US20060230727A1 - Filtration element having a variable density sidewall - Google Patents

Filtration element having a variable density sidewall Download PDF

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Publication number
US20060230727A1
US20060230727A1 US11/255,585 US25558505A US2006230727A1 US 20060230727 A1 US20060230727 A1 US 20060230727A1 US 25558505 A US25558505 A US 25558505A US 2006230727 A1 US2006230727 A1 US 2006230727A1
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US
United States
Prior art keywords
strands
sidewall
filtration
thickness
bag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/255,585
Inventor
Howard Morgan
Original Assignee
Morgan Howard W
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
Priority to US67289405P priority Critical
Application filed by Morgan Howard W filed Critical Morgan Howard W
Priority to US11/255,585 priority patent/US20060230727A1/en
Priority claimed from KR1020060035270A external-priority patent/KR20060110230A/en
Publication of US20060230727A1 publication Critical patent/US20060230727A1/en
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/16Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001Making filtering elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2201/00Details relating to filtering apparatus
    • B01D2201/18Filters characterised by the openings or pores
    • B01D2201/188Multiple filtering elements having filtering areas of different size
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10Multiple layers
    • B01D2275/105Wound layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2275/00Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/30Porosity of filtering material
    • B01D2275/305Porosity decreasing in flow direction

Abstract

A filtration element formed of overlapping fibrous strands or components. Those fibrous strands at the side of the filtration element which first receives the gas flow being of one thickness and those fibrous strands at the side of the filtration element where the gas flow exits being of a thickness substantially less than the one thickness of the strands at the opposite sidewall of the element.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This is a continuation-in-part of and claims the benefit of provisional application Ser. No. 60/672,894, filed Apr. 19, 2005.
  • SUMMARY OF THE INVENTION
  • This invention relates to a filtration element for gases and will have application to bag type filters.
  • In this invention, the filtration element was formed of overlapping fibrous strands or components with the strands varying in diameter or thickness, the largest of which is at the side of the filter which first receives the gas flow for filtration and the smallest of which is at the opposite side of the filter where the gas exists after passing through the filtration element. Further, the side of the filter which first receives the gas flow will generally be more rigid than the opposite side of the filter so as to provide a substantially incompressible surface.
  • Accordingly, it is an object of this invention to provide a filtration element which is of economical construction and which is of efficient operation.
  • Still another object of this invention is to provide a filtration element which is for gases and which provides for more even distribution of filtered particulate matter throughout the thickness of the element.
  • Other objects of the invention become apparent upon the reading of the following description.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a fragmentary perspective view showing an example of the apparatus which can be used to make the filtration element of this invention.
  • FIG. 2 is a side view of a filter element in the form of a bag having a portion of the bag sidewall broken away to illustrate in cross-section the filtration strands forming the sidewall of the filter bag.
  • FIG. 3 is a side view of the filter bag showing in illustrative form the varying thicknesses of the filtration strands.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The preferred embodiment herein described is not intended to be exhaustive or to limit the invention to precise form disclosed. It is chosen and described to explain the principles of the invention and its application and practical use to enable others skilled in the art to best utilize the invention.
  • This invention may be best understood by the following descriptions and the workings of the equipment which is used to produce the filter element, seen in the drawing as a filter bag 10. As illustrated in FIG. 1, a quantity of material, preferably polypropylene or other thermoplastic materials capable of producing filaments when molten and air dried, is introduced into an extruder 12 at hopper 14 and is fed through a nozzle 16. A plurality of ring heaters 18 circumscribe nozzle 16 and serve to produce heat sufficient to liquefy the thermoplastic material as it flows through the nozzle. Nozzle 16 terminates in a plurality of laterally spaced discharge outlets 22 through which the thermoplastic material in its molten state is propelled in melted and fibrous strands 20 by heated air from manifolds 23 toward a mandrel 28. Mandrel 28 may be formed from metal, wood or similar material and resembles in its outer configuration the intended shape of the filter bag 10 to be produced. Mandrel 28 is rotated about an axis 35 within the flow path of the fibrous strands 20 from nozzle discharge outlets 22. Normally, Mandrel 28 is placed between 1 to 3 feet from outlets 22 and rotated at a constant speed such as between 30 to 80 rpm. The fibrous material or strands 20 are sufficiently cooled as they reach the mandrel 28 so as to be formed about the mandrel in layers.
  • In this invention, the diameters of the strands 20 are varied as the thickness of the sidewall 32 of bag 10 increases. This is best illustrated in viewing FIGS. 2 and 3 where a section of the sidewall of the filter bag has been broken away for illustrative purposes. In FIG. 2 the strands 20 are shown in cross-section, the largest diameter strands being at the inside of the bag and the smallest diameter of the strands being at the outside of the bag with the gas flow through the bag being from the inside towards the outside of the bag. In FIG. 3, there is shown in illustrative form the varying thickness of the strands 20 with the strands becoming progressively thinner from the inside to the outside of the bag in the direction of gas flow through the bag. In this manner, the outer margin of the sidewall of the bag will have its strands more compactly layered so as to increase the degree of filtration as the outer edges of the bag are reached. Thus, the larger particulate matter being filtered from the gas will first become entrained within the filter bag closer to the inside of the bag with the smaller particulate matter becoming entrained closer to the outside of the bag. This will produce more even distribution of the filtered particulate matter throughout the bag.
  • The thickness of the strands 20 of bag 10 may range from 50 to 200 microns towards the inside of the bag and progressively become smaller in transverse dimension to 0.5 microns at the outside surface of the bag with the bag being approximately ¾ to 1 inch thick. The precise thickness or transverse dimension of the strands of the fibrous material and thickness of the bag can vary depending upon the type of material intended to be filtered and the size of the filter bag.
  • In producing filter bag 10, the thicker strands are first wound upon the mandrel and then as the bag's thickness progressively increases, the temperature produced by heaters 18 can be increased so as to make the thermoplastic material more molten with the air pressure produced at manifolds 23 increased, thus increasing the length of the strands and reducing their transverse dimension. In this manner, by selectively increasing the temperature of the molten thermoplastic material and/or increasing the air pressure by which the molten thermoplastic material is driven through and propelled from the nozzles, the thickness of the strands can be selectively varied as they are wound upon the mandrel to produce the sidewall of the filter bag or cartridge depending upon the type of filtration element being produced.
  • Also, in addition to varying the thickness of the strands, by varying the temperature of the molten thermoplastic material and/or varying the volume of air by which the material is driven through and propelled from the nozzles, the stiffness of the strands can be increased so that the inner wall section 20 a of the filter bag becomes stiff or rigid. Bag side walls may substantially collapse during use due to the gas pressure within the bag. This reduces the bag's permeability and filtering capacity. By rigidifying a wall section of the bag at the side where the gas first contacts, the bag strands remain open to provide intervals or voids between the strands to catch or entrain filtered particles. The depth of wall section 20 a can vary, even extending the entire thickness of the filter bag, depending upon the filtration characteristics desired.
  • The invention is not to be limited to the details above given but may be modified within the scope of the appended claims.

Claims (7)

1. A filtration element comprising a sidewall part, said sidewall part having a first side which the gas flow through the element first contacts and a second side from which said gas flow exits said element, said sidewall part including overlapping fibrous strands, those said strands at said sidewall part first side being of one thickness and those said strands at said sidewall part second side being of a thickness substantially less than the thickness of said sidewall part first side.
2. The filtration element of claim 1 wherein said strands vary progressively in transverse dimension from said sidewall part first side to said sidewall part second side.
3. The filtration element of claim 1 or 2 wherein said strands vary regressively in rigidity from said sidewall part first side toward said sidewall part second side to form a substantially rigid sidewall part at said first side.
4. A method of forming a filtration element comprising the steps of:
a. expelling thermoplastic material through a nozzle by gas pressure to form strands of fibrous material,
b. heating said material prior to its expulsion from said nozzle,
c. forming said strands of fibrous material into a sidewall of said filtration element, and
d. varying the thickness of said strands with the thicker of the strands being at the side of the filtration element where the gas flow through the element first flows.
5. The method of claim 4 wherein step a includes varying the gas pressure through said nozzle to vary the thickness of said strands.
6. The method of claim 4 wherein step b includes varying the temperature of said material prior to its expulsion from said nozzle to vary the thickness of said strands.
7. The method of claim 4 wherein step d includes varying the stiffness of the strands at the side of the filtration element where the gas flow through the element first flows.
US11/255,585 2005-04-19 2005-10-21 Filtration element having a variable density sidewall Abandoned US20060230727A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US67289405P true 2005-04-19 2005-04-19
US11/255,585 US20060230727A1 (en) 2005-04-19 2005-10-21 Filtration element having a variable density sidewall

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
US11/255,585 US20060230727A1 (en) 2005-04-19 2005-10-21 Filtration element having a variable density sidewall
EP06007668A EP1728543A3 (en) 2005-04-19 2006-04-12 Filtration element having a variable density sidewall
JP2006115750A JP2006297389A (en) 2005-04-19 2006-04-19 Filter element having variable-density side wall
CNA2006100748361A CN1864803A (en) 2005-04-19 2006-04-19 Filtration element having a variable density sidewall
CA2544065A CA2544065C (en) 2005-04-19 2006-04-19 Filtration element having a variable density sidewall
BRPI0601299-0A BRPI0601299A (en) 2005-04-19 2006-04-19 filtration element having a variable density sidewall
KR1020060035270A KR20060110230A (en) 2005-04-19 2006-04-19 Filtration element having a variable density sidewall and method for manufacturing thereof
US11/735,852 US20070227968A1 (en) 2005-04-19 2007-04-16 Filtration element having a variable density sidewall
US12/759,461 US7955407B2 (en) 2005-04-19 2010-04-13 Filtration element having a variable density sidewall

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US67289405P Continuation 2005-04-19 2005-04-19

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/735,852 Continuation-In-Part US20070227968A1 (en) 2005-04-19 2007-04-16 Filtration element having a variable density sidewall

Publications (1)

Publication Number Publication Date
US20060230727A1 true US20060230727A1 (en) 2006-10-19

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US11/255,585 Abandoned US20060230727A1 (en) 2005-04-19 2005-10-21 Filtration element having a variable density sidewall
US12/759,461 Active US7955407B2 (en) 2005-04-19 2010-04-13 Filtration element having a variable density sidewall

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/759,461 Active US7955407B2 (en) 2005-04-19 2010-04-13 Filtration element having a variable density sidewall

Country Status (6)

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US (2) US20060230727A1 (en)
EP (1) EP1728543A3 (en)
JP (1) JP2006297389A (en)
CN (1) CN1864803A (en)
BR (1) BRPI0601299A (en)
CA (1) CA2544065C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106693554A (en) * 2017-01-23 2017-05-24 王宇轩 Air purifier based on silk thread filtration

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US5352517A (en) * 1986-03-24 1994-10-04 Ensci, Inc. Iron oxide coated substrates
US5665479A (en) * 1995-12-12 1997-09-09 N.V. Bekaert S.A. Sintered multilayer metal fiber web
US5725750A (en) * 1996-04-19 1998-03-10 Sumitomo Electric Industries, Ltd. Process for producing porous iron metal body
US6010604A (en) * 1998-02-04 2000-01-04 Stauffer; John E. Neural network packing
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US6171684B1 (en) * 1995-11-17 2001-01-09 Donaldson Company, Inc. Filter material construction and method
US6231646B1 (en) * 1999-03-11 2001-05-15 Chemco Manufacturing Company, Inc. Paint overspray exhaust air filter
US6387141B1 (en) * 1998-09-21 2002-05-14 Firma Carl Freudenberg Depth air filter having fibers intertwined by liquid-jetting
US6409785B1 (en) * 2000-08-07 2002-06-25 Bha Technologies, Inc. Cleanable HEPA filter media
US6485811B1 (en) * 1994-09-28 2002-11-26 Toray Industries, Inc. Nonwoven fabric for pleated filters, and a production process therefor
US20030084788A1 (en) * 2001-06-22 2003-05-08 Fraser Ladson L Foam coated air filtration media
US6585794B2 (en) * 2000-11-07 2003-07-01 Sumitomo Electric Industries, Ltd. Nonwoven metal fabric and method of making same
US20040211160A1 (en) * 2002-05-16 2004-10-28 Branofilter Gmbh Multi-layer filter structure and use of a multi-layer filter structure
US6926828B2 (en) * 2002-01-25 2005-08-09 Inoac Corporation Fluid filter
US20050235619A1 (en) * 2002-05-28 2005-10-27 Beate Heinz Filter medium
US20050279062A1 (en) * 2004-05-11 2005-12-22 Bernd Reinsch Device for cleaning gas mixtures and method for its manufacture

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US4116738A (en) * 1976-01-14 1978-09-26 Pall Corporation Continuous production of tubular modular filter elements using nonwoven webs from thermoplastic fibers and products
US5352517A (en) * 1986-03-24 1994-10-04 Ensci, Inc. Iron oxide coated substrates
US6485811B1 (en) * 1994-09-28 2002-11-26 Toray Industries, Inc. Nonwoven fabric for pleated filters, and a production process therefor
US6171684B1 (en) * 1995-11-17 2001-01-09 Donaldson Company, Inc. Filter material construction and method
US5665479A (en) * 1995-12-12 1997-09-09 N.V. Bekaert S.A. Sintered multilayer metal fiber web
US5725750A (en) * 1996-04-19 1998-03-10 Sumitomo Electric Industries, Ltd. Process for producing porous iron metal body
US6010604A (en) * 1998-02-04 2000-01-04 Stauffer; John E. Neural network packing
US6387141B1 (en) * 1998-09-21 2002-05-14 Firma Carl Freudenberg Depth air filter having fibers intertwined by liquid-jetting
US6231646B1 (en) * 1999-03-11 2001-05-15 Chemco Manufacturing Company, Inc. Paint overspray exhaust air filter
US6165244A (en) * 1999-03-13 2000-12-26 Aaf International, Inc. Filter media with fluid stream positioned fibers
US6409785B1 (en) * 2000-08-07 2002-06-25 Bha Technologies, Inc. Cleanable HEPA filter media
US6585794B2 (en) * 2000-11-07 2003-07-01 Sumitomo Electric Industries, Ltd. Nonwoven metal fabric and method of making same
US20030084788A1 (en) * 2001-06-22 2003-05-08 Fraser Ladson L Foam coated air filtration media
US6926828B2 (en) * 2002-01-25 2005-08-09 Inoac Corporation Fluid filter
US20040211160A1 (en) * 2002-05-16 2004-10-28 Branofilter Gmbh Multi-layer filter structure and use of a multi-layer filter structure
US20050235619A1 (en) * 2002-05-28 2005-10-27 Beate Heinz Filter medium
US20050279062A1 (en) * 2004-05-11 2005-12-22 Bernd Reinsch Device for cleaning gas mixtures and method for its manufacture

Also Published As

Publication number Publication date
CA2544065A1 (en) 2006-10-19
US7955407B2 (en) 2011-06-07
JP2006297389A (en) 2006-11-02
BRPI0601299A (en) 2006-12-19
CN1864803A (en) 2006-11-22
US20100193427A1 (en) 2010-08-05
EP1728543A2 (en) 2006-12-06
CA2544065C (en) 2013-05-21
EP1728543A3 (en) 2007-10-10

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