WO1994022553A1 - Cartouche a membrane pour filtre de mise a l'air - Google Patents

Cartouche a membrane pour filtre de mise a l'air Download PDF

Info

Publication number
WO1994022553A1
WO1994022553A1 PCT/US1993/004161 US9304161W WO9422553A1 WO 1994022553 A1 WO1994022553 A1 WO 1994022553A1 US 9304161 W US9304161 W US 9304161W WO 9422553 A1 WO9422553 A1 WO 9422553A1
Authority
WO
WIPO (PCT)
Prior art keywords
cartridge
filter cartridge
filter
membrane
support screen
Prior art date
Application number
PCT/US1993/004161
Other languages
English (en)
Inventor
Stephen Stark
Original Assignee
W.L. Gore & Associates, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W.L. Gore & Associates, Inc. filed Critical W.L. Gore & Associates, Inc.
Priority to AU40351/93A priority Critical patent/AU4035193A/en
Publication of WO1994022553A1 publication Critical patent/WO1994022553A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1692—Other shaped material, e.g. perforated or porous sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/02—Non-permanent measures for connecting different parts of the filter
    • B01D2265/027—Quick closing means for, e.g. filter heads, caps, maintenance openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
    • B01D2279/35—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for venting arrangements

Definitions

  • the invention relates to vent filters for pneumatic conveying systems which transfer particulate materials, such as grains, powders, or dusts through lines between supply tanks and silos to other tanks, reactors, and the like, by air flow under positive or negative pressure.
  • Pneumatic conveying systems are well known in the art and involve the movement of particulate materials of quite variable sizes such as small pieces of minerals, beads, grains, powder, and dust.
  • the particles are usually contained in tanks or silos and are moved through conduit or pipe transfer lines to other locations, such as smaller tanks, feed chambers, bins, holding receptacles for package loading lines, and many other forms. Both low pressure, high pressure, low flow rate, high flow rate, intermittent flow, and continuous flow are utilized.
  • the particulate material is allowed to flow into a transfer line where it is picked up and pushed or pulled by a stream of air through the line to another receptacle.
  • vent filter of the invention is designed to control this leakage while at the same time allowing the air carrying the particles being transported to escape through the filter.
  • the invention comprises a membrane vent filter cartridge constructed of a top cap and a bottom cap between which are fixed into place a cylindrical pleated filter medium inside a support screen to hold the filter medium in place inside it under the pressure of air flowing through it from inside the tank or vessel to which it is attached.
  • Both the top cap and bottom cap may have valved attachment and access means to control air flow and access for cleaning purposes or for aiding the operation of the transport systems.
  • the pleated filter membrane is formed by adhering together a porous polymer membrane and a fibrous textile fiber non-woven backing sheet or felt, the porous polymer membrane being on the inside of the medium facing the interior of the vent filter and the material being filtered.
  • the pores of the membrane are of a size to completely block the passage of the particles being filtered.
  • Surface filtration rather than in-depth filtration, is important to the function of the invention, in that surface filtration allows easy removal of collected dust from the inside of the vent filter and reuse of the filter, rather than the necessary replacement and discard of an in-depth type filter.
  • a preferred membrane material is expanded polytetrafluoroethylene, which has a hydrophobic surface. Particles tend not to adhere to it. It is generally resistant to abrasion, heat, and chemical attack.
  • the top and bottom caps may be of metal or plastic, the potting material may be any customarily used in the art for such purposes, and the support screen may be made from plastic or metal, apertured sheet, woven strands, or slit and expanded sheet.
  • Figure 1 is a partially broken perspective view of the vent filter cartridge of the invention to show interior layers.
  • Figure 2 is a broken perspective view of the vent filter cartridge of the invention with an attachment tube held into the throat of the top cap of the cartridge by a jam nut.
  • Figure 3 is a broken perspective view of the cartridge with a valved inlet-outlet tube for access to the cartridge for cleaning it.
  • Figure 4 is a schematic diagram of an assembly of two vent filter cartridges of the invention fitted in place on a pneumatic particle conveying system.
  • Figure 1 describes the basic membrane vent filter cartridge of the invention which has a pleated filter medium (made up of 3 and 4) housed between a top cap 2 and a bottom cap I .
  • the medium is inside support screen 5.
  • Support screen 5_ and the filter medium are potted into top 2 and bottom caps I by a standard method with materials known in the art.
  • Figure 1 shows the various layers broken away to show the layers of support screen 5 and the pleated filter medium.
  • the pleated filter medium has an inside layer of porous polymer membrane 3. Adhered to the membrane is a fibrous textile backing layer 4. Membrane 3 and backing layer 4 together make up a sheet of the filter medium.
  • the sheets are pleated and folded into a generally cylindrical shape, which has the edges adhered together with an adhesive or heat bonding to seal the edges together into a cylinder, porous membrane 3 facing into the cylinder, support backing layer 4 facing out.
  • the cylinder of filter medium is inserted inside a cylindrical support screen 5, and the medium and screen 5 potted as a unit into the top 2 and bottom caps I.
  • the top cap 2 and bottom cap ⁇ may be either metal or plastic as needed to meet the conditions under which the cartridge will be used.
  • the filter medium layer of porous membrane 3 is preferably of a low surface energy material, and often is hydrophobic as well.
  • a preferred material for the membrane is expanded polytetrafluoroethylene (ePTFE), which is described in U.S. Patents 3,953,566, 3,962,153, 4,096,227, 4,187,390, 4,902,423, and 4,478,665, assigned to W. L. Gore & Associates, Inc. Other equivalent materials may be used.
  • the backing layer 4 adhered to the porous membrane layer 3 can be a non-woven sheet of polymer fibers, such as polyester, polyamide, polypropylene, polysulfone, polyether ether ketone, polycarbonate, fluorinated hydrocarbon, or other suitable fiber.
  • polymer fibers such as polyester, polyamide, polypropylene, polysulfone, polyether ether ketone, polycarbonate, fluorinated hydrocarbon, or other suitable fiber.
  • the support screen 5, with the cylinder of filter medium inside it, is potted as a unit in the top cap 2 and bottom cap I with one of the usual materials for that purpose, such as rubber, urethane rubber, silicone rubber, epoxy resin, or a plastisol, for example.
  • Figure 2 shows in a broken perspective view a top portion of the vent filter of the invention fitted with a molded plastic screw fitting JJ. which fits inside the center aperture of the top cap 2 and is held in place by a jam nut J_0 which is screwed over fitting JJ until it rests against cap 2 to clamp cap 2 and fitting JJ. together.
  • An expanded metal support screen 5 is shown on this cartridge.
  • Figure 3 describes in a broken perspective view a bottom cap 1 of a cartridge fitted with a screw-threaded fitting 1 which embodies a valve 13 for quick opening and closing the cartridge by throwing lever J4-
  • FIG 4 is a schematic drawing of a pneumatic particle conveying system with two vent filter cartridges 20 fixed in place to vent air or other gases from silo 21 and bin 26 and to block any particles or dust from leaking out of the system at the same time.
  • Dusty particles 23 are stored in silo 2_1 with filter cartridge 2J) in place to let air in and out, but filtering out any dust 27.
  • a source of air 24 pushes air into the conveying tube 22, as central valve 2j> is opened and the requisite amount of particles 23 blown over into bin 26 via tube £2.
  • the dust particles 27 cannot escape through vent filter cartridge 20 as excess air flows out of the cartridge as bin 26 fills with particles 2 . to displace the air therein.
  • a cartridge was constructed from a sheet of a 6 oz./yd. spun bonded polyester backing laminated with a layer of expanded polytetrafluoroethylene (ePTFE).
  • the measured permeability of this filtration laminate was 6.0 cubic feet per minute per square foot at a pressure drop of 0.5 inches w.g. It had pleats 1 inch deep and the filter contained a total of 51 pleats.
  • the total filter area was 8.3 square feet.
  • This flat pleated sheet was cut and formed into a cylindrical shape and the ends sealed such that the ePTFE membrane was facing inward toward the center of the cylinder.
  • a core was constructed with 24 gauge, expanded 304 stainless steel, by cutting a rectangular sheet 12 inches wide by 19 inches long.
  • a cylinder was formed of this sheet by rolling the sheet and overlapping the ends by 1-3/4 inches. The overlap was spot welded to form a core 12 inches long with an outside diameter of 5.5 inches.
  • the vent filter cartridge was assembled by pouring 1/2 pound of polyvinyl chloride primerless plastisol potting compound into a galvanized steel end cap with an outside diameter of 5-9/16 inches and an inside diameter of 3-3/16 inches. The metal core was then inserted into the potting compound just inside the outer lip of the end cap.
  • the filter medium was then inserted into the inside of the metal core.
  • the potting compound was cured on a hot plate at 385°F. for 25 minutes. After the top of the filter was assembled, the potting process was repeated on the bottom end using a closed galvanized steel end cap with an outside diameter of 5-9/16 inches. After both ends of the filter were potted and cured, a 3/16 inch thick neoprene foam gasket was attached to the top end cap using pressure sensitive adhesive.
  • the vent filter cartridge was bolted to a metal flange with two 1/4 inch diameter x 1 inch long bolts attached to the top of the cartridge.
  • the metal flange was constructed with a 1/4 inch thick carbon steel disc with an outside diameter of 5-9/16 inch.
  • a piece of standard 2 inch I.D. pipe was press fit into a hole cut in the center of the disc.
  • the cartridge with the flange assembly attached was then screwed into a pneumatic conveying pressure vessel built by Macawber Engineering, Inc., Marysville, TN.
  • This 40-gallon pressure vessel was charged with 15 pounds of xerographic toner dust, then pressurized to 15 pounds per square inch.
  • the exit valve was opened, allowing the toner dust to flow into the pipe exiting at the bottom of the vessel. After the toner dust was transferred through the exit line, a pressure of 2 pounds per square inch remained in the vessel.
  • This pressure was reduced to ambient pressure by bleeding air through an exhaust valve diaphragm into the cartridge vent filter.
  • the toner dust entrained in the air during the exhaust procedure was captured on the inside of the cartridge vent filter.
  • the air passed through the filter media into the area surrounding the equipment. The filling, pressuring, transfer, and exhaust cycle occurred every 20 minutes while the equipment was operating.
  • the cartridge vent filter was tested over a four-week period during which no toner dust was detected leaking through the media or around the seals. The filter was then removed to determine the amount of toner dust collected inside the filter. A total of 350g of toner dust was removed from inside the filter by turning it upside down and tapping the bottom end cap. After cleaning out the toner dust, the filter was re-attached to the pressure vessel and continued to perform as before.
  • particles of a material such as a xerographic toner or a noxious chemical powder
  • a material such as a xerographic toner or a noxious chemical powder

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Une cartouche à membrane pour filtre de mise à l'air combinée avec un système pneumatique de convoyage de particules et conçue pour maintenir la poussière de particules nocives ou sales à l'intérieur du système, tout en filtrant le débit d'air entrant ou sortant du système. Une membrane polymère poreuse (3), en particulier en polytétrafluoroéthylène expansé, renforcée par des fibres (4) d'un textile non tissé et un tamis de support à ouvertures (5) filtrent efficacement les poussières des toners, des pigments, des produits chimiques nocifs et des éléments similaires.
PCT/US1993/004161 1993-03-29 1993-05-04 Cartouche a membrane pour filtre de mise a l'air WO1994022553A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40351/93A AU4035193A (en) 1993-03-29 1993-05-04 Membrane vent filter cartridge

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3877093A 1993-03-29 1993-03-29
US08/038,770 1993-03-29

Publications (1)

Publication Number Publication Date
WO1994022553A1 true WO1994022553A1 (fr) 1994-10-13

Family

ID=21901798

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1993/004161 WO1994022553A1 (fr) 1993-03-29 1993-05-04 Cartouche a membrane pour filtre de mise a l'air

Country Status (2)

Country Link
AU (1) AU4035193A (fr)
WO (1) WO1994022553A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996014913A1 (fr) * 1994-11-14 1996-05-23 W.L. Gore & Associates, Inc. Cartouche filtrante rendue hydrophile et procede pour la fabriquer
GB2339707A (en) * 1998-07-23 2000-02-09 Pall Corp Filter assemblies
EP1746698A1 (fr) 2005-07-19 2007-01-24 Axel R. Hidde Presse étoupe avec valve à membrane
DE102005035210B4 (de) * 2005-07-28 2007-09-06 Hidde, Axel R., Dr. Ing. Kabeldurchführung mit Membranventil
US7837756B2 (en) 2007-04-05 2010-11-23 Aaf-Mcquay Inc. Filter with ePTFE and method of forming
DE102005047662B4 (de) * 2005-09-22 2012-02-16 Axel R. Hidde Druckausgleichsverschraubung mit Druckausgleichselement
CN102961931A (zh) * 2012-10-23 2013-03-13 青岛圣沃德电器有限公司 一种微粒分离器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160168A2 (fr) * 1984-03-15 1985-11-06 W.L. Gore & Associates, Inc. Cartouche de filtre à gaz
FR2580263A1 (fr) * 1985-04-16 1986-10-17 Spitzer Silo Fahrzeugwerk Gmbh Installation a air comprime pour le vidage du silo d'un vehicule a silo pour matiere en vrac apte a l'ecoulement
EP0246917A2 (fr) * 1986-05-23 1987-11-25 W.L. Gore & Associates, Inc. Filtre à gaz de haute performance
US4848990A (en) * 1988-06-06 1989-07-18 Matsui Manufacturing Co., Ltd. Dust collector adapted for use in a hopper dryer
JPH04235705A (ja) * 1991-01-17 1992-08-24 Yuasa Corp カートリッジフィルタの製造法
US5207812A (en) * 1992-05-08 1993-05-04 W. L. Gore & Associates, Inc. Filter cartridge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160168A2 (fr) * 1984-03-15 1985-11-06 W.L. Gore & Associates, Inc. Cartouche de filtre à gaz
FR2580263A1 (fr) * 1985-04-16 1986-10-17 Spitzer Silo Fahrzeugwerk Gmbh Installation a air comprime pour le vidage du silo d'un vehicule a silo pour matiere en vrac apte a l'ecoulement
EP0246917A2 (fr) * 1986-05-23 1987-11-25 W.L. Gore & Associates, Inc. Filtre à gaz de haute performance
US4848990A (en) * 1988-06-06 1989-07-18 Matsui Manufacturing Co., Ltd. Dust collector adapted for use in a hopper dryer
JPH04235705A (ja) * 1991-01-17 1992-08-24 Yuasa Corp カートリッジフィルタの製造法
US5207812A (en) * 1992-05-08 1993-05-04 W. L. Gore & Associates, Inc. Filter cartridge
US5207812B1 (en) * 1992-05-08 1996-10-01 Gore & Ass Filter cartridge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 16, no. 584 (C - 1013) 24 December 1992 (1992-12-24) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996014913A1 (fr) * 1994-11-14 1996-05-23 W.L. Gore & Associates, Inc. Cartouche filtrante rendue hydrophile et procede pour la fabriquer
GB2339707A (en) * 1998-07-23 2000-02-09 Pall Corp Filter assemblies
GB2339707B (en) * 1998-07-23 2002-05-22 Pall Corp Filter assemblies
US6494936B1 (en) 1998-07-23 2002-12-17 Pall Corporation Filter assemblies
EP1746698A1 (fr) 2005-07-19 2007-01-24 Axel R. Hidde Presse étoupe avec valve à membrane
DE102005035210B4 (de) * 2005-07-28 2007-09-06 Hidde, Axel R., Dr. Ing. Kabeldurchführung mit Membranventil
DE102005047662B4 (de) * 2005-09-22 2012-02-16 Axel R. Hidde Druckausgleichsverschraubung mit Druckausgleichselement
US7837756B2 (en) 2007-04-05 2010-11-23 Aaf-Mcquay Inc. Filter with ePTFE and method of forming
US8152889B2 (en) 2007-04-05 2012-04-10 Aaf-Mcquay Inc. Filter with EPTFE and method of forming
CN102961931A (zh) * 2012-10-23 2013-03-13 青岛圣沃德电器有限公司 一种微粒分离器

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Publication number Publication date
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