EP1064074A1 - Method for impregnating a porous filter material with a fluid and a filter manufactured by the method - Google Patents
Method for impregnating a porous filter material with a fluid and a filter manufactured by the methodInfo
- Publication number
- EP1064074A1 EP1064074A1 EP99934254A EP99934254A EP1064074A1 EP 1064074 A1 EP1064074 A1 EP 1064074A1 EP 99934254 A EP99934254 A EP 99934254A EP 99934254 A EP99934254 A EP 99934254A EP 1064074 A1 EP1064074 A1 EP 1064074A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- chamber
- filter material
- fluid
- pressure
- 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- Withdrawn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
- 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
- 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
- B01D39/1692—Other shaped material, e.g. perforated or porous sheets
-
- 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
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
Definitions
- the present invention relates to a method for impregnating a porous filter material with fluid according to the introduction to claim 1 and a filter manufactured according to the method.
- the type of filter saturated or impregnated with fluid that is primarily referred to here is a type that is used for filtering dust powders and particles from gases, especially from ventilation air taken up into vehicles.
- filters of the type referred to by the invention can also be used in other situations for cleaning air or other gases.
- the invention refers especially to saturated filters that can function both as particle filters, whereby the particles get caught in the filter due to their size, and/or as absorption filters, where very small particles and similar stick to the filter by the act of adhesion, i.e. primarily because the filters are saturated with fluid.
- One objective of the present invention is to achieve an even and controlled saturation of the filter material with fluid to obtain a good and stable filtration effect. This and other objectives are achieved by carrying out the saturation of the filter at an elevated temperature and at an elevated pressure in accordance with that evident in more detail from the claims that follow.
- the method for saturating filter material according to the invention is especially advantageous when it is carried out on filters that comprise several layers of the same or different materials.
- a layered, fluid-saturated filter is known from US 4 758 460 where the individual layers of filter are rolled together between two rollers or cylinders, whereby impregnation of the fluid in the filter also takes place by the fluid being applied on one of the said rollers.
- the disadvantage of this known method is obvious in that the filter material or, more specifically, the very fine threaded elements or fibres that themselves form the filter mass, are physically deformed by the action of the rollers during the actual impregnation process. This adversely affects properties of the filter mass such as the flow- through of air and the ability to collect dust powders.
- a procedure for treating filter masses comprised of thread-like expanded foam material is known from WO 95/04586. According to this document, the filter masses are saturated with a fluid of relatively high density to increase the ability of the filter to collect dust powders, whereby heat is used to reduce the viscosity of the fluid and thereby facilitate its penetration of the filter. 2
- the filter material 1 is inserted for treatment into a chamber 2 that is sealed from the surrounding atmosphere in an air-tight manner.
- the filter material 1 is heated by the action of convection heating elements arranged in the chamber (not shown in the figure), or by the action therein of microwaves generated by a oscillator unit arranged in some suitable manner in the space of the chamber.
- impregnation fluid 4 is sprayed into the chamber, in addition to which, the pressure in the chamber is increased to a predetermined level, as indicated by the arrows 5.
- the specified values of temperature and pressure have been attained in the chamber, they are maintained for a specified interval of time so that the treatment fluid has the opportunity to diffuse into and be fully taken up by the filter material 1 from different directions.
- the choice of the parameters regarding the temperature, pressure and treatment time in the chamber is decided primarily on the basis of the viscosity of the chosen impregnation fluid as well as the dimensions and density of the filter and, as such, in relation to the time needed for the fluid to diffuse fully into the porous filter mass. It should also be realised that it is beneficial for the speed of manufacture if the dispersed fluid that is sprayed into the chamber is heated to a higher temperature before it is sprayed into the chamber.
- the above method can be performed for different filter materials and different impregnation fluids, as well as for different levels of temperature, pressure and different treatment times.
- filter materials that have been used include those commercially available under the brand names "FILTREN T20, FILTREN T75 and BULPREN S90" from the company RESTICELL INTERNATIONAL.
- the composition of the filter material preferably comprises a 3-layered material mounted in a frame or similar construction where the filter is, for example, joined together at the edges by gluing and held firmly in the said frame by a net-like element of a relatively stiff material such as rigid plastic or metal.
- the impregnation fluids can, for example, comprise vegetable oils such as rape seed oil as well as polymers or other known oils.
- the use of more layers than the said three-layers can also be considered, for example, six-layered material.
- Typical heating temperatures normally lie in the range from about 75 °C to about 155 °C and the pressure can normally vary from about 20 MPa to 45 MPa, while suitable treatment times amount to about 25 to 90 seconds.
- a very good filtration effect has been obtained with a filter mass from the said manufacturer that was treated at 75 °C and a pressure of 20 MPa with both parameters maintained for a time of 25 seconds.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9800521A SE511585C2 (en) | 1998-02-23 | 1998-02-23 | Process for impregnating a porous filter material with liquid and a filter made by the process |
SE9800521 | 1998-02-23 | ||
PCT/SE1999/000211 WO1999042196A1 (en) | 1998-02-23 | 1999-02-17 | Method for impregnating a porous filter material with a fluid and a filter manufactured by the method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1064074A1 true EP1064074A1 (en) | 2001-01-03 |
Family
ID=20410256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99934254A Withdrawn EP1064074A1 (en) | 1998-02-23 | 1999-02-17 | Method for impregnating a porous filter material with a fluid and a filter manufactured by the method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1064074A1 (en) |
AU (1) | AU3282799A (en) |
NO (1) | NO313181B1 (en) |
SE (1) | SE511585C2 (en) |
WO (1) | WO1999042196A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2382315A (en) * | 2001-11-21 | 2003-05-28 | Purification Products Ltd | Filtration materials and methods for the production and use thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2961710A (en) * | 1957-01-04 | 1960-11-29 | Norman H Stark | Method for making a foamed polyurethane filter |
US4631077A (en) * | 1985-03-26 | 1986-12-23 | Pipercrosslimited | Foam plastic air filter |
IN163767B (en) * | 1985-05-29 | 1988-11-05 | Pipercross Ltd | |
US5437701A (en) * | 1993-08-05 | 1995-08-01 | S.T. Technologies, Inc. | Air filter and method of construction |
-
1998
- 1998-02-23 SE SE9800521A patent/SE511585C2/en unknown
-
1999
- 1999-02-17 AU AU32827/99A patent/AU3282799A/en not_active Abandoned
- 1999-02-17 WO PCT/SE1999/000211 patent/WO1999042196A1/en not_active Application Discontinuation
- 1999-02-17 EP EP99934254A patent/EP1064074A1/en not_active Withdrawn
-
2000
- 2000-08-22 NO NO20004185A patent/NO313181B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9942196A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU3282799A (en) | 1999-09-06 |
NO313181B1 (en) | 2002-08-26 |
SE511585C2 (en) | 1999-10-25 |
NO20004185L (en) | 2000-08-22 |
SE9800521L (en) | 1999-08-24 |
SE9800521D0 (en) | 1998-02-23 |
WO1999042196A1 (en) | 1999-08-26 |
NO20004185D0 (en) | 2000-08-22 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20000919 |
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Owner name: RACOON MILJOETEKNIK AB |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20050211 |
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