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US20060207932A1 - Filter element with coating for surface filtration - Google Patents

Filter element with coating for surface filtration Download PDF

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Publication number
US20060207932A1
US20060207932A1 US11/182,078 US18207805A US2006207932A1 US 20060207932 A1 US20060207932 A1 US 20060207932A1 US 18207805 A US18207805 A US 18207805A US 2006207932 A1 US2006207932 A1 US 2006207932A1
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US
United States
Prior art keywords
filter element
particles
coating
element according
main component
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.)
Abandoned
Application number
US11/182,078
Inventor
Stefan Hajek
Urs Herding
Kurt Palz
Wolfgang Raabe
Reiner Thurauf
Bernd Meindl
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Herding GmbH Filtertechnik
Original Assignee
Herding GmbH Filtertechnik
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 Herding GmbH Filtertechnik filed Critical Herding GmbH Filtertechnik
Assigned to HERDING GMBH FILTERTECHNIK reassignment HERDING GMBH FILTERTECHNIK ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAJEK, STEFAN, HERDING, URS, MEINDL, BERND, PALZ, KURT, RAABE, WOLFGANG, THUERAUF, REINER
Publication of US20060207932A1 publication Critical patent/US20060207932A1/en
Priority to US12/405,731 priority Critical patent/US8052878B2/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • 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
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
    • B01D39/2079—Other inorganic materials, e.g. ceramics the material being particulate or granular otherwise bonded, e.g. by resins
    • 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
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • 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
    • B01D39/1638—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate
    • B01D39/1653—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin
    • B01D39/1661—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin sintered or bonded
    • 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
    • B01D2239/0485—Surface coating material on particles

Definitions

  • the invention relates to an inherently stable, flow-porous filter element having a porous coating for surface filtration on its afflux surface.
  • Such filter elements are known with a number of coatings of different construction.
  • the coating of the filter element comprises:
  • the binding of the coating to the remainder of the filter element need not be effected exclusively by the adhesive, but the adhesive has a considerable share in effecting this binding.
  • the adhesive may participate in addition also in binding the particles and/or fibers of the main component to each other.
  • Preferred particles for the main component are kieselguhr particles, zeolite particles, polyvinyl pyrrolidone particles and mixtures thereof; among these, kieselguhr particles are particularly preferred.
  • Preferred fibers for the main component are ceramic fibers. The preferred substances mentioned do not have to form 100% of the main component; it is sufficient when the main component contains one or more of the substances referred to as preferred ones to a considerable share. On the other hand, it is preferred that the main component consists in essence of only one of the preferred substances mentioned or mixtures thereof. As an alternative, however, it is preferred as well to use a mixture of ceramic fibers and one type of particles referred to as preferred or several types of particles referred to as preferred.
  • the binder component may comprise or consist of water glass. However, it is preferred that the binder component is not water glass.
  • the binder component preferably is sol-based.
  • the binder component preferably comprises crosslinked SiO 2 or crosslinked SiO 2 derivative or crosslinked TiO 2 or crosslinked TiO 2 derivative or crosslinked ZrO 2 or crosslinked ZrO 2 derivative or a mixture of several of the afore-mentioned substances, Crosslinked SiO 2 is very much preferred.
  • the binder component consists in essence of one of the substances referred to as preferred or of a mixture of several of these substances.
  • SiO 2 derivative is understood to be a substance which, apart from the silicon atoms and the oxygen atoms, still contains some organic material. The same holds analogously for TiO 2 and ZrO 2 .
  • the adhesive is an organic dispersion adhesive.
  • Aqueous dispersions are particularly preferred.
  • the anti-adhesion component is polytetrafluoroethylene—in the following briefly referred to as PTFE—and/or silicone.
  • PTFE polytetrafluoroethylene
  • silicone silicone
  • very much preferred is PTFE.
  • the anti-adhesion component in essence consists of PTFE only.
  • a particularly expedient embodiment of the invention provides for the application of the coating pursuant to the sol-gel process.
  • a further expedient embodiment of the invention consists in that the coating (in essence) contains kieselguhr (only) as main component and (in essence) PTFE (only) as anti-adhesion component in a weight ratio of 1:1 to 1;2.
  • the main body of the filter element i.e. the basic structure of the filter element located underneath the coating, preferably is composed of sintered plastics particles. Polyethylene particles are particularly favorable.
  • cooling lubricant are oily liquids or emulsions of lubricating substances in particular in water that are used in mechanical or abrasive or cutting or other material-removing (e.g. spark erosion) working (machining) of workpieces.
  • the cooling lubricant as a rule is pumped in circulating manner and contains, when leaving the place of workpiece machining, abraded, cut or removed particles of the machined workpiece.
  • the filtration is performed by means of the filter element according to the invention which is simply immersed into a bath of the cooling lubricant.
  • the filtered out foreign particles adhere to the coating on the outer surface of the filter element the filtered cooling lubricant is sucked off from inside of the filter element.
  • the pump circulation is briefly interrupted at suitable intervals in time and replaced by a brief liquid stream of cleaned cooling lubricant in the opposite direction, so that the filtered out foreign particles accumulated on the outside of the coating drop down into the cooling lubricant bath and may be removed from there e.g. by means of a sludge discharge means.
  • filter elements which in essence completely filter out foreign particles of a size of more than 5 ⁇ m, more preferably more than 3 ⁇ m, from a liquid.
  • cooling lubricant the effect achieved is that the machining accuracy of the workpiece is very high as there is extremely clean cooling lubricant flowing to the machining site.
  • filter elements according to the invention for gas filtration which filter out foreign particles of a size of more than 3 ⁇ m, more preferably of a size of more than 1 ⁇ m, in essence completely.
  • the variant of the filter element according to the invention in which fibers are present as main component of the coating can be used in particularly expedient manner for gas filtration.
  • the filter element according to the invention can be used in particularly advantageous manner in situations in which resistance to increased temperatures and/or resistance to chemical attack is important.
  • the filter element may be designed to resist a temperature of permanent use of up to 180° C., or it may be designed to resist a temperature of permanent use of up to 150° C., or it may be designed to resist a temperature of permanent use of up to 120° C.
  • Chemical attack occurs e.g. in case of the afore-mentioned cooling lubricant.
  • Another application involving chemical attack is the filtering of combustion exhaust gas.
  • the filtering of combustion exhaust gas filtering for product separation from a gas stream (e.g. spray drier, drier in foodstuff industry) and materials recycling from a gas stream (e.g. catalyst in fluidized bed reactors).
  • FIG. 1 shows a sectional view of a fragment of a filter element
  • FIG. 2 shows a sectional view of a fragment of a filter element according to a another embodiment
  • the main component consists of polyethylene particles 4 that are sintered together at their contact locations 6 .
  • the pores 8 between the particles 4 have an average size of e.g. 10 to 60 ⁇ m.
  • the coating 10 of the filter element in essence consists of kieselguhr particles 12 that are bonded to each other via crosslinked SiO 2 14 and, at their contact locations with polyethylene particles 4 , are bonded to the main body by means of an organic dispersion adhesive 16 , and of PTFE particles 18 .
  • the kieselguhr particles 12 are so small that the pores between them in the average have a size of less than 3 ⁇ m.
  • the main body is produced first and thereafter the coating is applied to the afflux surface of the same either with the consistence of a rather thin liquid or with the consistence of a rather thick liquid to a pasty consistence, e.g. by spraying, rolling on, brush application, etc.
  • the coating mass to be applied in essence consists of kieselguhr particles, an SiO 2 sol, PTFE particles, organic dispersion adhesive, water and a small amount of tenside, wetting aid or foam prevention means. All of these components are available on the market without any problem.
  • the coating mass is emulsion-stable. Upon application of the coating mass, there is a sol-gel reaction, using as a rule a slightly increased temperature, and after evaporation of all water, the coating is formed in the solid aggregate state. During the sol-gel reaction and evaporation of the water, crosslinking of the SiO 2 phase and thus binding of the kieselguhr particles to each other takes place.
  • the weight ratio of kieselguhr to PTFE is in the range from 1:1 to 1:2 for obtaining particularly good results.
  • the filter element 2 shown in a fragment in FIG. 2 differs from the filter element according to FIG. 1 by a different coating 10 .
  • the finished coating 10 in essence consists of ceramic fibers 22 , crosslinked SiO 2 24 , organic dispersion adhesive 26 and PTFE particles 28 . Kieselguhr particles 12 in a smaller amount than in FIG. 1 are present as well.
  • the statements (additional components, consistence etc.) made in connection with the embodiment according to FIG. 1 are applicable again.
  • the pores between the ceramic fibers 22 have substantially the same size as the pores between the kieselguhr particles 12 in the embodiment according to FIG. 1 .
  • the ceramic fibers 22 typically have a diameter of a few ⁇ m and a length of 10 to 30 ⁇ m; chemically, they consist typically in essence of SiO 2 /Al 2 O 3 .
  • Kieselguhr is a common designation for a material consisting typically to 70 to 90% of amorphous silicic acid and to 3 to 12% of water.
  • the drawing figures In case of silicone as anti-adhesion component, the drawing figures would have a substantially unchanged appearance. In case of water glass as inorganic binder component, the drawing figures would have a substantially unchanged appearance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Filtering Materials (AREA)
  • Paints Or Removers (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

An inherently stable, flow-porous filter element (2) having a porous coating (10) for surface filtration on its afflux surface, said coating (10) comprising:
  • (a) a main component of particles (12) and/or fibers (22);
  • (b) an inorganic binder component (14; 24) binding the particles (12) and/or the fibers (22) of the main component to each other;
  • (c) an adhesive (16; 26) binding the porous coating (10) to the remainder of the filter element;
  • (d) and an anti-adhesion component (18; 28) mitigating the adhesion of filtered out material to the porous coating and facilitating cleaning of the filter element.

Description

  • The invention relates to an inherently stable, flow-porous filter element having a porous coating for surface filtration on its afflux surface.
  • Such filter elements are known with a number of coatings of different construction.
  • It is the object of the invention to make available a filter element with a surface filtration coating that is useful also for increased temperatures and/or increased resistance to chemical attack.
  • To meet this object, the coating of the filter element comprises:
    • (a) a main component of particles and/or fibers;
    • (b) an inorganic binder component binding the particles and/or fibers of the main component to each other;
    • (c) an adhesive binding the porous coating to the remainder of the filter element;
    • (d) and an anti-adhesion component mitigating the adhesion of filtered out material to the porous coating and facilitating cleaning of the filter element.
  • The binding of the coating to the remainder of the filter element need not be effected exclusively by the adhesive, but the adhesive has a considerable share in effecting this binding. On the other hand, the adhesive may participate in addition also in binding the particles and/or fibers of the main component to each other.
  • Preferred particles for the main component are kieselguhr particles, zeolite particles, polyvinyl pyrrolidone particles and mixtures thereof; among these, kieselguhr particles are particularly preferred. Preferred fibers for the main component are ceramic fibers. The preferred substances mentioned do not have to form 100% of the main component; it is sufficient when the main component contains one or more of the substances referred to as preferred ones to a considerable share. On the other hand, it is preferred that the main component consists in essence of only one of the preferred substances mentioned or mixtures thereof. As an alternative, however, it is preferred as well to use a mixture of ceramic fibers and one type of particles referred to as preferred or several types of particles referred to as preferred.
  • The binder component may comprise or consist of water glass. However, it is preferred that the binder component is not water glass. The binder component preferably is sol-based. The binder component preferably comprises crosslinked SiO2 or crosslinked SiO2 derivative or crosslinked TiO2 or crosslinked TiO2 derivative or crosslinked ZrO2 or crosslinked ZrO2 derivative or a mixture of several of the afore-mentioned substances, Crosslinked SiO2 is very much preferred. Also as regards the binder component, it is not necessary for the same to consist to 100% of one of the substances referred to as preferred or of a mixture of several of these substances. However, it is preferred that the binder component consists in essence of one of the substances referred to as preferred or of a mixture of several of these substances. SiO2 derivative is understood to be a substance which, apart from the silicon atoms and the oxygen atoms, still contains some organic material. The same holds analogously for TiO2 and ZrO2.
  • Preferably, the adhesive is an organic dispersion adhesive. Aqueous dispersions are particularly preferred.
  • Preferably, the anti-adhesion component is polytetrafluoroethylene—in the following briefly referred to as PTFE—and/or silicone. Very much preferred is PTFE. Moreover, the case very much preferred is that the anti-adhesion component in essence consists of PTFE only. A particularly expedient embodiment of the invention provides for the application of the coating pursuant to the sol-gel process.
  • A further expedient embodiment of the invention consists in that the coating (in essence) contains kieselguhr (only) as main component and (in essence) PTFE (only) as anti-adhesion component in a weight ratio of 1:1 to 1;2.
  • The main body of the filter element, i.e. the basic structure of the filter element located underneath the coating, preferably is composed of sintered plastics particles. Polyethylene particles are particularly favorable.
  • The modification of the filter element according to the invention in which particles are present as main component of the coating, can be used in particularly favorable manner for liquid filtration or for separating oil mists from a gas stream. The filtration of cooling lubricant is envisaged in particular in this regard; cooling lubricants are oily liquids or emulsions of lubricating substances in particular in water that are used in mechanical or abrasive or cutting or other material-removing (e.g. spark erosion) working (machining) of workpieces. The cooling lubricant as a rule is pumped in circulating manner and contains, when leaving the place of workpiece machining, abraded, cut or removed particles of the machined workpiece. These particles need to be filtered out before the cooling lubricant again reaches the workpiece in the circulation. Preferably, the filtration is performed by means of the filter element according to the invention which is simply immersed into a bath of the cooling lubricant. The filtered out foreign particles adhere to the coating on the outer surface of the filter element the filtered cooling lubricant is sucked off from inside of the filter element. For periodic cleaning of the filter element, the pump circulation is briefly interrupted at suitable intervals in time and replaced by a brief liquid stream of cleaned cooling lubricant in the opposite direction, so that the filtered out foreign particles accumulated on the outside of the coating drop down into the cooling lubricant bath and may be removed from there e.g. by means of a sludge discharge means.
  • On the basis of the teaching of the invention it is possible to produce filter elements which in essence completely filter out foreign particles of a size of more than 5 μm, more preferably more than 3 μm, from a liquid. In case of cooling lubricant, the effect achieved is that the machining accuracy of the workpiece is very high as there is extremely clean cooling lubricant flowing to the machining site. It is possible to produce filter elements according to the invention for gas filtration which filter out foreign particles of a size of more than 3 μm, more preferably of a size of more than 1 μm, in essence completely.
  • The variant of the filter element according to the invention in which fibers are present as main component of the coating (to a by far predominant extent or in essence as sole component) can be used in particularly expedient manner for gas filtration.
  • All in all, the filter element according to the invention can be used in particularly advantageous manner in situations in which resistance to increased temperatures and/or resistance to chemical attack is important. The filter element may be designed to resist a temperature of permanent use of up to 180° C., or it may be designed to resist a temperature of permanent use of up to 150° C., or it may be designed to resist a temperature of permanent use of up to 120° C. Chemical attack occurs e.g. in case of the afore-mentioned cooling lubricant. Another application involving chemical attack is the filtering of combustion exhaust gas. As examples for applications involving temperature resistance, there can be named the filtering of combustion exhaust gas, filtering for product separation from a gas stream (e.g. spray drier, drier in foodstuff industry) and materials recycling from a gas stream (e.g. catalyst in fluidized bed reactors).
  • The invention and preferred developments of the invention will be explained in more detail in the following by way of embodiments.
  • FIG. 1 shows a sectional view of a fragment of a filter element;
  • FIG. 2 shows a sectional view of a fragment of a filter element according to a another embodiment,
  • In the filter element 2 shown as a fragment in FIG. 1, the main component consists of polyethylene particles 4 that are sintered together at their contact locations 6. The pores 8 between the particles 4 have an average size of e.g. 10 to 60 μm.
  • The coating 10 of the filter element in essence consists of kieselguhr particles 12 that are bonded to each other via crosslinked SiO 2 14 and, at their contact locations with polyethylene particles 4, are bonded to the main body by means of an organic dispersion adhesive 16, and of PTFE particles 18. The kieselguhr particles 12 are so small that the pores between them in the average have a size of less than 3 μm. In producing the filter element 2 of FIG. 1, the main body is produced first and thereafter the coating is applied to the afflux surface of the same either with the consistence of a rather thin liquid or with the consistence of a rather thick liquid to a pasty consistence, e.g. by spraying, rolling on, brush application, etc. The coating mass to be applied in essence consists of kieselguhr particles, an SiO2 sol, PTFE particles, organic dispersion adhesive, water and a small amount of tenside, wetting aid or foam prevention means. All of these components are available on the market without any problem. The coating mass is emulsion-stable. Upon application of the coating mass, there is a sol-gel reaction, using as a rule a slightly increased temperature, and after evaporation of all water, the coating is formed in the solid aggregate state. During the sol-gel reaction and evaporation of the water, crosslinking of the SiO2 phase and thus binding of the kieselguhr particles to each other takes place.
  • The weight ratio of kieselguhr to PTFE is in the range from 1:1 to 1:2 for obtaining particularly good results.
  • The filter element 2 shown in a fragment in FIG. 2 differs from the filter element according to FIG. 1 by a different coating 10. In this case, the finished coating 10 in essence consists of ceramic fibers 22, crosslinked SiO 2 24, organic dispersion adhesive 26 and PTFE particles 28. Kieselguhr particles 12 in a smaller amount than in FIG. 1 are present as well. As regards the coating mass in the state to be applied, the statements (additional components, consistence etc.) made in connection with the embodiment according to FIG. 1 are applicable again.
  • The pores between the ceramic fibers 22 have substantially the same size as the pores between the kieselguhr particles 12 in the embodiment according to FIG. 1. The ceramic fibers 22 typically have a diameter of a few μm and a length of 10 to 30 μm; chemically, they consist typically in essence of SiO2/Al2O3.
  • Kieselguhr is a common designation for a material consisting typically to 70 to 90% of amorphous silicic acid and to 3 to 12% of water.
  • In case of silicone as anti-adhesion component, the drawing figures would have a substantially unchanged appearance. In case of water glass as inorganic binder component, the drawing figures would have a substantially unchanged appearance.

Claims (16)

1. An inherently stable, flow-porous filter element (2) having a porous coating (10) for surface filtration on its afflux surface, said coating (10) comprising:
(a) a main component of particles (12) and/or fibers (22);
(b) an inorganic binder component (14; 24) binding the particles (12) and/or the fibers (22) of the main component to each other;
(c) an adhesive (16; 26) binding the porous coating (10) to the remainder of the filter element; and
(d) an anti-adhesion component (18; 28) mitigating the adhesion of filtered out material to the porous coating and facilitating cleaning of the filter element.
2. A filter element according to claim 1, characterized in that the main component comprises one material of the group consisting of kieselguhr particles (12), zeolite particles, polyvinyl pyrrolidone particles and mixtures thereof.
3. A filter element according to claim 2, characterized in that the main component comprises kieselguhr particles (12).
4. A filter element according to claim 1, characterized in that the main component comprises ceramic fibers (22).
5. A filter element according to claim 1, characterized in that the binder component comprises one material of the group consisting of crosslinked SiO2 (14; 24), crosslinked SiO2 derivative, crosslinked TiO2 derivative, crosslinked ZrO2, crosslinked ZrO2 derivative and mixtures thereof.
6. A filter element according to claim 5, characterized in that the binder component comprises crosslinked SiO2 (14; 24).
7. A filter element according to claim 1, characterized in that the adhesive is an organic dispersion adhesive (16; 26).
8. A filter element according to claim 1, characterized in that the anti-adhesion component is polytetrafluorothylene (PTFE) (18; 28) and/or silicone.
9. A filter element according to claim 1, characterized in that the coating (10) is applied in accordance with the sol-gel process.
10. A filter element according to claim 1, characterized in that the coating (10) contains kieselguhr (12) as main component and PTFE (18; 28) as anti-adhesion component in a weight ratio of 1:1 to 1:2.
11. A filter element according to claim 1, characterized in that the main body of the filter element (2) is composed of sintered plastics particles (4).
12. The use of the filter element according to claim 1, comprising particles (12) as main component of the coating (10), for liquid filtration or for oil mist separation.
13. The use according to claim 12 for filtration of cooling lubricant.
14. The use according to claim 12, wherein foreign particles of a size of more than 5 μm are filtered out in essence completely.
15. The use of the filter element according to claim 1, comprising fibers (22) as main component of the coating (10), for gas filtration.
16. The use according to claim 15, wherein foreign particles of a size of more than 2 μm are filtered out in essence completely.
US11/182,078 2005-03-18 2005-07-15 Filter element with coating for surface filtration Abandoned US20060207932A1 (en)

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DE102005012659A DE102005012659A1 (en) 2005-03-18 2005-03-18 Filter element with coating for surface filtration
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EP (1) EP1863585B1 (en)
JP (1) JP4790006B2 (en)
KR (1) KR20080012829A (en)
CN (1) CN100584428C (en)
CA (1) CA2601058C (en)
DE (1) DE102005012659A1 (en)
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US7985344B2 (en) 2004-11-05 2011-07-26 Donaldson Company, Inc. High strength, high capacity filter media and structure
US8021455B2 (en) 2007-02-22 2011-09-20 Donaldson Company, Inc. Filter element and method
US8057567B2 (en) 2004-11-05 2011-11-15 Donaldson Company, Inc. Filter medium and breather filter structure
US8177875B2 (en) 2005-02-04 2012-05-15 Donaldson Company, Inc. Aerosol separator; and method
US8267681B2 (en) 2009-01-28 2012-09-18 Donaldson Company, Inc. Method and apparatus for forming a fibrous media
GB2493187A (en) * 2011-07-27 2013-01-30 Imerys Minerals Ltd Diatomaceous earth product
US8404014B2 (en) 2005-02-22 2013-03-26 Donaldson Company, Inc. Aerosol separator
US8721756B2 (en) 2008-06-13 2014-05-13 Donaldson Company, Inc. Filter construction for use with air in-take for gas turbine and methods
US20150182898A1 (en) * 2013-12-31 2015-07-02 Bha Altair, Llc Ridgid porous plastic filters incorporating polymeric particles and polymeric fibers
US9114339B2 (en) 2007-02-23 2015-08-25 Donaldson Company, Inc. Formed filter element
CN112569804A (en) * 2019-09-30 2021-03-30 成都易态科技有限公司 Composite porous film
US12172111B2 (en) 2004-11-05 2024-12-24 Donaldson Company, Inc. Filter medium and breather filter structure

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KR100929039B1 (en) * 2009-02-05 2009-11-26 (주) 세람 Method of forming coating layer on ceramic filter with fine pores
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