GB2307425A - Filter assembly with biocide - Google Patents

Filter assembly with biocide Download PDF

Info

Publication number
GB2307425A
GB2307425A GB9523919A GB9523919A GB2307425A GB 2307425 A GB2307425 A GB 2307425A GB 9523919 A GB9523919 A GB 9523919A GB 9523919 A GB9523919 A GB 9523919A GB 2307425 A GB2307425 A GB 2307425A
Authority
GB
United Kingdom
Prior art keywords
filter
biocide
assembly
primary
filter assembly
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Withdrawn
Application number
GB9523919A
Other versions
GB9523919D0 (en
Inventor
Fredrick Ian Wood
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.)
NATIONWIDE FILTER COMP Ltd
Original Assignee
NATIONWIDE FILTER COMP Ltd
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 NATIONWIDE FILTER COMP Ltd filed Critical NATIONWIDE FILTER COMP Ltd
Priority to GB9523919A priority Critical patent/GB2307425A/en
Publication of GB9523919D0 publication Critical patent/GB9523919D0/en
Priority to PCT/GB1996/002894 priority patent/WO1997019299A1/en
Publication of GB2307425A publication Critical patent/GB2307425A/en
Withdrawn legal-status Critical Current

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
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • 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
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B01D53/85—Biological processes with gas-solid contact
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0442—Antimicrobial, antibacterial, antifungal additives
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0464—Impregnants
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0471—Surface coating 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
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/0618—Non-woven
    • 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
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B01D2239/0668—The layers being joined by heat or melt-bonding
    • 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
    • B01D2239/0681—The layers being joined by gluing
    • 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
    • B01D2239/1291—Other parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Filtering Materials (AREA)

Abstract

A filter assembly comprises primary and secondary filters, the secondary filter being treated with a biocide and of a lower filtering efficiency than the primary. The primary filter is preferably glass fibre paper or matt, while the secondary is preferably non-woven polyester impregnated with the biocide. The filtering materials may be bonded together, and then co-pleated. A carbon containing substrate may be incorporated on the side of the primary filter remote from the secondary filter.

Description

FILTER ASSEMBLY The present invention relates to a filter intended particularly but not exclusively for use in an air-conditioning system of a building.
Filters for use in building air conditioning are typically made from filtering media comprised of glass fibre matt, synthetic fibre matt or glass fibre paper. Filters of glass fibre matt or synthetic fibre matt are generally configured as either flat pads, as bag or pocket filters, or pleated. Glass fibre paper is generally always pleated to give a high surface area.
In all cases the air conditioning filter will become biologically contaminated in use. The contamination usually takes the form of mould, fungus and bacterial growth and is particularly evident on the influent ("dirty") side of the filter. Depending on the efficiency of the filter this biological contamination can be distributed throughout the building and recent investigations have suggested that this may be a contributory factor in "sick building syndrome".
The use of higher efficiency glass fibre paper filters reduces the transmission of biological contamination but does not remove it completely.
In order to prevent biological contamination of the filter media, a biocide can be used to treat the surface. However, in practice this often results in an increase in air resistance, either immediately on application of the biocide or during use.
It is therefore an object of the invention to obviate or mitigate the above-mentioned disadvantage.
According to the present invention there is provided a filter assembly comprising a primary filter and a secondary filter of lower filtering efficiency than the primary filter wherein the secondary filter is treated with a biocide.
The filter assembly is particularly useful for use in air conditioning systems. In use the secondary filter will be located on the influent side of the primary filter.
The secondary filter serves to provide a biocidal treatment to the air being filtered before it reaches the primary filter (which provides the significant part of the filtering capacity of the assembly). Therefore mould, fungal and bacterial growth on the influent side (and consequential blockage) of the primary filter is avoided. The secondary filter also provides additional filtering capacity for the assembly (as compared to that provided by the primary filter alone).
The primary filter is preferably a pleated filter. The pleats of the primary filter are preferably set apart to allow air to flow across all the filtering media The spacing can be achieved using separate corrugated spaces, e.g. card or aluminium or by use of ribs of hot melt adhesive. It is however preferred that the spacer on one side (the influent side) is provided by the secondary filter.
The primary filter is preferably glass fibre paper but could alternatively be a glass fibre matt or synthetic fibre matt.
The secondary filter may be a non-woven material, most preferably of polyester. The secondary filter preferably has a thickness of 1 to 6mm, more preferably 1 to 3mm.
If the filter assembly is to be used where the removal of noxious gases and vapours at low concentration is required, the assembly may incorporate a carbon containing substrate, e.g. charcoal cloth, charcoal paper, charcoal impregnated form or any other media which absorbs gases and vapours. The carbon containing substrate is for preference provided on the side of the primary filter remote from the secondary filter.
A preferred filter assembly in accordance with the invention comprises a copleated assembly of a glass fibre paper and a non-woven polyester matt treated with a biocide. Such an assembly is preferably produced by bonding the polyester matt to the glass fibre paper by means of a suitable adhesive, e.g. a hot melt glue, water based PVA or latex. This composite media is then treated so as to impregnate the polyester matt with a biocide. The biocide composite media may then be pleated. If desired the copleated assembly may incorporate a carbon containing substrate for adsorption of gases and vapours. Alternatively or additionally two or more layers of biocide treated polyester matt may be incorporated in the filter assembly. In this case, the layers of biocide treated polyester matt may be on the same side as, or on either side of, the primary filter.
The biocide for use in filter assemblies in accordance with the criteria may for example be Bacterigard FS as supplied by Liquid Technology Ltd.

Claims (11)

1. A filter assembly comprising a primary filter and a secondary filter of lower filtering efficiency than the primary filter wherein the secondary filter is treated with a biocide.
2. A filter assembly as claimed in claim 1 wherein the primary filter is glass fibre paper.
3. A filter assembly as claimed in claim 2 wherein the glass fibre paper is copleated with the secondary filter.
4. A filter assembly as claimed in any one of claims 1 to 3 wherein the secondary filter is a non-woven material.
5. A filter assembly as claimed in claim 4 wherein the secondary filter is of polyester.
6. A filter assembly as claimed in any one of claims 1 to 5 wherein the secondary filter has a thickness of 1 to 6mm.
7. A filter assembly as claimed in claim 6 wherein the secondary filter has a thickness of 1 to 3mm.
8. A filter assembly as claimed in any one of claims 1 to 7 further comprising a carbon containing substrate.
9. A filter containing assembly as claimed in claim 8 wherein the carbon containing substrate is provided on the side of the primary filter remote from the secondary filter.
10. A filter assembly comprising a glass fibre paper copleated with a polyester matt treated with a biocide, the polyester matt being of lower filtering efficiency than the glass fibre paper.
11. A method of producing a filter assembly as claimed in claim 10 comprising the bonding of the polyester matt to the glass fibre paper to produce a composite media, treating the composite media so as to impregnate the polyester matt with a biocide, and then pleating the biocide treated composite media.
GB9523919A 1995-11-23 1995-11-23 Filter assembly with biocide Withdrawn GB2307425A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9523919A GB2307425A (en) 1995-11-23 1995-11-23 Filter assembly with biocide
PCT/GB1996/002894 WO1997019299A1 (en) 1995-11-23 1996-11-25 Filter assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9523919A GB2307425A (en) 1995-11-23 1995-11-23 Filter assembly with biocide

Publications (2)

Publication Number Publication Date
GB9523919D0 GB9523919D0 (en) 1996-01-24
GB2307425A true GB2307425A (en) 1997-05-28

Family

ID=10784302

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9523919A Withdrawn GB2307425A (en) 1995-11-23 1995-11-23 Filter assembly with biocide

Country Status (2)

Country Link
GB (1) GB2307425A (en)
WO (1) WO1997019299A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0989898A1 (en) * 1997-06-17 2000-04-05 Microban Products Company Antimicrobial filter cartridge
US6777103B2 (en) 2000-10-17 2004-08-17 James Hardie Research Pty Limited Fiber cement composite material using biocide treated durable cellulose fibers
AU2001242108B2 (en) * 2000-03-29 2004-11-04 Novapharm Research (Australia) Pty Ltd Biostatic filter
US7658794B2 (en) 2000-03-14 2010-02-09 James Hardie Technology Limited Fiber cement building materials with low density additives
US7815841B2 (en) 2000-10-04 2010-10-19 James Hardie Technology Limited Fiber cement composite materials using sized cellulose fibers
US7857906B2 (en) 2001-03-09 2010-12-28 James Hardie Technology Limited Fiber reinforced cement composite materials using chemically treated fibers with improved dispersibility
US7942964B2 (en) 2003-01-09 2011-05-17 James Hardie Technology Limited Fiber cement composite materials using bleached cellulose fibers
US7993570B2 (en) 2002-10-07 2011-08-09 James Hardie Technology Limited Durable medium-density fibre cement composite
US7998571B2 (en) 2004-07-09 2011-08-16 James Hardie Technology Limited Composite cement article incorporating a powder coating and methods of making same
US8133352B2 (en) 2000-10-17 2012-03-13 James Hardie Technology Limited Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials
US8209927B2 (en) 2007-12-20 2012-07-03 James Hardie Technology Limited Structural fiber cement building materials
WO2012168185A1 (en) * 2011-06-06 2012-12-13 Mann+Hummel Gmbh Antimicrobial filter medium and filter module
US8993462B2 (en) 2006-04-12 2015-03-31 James Hardie Technology Limited Surface sealed reinforced building element

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5985411A (en) * 1994-03-14 1999-11-16 Upf Corporation Self-supporting pleated filter composite

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2300368A (en) * 1995-03-06 1996-11-06 Suntory Ltd Germ-removing filter and apparatus for maintaining sterile room under sterile condition

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US4177143A (en) * 1978-10-25 1979-12-04 Nalco Chemical Company Elimination of strainer fouling in recirculating cooling water systems
JPS58101717A (en) * 1981-12-11 1983-06-17 Hitachi Ltd Filter for air-conditioner
JPS61268327A (en) * 1985-05-23 1986-11-27 Toray Ind Inc Filter material for organic polymer solution
JPS63315119A (en) * 1987-06-16 1988-12-22 Matsushita Electric Ind Co Ltd Air cleaner filter
JPS647921A (en) * 1987-06-29 1989-01-11 Matsushita Electric Ind Co Ltd Filter
GB8817144D0 (en) * 1988-07-19 1988-08-24 Protector Safety Ltd Respirator filters
JPH02198631A (en) * 1989-01-28 1990-08-07 Osaka Gas Co Ltd Laminated adsorbent and its production
US5006267A (en) * 1989-11-08 1991-04-09 The Dow Chemical Company Biocidal fluid filters

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2300368A (en) * 1995-03-06 1996-11-06 Suntory Ltd Germ-removing filter and apparatus for maintaining sterile room under sterile condition

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0989898A4 (en) * 1997-06-17 2001-11-21 Microban Products Antimicrobial filter cartridge
EP0989898A1 (en) * 1997-06-17 2000-04-05 Microban Products Company Antimicrobial filter cartridge
US8182606B2 (en) 2000-03-14 2012-05-22 James Hardie Technology Limited Fiber cement building materials with low density additives
US8603239B2 (en) 2000-03-14 2013-12-10 James Hardie Technology Limited Fiber cement building materials with low density additives
US7658794B2 (en) 2000-03-14 2010-02-09 James Hardie Technology Limited Fiber cement building materials with low density additives
US7727329B2 (en) 2000-03-14 2010-06-01 James Hardie Technology Limited Fiber cement building materials with low density additives
AU2001242108B2 (en) * 2000-03-29 2004-11-04 Novapharm Research (Australia) Pty Ltd Biostatic filter
AU2001242108B9 (en) * 2000-03-29 2005-04-14 Novapharm Research (Australia) Pty Ltd Biostatic filter
US7815841B2 (en) 2000-10-04 2010-10-19 James Hardie Technology Limited Fiber cement composite materials using sized cellulose fibers
US8268119B2 (en) 2000-10-17 2012-09-18 James Hardie Technology Limited Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials
US8133352B2 (en) 2000-10-17 2012-03-13 James Hardie Technology Limited Method and apparatus for reducing impurities in cellulose fibers for manufacture of fiber reinforced cement composite materials
US6777103B2 (en) 2000-10-17 2004-08-17 James Hardie Research Pty Limited Fiber cement composite material using biocide treated durable cellulose fibers
US7857906B2 (en) 2001-03-09 2010-12-28 James Hardie Technology Limited Fiber reinforced cement composite materials using chemically treated fibers with improved dispersibility
US7993570B2 (en) 2002-10-07 2011-08-09 James Hardie Technology Limited Durable medium-density fibre cement composite
US7942964B2 (en) 2003-01-09 2011-05-17 James Hardie Technology Limited Fiber cement composite materials using bleached cellulose fibers
US8333836B2 (en) 2003-01-09 2012-12-18 James Hardie Technology Limited Fiber cement composite materials using bleached cellulose fibers
US7998571B2 (en) 2004-07-09 2011-08-16 James Hardie Technology Limited Composite cement article incorporating a powder coating and methods of making same
US8993462B2 (en) 2006-04-12 2015-03-31 James Hardie Technology Limited Surface sealed reinforced building element
US8209927B2 (en) 2007-12-20 2012-07-03 James Hardie Technology Limited Structural fiber cement building materials
WO2012168185A1 (en) * 2011-06-06 2012-12-13 Mann+Hummel Gmbh Antimicrobial filter medium and filter module
CN103747844A (en) * 2011-06-06 2014-04-23 曼·胡默尔有限公司 Antimicrobial filter medium and filter module
US10532309B2 (en) 2011-06-06 2020-01-14 Mann+Hummel Gmbh Antimicrobial filter medium and cabin air filter

Also Published As

Publication number Publication date
GB9523919D0 (en) 1996-01-24
WO1997019299A1 (en) 1997-05-29

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)