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WO2005082484A1 - Supports filtrants ondules et plisses - Google Patents

Supports filtrants ondules et plisses Download PDF

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Publication number
WO2005082484A1
WO2005082484A1 PCT/US2005/004073 US2005004073W WO2005082484A1 WO 2005082484 A1 WO2005082484 A1 WO 2005082484A1 US 2005004073 W US2005004073 W US 2005004073W WO 2005082484 A1 WO2005082484 A1 WO 2005082484A1
Authority
WO
WIPO (PCT)
Prior art keywords
media
corrugation
inch
pleated
filter element
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.)
Ceased
Application number
PCT/US2005/004073
Other languages
English (en)
Inventor
Steven A. Carter
Gary J. Rocklitz
Robert M. Rogers
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.)
Donaldson Co Inc
Original Assignee
Donaldson Co Inc
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 Donaldson Co Inc filed Critical Donaldson Co Inc
Publication of WO2005082484A1 publication Critical patent/WO2005082484A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B01D46/2414—End caps including additional functions or special forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/012—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B01D29/07—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported with corrugated, folded or wound filtering sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/111—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound 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
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/12—Pleated filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/02—Non-permanent measures for connecting different parts of the filter
    • B01D2265/022—Bayonet connecting means
    • 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
    • B01D2275/20—Shape of filtering material
    • B01D2275/201—Conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/60—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the intake of internal combustion engines or turbines

Definitions

  • the present disclosure relates to filtration media for use in fluid filtration such as air or liquid filtration.
  • the disclosure particularly concerns media which is used, in filter elements, in a pleated form.
  • the invention relates to preferred corrugation pattern or arrangement for such media.
  • Fluid filtering is conducted in a variety of systems.
  • air filtering is used for: engine air intake; gas turbine intake; and compressor air intake.
  • Liquid filtration is used for example in lube (oil) systems; hydraulic systems; and fuel systems.
  • the fluid to be filtered is passed through a filter media which operates as a barrier to passage of various contaminants, such as particulate contaminants.
  • the filtration media for such systems is selected based upon its efficiency and load characteristics, for operation as a filter media.
  • a variety of types and arrangements of media are known. In many arrangements, the media is pleated, for use. This provides a relatively large surface area of media, in a given volume.
  • Pleated media arrangements have been widely used for example in both panel filters and in coiled filters.
  • the pleated media In a panel filter arrangement, the pleated media extends in a plane, and appropriate support framework or sealing framework is applied to the media.
  • the pleated media In coiled types of arrangements, the pleated media is generally formed into a coil or tube, with the pleats extending parallel to the central axis of the formed coil or tube.
  • pleated media is subject to issues of undesirable levels of restriction increase due to pleat faces being adjacent one another.
  • the media is corrugated in a direction perpendicular to the pleat direction. Portions of these corrugations become pressed toward one another in a pleat, maintaining spacing between adjacent sections of the pleat.
  • a preferred pleated media for use in filter arrangements is provided.
  • the pleated media has corrugations extending in a direction generally perpendicular to the pleats. Preferred corrugation sizes are provided. Also provided are preferred filter element arrangements, including the media as characterized. Further, methods of use are provided.
  • Fig. 1 is a fragmentary schematic representation of pleated media.
  • Fig. 2 is a schematic perspective view of a panel filter element.
  • Fig. 3 is a schematic perspective view of a cylindrical filter element, with a portion broken away.
  • Fig. 4 is a side elevational view of the filter element of Fig. 3, with a portion broken away.
  • Fig. 5 is a schematic side elevational view of a conical filter.
  • Fig. 6 is a fragmentary perspective view of a corrugated sheet, shown folded for pleating.
  • Fig. 7 is a fragmentary schematic view of a corrugation in the sheet of Fig. 6.
  • Fig. 8 is a graph showing plots of corrugation inside height (depth) dimension B as a function of corrugation length (cycle length) A, for selected parameters as referred herein.
  • Filter media of the type of concern herein generally comprises a non- woven matt of fibers.
  • the fibers may be natural (for example cellulose), synthetic (for example polyester or polyolefm); or mixture of synthetic and natural.
  • Such media is typically on the order of about .01 inch to .02 inch (0.25 - 0.51 millimeters or mm) thick, although alternatives are possible.
  • the filter media is typically used in a pleated form, so as to increase the surface area of media within any media volume.
  • the reference numeral 1, Fig. 1, schematically represents a typical sheet of pleated media.
  • the pleated media 1 comprises a plurality of pleats 3, comprising a first set of pleat tips 3a and a second set of pleat tips 3b.
  • Each of the pleat tips 3b is positioned between a pair of pleat tips 3 a, except for pleat tips 3b at the ends of the sheet.
  • each pleat tip 3 a is positioned between two pleat tips 3b, except for any pleat tip corresponding to tip 3a, positioned at an end of the pleated media 1.
  • the pleated media 1 forms a barrier filter.
  • fluid flow is represented by arrows 5.
  • fluid directed in the direction of arrows 5 is filtered, as it passes through the pleated media 1.
  • pleat tips 3b are upstream pleat tips and pleat tips 3a are downstream pleat tips.
  • the pleat direction or extension of the pleats is generally indicated by double headed arrow 7.
  • a direction perpendicular to the pleat direction is generally referred to as the machine direction, as indicated by double headed arrow 8.
  • the term "machine direction” is generally an artifact term referring to a typical method used for processing of pleated media 1, in which the media is passed through a pleating machine in the machine direction 8, and is pleated perpendicularly to the machine direction.
  • a direction generally perpendicular to the pleat direction will sometimes be referred to as the "machine direction" without regard to the method of processing the media to form the pleats.
  • the direction perpendicular to the pleat direction will simply, alternatively, be so referenced.
  • the pleat sides 3c come closer and closer to one another.
  • adjacent pleat surfaces restrict fluid flow. This type of restriction becomes a greater concern as either or both of the following occur: the pleat population per given distance in the machine direction increases; or the depth of the pleat increases.
  • Typical pleats for air filtration are on the order of at least 0.25 inch (6.35 mm) deep, typically at 0.5 inch (12.7 mm) deep; many are 0.75 inch (19 mm) deep or greater.
  • the media is sometimes corrugated in a direction that will be perpendicular to the pleat direction. (The corrugation is typically done before pleating.) The sizes of such corrugations are discussed below. The use of such corrugations is wide spread, as described for example in U.S. patent 4, 615,804 in reference to Fig. 9, the complete disclosure of the '804 reference being incorporated herein by reference.
  • a panel filter 10 is depicted.
  • the panel filter 10 comprises media 11, pleated in a configuration 12 comprising end pleats 13.
  • the panel 10 depicted includes a frame construction 15 having a seal arrangement 16 thereon.
  • the seal arrangement 16 is generally configured to form a seal with a housing or other structure in which the panel filter 10 is positioned, for use.
  • the panel filter 10 depicted also includes a grid 18, across one surface of the panel filter arrangement
  • filter arrangement 25 is depicted.
  • the filter arrangement 25 comprises first and second end caps 26 and 27 having pleated media 29 extending therebetween.
  • the pleats of the pleated media 29 generally extend in a direction between the end caps 26, 27.
  • the particular filter arrangement 25 of Fig. 3 has an outer liner 31, shown broken away at one location, for viewing pleats.
  • the outer liner 31 shown comprises expanded metal, although a variety of alternative outer liners, including plastic ones, can be used. Indeed in some instances an outer liner is simply not used.
  • a direction perpendicular to the pleat direction is generally a circumference of the filter arrangement 25, indicated by the double headed arrow 33.
  • the particular filter arrangement 25 depicted is generally cylindrical, although alternatives are possible.
  • such elements as element 25 have an open end cap, in this instance corresponding to end cap 26, and a closed end cap, in this instance corresponding to end cap 27, although alternatives are possible.
  • end cap when used in reference to an end cap, is meant to refer to an end cap which has an open central aperture 28 to allow air flow between an interior space 29a of the filter arrangement 25 and the exterior, without passage through the media 29.
  • a closed end cap by comparison, is an end cap which has no aperture therein.
  • end caps 26, 27 may comprise polymeric material molded to the media. Alternatively they may comprise metal end caps or other preformed end caps secured to the media, with an appropriate adhesive or potting agent.
  • the particular end caps 26, 27 depicted, are molded end caps, each comprising a compressible foamed polyurethane. End cap 26 is shown with a housing seal 30, for sealing the element 25 in a housing during use.
  • the depicted seal 30 is an inside radial seal, although outside radial seals and axial seals are also possible. Attention is now directed to Fig. 4, which is a side elevational view of arrangement 25, showing end caps 26 and 27. It is noted that the element may include an imier liner extending between end caps 26, 27 along an inside of the media 29 as shown in Fig. 3 at 31, although in some arrangements such liners are optional.
  • the inside liner if used, can be metal, such as expanded metal or perforated metal, or it can be plastic.
  • the distance between the outside cylindrical surface and the inside cylindrical surface, defined by outer and inner pleat tips, is generally referenced as the pleat depth. (An analogous distance is pleat depth in panel filters, Fig. 2, or in conical filters, Fig.
  • filter arrangement 40 comprises extension of media 41 which is pleated, with pleat direction extending in the directions of arrow 42.
  • Filter arrangement 40 is somewhat conical having a wide end 44 and a narrow end 45. At wide end 44 is positioned at end cap 47, and at narrow end is positioned at end cap 48. As with the cylindrical arrangement, a variety of open and closed end caps can be used. For the specific example depicted, end cap 47 is open and end cap 48 is closed. Filter arrangement 40 includes outer support screen 50 extending between end caps 47 and 48. The particular arrangement 40 includes no inner support screen although one could be used. The arrangement 40 is generally described in detail in PCT/US 2003/33952 filed October 23, 2003, incorporated herein by reference. Pleated filter arrangements having corrugations extending perpendicularly to the pleats, can be used in arrangements such as filter arrangement 40. At 51, filter element 40 includes a seal arrangement, in this instance an axial seal, although an inside or outside radial seal is possible. Element 40 includes a non-continuously threaded mounting arrangement, 53, for mounting in a housing.
  • FIG. 6 a fragmentary perspective view of a corrugated sheet 60 is shown.
  • sheet 60 includes individual corrugations 61.
  • the corrugations can be viewed as comprising a series of alternating troughs 61a and peaks 61b.
  • the troughs 61a and peaks 61b would generally be the same, but inverted relative to one another.
  • a sheet such as corrugated sheet 60 is used to form pleated media
  • the pleats 62 are generated perpendicularly to corrugation *60, thus the pleats would extend in the general direction indicated by arrow 63.
  • sheet 60 is shown folded, to set pleats 62, although the pleats 62 are not folded closed as set they typically would be, when mounted in a pleated media arrangement.
  • Fig. 7 Attention is now directed to Fig. 7 in which an individual corrugation 70 is depicted.
  • Corrugation 70 may correspond to either one of corrugation 61a or 61b, Fig. 6. Referring to Fig.
  • the following dimensions to the media and corrugation are indicated: (a) at T - the thickness of the media is indicated; (b) at A - the individual corrugation length is depicted. A generally indicates the length for one cycle of corrugation between two adjacent valleys 70a, over a peak 70b and thus it extends between mid-points of troughs on opposite sides of corrugation 70; (c) at B - is depicted a corrugation inside height. B generally corresponds to a distance of a distortion from flat, of a surface 70a of corrugation 70, corresponding to a concave side 71 of the pleat 70.
  • (d) at C - is indicated the corrugation thickness, corresponding to T+B, or alternatively stated the distance in projection between the convex side 72 of corrugation 70, and a convex side of a next adjacent, opposite, corrugation.
  • Such arrangements have been beneficial in providing for some desirable pleat spacing, in the prior art.
  • preferred new corrugation configurations for pleated media are characterized.
  • A greater than or equal to 0.15 inch (> 3.8 mm); usually > 0.16 inch (4 mm) preferably greater than or equal to 0.175 inch (> 4.4 mm).
  • B at least 0.018 inch (0.46 mm) preferably at least 0.19 inch (0.48 mm) typically 0.019 - 0.025 inch, inclusive (0.48 mm - 0.64 mm; most preferably greater than or equal to 0.02 inch (> 0.51 mm); and typically not greater than 0.027 inch (0.69 mm).
  • C T + B.
  • Fig. 8 Some preferred corrugation patterns for such media can be derived from Fig. 8.
  • Fig. 8 1.
  • the solid (bottom) line X identified in the legend as corresponding to 3% strain, is indicative of minimal typical corrugation inside height, or depth, (B) for improved arrangements according to the present disclosure, plotted against (and reported as a function of) corrugatioxi length (cycle length), A. It is noted that the graph of Fig. 8 is presented in inches.
  • the solid line X shown in Fig. 8 represents typical (usually cellulose) media having corrugations with a corrugation length (A) of 0.1 inch (2.54 mm) to 0.38 inch (9.65 mm).
  • the lines show typical, corresponding, minimal corrugation inside heights (depths) along the line, from 0.01 inch (0.25 mni) to 0.04 inch (1 mm).
  • the hyphenated (top) line Y indicated in the legend as corresponding to 8% strain, indicates a typical, maximum inside corrugation height (depth) (B) for a typical cellulose media, as a function off corrugation cycle lengths within the same range as previously identified, i.e., 0.1 inch (2.54 mm) - 0.38 inch (9.65 mm).
  • the maximum values for B on line Y range from 0.018 inch (0.457 mm) to 0.067 inch (1.7 mm).
  • the bottom solid line X and the top hyphenated line Z represent a range of typical maximum and minimum values for the inside corrugation height (or corrugation depth) B, as a function of the typical corrugation length (or cycle) A.
  • typical useable corrugation depths B would be between the ranges indicated by the plots of the two lines, X, Y, inclusive.
  • inclusive in this context, it is meant that points on the line are included in the range. 3.
  • the middle line Z indicated in the legend as corresponding to 6% strain, defines a typical preferred upper limit on corrugation height for a typical cellulose media.
  • the plot is from a corrugation (cycle) length A of 0.1 inch (2.54 mm) to 0.38 inch (9.65 mm).
  • the inside corrugation height (depth) B for this range of cycle lengths would extend from 0.015 inch. (0.38 mm) to 0.052 inch
  • typical corrugation patterns according to the present disclosure will be provided with a corrugation (cycle) length within the range of 0.1 inch - 0.38 inch (0.25 - 9.65 mm).
  • the typical range for a corrugation inside height (B) or cycle can be determined as a function of the cycle length (corrugation length) A used, by
  • Fig. 8. Typically it will be on or between lines X and Y, usually on or between lines
  • corrugation height (depth) B will be either on the solid line X shown in Fig. 8 or above it, with an upper limit on corrugation height (depth) B, being either on the hyphenated 8% strain line Y, or below it, with corrugation depth B varying with corrugation (cycle) length A, as shown.
  • the corrugation depth B will be on the dotted line Z (6% strain) or below it, again with corrugation depth B varying corrugation length A (i.e., cycle length) as shown.
  • the lines drawn represent boundaries on or between which, typical corrugation depths (B) and cycle lengths A (corrugation length) would be selected, as shown.
  • Typical corrugation lengths (cycles) will be within the range of 0.15 inch - 0.18 inch (3.8 - 4.6 mm); and, typical inside corrugation heights (B) will be within the range of 0.018 inch - 0.023 inch (0.45 mm - 0.6 mm).
  • Corrugation depth is the average measurement taken between the peaks and valleys of four corrugations, discounting any fibers or fuzz projecting from the media surface.
  • the preferred corrugated media can be formed by passing an appropriate media between corrugation rollers.
  • the media would then be pleated, for use.
  • focus is on the media definition as it is used to form the pleated media, as opposed to a focus on the corrugation definition of the rollers used to form the media.
  • the media is typically rolled into coils, after it is corrugated, for storage, the intent is on defining the media definition as it is unrolled and used in the pleating process to form the pleated media.
  • the pleated and corrugated media can be formed with modified pleat tips according to the '804 patent referenced above. A variety of materials can be used for the media.
  • a typical media useable for air filtration is one having Frazier permeability of at least 4.0 meter/minute (13 feet/min.); a dry breaking strength in the machine direction of at least 10.0 kilogram/inch (22.0 lb./inch); a wet breaking strength in a cross direction of at least 1.8 kilogram/inch (4.0 lb./inch); and a dry burst strength of at least 124 kpa (18.0 psi).
  • alternative media can be used with arrangements according to the present disclosure.
  • a preferred media for many air filter applications would be one which has a cumulative efficiency of at least 99.95% on ISO fine dust at a dust concentration of zero visibility and 2.2 meter/min (7.2 feet/min) face velocity to 6.17 kpa (25 inch H 2 O) restriction rise.
  • alternative media can be used.
  • the preferred media as characterized above can be used in any of a variety of filter arrangements for both liquid filtering. General constructions in accord with the figures discussed above, can be used. However, the media can be applied in alternate arrangements as well.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Materials (AREA)

Abstract

La présente invention se rapporte à un élément filtrant à supports plissés, qui possède des plis (62) s'étendant dans une direction générale (63), et des ondulations (61) s'étendant perpendiculairement aux plis.
PCT/US2005/004073 2004-02-09 2005-02-09 Supports filtrants ondules et plisses Ceased WO2005082484A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US54381304P 2004-02-09 2004-02-09
US60/543,813 2004-02-09
US54380504P 2004-02-11 2004-02-11
US60/543,805 2004-02-11

Publications (1)

Publication Number Publication Date
WO2005082484A1 true WO2005082484A1 (fr) 2005-09-09

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1681087A3 (fr) * 2005-01-12 2007-10-03 AAF-McQuay Inc. Matière filtrante plissée ondulée et procédé de fabrication
WO2008039377A1 (fr) * 2006-09-27 2008-04-03 Donaldson Company, Inc. Dispositif à matériau filtrant, cartouche filtrante et procédés
DE102006062189A1 (de) 2006-12-22 2008-07-24 Dr. Mirtsch Gmbh Strukturierte Materialbahn für das Durchströmen von fluiden Medien
WO2010011910A2 (fr) 2008-07-25 2010-01-28 Donaldson Company, Inc. Ensemble de matériaux de filtration de l’air, élément de filtration, matériaux de filtration de l’air et procédés
US7753982B2 (en) 2006-02-17 2010-07-13 Baldwin Filters, Inc. Filter with drained jacket, seal indicator/lock means, and seal baffle
US7909954B2 (en) 2004-11-03 2011-03-22 Baldwin Filters, Inc. Method and apparatus for winding a filter media pack
US7931725B2 (en) 2004-11-02 2011-04-26 Baldwin Filters, Inc. Fluted filter apparatus
US7959702B2 (en) 2007-02-02 2011-06-14 Donaldson Company, Inc. Air filtration media pack, filter element, air filtration media, and methods
US7959703B2 (en) 2008-06-30 2011-06-14 Baldwin Filters, Inc. Fluted filter with integrated frame
US8048187B2 (en) 2008-06-30 2011-11-01 Baldwin Filters, Inc. Filter frame attachment and fluted filter having same
US8206625B2 (en) 2004-11-02 2012-06-26 Baldwin Filters, Inc. Filter element
GB2495825A (en) * 2011-10-17 2013-04-24 Gen Electric Pleated filter and methods for reducing can velocity
US8673043B2 (en) 2010-03-17 2014-03-18 Baldwin Filters, Inc. Fluid filter
DE102014000083A1 (de) * 2014-01-02 2015-07-02 Dr. Mirtsch Gmbh Verfahren zum partiell dreidimensionalen Strukturieren einer Materialbahn und zum sekundären Umformen der Materialbahn, dreidimensional strukturierte Materialbahn mit ebenen Teilbereichen, Verwendung derselben und eine Vorrichtung zur Herstellung derselben
US9108394B2 (en) 2008-08-06 2015-08-18 Donaldson Company, Inc. Method of making a Z-media having flute closures
TWI498513B (zh) * 2012-01-30 2015-09-01 Mitsubishi Hitachi Power Sys Exhaust treatment device
US9433884B2 (en) 2007-06-26 2016-09-06 Donaldson Company, Inc. Filtration media pack, filter element, and methods
US9545593B2 (en) 2007-11-01 2017-01-17 Baldwin Filters, Inc. Winding core pressure relief for fluted filter
USD786935S1 (en) 2015-11-20 2017-05-16 Baldwin Filters, Inc. Filter element
US9757676B2 (en) 2006-12-06 2017-09-12 Baldwin Filters, Inc. Method and apparatus for winding a filter element
US9782702B2 (en) 2014-05-22 2017-10-10 Pall Corporation Filter assemblies, filter elements, and methods for filtering liquids
US9808752B2 (en) 2008-02-04 2017-11-07 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media
US9839866B2 (en) 2014-05-30 2017-12-12 Pall Corporation Filter elements and methods for filtering fluids
US9890750B2 (en) 2004-11-02 2018-02-13 Baldwin Filters, Inc. Filter element
EP2528675B1 (fr) 2010-01-25 2018-04-18 Donaldson Company, Inc. Supports de filtration plissés ayant des cannelures coniques
US10040020B2 (en) 2006-12-06 2018-08-07 Baldwin Filters, Inc. Fluid filter apparatus having filter media wound about a winding frame
US10363513B2 (en) 2009-08-03 2019-07-30 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media having tapered flutes
US10682597B2 (en) 2016-04-14 2020-06-16 Baldwin Filters, Inc. Filter system
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