wall 3 composed of an inner layer 4 which in the filter illustrated is of net material, an intermediate layer 5 of fibrous material and an outer layer 6 of bonded material each as described above. As an alternative the perforate inner layer can be of material other than net material, for example woven material having a weave sufficiently open to permit substantially free passage of air therethrough. The mouth 7 of each bag is supported so as to be open and of rectangular form by a metal stiffener 8 inserted in a hem 9 formed around the edge of the mouth 7. From this mouth 7 the bag tapers inwardly to its other end. The six bags 2 are secured in the frame 1 so that their open mouths 7 are side-by-side, each adjacent pair of mouth edges 10 that is not contained within the structure of the frame 1 being sanwiched by the flanges of the a U-sectioned clip 11 applied to the adjacent edges. Thus the assembled filter presents six side-by-side open mouths with no other inlet orifices for air within the perimeter of the frame 1. Ties 12 and 13 respectively tie to one another adjacent bags, and the opposing inner surfaces of the wall of each bag. It is to be understood that a filter such as shown in the drawing can comprise more or less than six bags, for example two, four or eight. The filters can be used alone, or as a final stage behind one or more pre-filter(s). For example, in industrial gas turbine applications, or any other application where dust loads are likely to be particularly heavy, an inertial louvre filter or a cleanable panel filter could be used as a pre-filter. CLAIMS
1. An air filter for separating from an airflow particles entrained in the air flow, the filter comprising a bag for placing in an air flow with its mouth open to receive the air flow, the wall of this bag being air permeable so that the airflow can exit from the bag through the wall; the wall comprising: (a) an inner layer of perforate material, (b) an intermediate layer of fibrous material, and (c) an outer layer of bonded material the inner layer being such as to allow substantially free passage of airtherethrough in use, and serving, in use, as a supportforthe intermediate layer; the intermediate layer serving, in use, to take up particles entrained in air flowing into the bag; and the outer layer being sufficiently dense to take up, in use, particles that have passed through the intermediate layer and also serving, in use, as a further supportforthe intermediate layer.
2. An air filter as claimed in claim 1 wherein the intermediate layer is made up of a synthetic plastics yarn of a diameter in the range 15 to 30 microns at a weight in the range of 50 to 80 grams per square metre of material.
3. An air filter as claimed in claim 2 wherein the yarn diameter is 23.2 microns and the weight is 67 grams 1 10% per square metre of material.
4. An air filter as claimed in claim 2 or 3 wherein the synthetic plastics yarn is acrylic yarn.
5. An air filter as claimed in any one of the preceding claims wherein the inner layer is a net of a synthetic plastics material having a hole count of 37/8 and a fibre diameter of 40 denier.
6. An air filter as claimed in claim 5 wherein the synthetic plastics material is nylon.
7. An air filter as claimed in any one of the preceding claims, wherein the outer layer is of bonded synthetic plastics yarn, 40 to 60% of which is of a diameter within the range 24 to 12 microns, the remainder being of a diameter within the range 8 to 16 microns, the total weight being within the range 120 to 240 grams per square metre of material.
8. An air filter as claimed in claim 7 wherein 50% of the yarn is of 17.5 microns diameter and 50% is of 12.4 microns diameter, the total weight being 180 grams per square metre of material + 10%.
9. An air filter as claimed in claim 7 or 8, wherein the synthetic plastics yarn is polyester yarn.
10. An airfiltersubstantially as hereinbefore described with reference to the accompanying drawing.
GB7848011A 1978-12-11 1978-12-11 Multi-layer air filter bag Expired GB2036591B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7848011A GB2036591B (en) 1978-12-11 1978-12-11 Multi-layer air filter bag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7848011A GB2036591B (en) 1978-12-11 1978-12-11 Multi-layer air filter bag

Publications (2)

Publication Number Publication Date
GB2036591A true GB2036591A (en) 1980-07-02
GB2036591B GB2036591B (en) 1982-10-20

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Family Applications (1)

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Country Status (1)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589894A (en) * 1984-04-11 1986-05-20 Minnesota Mining And Manufacturing Co. Disposable filter for a vacuum cleaner
EP0273532A1 (en) * 1986-12-24 1988-07-06 Filtrete B.V. Air filter and module to be used for building up such a filter
EP0338479A1 (en) * 1988-04-18 1989-10-25 Steinbeis Gessner GmbH Dust filter bag, production and use
GB2218009A (en) * 1988-05-06 1989-11-08 Dennis Albert Georg Marshall Fluid filter
GB2238731A (en) * 1989-11-14 1991-06-12 Trevor William Foot Filter
US5080702A (en) * 1990-02-15 1992-01-14 Home Care Industries, Inc. Disposable two-ply filter
US5084076A (en) * 1988-06-28 1992-01-28 Btr Plc Filter
US5667544A (en) * 1996-04-29 1997-09-16 Aaf International Extended life filter apparatus
US5672188A (en) * 1996-05-28 1997-09-30 Aaf International High capacity filter media
US5690711A (en) * 1995-12-28 1997-11-25 Home Care Industries, Inc. Vacuum bag with reinforcement patch
EP0962722A2 (en) * 1998-06-05 1999-12-08 Saimanen, Matti Bag filter for air-conditioning equipment.
WO2001002078A1 (en) * 1999-07-02 2001-01-11 Paul Bangert Pocket filter comprising a non-woven filtering material
US7615109B2 (en) 2005-06-10 2009-11-10 Electrolux Home Care Products, Inc. Sodium bicarbonate vacuum bag inserts
CN102100993A (en) * 2009-12-22 2011-06-22 通用电气公司 Filter bag and laminated filter media
WO2011087466A3 (en) * 2008-10-22 2013-11-07 Gore Enterprise Holdings, Inc. Air pollution control filter elements for filtration systems
CN113058340A (en) * 2021-04-06 2021-07-02 安徽中电环保材料股份有限公司 Cement kiln tail is with fire-retardant dust removal filter bag and reinforcing apparatus thereof

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589894A (en) * 1984-04-11 1986-05-20 Minnesota Mining And Manufacturing Co. Disposable filter for a vacuum cleaner
EP0273532A1 (en) * 1986-12-24 1988-07-06 Filtrete B.V. Air filter and module to be used for building up such a filter
US4854953A (en) * 1986-12-24 1989-08-08 Filtrete B.V. Air filter and module to be used for building up such a filter
EP0338479A1 (en) * 1988-04-18 1989-10-25 Steinbeis Gessner GmbH Dust filter bag, production and use
DE3812849A1 (en) * 1988-04-18 1989-10-26 Gessner & Co Gmbh DUST FILTER BAG, ITS MANUFACTURE AND USE
GB2218009A (en) * 1988-05-06 1989-11-08 Dennis Albert Georg Marshall Fluid filter
GB2218009B (en) * 1988-05-06 1992-01-22 Dennis Albert Georg Marshall A fluid filter or filter assembly
US5084076A (en) * 1988-06-28 1992-01-28 Btr Plc Filter
GB2238731A (en) * 1989-11-14 1991-06-12 Trevor William Foot Filter
US5080702A (en) * 1990-02-15 1992-01-14 Home Care Industries, Inc. Disposable two-ply filter
US5690711A (en) * 1995-12-28 1997-11-25 Home Care Industries, Inc. Vacuum bag with reinforcement patch
US5667544A (en) * 1996-04-29 1997-09-16 Aaf International Extended life filter apparatus
US5672188A (en) * 1996-05-28 1997-09-30 Aaf International High capacity filter media
EP0962722A2 (en) * 1998-06-05 1999-12-08 Saimanen, Matti Bag filter for air-conditioning equipment.
EP0962722A3 (en) * 1998-06-05 2002-09-11 Matti Saimanen Bag filter for air-conditioning equipment.
WO2001002078A1 (en) * 1999-07-02 2001-01-11 Paul Bangert Pocket filter comprising a non-woven filtering material
US7615109B2 (en) 2005-06-10 2009-11-10 Electrolux Home Care Products, Inc. Sodium bicarbonate vacuum bag inserts
WO2011087466A3 (en) * 2008-10-22 2013-11-07 Gore Enterprise Holdings, Inc. Air pollution control filter elements for filtration systems
CN102100993A (en) * 2009-12-22 2011-06-22 通用电气公司 Filter bag and laminated filter media
CN113058340A (en) * 2021-04-06 2021-07-02 安徽中电环保材料股份有限公司 Cement kiln tail is with fire-retardant dust removal filter bag and reinforcing apparatus thereof

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Publication number Publication date
GB2036591B (en) 1982-10-20

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19981210