US20050217226A1 - Pleated aligned web filter - Google Patents

Pleated aligned web filter Download PDF

Info

Publication number
US20050217226A1
US20050217226A1 US10/818,091 US81809104A US2005217226A1 US 20050217226 A1 US20050217226 A1 US 20050217226A1 US 81809104 A US81809104 A US 81809104A US 2005217226 A1 US2005217226 A1 US 2005217226A1
Authority
US
United States
Prior art keywords
web
row direction
fibers
filter element
transverse
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
US10/818,091
Other languages
English (en)
Inventor
Douglas Sundet
Rahul Shah
John Brandner
Tien Wu
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.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34961955&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20050217226(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Priority to US10/818,091 priority Critical patent/US20050217226A1/en
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRANDNER, JOHN M., SJAH, RAHUL, SUNDET, DOUGLAS C., WU, TIEN T.
Priority to RU2006133410/12A priority patent/RU2006133410A/ru
Priority to KR1020067020942A priority patent/KR20070004823A/ko
Priority to DE200560015690 priority patent/DE602005015690D1/de
Priority to CNB2005800107050A priority patent/CN100553734C/zh
Priority to JP2007506196A priority patent/JP2007531617A/ja
Priority to PCT/US2005/007538 priority patent/WO2005102497A1/en
Priority to EP05724959A priority patent/EP1732664B1/en
Priority to AT05724959T priority patent/ATE437689T1/de
Priority to BRPI0509031-8A priority patent/BRPI0509031A/pt
Publication of US20050217226A1 publication Critical patent/US20050217226A1/en
Priority to US11/457,933 priority patent/US7622063B2/en
Priority to US12/553,424 priority patent/US8142538B2/en
Abandoned legal-status Critical Current

Links

Images

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
    • B01D39/14—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
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/05—Methods of making filter
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24686—Pleats or otherwise parallel adjacent folds
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/643—Including parallel strand or fiber material within the nonwoven fabric

Definitions

  • This invention pertains to pleated filters that have fiber alignment in the direction of web formation.
  • meltblown nonwoven fibrous webs are used for a variety of purposes including filtration (e.g., flat web and pleated filters), insulation, padding and textile substitutes.
  • References relating to meltblown nonwoven fibrous webs include U.S. Pat. No. 3,959,421 (Weber et al.), U.S. Pat. No. 4,622,259 (McAmish et al.), U.S. Pat. No. 5,075,068 (Milligan et al.), U.S. Pat. No. 5,141,699 (Meyer et al.), U.S. Pat. No. 5,405,559 (Shambaugh), U.S. Pat. No.
  • Nonwoven web manufacture typically involves deposition of fibers on a moving collector surface. Perhaps partly as a consequence of this motion, the collected web may exhibit a small degree of fiber alignment in the machine direction, and to a small extent some anisotropic physical properties (e.g., tensile strength) in the machine and transverse directions. Nonwoven web manufacturers often strive however to make products having well-balanced and generally isotropic physical properties.
  • the present invention provides, in one aspect, a filter element having rows of folded pleats comprising a nonwoven filtration web of thermoplastic fibers a majority of which are aligned at 90° ⁇ 20° with respect to the row direction.
  • FIG. 1 is a schematic side view of a meltblowing apparatus for making nonwoven webs having fibers substantially aligned in the machine direction.
  • FIG. 2 is an overhead view of a vacuum collector for use in the apparatus of FIG. 1 .
  • FIGS. 3-6 are radar plots showing fiber alignment.
  • FIG. 7 is a perspective view of pleated filtration media.
  • FIG. 8 is a perspective view, partially in section, of a pleated filter mounted in a frame.
  • FIG. 9 is a graph showing filter pressure drop vs. air velocity.
  • FIG. 10 is a schematic illustration of an apparatus for making the disclosed pleated filters.
  • filtration web refers to a porous web capable of removing at least particles having an average particle diameter greater than 10 ⁇ m from a stream of air flowing at a 0.5 m/sec face velocity at an initial pressure drop no greater than about 50 mm H 2 O.
  • the phrase “attenuating the filaments into fibers” refers to the conversion of a segment of a filament into a segment of greater length and smaller diameter.
  • meltblowing refers to a method for forming a nonwoven web by extruding a fiber-forming material through a plurality of orifices to form filaments while contacting the filaments with air or other attenuating fluid to attenuate the filaments into fibers and thereafter collecting a layer of the attenuated fibers.
  • meltblown web refers to a nonwoven web made using meltblowing.
  • nonwoven die refers to a die for use in meltblowing.
  • meltblown fibers and “blown microfibers” refer to fibers made using meltblowing.
  • machine direction when used with respect to a meltblown web or to a meltblowing apparatus for meltblown web formation refers to the in-plane direction of web fabrication.
  • transverse direction when used with respect to a meltblowing apparatus or a meltblown web refers to the in-plane direction perpendicular to the machine direction.
  • row direction when used with respect to a pleated filter element refers to a direction generally parallel to the pleat ridges and valleys in a filter element having a folded structure with parallel, generally sharp-edged creases, and to a direction generally parallel to the pleat crowns and base regions in a filter element having a corrugated structure with parallel, generally smooth undulations.
  • self-supporting when used with respect to a web refers to a web having sufficient coherency and strength so as to be drapable and handleable without substantial tearing or rupture
  • pleated filter when used with respect to a pleated filter refers to a filter whose pleats have sufficient stiffness so that they do not collapse or bow excessively when subjected to the air pressure typically encountered in forced air ventilation systems.
  • polymers may be employed to make the disclosed aligned fiber webs.
  • Representative polymers are thermoplastic, extrudable and can be processed using a meltblowing apparatus, and include polyolefins such as polyethylene, polypropylene or polybutylene; polyamides; polyesters such as polyethylene terephthalate; and other materials that will be familiar to those skilled in the art. Polyolefins are particularly preferred.
  • sorbent particles can be added to the nonwoven webs if desired.
  • Representative sorbent particles are disclosed in U.S. Pat. No. 3,971,373 to Braun, U.S. Pat. No. 4,429,001 to Kolpin et al. and U.S. Pat. No. 6,102,039 to Springett et al.
  • Activated carbon and alumina are particularly preferred sorbent particles.
  • Mixtures of sorbent particles can be employed, e.g., to absorb mixtures of gases, although in practice to deal with mixtures of gases it may be better to fabricate a multilayer pleated filter employing separate sorbent particles in the individual layers.
  • Air is an especially convenient fluid for both purposes.
  • the remainder of this application will discuss the use of air, sometimes referred to as “primary air” or as “secondary quench air” as the context may require.
  • primary air or as “secondary quench air” as the context may require.
  • secondary quench air e.g., carbon dioxide, nitrogen or water
  • FIG. 1 shows a schematic side view of meltblowing apparatus 10 .
  • Molten polymer enters meltblowing die 12 through inlet 14 and passes through die cavity 16 .
  • Small orifices (not shown in FIG. 1 ) in die tip 18 cause the molten polymer to form filaments 22 upon exiting die 12 .
  • Primary air supplied through inlets 20 impinges upon the filaments 22 and attenuates them into fibers 24 .
  • Fibers 24 land on flat collector 26 and form nonwoven web 28 which can be drawn away from collector 26 in the direction of web formation (viz., the machine direction) 30 by a suitable take-up apparatus (not shown in FIG. 1 ).
  • the oscillations can have a very large machine direction amplitude, e.g., more than one fourth the die to collector distance (“DCD”) and in some instances more than half the DCD.
  • DCD die to collector distance
  • the oscillations may occur regularly, may have increasing amplitude en route to the collector, and may have a wavelength for one complete cycle that is less than the distance from the secondary quench air outlets to the collector. Preferably the distance from the secondary quench air outlets to the collector is not overly long.
  • the fibers may in some instances exhibit a whip-like action at their peak machine direction displacement en route to the collector, and may momentarily move towards the meltblowing die rather than always moving toward the collector. Apparent fiber breakage can sometimes be seen as such whip-like action occurs.
  • Web 28 can be pleated as is, or further treated.
  • a heat treatment e.g., annealing
  • Heat treatments may however make it more difficult to tease fibers from the web, as the fibers may tend to fracture and the web may have greater inter-fiber bonding or entanglement.
  • Preferred annealing times and temperatures will depend on various factors including the polymeric fibers employed. As a general guide, annealing times and temperatures of about 100° C. up to the polymer melting point for a time less than about 10 minutes are preferred.
  • a vacuum can optionally be drawn thorough orifice 34 to assist in consolidating web 28 .
  • Overdensification e.g., using calendaring
  • Electric charge can be imparted to the fibers by contacting them with water as disclosed in U.S. Pat. No. 5,496,507 to Angadjivand et al., corona-treating as disclosed in U.S. Pat. No. 4,588,537 to Klasse et al., hydrocharging as disclosed, for example, in U.S. Pat. No. 5,908,598 to Rousseau et al. or tribocharging as disclosed in U.S. Pat. No. 4,798,850 to Brown.
  • Additives may also be included in the fibers to enhance the web's filtration performance, mechanical properties, aging properties, surface properties or other characteristics of interest.
  • Representative additives include fillers, nucleating agents (e.g., MILLADTM 3988 dibenzylidene sorbitol, commercially available from Milliken Chemical), UV stabilizers (e.g., CHIMASSORBTM 944 hindered amine light stabilizer, commercially available from Ciba Specialty Chemicals), cure initiators, stiffening agents (e.g., poly(4-methyl-1-pentene)), surface active agents and surface treatments (e.g., fluorine atom treatments to improve filtration performance in an oily mist environment as described in U.S. Pat. Nos. 6,398,847 B1, 6,397,458 B1, and 6,409,806 B1 to Jones et al.). The types and amounts of such additives will be apparent to those skilled in the art.
  • the completed webs may have a variety of effective fiber diameter (“EFD”) sizes, basis weights and solidity (ratio of polymer volume to web volume) values.
  • EFDs are about 8 to about 25, more preferably about 10 to about 25 ⁇ m.
  • Preferred basis weights are about 50 to about 100 g/m 2 .
  • Preferred solidity values are about 5 to about 15%.
  • the disclosed webs have substantial machine direction (direction of motion or direction of web formation) fiber alignment.
  • As a general guide for pleated filters made from polypropylene webs preferably about 55 to about 90% of the fibers are aligned at 90° ⁇ 20° with respect to the row direction, and more preferably about 70 to about 85%.
  • the numbers may be lower or higher.
  • As a general guide for pleated filters made from polyethylene terephthalate webs preferably about 51 to about 80% of the fibers are aligned at 90° ⁇ 20° with respect to the row direction, and more preferably about 60 to about 80%.
  • Very highly aligned webs can be formed, e.g., webs having at least 80% of the collected fibers aligned at 90° ⁇ 20° with respect to the row direction.
  • the disclosed webs have one or more anisotropic mechanical properties.
  • One class of preferred webs may have at least a 2:1 ratio of the in-plane tensile strength in the direction transverse to the row direction to the tensile strength in the row direction using a 50 mm gauge length, and more preferably at least a 3:1 ratio.
  • Another class of preferred webs may have at least a 2:1 ratio of the in-plane Taber Stiffness in the direction transverse to the row direction to the Taber Stiffness in the row direction, and more preferably at least about 2.2:1.
  • the disclosed meltblowing apparatus It is possible to construct the disclosed meltblowing apparatus and operate it under conditions that do not provide the disclosed aligned fiber webs, or under conditions that will provide weak webs poorly suited to filtration. For example, if insufficient secondary quench air is employed then the above-described oscillations may not occur and the fibers may not align substantially in the machine direction. Excessively high quench velocities may provide loftier webs having less interfiber bonding and entanglement and improved filtration performance, but having severely diminished mechanical properties such as stiffness and pleatability. Thus it generally will be preferable to employ secondary quench air within a range of mass flow ratios or volumes.
  • a ratio of about 500 to about 2000 grams of secondary quench air per gram of extruded polymer may be preferred, as may be secondary quench air outlet velocities of about 15 to about 60 m/sec. These ranges may need to be adjusted empirically based on factors such as the meltblowing die and polymer employed, the target basis weight, target web solidity and target extent of fiber alignment and mechanical property anisotropy. Pulsation of the secondary quench air may also be employed but appears not to be necessary. Instead it appears to be better simply to adjust the secondary quench air flow upwards or downwards to a steady state value that provides collected webs having the desired final properties.
  • FIG. 2 shows a schematic overhead view of collector 26 .
  • Die 12 is positioned close to the leading edge of collector 26 , but can be moved downweb to positions such as position 36 in order to alter the properties of web 28 .
  • Such repositioning may for example provide webs having reduced Taber Stiffness.
  • a conventional cylindrical collector surface is employed instead of a flat collector then it usually will be more difficult to obtain webs whose fibers are substantially aligned in the machine direction, and the webs may have lower Taber Stiffness.
  • Excessive DCD lengths or excessive distances from the secondary quench air outlets to the collector may also be detrimental, e.g., by causing too many oscillations en route to the collector, excessive fiber attenuation or excessive fiber breakage.
  • the nonwoven filtration media can be further stiffened if desired using a variety of techniques.
  • an adhesive can be employed to laminate together layers of the filter media, e.g., as described in U.S. Pat. No. 5,240,479 (Bachinski).
  • the filter media can also be made using conjugate fibers, e.g., as described in U.S. Pat. No. 5,709,735 (Midkiff et al.). Further details regarding the nonwoven filtration media can also be found in copending U.S. patent application Ser. No. ______(attorney docket no. 58214US002), filed even date herewith and entitled ALIGNED FIBER WEB, the disclosure of which is incorporated herein by reference.
  • FIG. 7 shows pleated filter media 100 having rows of pleats 102 .
  • the rows are aligned in the transverse direction, and the substantially-aligned fibers in web 100 are aligned at 90° ⁇ 20° with respect to the row direction, that is, at ⁇ 20° with respect to the machine direction.
  • FIG. 8 shows pleated filter media 100 and an expanded metal support 110 mounted in frame 112 to provide filter 114 .
  • the increased stiffness of pleated media 100 and the substantial machine direction fiber alignment transverse to the row direction both are believed to contribute to increased resistance of pleated media 100 to pleat deformation at high filter face velocities.
  • FIG. 10 shows an apparatus 120 for making the disclosed pleated filters.
  • Aligned filtration media 122 is typically provided on a continuous roll 124 .
  • Media 122 may be slit to a desired width at slitting station 126 .
  • Media 122 may optionally be preheated at a heating station 128 to perform annealing or to make web 122 more flexible while passing into or through apparatus 120 .
  • the heating station 128 is an infrared heater.
  • a reinforcing member 130 is applied to a rear face 132 of media 122 at location 134 .
  • Reference to the rear face 132 (or to the front face 164 , discussed below) is for purposes of description only and does not indicate a required airflow orientation of the completed pleated filter.
  • the reinforcing member 130 may be positioned upstream or downstream in the air flow.
  • Reinforcing member 130 may be applied in a variety of positions, e.g., as one or more continuous strips oriented in the machine direction 136 , as discrete reinforcing members oriented transverse to the machine direction 136 , or in other configurations that will be familiar to those skilled in the art.
  • Reinforcing member 130 may be bonded to media 122 using a variety of techniques, such as adhesive bonding, thermal bonding, solvent bonding, or ultrasonic bonding.
  • location 134 is upstream from rotary-score pleater 138 which scores media 122 and reinforcing member 130 prior to pleating at pleat folding station 140 .
  • Infrared heaters 142 may optionally be provided for heat-setting the pleats 144 .
  • the pleats 144 are retained in an accumulator 146 and then advanced to a pleat spacing device 148 that retains the pleats 144 in the desired pleat spacing.
  • Pleat formation and pleat spacing may be performed by a variety of methods, such as disclosed in U.S. Pat. No. 4,798,575 (Siversson '575), U.S. Pat. No. 4,976,677 (Siversson '677) and U.S. Pat. No. 5,389,175 (Wenz).
  • the resulting pleated filter media 100 is expanded to the desired pleat spacing in the pleat spacing device 148 .
  • One or more elongated, planar reinforcing strips 162 may optionally be applied to the pleat tips along the filter front face 164 at station 168 to maintain the pleat spacing.
  • the reinforcing strips 162 may be bonded to the pleat tips by various techniques, such as adhesive bonding, thermal bonding, solvent bonding, or ultrasonic bonding, and can provide additional dimensional stability to the pleats 144 .
  • the pleated filter media 100 and optional reinforcing strip 162 can be cut to a desired size and shape.
  • Pleated filter media 100 may be used in filtration applications, with or without a frame structure, or as an insert into a permanent or a reusable frame.
  • a scrim 162 extending substantially across the entire front face 164 may be employed. Scrim 162 may be bonded to the pleat tips to provide additional dimensional stability to pleated filter media 100 .
  • one or more elongated, planar reinforcing strips 166 may optionally be bonded to the rear face 132 of pleated filter media 100 at station 168 .
  • the reinforcing strips 166 may be located over the reinforcing member 130 and opposite the reinforcing strips 162 to form truss structures as shown in FIG. 6 of Sundet et al. '011.
  • the pleated filter 172 exits the system 120 after the cutting station 186 .
  • a continuous strip of frame material 180 may be applied to the side edges of pleated filter media 100 parallel to the machine direction 136 .
  • An adhesive such as a hot melt adhesive, may be applied to a first flange of a U-shaped channel formed from frame material 180 at station 187 .
  • An adhesive for sealing the ends of the pleats 144 may be applied at station 188 .
  • An adhesive may be applied to a second flange of the U-shaped channel at station 190 .
  • the frame material 180 may be bent into a U-shaped configuration at station 194 .
  • the ends of U-shaped channel may extend partially onto the front face 164 and rear face 132 of the pleated filter media 100 .
  • An assembly including the endless web of pleated filter media 100 and attached frame material 180 may be cut at station 186 to desired lengths.
  • the pleated filter media 100 and reinforcing strips 162 may also be cut to size before application of frame material 180 .
  • the pleated filter media 100 and side frames members 192 may be rotated 90° at location 191 to permit application of end frame members 196 at station 198 and formation of framed pleated filter 174 .
  • Framed pleated filter 174 may also be formed by configuring members 192 , 196 as two box structures that are positioned over the first and second faces 132 , 164 , respectively, of pleated filter media 100 , with overlapped circumferential portions, such as disclosed in U.S. Pat. No. 5,782,944 (Justice).
  • the frame member members 192 , 196 can be configured as a one-sided die-cut frame that is folded around framed pleated filter 174 .
  • the pleated filters 172 , 174 are typically enclosed in suitable packaging.
  • the pleat spacing is typically about 3 to about 6 pleats per 25.4 centimeters (1 inch).
  • the pleat depth and filter thickness is typically about 25 centimeters to about 102 centimeters (1 inch to 4 inches).
  • the filter length and width is typically about 30.5 centimeters ⁇ 30.5 centimeters (12 inches ⁇ 12 inches) to about 50.8 centimeters ⁇ 122 centimeters (20 inches ⁇ 48 inches).
  • the disclosed pleated filters may be employed in a variety of applications including ventilation (e.g., furnace and clean room filters), pollution control (e.g., baghouse filters), liquid treatment (e.g., water filters), personal protection (e.g., protective suits with powered air supplies) and other applications that will be familiar to those skilled in the art.
  • ventilation e.g., furnace and clean room filters
  • pollution control e.g., baghouse filters
  • liquid treatment e.g., water filters
  • personal protection e.g., protective suits with powered air supplies
  • the overall visual web appearance was evaluated using a Zeiss Instruments dissecting microscope equipped with a charge coupled device camera having an 8 mm ⁇ 14 mm magnification window.
  • Web stiffness was evaluated using a Model 150-B TABERTM stiffness tester (commercially available from Taber Industries). Square 3.8 cm ⁇ 3.8 cm sections were carefully vivisected from the webs using a sharp razor blade to prevent fiber fusion, and evaluated to determine their stiffness in the machine and transverse directions using 3 to 4 samples and a 15° sample deflection.
  • Q F Filtration quality factors
  • Q F values can be reported as a curve plotting Q F vs. the DOP challenge total mass after various time periods.
  • the initial Q F value usually provides a reliable indicator of overall performance, with higher initial Q F values indicating better filtration performance and lower initial Q F values indicating reduced filtration performance.
  • Initial filtration quality factors Q F of at least about 0.6 (using 100 ppm dioctyl phthalate particles having a size range between 10 and 700 nm traveling at a 7 cm/sec face velocity), more preferably at least about 0.8 and most preferably at least about 1 are preferred.
  • ASHRAE standard 52.2 “Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size”.
  • the ASHRAE standard evaluates filtration of a test aerosol containing laboratory-generated potassium chloride particles dispersed into an airstream.
  • a particle counter measures and counts the particles in 12 size ranges upstream and downstream from the filter.
  • the results can be reported as minimum composite efficiency values for particles in various size ranges.
  • the minimum composite efficiency values correspond to the minimum percent particle retention (the downstream particle count/upstream particle count ⁇ 100 for the size range in question) as the filter is loaded to a final pressure drop of 25.4 mm H 2 O.
  • a set of particle size removal efficiency performance curves at incremental dust loading levels may also be developed, and together with an initial clean performance curve may be used to form a composite curve representing the minimum performance in each size range. Points on the composite curve are averaged and the averages used to determine the minimum efficiency reporting value for the filter.
  • a conventional 20.5 cm wide meltblowing apparatus was modified by addition of a secondary air quench system and a flat-bed collector arranged as in FIG. 1 .
  • secondary quench air would not be employed and the web would be collected on a rounded surface such as a porous drum.
  • the modified apparatus was used to make meltblown polypropylene webs whose fibers were highly aligned in the machine direction.
  • the secondary air quench system employed two opposed horizontally-disposed 76 cm wide ⁇ 51 cm high air outlets disposed approximately 6 cm below the meltblowing die tip, dispensing 12-13° C. chilled air flowing at various rates (or not at all) through the air outlets.
  • the flat-bed collector employed a vacuum collection system located under the bed.
  • the meltblowing die was positioned over the leading edge of the collector.
  • FINATM type 3960 polypropylene commercially available from Fina Oil and Chemical Co.
  • the die was maintained at about 265° C. using resistance heaters and supplied with 300° C. primary air flowing at 4.2 m 3 /min.
  • the DCD was adjusted to provide webs having a 0.5 mm H 2 O pressure drop at a 32.5 L/min flow rate.
  • the DCD was approximately 20 cm.
  • the DCD was approximately 34 cm.
  • the collector vacuum was adjusted to provide webs having 8-9% solidity.
  • the collector vacuum was 3250 N/m 2 for webs prepared using secondary quench air at 50 or 35 m/sec outlet velocity, 5000 N/m 2 for webs prepared using secondary quench air at 17 m/sec outlet velocity, and zero for webs prepared without secondary quench air.
  • the collected webs had an 80 g/m 2 basis weight and a 19 ⁇ m EFD.
  • the webs were corona-treated as described in U.S. Pat. No. 4,588,537 to Klasse et al., hydrocharged as described in U.S. Pat. No. 5,908,598 to Rousseau et al. and evaluated to determine their mechanical properties and filtration quality factor Q F .
  • the webs were also heat treated at 126° C. for 5 minutes and reevaluated to determine their mechanical properties.
  • Table 1 Set out below in Table 1 are the Example No. or Comparison Example No., secondary air velocity and mass flow ratio, the fiber count and fiber alignment data, and the filtration quality factor Q F for each web.
  • Table 2 are the machine direction (“MD”) and transverse direction (“TD”) Taber Stiffness and tensile strength values for the each web, and the ratio of MD to TD Taber Stiffness and tensile strength.
  • Table 3 are the MD and TD Taber Stiffness and tensile strength values for the heat treated webs, and the ratio of MD to TD Taber Stiffness and tensile strength.
  • FIGS. 3-6 are polar “radar” plots respectively showing the number and orientation (in degrees with respect to the 0° machine direction) of fibers in Examples 1-3 and Comparison Example 1. Because fibers oriented at 0° with respect to the machine direction could also be said to be oriented at 180°, the plots have symmetric lobes reflected about the origin.
  • FIG. 3 shows for example that 12 fibers were oriented at 0° with respect to the machine direction, 9 fibers were oriented at ⁇ 10°, 8 fibers were oriented at +10°, 6 fibers were oriented at ⁇ 20°, and so on.
  • FIGS. 3-6 are polar “radar” plots respectively showing the number and orientation (in degrees with respect to the 0° machine direction) of fibers in Examples 1-3 and Comparison Example 1. Because fibers oriented at 0° with respect to the machine direction could also be said to be oriented at 180°, the plots have symmetric lobes reflected about the origin.
  • FIG. 3 shows for example that 12 fibers were
  • FIG. 3-5 show that the disclosed webs had considerably greater machine direction alignment than the web prepared without secondary quench air plotted in FIG. 6 .
  • FIG. 4 web shown in the Lau et al. '749 patent was evaluated to determine its fiber orientation and fiber count, and found to have only 50% of its fibers aligned within ⁇ 20° of the machine direction.
  • the FIG. 3-5 plots generally mirror the behavior of a wetting fluid placed on the non-collector side of the web. If a drop of a suitable wetting fluid (preferably colored to aid in observation) is so placed it will tend to spread into the web in an oblong pattern generally corresponding to the radar plot lobe shapes, thus providing a convenient indicator of the primary direction of fiber orientation and web formation. When a wetting fluid is placed on the Comparison Example 1 web, it tends to spread more or less evenly outward in an expanding circular pattern.
  • a suitable wetting fluid preferably colored to aid in observation
  • Table 1 also shows that as the secondary quench air volume increased, the filtration quality factor Q F increased and then decreased slightly.
  • Webs prepared using secondary air had visible striations generally aligned in the machine direction, a surface with an overall smooth sheen and slight fuzziness, and few or none of the nodules that usually are found in conventional blown microfiber webs. Fibers having approximately 2 to 5 cm lengths could be teased from the webs using tweezers. Webs prepared without secondary quench air visually resembled standard blown microfiber webs collected on a round collector. Some relatively short (less than 1 cm) individual fibers could be removed from these webs using tweezers, but only with great difficulty.
  • heat treating could be used to increase web stiffness and tensile strength. For several of the webs this could be done without causing a substantial change in the web's overall mechanical anisotropy as measured using MD:TD property ratios.
  • meltblown polypropylene webs were prepared using 300° C. primary air flowing at 3.4 m 3 /min and secondary quench air and collector vacuum adjusted to provide collected webs having an 80 g/m 2 basis weight, 8-9% solidity and smaller effective fiber diameters than were obtained in Example 1.
  • Example No. secondary air velocity and mass flow ratio, effective fiber diameter and the fiber count and fiber alignment data for the resulting webs.
  • PET polyethylene terephthalate
  • nylon ULTRAMIDTM BS-400N nylon, commercially available from BASF Corp.
  • a 12.7 cm DCD was used to prepare the PET webs and a 16.5 cm DCD was used to prepare the nylon webs.
  • the collected PET webs had an 85 g/m 2 basis weight, 5-6% solidity and a 16 ⁇ m EFD.
  • the collected nylon webs had a 70 g/m 2 basis weight, 5-6% solidity and a 17-18 ⁇ m EFD.
  • Example 2 was repeated using a 1.5% addition of the additive poly(4-methyl-1-pentene). This increased the filtration quality factor Q F from 1.5 without the additive to 1.7 with the additive.
  • Example 11 was repeated using a 1.5% addition of the additive poly(4-methyl-1-pentene) and a 0.5% addition of CHIMASSORB 944 hindered amine light stabilizer.
  • the web was hydrocharged but not corona-treated.
  • the filtration quality factor Q F was 2.5, and more than double that obtained using webs made from conventional untreated polypropylene blown microfibers made without secondary quench air.
  • meltblown polypropylene webs were prepared with and without secondary quench air flowing at a 1770 secondary quench air:polymer mass flow ratio, corona-treated, hydrocharged, and evaluated to determine their filtration quality factor Q F .
  • the webs had an 85 g/m 2 basis weight, 19-21 ⁇ m EFD, and a pressure drop of 0.4-0.5 mm H 2 O at 42.5 L/min.
  • Set out below in Table 6 are the Q F factors after various cumulative DOP exposure levels for the web made with (Example 13) or without (Comparison Example 4) secondary quench air. TABLE 6 Cumulative DOP Comparison Challenge, Example 13 Example 4 (mg) Web, Q F Web, Q F Initial 1.8 0.7 50 1 0.2 100 0.6 0.15 150 0.45 0.1 200 0.3 ⁇ 0.1
  • the corona-treated and hydrocharged Example 2 webs, the corona-treated and hydrocharged Comparison Example 1 webs and a sample of ACCUAIR# corona-treated spunbond polyethylene/polypropylene twinned fiber web (71 g/m 2 basis weight, ⁇ 20 ⁇ m EFD, commercially available from Kimberly Clark Corp.) were formed into 50.8 cm ⁇ 63.5 cm ⁇ 2.1 cm high filter elements having pleats 102 like pleated media 100 shown in FIG. 7 .
  • the pleats 102 were arranged so that the folds were aligned with the transverse direction, with 87 pleats (13.8 pleats/10 cm) along the long dimension.
  • the pleated media 100 was sandwiched between and glued to expanded metal supports like support 110 and mounted in a cardboard frame like frame 112 shown in FIG. 8 to form a framed filter like filter 114 .
  • the finished filters were evaluated for filtration performance according to ASHRAE standard 52.2, “Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size” at a 1.5 m/sec face velocity.
  • the results reported below in Table 7 show the minimum composite efficiency values for particles in the size ranges 0.3 to 1 ⁇ m, 1 to 3 ⁇ m and 3 to 10 ⁇ m.
  • Table 7 also reports the total filter weight gain (total particulate weight captured by the filter) after completion of the evaluation.
  • Example 14 and 15 corona-treated or corona-treated and hydrocharged meltblown nonwoven webs made using secondary quench air and having substantial machine direction fiber alignment
  • Example 14 and Example 15 provided much better minimum composite efficiency at a 1 mm H 2 O pressure drop than otherwise similar meltblown nonwoven webs made without secondary quench air and having less fiber alignment
  • the Example 14 and Example 15 webs also had comparable or better minimum composite efficiency than a commercial spunbond nonwoven web (Comparison Example 7).
  • the Example 14 and Example 15 webs had better particle capture (as evidenced by their higher total filter weight gain values) than the Comparison Example 5-7 webs.
  • meltblown aligned fiber polypropylene web was corona-treated and hydrocharged but not heat treated. This web had a 1.7 MD Taber Stiffness value and is identified below as the web of Example 16.
  • a stiffer web was prepared using corona-treatment, hydrocharging and heat treatment. This web had a 2.2 MD Taber Stiffness value and is identified below as the web of Example 17.
  • a yet stiffer web was prepared using a 1.5% addition of the additive poly(4-methyl-1-pentene), corona-treatment, hydrocharging and heat treatment. This web had a 3.7 MD Taber Stiffness value and is identified below as the web of Example 18.
  • Example 16-18 webs and a sample of ACCUAIR corona-treated spunbond polyethylene/polypropylene twinned fiber web (having a 2.1 MD Taber Stiffness and identified below as the web of Comparison Example 8) were formed into 30 cm ⁇ 27 cm ⁇ 2.1 cm high filter elements having pleats 102 like filter media 100 shown in FIG. 7 .
  • the filters had 13.8 pleats/10 cm along the long dimension, and were sandwiched between and glued to expanded metal supports like support 110 in FIG. 8 .
  • each such filter was mounted in a PLEXIGLASTM plastic frame whose transparent side plates permitted the pleat edges to be photographed. The frame side plates touched the filtration media edges but permitted pleat movement.
  • the frame was mounted atop a vacuum table and exposed to air from a downwardly-directed box fan.
  • the filters were loaded by sprinkling a synthetic dust made from a 50:50 mixture of SAE Fine Test Dust and talc into the air stream until the filter pressure drop reached about 0.35 in (0.9 cm) of water at an approximate 1.5 m/sec face velocity. This simulated a substantial natural loading level.
  • Table 8 Set out below in Table 8 are the filter descriptions, MD Taber Stiffness values and total filter weight gain values. TABLE 8 Example No. or MD Taber Total Filter Weight Gain Comp. Ex. No. Stiffness (g) 16 1.7 37.9 17 2.2 40.2 18 3.7 33.4 Comp. Ex. 8 2.1 36.2
  • the filters were next mounted in a duct equipped with an anemometer and exposed to flowing air at velocities sufficient to cause pressure drops between about 0.2 in. (0.5 cm) of water and 1.2 in. (3 cm) of water.
  • the Example 16 (1.7 MD Taber Stiffness) filter began to exhibit noticeable pleat deformation, manifested by pinching together of the pleats at the filter air inlet side, at a 0.35 in (0.9 cm) pressure drop.
  • the Example 17 (2.2 MD Taber Stiffness) and Comparison Example 8 filters began to exhibit noticeable pleat deformation at a 0.5 in (1.3 cm) pressure drop.
  • the Example 18 (3.7 MD Taber Stiffness) filter did not exhibit noticeable pleat deformation even at a 1.2 in (3 cm) pressure drop.
  • Example 18 shows a plot of the pressure drop (in inches of water) vs. anemometer reading (in nominal units) for the filters of Example 16 (curve 116 ), Example 17 (curve 117 ), Example 18 (curve 118 ) and Comparison Example 8 (curve 119 ).
  • the Example 18 filter exhibited a linear increase in pressure drop as airflow increased, whereas the other tested filters exhibited a non-linear response, indicative of pleat distortion, as airflow increased.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
  • Executing Machine-Instructions (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
US10/818,091 2004-04-05 2004-04-05 Pleated aligned web filter Abandoned US20050217226A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US10/818,091 US20050217226A1 (en) 2004-04-05 2004-04-05 Pleated aligned web filter
BRPI0509031-8A BRPI0509031A (pt) 2004-04-05 2005-03-08 elemento de filtro, e,método de produzir um elemento de filtro pregueado
AT05724959T ATE437689T1 (de) 2004-04-05 2005-03-08 Gefalteter filter mit ausgerichtetem vlies
JP2007506196A JP2007531617A (ja) 2004-04-05 2005-03-08 プリーツ付きの位置合せされたウェブフィルタ
KR1020067020942A KR20070004823A (ko) 2004-04-05 2005-03-08 병풍모양 정렬된 웹 필터
DE200560015690 DE602005015690D1 (de) 2004-04-05 2005-03-08 Gefalteter filter mit ausgerichtetem vlies
CNB2005800107050A CN100553734C (zh) 2004-04-05 2005-03-08 折叠排列网过滤器
RU2006133410/12A RU2006133410A (ru) 2004-04-05 2005-03-08 Гофрированный ориентированный фильтр из нетканого холста
PCT/US2005/007538 WO2005102497A1 (en) 2004-04-05 2005-03-08 Pleated aligned web filter
EP05724959A EP1732664B1 (en) 2004-04-05 2005-03-08 Pleated aligned web filter
US11/457,933 US7622063B2 (en) 2004-04-05 2006-07-17 Pleated aligned web filter
US12/553,424 US8142538B2 (en) 2004-04-05 2009-09-03 Pleated aligned web filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/818,091 US20050217226A1 (en) 2004-04-05 2004-04-05 Pleated aligned web filter

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/457,933 Continuation-In-Part US7622063B2 (en) 2004-04-05 2006-07-17 Pleated aligned web filter

Publications (1)

Publication Number Publication Date
US20050217226A1 true US20050217226A1 (en) 2005-10-06

Family

ID=34961955

Family Applications (3)

Application Number Title Priority Date Filing Date
US10/818,091 Abandoned US20050217226A1 (en) 2004-04-05 2004-04-05 Pleated aligned web filter
US11/457,933 Expired - Fee Related US7622063B2 (en) 2004-04-05 2006-07-17 Pleated aligned web filter
US12/553,424 Expired - Fee Related US8142538B2 (en) 2004-04-05 2009-09-03 Pleated aligned web filter

Family Applications After (2)

Application Number Title Priority Date Filing Date
US11/457,933 Expired - Fee Related US7622063B2 (en) 2004-04-05 2006-07-17 Pleated aligned web filter
US12/553,424 Expired - Fee Related US8142538B2 (en) 2004-04-05 2009-09-03 Pleated aligned web filter

Country Status (10)

Country Link
US (3) US20050217226A1 (ko)
EP (1) EP1732664B1 (ko)
JP (1) JP2007531617A (ko)
KR (1) KR20070004823A (ko)
CN (1) CN100553734C (ko)
AT (1) ATE437689T1 (ko)
BR (1) BRPI0509031A (ko)
DE (1) DE602005015690D1 (ko)
RU (1) RU2006133410A (ko)
WO (1) WO2005102497A1 (ko)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080011303A1 (en) * 2006-07-17 2008-01-17 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
US20080022642A1 (en) * 2006-07-31 2008-01-31 Fox Andrew R Pleated filter with monolayer monocomponent meltspun media
US20080026659A1 (en) * 2006-07-31 2008-01-31 3M Innovative Properties Company Monocomponent Monolayer Meltblown Web And Meltblowing Apparatus
US20080022643A1 (en) * 2006-07-31 2008-01-31 Fox Andrew R Pleated filter with bimodal monolayer monocomponent media
US20080057263A1 (en) * 2006-09-06 2008-03-06 Shinih Enterprise Co., Ltd. Fibrous pad structure having a variable density
WO2008085545A2 (en) 2006-07-31 2008-07-17 3M Innovative Properties Company Method for making shaped filtration articles
US7517378B2 (en) 2007-01-09 2009-04-14 Knapp Steven E Integral rigid edging for synthetic air filters
US20090120048A1 (en) * 2007-11-09 2009-05-14 Hollingsworth & Vose Company Meltblown Filter Medium
US20090241490A1 (en) * 2008-03-30 2009-10-01 Lack Nicholas L Filter with multiple sections of different media
US20090315224A1 (en) * 2006-07-31 2009-12-24 Angadjivand Seyed A Method for making shaped filtration articles
US20100043639A1 (en) * 2005-10-19 2010-02-25 3M Innovative Properties Company Highly charged, charge stable nanofiber web
US20100078379A1 (en) * 2008-07-25 2010-04-01 Donaldson Company, Inc. Pleated filtration media, media packs, filter elements, and methods for filtering fluids
US20110186504A1 (en) * 2010-01-25 2011-08-04 Donaldson Company, Inc. Pleated filtration media having tapered flutes
US20120246907A1 (en) * 2009-03-24 2012-10-04 Lee Pendleton Morgan Canister air filter and method for fabricating the same
US8850719B2 (en) 2009-02-06 2014-10-07 Nike, Inc. Layered thermoplastic non-woven textile elements
US8906275B2 (en) 2012-05-29 2014-12-09 Nike, Inc. Textured elements incorporating non-woven textile materials and methods for manufacturing the textured elements
US8950587B2 (en) 2009-04-03 2015-02-10 Hollingsworth & Vose Company Filter media suitable for hydraulic applications
US8986432B2 (en) 2007-11-09 2015-03-24 Hollingsworth & Vose Company Meltblown filter medium, related applications and uses
US9227363B2 (en) 2009-02-06 2016-01-05 Nike, Inc. Thermoplastic non-woven textile elements
US9283501B2 (en) 2010-04-27 2016-03-15 Hollingsworth & Vose Company Filter media with a multi-layer structure
WO2016119080A1 (en) * 2015-01-29 2016-08-04 3M Innovative Properties Company Conformable pleated air filter with bridging filaments
US9433884B2 (en) 2007-06-26 2016-09-06 Donaldson Company, Inc. Filtration media pack, filter element, and methods
US9517430B2 (en) 2007-02-02 2016-12-13 Donaldson Company, Inc. Air filtration media pack, filter element, air filtration media, and methods
US9579848B2 (en) 2009-02-06 2017-02-28 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
US9694306B2 (en) 2013-05-24 2017-07-04 Hollingsworth & Vose Company Filter media including polymer compositions and blends
US9808752B2 (en) 2008-02-04 2017-11-07 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media
US9982367B2 (en) * 2015-04-27 2018-05-29 Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik Method and apparatus for making a nonwoven fabric from thermoplastic filaments
US10155186B2 (en) 2010-12-17 2018-12-18 Hollingsworth & Vose Company Fine fiber filter media and processes
US10328371B2 (en) 2014-03-21 2019-06-25 3M Innovative Properties Company Refillable air filter assembly
US10363513B2 (en) 2009-08-03 2019-07-30 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media having tapered flutes
US20190247777A1 (en) * 2018-02-09 2019-08-15 American Air Filter Company, Inc. Method and Apparatus for Providing Test Ports
US10653986B2 (en) 2010-12-17 2020-05-19 Hollingsworth & Vose Company Fine fiber filter media and processes
CN111818985A (zh) * 2018-02-09 2020-10-23 美国空气过滤器股份有限公司 用于提供测试端口的方法和设备
US11369910B2 (en) * 2017-04-11 2022-06-28 Cummins Filtration Ip, Inc. Panel filter element
CN114733282A (zh) * 2022-04-24 2022-07-12 廊坊坤合过滤器材有限公司 一种折叠式天然气滤芯
US11779071B2 (en) 2012-04-03 2023-10-10 Nike, Inc. Apparel and other products incorporating a thermoplastic polymer material
US12017177B2 (en) 2022-04-11 2024-06-25 Donaldson Company, Inc. Filtration media pack, filter element, and methods

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060254427A1 (en) * 2004-11-08 2006-11-16 3M Innovative Properties Company Particle-containing fibrous web
JP4843030B2 (ja) * 2005-05-23 2011-12-21 スリーエム イノベイティブ プロパティズ カンパニー 補助マニホールドからの流体流れを利用して高分子材料をメルトブローイングするための方法及び装置
US8545658B2 (en) * 2005-11-09 2013-10-01 3M Innovative Properties Company Apparatus and methods for forming filter sleeves having circumferential pleats for use in a bag-type filter assembly
JP5002541B2 (ja) * 2008-06-13 2012-08-15 株式会社マーレ フィルターシステムズ フィルタエレメント
CA2665530C (en) * 2009-04-28 2017-04-11 Clarcor Air Filtration Products, Inc. Panel filter
CA2665541C (en) * 2009-04-28 2017-04-11 Clarcor Air Filtration Products, Inc. Panel filter
CN102309901A (zh) * 2011-09-28 2012-01-11 中国北车集团大连机车研究所有限公司 低风阻空气过滤装置
US9808753B2 (en) 2013-02-15 2017-11-07 3M Innovative Properties Company System and method for making pleated filter media
CN105518197A (zh) * 2013-09-03 2016-04-20 3M创新有限公司 熔纺工艺、熔纺非织造纤维网和相关过滤介质
JP6728140B2 (ja) 2014-08-25 2020-07-22 スリーエム イノベイティブ プロパティズ カンパニー 均一に拡張可能なエアフィルタ
US10406472B2 (en) * 2015-03-12 2019-09-10 3M Innovative Properties Company Collapsible air filter
CA2999484C (en) 2015-09-24 2023-09-19 3M Innovative Properties Company Expandable air filters
WO2017053177A1 (en) 2015-09-24 2017-03-30 3M Innovative Properties Company Air filter devices with gap sealing unit
DE102015014017B4 (de) 2015-10-30 2021-02-18 Dräger Safety AG & Co. KGaA Partikelfilter sowie Verfahren zu dessen Herstellung
WO2017213926A1 (en) 2016-06-06 2017-12-14 3M Innovative Properties Company Channel-framed, pleated air filter with bridging filaments
US20180117202A1 (en) * 2016-11-03 2018-05-03 Weiming Gao Reactivatable air purification pad with molecular sieves and process
EP3335779A1 (en) 2016-12-15 2018-06-20 Mann+Hummel GmbH Filter medium and method of making it
CA3060405C (en) 2017-04-18 2020-06-16 3M Innovative Properties Company Air filter media with post-pleat-deposited sorbent particles
US20210187421A1 (en) * 2019-12-19 2021-06-24 Hollingsworth & Vose Company Filter media comprising a non-wetlaid backer
CN112680882B (zh) * 2020-12-11 2022-07-05 厦门保瑞达环保科技有限公司 一种高精度直立型过滤毡制作方法

Citations (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780872A (en) * 1968-05-27 1973-12-25 Pall Corp Filters comprising anisometric compressed and bonded multilayer knitted wire mesh composites
US3877909A (en) * 1974-04-23 1975-04-15 Drico Ind Corp Internally self-supporting filter and process for making same
US3920428A (en) * 1974-03-25 1975-11-18 Ethyl Corp Filter element
US3959421A (en) * 1974-04-17 1976-05-25 Kimberly-Clark Corporation Method for rapid quenching of melt blown fibers
US3971373A (en) * 1974-01-21 1976-07-27 Minnesota Mining And Manufacturing Company Particle-loaded microfiber sheet product and respirators made therefrom
US4181513A (en) * 1974-11-05 1980-01-01 Toyobo Co., Ltd. Carbon adsorptive filter material with layers of reinforcing non woven fabrics needle punched
US4360433A (en) * 1978-01-23 1982-11-23 Process Scientific Innovations Limited Filter elements for gas or liquid
US4390031A (en) * 1979-11-21 1983-06-28 American Filtrona Corporation Tobacco filter
US4429001A (en) * 1982-03-04 1984-01-31 Minnesota Mining And Manufacturing Company Sheet product containing sorbent particulate material
US4547950A (en) * 1984-05-29 1985-10-22 Honeywell Inc. Method of spacing the folds of a folded filter media
US4588537A (en) * 1983-02-04 1986-05-13 Minnesota Mining And Manufacturing Company Method for manufacturing an electret filter medium
US4593706A (en) * 1980-08-04 1986-06-10 Molins Limited Producing filler material, particularly for cigarette filters
US4622259A (en) * 1985-08-08 1986-11-11 Surgikos, Inc. Nonwoven medical fabric
US4798575A (en) * 1985-06-20 1989-01-17 Flodins Filter Ab Method and apparatus for the manufacture of filters
US4798850A (en) * 1986-05-19 1989-01-17 National Research Development Corporation Blended-fibre filter material
US4915835A (en) * 1983-03-21 1990-04-10 Filtration Water Filters For Agri. And Indt. Ltd. Flushable fiber-filter element for filtering a fluid
US4976677A (en) * 1986-11-17 1990-12-11 Flodins Filter Ab Process for the production of filters, and a filter produced by the process
US5075068A (en) * 1990-10-11 1991-12-24 Exxon Chemical Patents Inc. Method and apparatus for treating meltblown filaments
US5141699A (en) * 1987-12-21 1992-08-25 Minnesota Mining And Manufacturing Company Process for making oriented melt-blown microfibers
US5240479A (en) * 1991-05-17 1993-08-31 Donaldson Company, Inc. Pleated filter media having a continuous bead of adhesive between layers of filtering material
US5389175A (en) * 1992-07-18 1995-02-14 Filterwerk Mann & Hummel Gmbh Method of manufacturing a pleated filter material
US5405559A (en) * 1993-12-08 1995-04-11 The Board Of Regents Of The University Of Oklahoma Polymer processing using pulsating fluidic flow
US5470470A (en) * 1992-02-10 1995-11-28 Leyat Fils Marketing Sa Liquid filter fiber module disposed in an inflatable belt
US5496507A (en) * 1993-08-17 1996-03-05 Minnesota Mining And Manufacturing Company Method of charging electret filter media
US5605748A (en) * 1993-01-22 1997-02-25 Monsanto Enviro-Chem Systems, Inc. Fiber beds for fiber bed mist eliminators
US5652048A (en) * 1995-08-02 1997-07-29 Kimberly-Clark Worldwide, Inc. High bulk nonwoven sorbent
US5657750A (en) * 1994-10-04 1997-08-19 Irad Technologies Ltd. Fluid filtering device utilizable with gas monitors
US5665278A (en) * 1996-01-17 1997-09-09 J & M Laboratories, Inc. Airless quench method and apparatus for meltblowing
US5667749A (en) * 1995-08-02 1997-09-16 Kimberly-Clark Worldwide, Inc. Method for the production of fibers and materials having enhanced characteristics
US5695487A (en) * 1994-09-09 1997-12-09 Kimberly-Clark Worldwide, Inc. Z-directon liquid transport medium
US5709735A (en) * 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US5772948A (en) * 1996-11-19 1998-06-30 Plastaflex Corporation Melt-blown fiber system with pivotal oscillating member and corresponding method
US5782944A (en) * 1997-03-18 1998-07-21 Purolator Products Air Filtration Company Moisture resistant air filter
US5785725A (en) * 1997-04-14 1998-07-28 Johns Manville International, Inc. Polymeric fiber and glass fiber composite filter media
US5811178A (en) * 1995-08-02 1998-09-22 Kimberly-Clark Worldwide, Inc. High bulk nonwoven sorbent with fiber density gradient
US5820645A (en) * 1997-05-23 1998-10-13 Reemay, Inc. Pleatable nonwoven composite article for gas filter media
US5908598A (en) * 1995-08-14 1999-06-01 Minnesota Mining And Manufacturing Company Fibrous webs having enhanced electret properties
US6102039A (en) * 1997-12-01 2000-08-15 3M Innovative Properties Company Molded respirator containing sorbent particles
US6136409A (en) * 1995-02-20 2000-10-24 Toray Industries, Inc. Nonwoven fabric, filter medium and process for producing the same
US6165244A (en) * 1999-03-13 2000-12-26 Aaf International, Inc. Filter media with fluid stream positioned fibers
USD449100S1 (en) * 2000-08-25 2001-10-09 3M Innovative Properties Company HVAC filter
US6398847B1 (en) * 1998-07-02 2002-06-04 3M Innovative Properties Company Method of removing contaminants from an aerosol using a new electret article
US6521011B1 (en) * 1999-07-15 2003-02-18 3M Innovative Properties Company Self-supporting pleated filter and method of making same

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1453447A (en) * 1972-09-06 1976-10-20 Kimberly Clark Co Nonwoven thermoplastic fabric
JPS60168511A (ja) * 1984-02-10 1985-09-02 Japan Vilene Co Ltd エレクトレツトフイルタの製造方法
US5993943A (en) * 1987-12-21 1999-11-30 3M Innovative Properties Company Oriented melt-blown fibers, processes for making such fibers and webs made from such fibers
JP3013428B2 (ja) * 1990-10-23 2000-02-28 東洋紡績株式会社 キャビンフィルター
US5244723A (en) * 1992-01-03 1993-09-14 Kimberly-Clark Corporation Filaments, tow, and webs formed by hydraulic spinning
US5443606A (en) * 1992-03-26 1995-08-22 The University Of Tennessee Reserch Corporation Post-treatment of laminated nonwoven cellulosic fiber webs
US5273565A (en) * 1992-10-14 1993-12-28 Exxon Chemical Patents Inc. Meltblown fabric
JPH08318115A (ja) * 1995-05-26 1996-12-03 Toyobo Co Ltd フィルター、フィルターカートリッジおよびフィルター用不織布の製造方法
JP3512266B2 (ja) * 1995-05-31 2004-03-29 帝人テクノプロダクツ株式会社 メルトブロー成型装置及び弾性不織布の製造方法
GB9715857D0 (en) * 1997-07-29 1997-10-01 Philips Electronics Nv Wireless networked message routing
US6615244B1 (en) 1998-11-28 2003-09-02 Tara C Singhal Internet based archive system for personal computers
US6126707A (en) * 1999-03-05 2000-10-03 3M Innovative Properties Company Disposable air filter with improved frame
JP2001149720A (ja) * 1999-11-29 2001-06-05 Chisso Corp フィルター
JP2002102258A (ja) 2000-09-29 2002-04-09 Aichi Steel Works Ltd バータイプインプラント用義歯アタッチメント
JP2003286648A (ja) 2002-03-26 2003-10-10 Nippon Petrochemicals Co Ltd フィラメントが一方向に配列されたウェブの製造方法および該ウェブの製造装置
JP4016327B2 (ja) * 2002-08-20 2007-12-05 東洋紡績株式会社 ポリエステル系不織布およびフィルター
JP3960192B2 (ja) * 2002-10-17 2007-08-15 三菱マテリアル株式会社 放熱体
US20040140260A1 (en) * 2003-01-10 2004-07-22 Morimura Kousan Kabushiki Kaisha Filter medium and method for preparing same
JP4161209B2 (ja) 2003-11-20 2008-10-08 三菱自動車工業株式会社 内燃機関の可変動弁装置

Patent Citations (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780872A (en) * 1968-05-27 1973-12-25 Pall Corp Filters comprising anisometric compressed and bonded multilayer knitted wire mesh composites
US3971373A (en) * 1974-01-21 1976-07-27 Minnesota Mining And Manufacturing Company Particle-loaded microfiber sheet product and respirators made therefrom
US3920428A (en) * 1974-03-25 1975-11-18 Ethyl Corp Filter element
US3959421A (en) * 1974-04-17 1976-05-25 Kimberly-Clark Corporation Method for rapid quenching of melt blown fibers
US3877909A (en) * 1974-04-23 1975-04-15 Drico Ind Corp Internally self-supporting filter and process for making same
US4181513A (en) * 1974-11-05 1980-01-01 Toyobo Co., Ltd. Carbon adsorptive filter material with layers of reinforcing non woven fabrics needle punched
US4360433A (en) * 1978-01-23 1982-11-23 Process Scientific Innovations Limited Filter elements for gas or liquid
US4390031A (en) * 1979-11-21 1983-06-28 American Filtrona Corporation Tobacco filter
US4593706A (en) * 1980-08-04 1986-06-10 Molins Limited Producing filler material, particularly for cigarette filters
US4429001A (en) * 1982-03-04 1984-01-31 Minnesota Mining And Manufacturing Company Sheet product containing sorbent particulate material
US4588537A (en) * 1983-02-04 1986-05-13 Minnesota Mining And Manufacturing Company Method for manufacturing an electret filter medium
US4915835A (en) * 1983-03-21 1990-04-10 Filtration Water Filters For Agri. And Indt. Ltd. Flushable fiber-filter element for filtering a fluid
US4547950A (en) * 1984-05-29 1985-10-22 Honeywell Inc. Method of spacing the folds of a folded filter media
US4798575A (en) * 1985-06-20 1989-01-17 Flodins Filter Ab Method and apparatus for the manufacture of filters
US4622259A (en) * 1985-08-08 1986-11-11 Surgikos, Inc. Nonwoven medical fabric
US4798850A (en) * 1986-05-19 1989-01-17 National Research Development Corporation Blended-fibre filter material
US4976677A (en) * 1986-11-17 1990-12-11 Flodins Filter Ab Process for the production of filters, and a filter produced by the process
US5141699A (en) * 1987-12-21 1992-08-25 Minnesota Mining And Manufacturing Company Process for making oriented melt-blown microfibers
US5075068A (en) * 1990-10-11 1991-12-24 Exxon Chemical Patents Inc. Method and apparatus for treating meltblown filaments
US5240479A (en) * 1991-05-17 1993-08-31 Donaldson Company, Inc. Pleated filter media having a continuous bead of adhesive between layers of filtering material
US5470470A (en) * 1992-02-10 1995-11-28 Leyat Fils Marketing Sa Liquid filter fiber module disposed in an inflatable belt
US5389175A (en) * 1992-07-18 1995-02-14 Filterwerk Mann & Hummel Gmbh Method of manufacturing a pleated filter material
US5605748A (en) * 1993-01-22 1997-02-25 Monsanto Enviro-Chem Systems, Inc. Fiber beds for fiber bed mist eliminators
US5496507A (en) * 1993-08-17 1996-03-05 Minnesota Mining And Manufacturing Company Method of charging electret filter media
US5523033A (en) * 1993-12-08 1996-06-04 The Board Of Regents Of The University Of Oklahoma Polymer processing using pulsating fluidic flow
US5405559A (en) * 1993-12-08 1995-04-11 The Board Of Regents Of The University Of Oklahoma Polymer processing using pulsating fluidic flow
US5695487A (en) * 1994-09-09 1997-12-09 Kimberly-Clark Worldwide, Inc. Z-directon liquid transport medium
US5657750A (en) * 1994-10-04 1997-08-19 Irad Technologies Ltd. Fluid filtering device utilizable with gas monitors
US6136409A (en) * 1995-02-20 2000-10-24 Toray Industries, Inc. Nonwoven fabric, filter medium and process for producing the same
US5811178A (en) * 1995-08-02 1998-09-22 Kimberly-Clark Worldwide, Inc. High bulk nonwoven sorbent with fiber density gradient
US5652048A (en) * 1995-08-02 1997-07-29 Kimberly-Clark Worldwide, Inc. High bulk nonwoven sorbent
US5667749A (en) * 1995-08-02 1997-09-16 Kimberly-Clark Worldwide, Inc. Method for the production of fibers and materials having enhanced characteristics
US5908598A (en) * 1995-08-14 1999-06-01 Minnesota Mining And Manufacturing Company Fibrous webs having enhanced electret properties
US5709735A (en) * 1995-10-20 1998-01-20 Kimberly-Clark Worldwide, Inc. High stiffness nonwoven filter medium
US5665278A (en) * 1996-01-17 1997-09-09 J & M Laboratories, Inc. Airless quench method and apparatus for meltblowing
US5772948A (en) * 1996-11-19 1998-06-30 Plastaflex Corporation Melt-blown fiber system with pivotal oscillating member and corresponding method
US5782944A (en) * 1997-03-18 1998-07-21 Purolator Products Air Filtration Company Moisture resistant air filter
US5785725A (en) * 1997-04-14 1998-07-28 Johns Manville International, Inc. Polymeric fiber and glass fiber composite filter media
US5820645A (en) * 1997-05-23 1998-10-13 Reemay, Inc. Pleatable nonwoven composite article for gas filter media
US6102039A (en) * 1997-12-01 2000-08-15 3M Innovative Properties Company Molded respirator containing sorbent particles
US6398847B1 (en) * 1998-07-02 2002-06-04 3M Innovative Properties Company Method of removing contaminants from an aerosol using a new electret article
US6397458B1 (en) * 1998-07-02 2002-06-04 3M Innovative Properties Company Method of making an electret article by transferring fluorine to the article from a gaseous phase
US6409806B1 (en) * 1998-07-02 2002-06-25 3M Innovative Properties Company Fluorinated electret
US6165244A (en) * 1999-03-13 2000-12-26 Aaf International, Inc. Filter media with fluid stream positioned fibers
US6521011B1 (en) * 1999-07-15 2003-02-18 3M Innovative Properties Company Self-supporting pleated filter and method of making same
US20030089090A1 (en) * 1999-07-15 2003-05-15 3M Innovative Properties Company Method of making self-supporting pleated filter
US20030089091A1 (en) * 1999-07-15 2003-05-15 3M Innovative Properties Company Self-supporting pleated filter
USD449100S1 (en) * 2000-08-25 2001-10-09 3M Innovative Properties Company HVAC filter

Cited By (78)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100043639A1 (en) * 2005-10-19 2010-02-25 3M Innovative Properties Company Highly charged, charge stable nanofiber web
US7691168B2 (en) 2005-10-19 2010-04-06 3M Innovative Properties Company Highly charged, charge stable nanofiber web
US20080011303A1 (en) * 2006-07-17 2008-01-17 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
US9770058B2 (en) 2006-07-17 2017-09-26 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
US10575571B2 (en) 2006-07-17 2020-03-03 3M Innovative Properties Company Flat-fold respirator with monocomponent filtration/stiffening monolayer
WO2008085545A2 (en) 2006-07-31 2008-07-17 3M Innovative Properties Company Method for making shaped filtration articles
WO2008016788A1 (en) 2006-07-31 2008-02-07 3M Innovative Properties Company Pleated filter with monolayer monocomponent meltspun media
US8506669B2 (en) 2006-07-31 2013-08-13 3M Innovative Properties Company Pleated filter with monolayer monocomponent meltspun media
US8372175B2 (en) 2006-07-31 2013-02-12 3M Innovative Properties Company Pleated filter with bimodal monolayer monocomponent media
US20080022642A1 (en) * 2006-07-31 2008-01-31 Fox Andrew R Pleated filter with monolayer monocomponent meltspun media
US20090315224A1 (en) * 2006-07-31 2009-12-24 Angadjivand Seyed A Method for making shaped filtration articles
US8506871B2 (en) 2006-07-31 2013-08-13 3M Innovative Properties Company Process of making a monocomponent non-woven web
US8029723B2 (en) 2006-07-31 2011-10-04 3M Innovative Properties Company Method for making shaped filtration articles
US20080022643A1 (en) * 2006-07-31 2008-01-31 Fox Andrew R Pleated filter with bimodal monolayer monocomponent media
US7754041B2 (en) 2006-07-31 2010-07-13 3M Innovative Properties Company Pleated filter with bimodal monolayer monocomponent media
US20100201041A1 (en) * 2006-07-31 2010-08-12 3M Innovative Properties Company Monocomponent monolayer meltblown web and meltblowing apparatus
US20100229516A1 (en) * 2006-07-31 2010-09-16 3M Innovative Properties Company Pleated filter with bimodal monolayer monocomponent media
US7902096B2 (en) 2006-07-31 2011-03-08 3M Innovative Properties Company Monocomponent monolayer meltblown web and meltblowing apparatus
US7947142B2 (en) 2006-07-31 2011-05-24 3M Innovative Properties Company Pleated filter with monolayer monocomponent meltspun media
US20080026659A1 (en) * 2006-07-31 2008-01-31 3M Innovative Properties Company Monocomponent Monolayer Meltblown Web And Meltblowing Apparatus
US20110185903A1 (en) * 2006-07-31 2011-08-04 3M Innovative Properties Company Pleated filter with monolayer monocomponent meltspun media
US20080057263A1 (en) * 2006-09-06 2008-03-06 Shinih Enterprise Co., Ltd. Fibrous pad structure having a variable density
US7517378B2 (en) 2007-01-09 2009-04-14 Knapp Steven E Integral rigid edging for synthetic air filters
US9517430B2 (en) 2007-02-02 2016-12-13 Donaldson Company, Inc. Air filtration media pack, filter element, air filtration media, and methods
US10786774B2 (en) 2007-02-02 2020-09-29 Donaldson Company, Inc. Air filtration media pack, filter element, air filtration media, and methods
US11612845B2 (en) 2007-02-02 2023-03-28 Donaldson Company, Inc. Air filtration media pack, filter element, air filtration media, and methods
US9433884B2 (en) 2007-06-26 2016-09-06 Donaldson Company, Inc. Filtration media pack, filter element, and methods
US11298645B2 (en) 2007-06-26 2022-04-12 Donaldson Company, Inc. Filtration media pack, filter element, and methods
US10525397B2 (en) 2007-06-26 2020-01-07 Donaldson Company, Inc. Filtration media pack, filter element, and methods
US8608817B2 (en) * 2007-11-09 2013-12-17 Hollingsworth & Vose Company Meltblown filter medium
US20090120048A1 (en) * 2007-11-09 2009-05-14 Hollingsworth & Vose Company Meltblown Filter Medium
US8986432B2 (en) 2007-11-09 2015-03-24 Hollingsworth & Vose Company Meltblown filter medium, related applications and uses
US9808752B2 (en) 2008-02-04 2017-11-07 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media
US20090241490A1 (en) * 2008-03-30 2009-10-01 Lack Nicholas L Filter with multiple sections of different media
US8007555B2 (en) * 2008-03-30 2011-08-30 Lack Nicholas L Filter with multiple sections of different media
US9084957B2 (en) 2008-07-25 2015-07-21 Donaldson Company, Inc. Pleated filtration media, media packs, filter elements, and methods for filtering fluids
US10946313B2 (en) 2008-07-25 2021-03-16 Donaldson Company, Inc. Pleated filtration media, media packs, filter elements, and methods for filtering fluids
US20100078379A1 (en) * 2008-07-25 2010-04-01 Donaldson Company, Inc. Pleated filtration media, media packs, filter elements, and methods for filtering fluids
US9855519B2 (en) 2008-07-25 2018-01-02 Donaldson Company, Inc. Pleated filtration media, media packs, filter elements, and methods for filtering fluids
US9682512B2 (en) 2009-02-06 2017-06-20 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
US10625472B2 (en) 2009-02-06 2020-04-21 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
US9732454B2 (en) 2009-02-06 2017-08-15 Nike, Inc. Textured elements incorporating non-woven textile materials and methods for manufacturing the textured elements
US9579848B2 (en) 2009-02-06 2017-02-28 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
US10138582B2 (en) 2009-02-06 2018-11-27 Nike, Inc. Thermoplastic non-woven textile elements
US10174447B2 (en) 2009-02-06 2019-01-08 Nike, Inc. Thermoplastic non-woven textile elements
US8850719B2 (en) 2009-02-06 2014-10-07 Nike, Inc. Layered thermoplastic non-woven textile elements
US9227363B2 (en) 2009-02-06 2016-01-05 Nike, Inc. Thermoplastic non-woven textile elements
US10982363B2 (en) 2009-02-06 2021-04-20 Nike, Inc. Thermoplastic non-woven textile elements
US10982364B2 (en) 2009-02-06 2021-04-20 Nike, Inc. Thermoplastic non-woven textile elements
US10131091B2 (en) 2009-02-06 2018-11-20 Nike, Inc. Methods of joining textiles and other elements incorporating a thermoplastic polymer material
US20120246907A1 (en) * 2009-03-24 2012-10-04 Lee Pendleton Morgan Canister air filter and method for fabricating the same
US8540791B2 (en) * 2009-03-24 2013-09-24 Camfil Farr, Inc. Canister air filter and method for fabricating the same
US9950284B2 (en) 2009-04-03 2018-04-24 Hollingsworth & Vose Company Filter media suitable for hydraulic applications
US10682595B2 (en) 2009-04-03 2020-06-16 Hollingsworth & Vose Company Filter media suitable for hydraulic applications
US8950587B2 (en) 2009-04-03 2015-02-10 Hollingsworth & Vose Company Filter media suitable for hydraulic applications
US10363513B2 (en) 2009-08-03 2019-07-30 Donaldson Company, Inc. Method and apparatus for forming fluted filtration media having tapered flutes
US11413563B2 (en) 2010-01-25 2022-08-16 Donaldson Company, Inc. Pleated filtration media having tapered flutes
US10058812B2 (en) 2010-01-25 2018-08-28 Donaldson Company, Inc. Pleated filtration media having tapered flutes
US20110186504A1 (en) * 2010-01-25 2011-08-04 Donaldson Company, Inc. Pleated filtration media having tapered flutes
US10155187B2 (en) 2010-04-27 2018-12-18 Hollingsworth & Vose Company Filter media with a multi-layer structure
US9283501B2 (en) 2010-04-27 2016-03-15 Hollingsworth & Vose Company Filter media with a multi-layer structure
US10874962B2 (en) 2010-12-17 2020-12-29 Hollingsworth & Vose Company Fine fiber filter media and processes
US10653986B2 (en) 2010-12-17 2020-05-19 Hollingsworth & Vose Company Fine fiber filter media and processes
US11458427B2 (en) 2010-12-17 2022-10-04 Hollingsworth & Vose Company Fine fiber filter media and processes
US10155186B2 (en) 2010-12-17 2018-12-18 Hollingsworth & Vose Company Fine fiber filter media and processes
US11779071B2 (en) 2012-04-03 2023-10-10 Nike, Inc. Apparel and other products incorporating a thermoplastic polymer material
US8906275B2 (en) 2012-05-29 2014-12-09 Nike, Inc. Textured elements incorporating non-woven textile materials and methods for manufacturing the textured elements
US9694306B2 (en) 2013-05-24 2017-07-04 Hollingsworth & Vose Company Filter media including polymer compositions and blends
US10994235B2 (en) 2014-03-21 2021-05-04 3M Innovative Properties Company Refillable air filter assembly
US10328371B2 (en) 2014-03-21 2019-06-25 3M Innovative Properties Company Refillable air filter assembly
WO2016119080A1 (en) * 2015-01-29 2016-08-04 3M Innovative Properties Company Conformable pleated air filter with bridging filaments
US9982367B2 (en) * 2015-04-27 2018-05-29 Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik Method and apparatus for making a nonwoven fabric from thermoplastic filaments
US11369910B2 (en) * 2017-04-11 2022-06-28 Cummins Filtration Ip, Inc. Panel filter element
US20190247777A1 (en) * 2018-02-09 2019-08-15 American Air Filter Company, Inc. Method and Apparatus for Providing Test Ports
CN111818985A (zh) * 2018-02-09 2020-10-23 美国空气过滤器股份有限公司 用于提供测试端口的方法和设备
US11478737B2 (en) 2018-02-09 2022-10-25 American Air Filter Company, Inc. Method and apparatus for providing test ports
US12017177B2 (en) 2022-04-11 2024-06-25 Donaldson Company, Inc. Filtration media pack, filter element, and methods
CN114733282A (zh) * 2022-04-24 2022-07-12 廊坊坤合过滤器材有限公司 一种折叠式天然气滤芯

Also Published As

Publication number Publication date
US20060246260A1 (en) 2006-11-02
EP1732664B1 (en) 2009-07-29
CN1960792A (zh) 2007-05-09
CN100553734C (zh) 2009-10-28
WO2005102497A1 (en) 2005-11-03
JP2007531617A (ja) 2007-11-08
RU2006133410A (ru) 2008-05-20
US20100050582A1 (en) 2010-03-04
US8142538B2 (en) 2012-03-27
BRPI0509031A (pt) 2007-08-07
ATE437689T1 (de) 2009-08-15
EP1732664A1 (en) 2006-12-20
KR20070004823A (ko) 2007-01-09
US7622063B2 (en) 2009-11-24
DE602005015690D1 (de) 2009-09-10

Similar Documents

Publication Publication Date Title
US7622063B2 (en) Pleated aligned web filter
US6858297B1 (en) Aligned fiber web
US8372175B2 (en) Pleated filter with bimodal monolayer monocomponent media
JP5362560B2 (ja) 単層単成分メルトスパン媒体を有するひだ付け加工フィルタ
JP5539877B2 (ja) 改良されたプリーツ付きナノウェブ構造体
US20160206984A1 (en) Melt-spinning process, melt-spun nonwoven fibrous webs and related filtration media
US10814261B2 (en) Electret-containing filter media
KR20120092551A (ko) 고 로프트 스펀본디드 웨브
US20220054961A1 (en) Electret-containing filter media
CN112888492A (zh) 包括再蓬松纺粘幅材的空气过滤介质以及制备和使用方法
US12017175B2 (en) Pleated air filter with bridging filaments and continuous-contact filaments
US20210229022A1 (en) Pleated air filter with bridging filaments and continuous-contact filaments
JP2024040961A (ja) フィルター用積層濾材

Legal Events

Date Code Title Description
AS Assignment

Owner name: 3M INNOVATIVE PROPERTIES COMPANY, MINNESOTA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUNDET, DOUGLAS C.;SJAH, RAHUL;BRANDNER, JOHN M.;AND OTHERS;REEL/FRAME:015187/0821

Effective date: 20040405

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION