GB2354961A - Washable electrostatic filter element - Google Patents
Washable electrostatic filter element Download PDFInfo
- Publication number
- GB2354961A GB2354961A GB0021968A GB0021968A GB2354961A GB 2354961 A GB2354961 A GB 2354961A GB 0021968 A GB0021968 A GB 0021968A GB 0021968 A GB0021968 A GB 0021968A GB 2354961 A GB2354961 A GB 2354961A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter element
- electrostatic
- filter
- cover
- electrostatic filter
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/60—Use of special materials other than liquids
- B03C3/64—Use of special materials other than liquids synthetic resins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/28—Plant or installations without electricity supply, e.g. using electrets
Landscapes
- Filtering Materials (AREA)
- Laminated Bodies (AREA)
Abstract
An electrostatic filter element comprises electrostatic filter material located between a cover or covering layers of flexible material. The electrostatic layer may be fibres mounted on or contained between sheets of scrim material. The cover layer may be a woven, non-woven or knitted fabric and is preferably polyester with an additional ply of reticulated foam. The electrostatic layer and covering layers are secured together by simultaneously ultrasonically cutting and welding the layers together thus enabling the filter element as a whole to be washed without an unacceptable degrading of the filter material.
Description
2354961 WASHABLE ELECTROSTATIC FILTER ELEMENT This invention relates to a
washable electrostatic filter element Filter materi,-d having electrostatic properties is well known. Such material comprises aitificial fibres having electrostatic properties. The fibres may typicaLly be mounted on or contained between sheets of scrim material. A typicai electrostatic filter material is av"able from Hepworth Air Pikation, Waterford Bnidge, Kentmere, Cumbria LAS 9JJ under the trade mark TECHNOSTAT. (F-Trt) Whilst such materials have well recogLdsed desirable properties as filter material they suffer from the disadvantage that they cannot readily be cleansed. In particular, the materials cannot be washed since Uimersion of the material iii a washing liquid results in unacceptable degrading of the physical characteristics of the material.
We have now found that the washable electrostatic filter element can be prod-aced if the filter material is encased in a cover of stiitable material, for example woven or non-woven fabric or ki-dited fabric. In one embodiment of the invention the cover material does not itself materially affect the filtering characteristics of the -filter material proper, but enables the filter element as a whole to be washed without an unacceptable degradation to the filter material. In an alternative embodiment the cover material not only enables the filter element as a whole to be washed without an -tina-cceptable degradation to the filter material but also enhances the filtering charactenistics of the filter The cover material is preferably a. textile material and may be a nonwaven, woven or Imitted matelial. The cover material may, for example, be of the type used M' the manufacture of garments, for example shirts. Such materials have been found to have the required physical charactenistics to fulfil the functions reqWred of thern, can be repeatedly washed without sig:nificant degradation, and 2- are readily available at reasonable cost from a number of conunercial sources. It is particularly preferred for flie material to be of a type whicb is susceptible to ultrasonic cutting and welding. In a particularly embodiment of the invention the cover rriateriil is a 100% polyester material. Accordingly, since the filter mateTial is itself typically susceptible to ultrasonic cutting and welding, a filter element may made by forming a sandwich of two layers of cover matelial with a. layer of filter material interposed, and then ultrasonically cutting and welding the three layers of material around. a peripheral region to produce a filter pad. With such a ffiter pad the three layers are bonded together around the periphery thereof to make a strong and durable structure. The resultant filter pad may be washed by hand and dried by air-drying for re- use.
VAiilst in its simplest fonn the invention prmides a filter element consisting only of three layers, namely two non-woven, woven or knitted cover layers with one layeT of electrostatic filter material therebetween, it shoul d be appreciated that the present invention is not limited to this arrangement, and if required other layers may be incorporated into the fijter element. For example a layer of reticulated foam may be included to enhance filter characteristics andJor to enhance the appearance or feel of the filter element. The invention encompasses all 3ucb arrangeinents in which the fil-ter is washable and includes at least one layer of electrostatic filter material located between cover I ayers of non-woven, woven or Imitred material.
3 CLAJMS:
1. A washable electrostatic filter element compnising: an electrostatic filter material encased in a cover of washable flexible material, the electrostatic material being secured to the cover at least around the periphery of the filter element.
A washable electrostatic filter element according to claim I wherein the filter material and the cover material are both weldable and are secured together by weldni1g.
3 A washable electrostatic filter element according to claim I or claim 2 wheTemi the filter material and. the cover material are both uILTasonically weldable and are secured together by ultrasonic welding.
4. A washable electrostatic filter element according to claim 3 wherein the filter-materi'al and the cover material are both ultrasonically cattable and are smultaneously cut and welded together.
5. A washable electrostatic filter element according to any preceding claim wherein the filter material comprises fibres mounted on or contained between sheets of scriin material.
6. A washable electrostatic filter element according to wherein the filter element includes, in addition to the filter material and the cover material, at least one additional ply to enhance the filtermig chuacteristics or the appearance or the feel of the filter element, 7. A washable electrostatic filter element according to claim 6 wherein the additional ply is of reticulated foam.
8. A washable electrostatic filter element according to any preceding clau'ri wherein the cover material is a polyester material 9. A washable electrostatic filter elemew substantially as hereinbefore described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9921122.9A GB9921122D0 (en) | 1999-09-07 | 1999-09-07 | Washable electrostatic filter element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0021968D0 GB0021968D0 (en) | 2000-10-25 |
| GB2354961A true GB2354961A (en) | 2001-04-11 |
Family
ID=10860503
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9921122.9A Ceased GB9921122D0 (en) | 1999-09-07 | 1999-09-07 | Washable electrostatic filter element |
| GB0021968A Withdrawn GB2354961A (en) | 1999-09-07 | 2000-09-07 | Washable electrostatic filter element |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB9921122.9A Ceased GB9921122D0 (en) | 1999-09-07 | 1999-09-07 | Washable electrostatic filter element |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9921122D0 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993012862A1 (en) * | 1991-12-31 | 1993-07-08 | Minnesota Mining And Manufacturing Company | Filter element for filtering fluids |
| WO1996036483A1 (en) * | 1995-05-20 | 1996-11-21 | Advanced Allergy Technologies Limited | Allergen particle exclusion and/or retention covering |
| US5651811A (en) * | 1995-02-02 | 1997-07-29 | Hmi Industries, Inc. | Filter system |
-
1999
- 1999-09-07 GB GBGB9921122.9A patent/GB9921122D0/en not_active Ceased
-
2000
- 2000-09-07 GB GB0021968A patent/GB2354961A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993012862A1 (en) * | 1991-12-31 | 1993-07-08 | Minnesota Mining And Manufacturing Company | Filter element for filtering fluids |
| US5651811A (en) * | 1995-02-02 | 1997-07-29 | Hmi Industries, Inc. | Filter system |
| WO1996036483A1 (en) * | 1995-05-20 | 1996-11-21 | Advanced Allergy Technologies Limited | Allergen particle exclusion and/or retention covering |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0021968D0 (en) | 2000-10-25 |
| GB9921122D0 (en) | 1999-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |