EP0537140B1 - Verfahren und vorrichtung zur herstellung eines mehrlagigen filtermaterials - Google Patents

Verfahren und vorrichtung zur herstellung eines mehrlagigen filtermaterials Download PDF

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Publication number
EP0537140B1
EP0537140B1 EP90909740A EP90909740A EP0537140B1 EP 0537140 B1 EP0537140 B1 EP 0537140B1 EP 90909740 A EP90909740 A EP 90909740A EP 90909740 A EP90909740 A EP 90909740A EP 0537140 B1 EP0537140 B1 EP 0537140B1
Authority
EP
European Patent Office
Prior art keywords
stock
forming
flow channels
wire
headbox
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.)
Revoked
Application number
EP90909740A
Other languages
English (en)
French (fr)
Other versions
EP0537140A1 (de
Inventor
Paul Olof Meinander
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
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=8556492&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0537140(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ahlstrom Corp filed Critical Ahlstrom Corp
Priority to AT90909740T priority Critical patent/ATE112596T1/de
Publication of EP0537140A1 publication Critical patent/EP0537140A1/de
Application granted granted Critical
Publication of EP0537140B1 publication Critical patent/EP0537140B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/009—Fibre-rearranging devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D21F1/20—Shaking apparatus for wire-cloths and associated parts in Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the present invention relates generally to a method and apparatus for manufacturing webs of multilayer filter materials on the wire of a multichannel inclined wire former and is directed, more particularly, to a novel method and apparatus for producing filter paper for use in air and oil filters which have a high filtration capability.
  • Multilayer filter papers can be made by forming the individual layers on the wires of individual web formers and couching them together.
  • U.S. patent No. 2,928,765 describes a process for the manufacture of a double-layered air filter paper on a web former using an inclined wire.
  • the process comprises the steps of forming a coarse-pored layer by flowing a slurry of a first slurry of fibers onto the inclined wire and forming a fine-pored layer by immediately thereafter flowing a second slurry of fibers onto the wire.
  • DE-AS No. 1220716 describes an apparatus for the manufacture of multilayer fibrous webs wherein the stocks are supplied to the inclined wire of a web former through a plurality of horizontally arranged individual channels.
  • the multilayer filter material When the multilayer filter material is formed on an inclined wire and the slurries of fibers for the different layers are applied one immediately after the other, an intermingling of the fibers at the interfaces between the layers is achieved. Due to the presence of the mixed zones, the filtration results of the filter material are positively influenced.
  • the multilayer filter is produced by couching together individual layers formed on the wires of individual web formers, no such intermingling of the fibers between the layers is caused.
  • the porosity grade and the basis weight are chosen so that, as regards the efficiency and the service life of the filter material, optimal values are achieved.
  • the object of the present invention is to provide a new and improved method and apparatus for the manufacture of webs of multilayered filter material, by means of which filter webs having better properties than webs hitherto formed, and which can more easily be adapted to meet a variety of requirements as regards the capacity, efficiency, bulkiness, lifetime, basis weight etc. of the filter material.
  • the method of the present invention comprises the steps of delivering stock to a forming wire having an inclined wire portion and a substantially horizontal wire portion, and forming layers of fibers in consecutive forming zones in each of which a layer of fibers, superimposed on the layer formed in the preceding forming zone, is to be formed. It is a characteristic feature of the method according to the invention that stocks of different grades are supplied to a plurality of stock chests and stock is fed from one or more selected stock chests to one or more selected flow channels.
  • the present invention is also directed to an apparatus for manufacturing webs of multilayer filter material, comprising a web former provided with a forming wire having at least one inclined wire portion and a horizontal or substantially horizontal wire portion, and a multichannel headbox in which the flow channels are arranged one above the other in such a way that the upper wall of one channel forms the lower wall of the flow channel above it, said flow channels leading to subsequent forming zones in each of which a layer of fibers, superimposed on the layer formed in the preceding forming zone, is to be formed.
  • the means for supplying stock to the headbox comprises a conduit and valve system by means of which stock from any one of the stock chests can be delivered to any one of the flow channels of the headbox.
  • Fig. 1 illustrates a web former 2 adapted for producing a multilayered filter paper. It comprises a forming fabric such as a wire 4 running in an endless loop around a breast roll 6 and a plurality of return rolls, guide rolls and stretch rolls 8 in a manner known per se.
  • the wire comprises an inclined wire portion 10 and a horizontal or substantially horizontal wire portion 12.
  • a headbox 14 is by means of partition walls 161 - 16 n divided into individual flow channels 181 -18 n facing the inclined wire.
  • Each flow channel has an upper wall and a lower wall and the upper wall 16 n of one channel 18 n-1 forms the lower wall of the flow channel 18 n on top of it.
  • the inclined wire portion is supported by a plurality of drainage rolls 201 - 20 n , which define a plurality of flat forming zones 221 - 22 n the inclination angle ⁇ of which decreases in the traveling direction A of the wire.
  • the location and length of each forming zone corresponds generally to the location and length of the portion 241-24 n of the wire on which fibers from a flow channel 181-18 n is deposited.
  • each flow channel leads to a flat forming zone having a different inclination angle.
  • the drainage roll 20 is shown more in detail in Figs 2 and 3.
  • the roll comprises a rotatable shaft 30 on which a plurality of discs 32 are disposed a distance apart from each other.
  • a plurality of longitudinal rods 34 are attached to the rims of the discs spaced apart from each other so as to form a roll having a very low flow resistance.
  • the roll allows the wire to move towards the roll center every time the gap between a successive pair of rods passes under the wire, which causes oscillation of the wire, whereby the formation and dewatering of the fiber layers on the wire are positively influenced.
  • each drainage box 26 there is a plurality of vacuum or suction drainage boxes 26 and in each drainage box, there is a plurality of drainage elements 28 such as deflector or hydrofoil or foil blades.
  • the drainage rolls are also disposed in the drainage boxes.
  • the flow to each flow channel is separately controlled by controlling the pressure in the respective drainage boxes.
  • the flow of stock to the flow channel is measured by a flow meter.
  • the flow of white water from the drainage boxes is measured by flow meters .
  • the level of the white water in the drainage boxes is controlled by level controller and valves.
  • a vacuum pump is connected to the drainage boxes.
  • a pressure controller is connected to the drainage box.
  • a flow controller is connected to the vacuum controller and the flow controller for the flow of white water.
  • An equilibrium is maintained between the volume flow of stock to the flow channel and the volume flow of white water from the drainage boxes, i.e. the quantity of liquid which is passing through the wire.
  • the quantity of stock which can be applied is limited by the drainage resistance of the fiber mat on the wire.
  • the filter paper is built up of a plurality of layers. Each layer is superimposed on the layer formed in the preceding forming zone. As the drainage resistance of the fiber mat increases from one forming zone to the next, the dewatering pressure has to increase correspondingly. However, as the inclination of the wire decreases in the traveling direction of the wire, the length of the forming zones increase towards the end of the inclined wire. This means that the available drainage time increases which compensates for the increasing drainage resistance.
  • the uppermost layer is formed on the horizontal wire from stock delivered by a flow channel 18 n+1 disposed on top of flow channel 18 n .
  • the stock for the last layer, as well as for all the other layers, is deposited on a sheet which is not yet fully formed, as shown in Fig. 4, so that there is caused an intermingling of the fibers at the interface.
  • the stock delivery system comprises a plurality of stock chests 521 - 52 n .
  • Each stock chest is connected to a stock pump 541 - 54 n through lines 561 - 56 n and 581 - 58 n which form stock circuits by means of which at least a portion of the stock withdrawn from each stock chest can be returned to it.
  • the white water from forming zone 22, is collected in a first white water saveall 601.
  • the white waters from the other forming zones 222 - 22 n are collected in a second white water saveall 602.
  • Each flow channel is connected to a mixing pump 621 - 62 n through a stock delivery line 641 - 64 n .
  • the mixing pump 621 is connected to the first white water saveall through a white water return line 661 and the mixing pumps 622 - 62 n are connected to the second white water through white water return lines 662 - 66 n so as to form a plurality of flow circuits.
  • the inlet of the first mixing pump 621 delivering stock to the first flow channel 181 is connected to each of the stock circuits through connecting lines 681 - 68 n .
  • the inlet of the second mixing pump 622 delivering stock to the second flow channel 182 is in a corresponding way connected to each of the stock circuits through lines (not shown) etc.
  • each of the connecting lines there is a valve 701 - 70 n by means of which stock from one or more selected stock chests can be delivered to one or more selected flow channels. This provides for a high flexibility of the operation of the multilayer filter paper machine.
  • the invention is typically put into practice in the production of 3-layered filter paper, two layers of which are formed on the inclined wire portion and the third on the horizontal portion of the forming web. Alternatively, all layers can be formed on the inclined wire.
  • the invention can be utilized in filter paper machines having an inclined wire portion the inclination angle of which is the same in all forming zones or a curved wire.

Landscapes

  • Paper (AREA)
  • Filtering Materials (AREA)

Claims (4)

  1. Verfahren zur Herstellung von Vliesbahnen aus mehrlagigem Filtermaterial, bestehend aus
    - Auftragung von Faserstoff auf ein Formiersieb mit einem geneigten Siebabschnitt und einen horizontalen oder im wesentlichen horizontalen Siebabschnitt,
    - Formieren von Faserschichten in aufeinanderfolgenden Formierzonen, in deren jeder eine der in der vorhergehenden Formierzone überlagerte Faserschicht gebildet wird, dadurch gekennzeichnet,
    - daß Faserstoff aus ein oder mehreren ausgewählten, Faserstoffe unterschiedlicher Qualitäten enthaltenden Stoffbütten in ein oder mehrere ausgewählte Strömungskanäle eingegeben wird.
  2. Vorrichtung zur Herstellung von Vliesbahnen aus mehrlagigem Filtermaterial, bestehend aus
    - einem Vliesformer, der mit einem Formiersieb versehen ist, das einen geneigten Siebabschnitt und einen horizontalen oder im wesentlichen horizontalen Siebabschnitt aufweist,
    - einem mehrkanäligen Stoffauflauf, wo die Strömungskanäle auf solche Weise übereinander angeordnet sind, daß die obere Wand eines Kanals die untere Wand des darauf befindlichen Strömungskanals bildet, welche Strömungskanäle zu aufeinanderfolgenden Formierzonen führen, in deren jeder eine einer in der vorhergehenden Formierzone gebildeten Schicht überlagerte Schicht formiert wird,
    - mindestens zwei Stoffbütten,
    - Mitteln zur Eingabe von Faserstoff zum Stoffauflauf,
    - Mitteln zum Einsammeln und Rückführen mindestens eines Teils des Siebwassers, das das Sieb während der Bildung der mehrlagigen Vliesbahn durchfließt, zum Vliesbildungsprozeß, dadurch gekennzeichnet, daß die Mittel zur Eingabe von Faserstoff zum Stoffauflauf aus einem Rohrleitungs- und Ventilsystem bestehen, über das Faserstoff aus einer beliebigen Stoffbütte einem beliebigen Strömungskanal des Stoffauflaufs zugeführt werden kann.
  3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß das Rohrleitungs- und Ventilsystem so arrangiert ist, daß es eine beliebige Stoffbütte funktionsmäßig mit ein oder mehreren Strömungskanälen verbinden kann.
  4. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, daß das Kanal- und Ventilsystem so arrangiert ist, daß es einen beliebigen Strömungskanal mit ein oder mehreren Stoffbütten funktionsmäßig verbinden kann.
EP90909740A 1990-07-05 1990-07-05 Verfahren und vorrichtung zur herstellung eines mehrlagigen filtermaterials Revoked EP0537140B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90909740T ATE112596T1 (de) 1990-07-05 1990-07-05 Verfahren und vorrichtung zur herstellung eines mehrlagigen filtermaterials.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1990/000176 WO1992001114A1 (en) 1990-07-05 1990-07-05 Method and apparatus for manufacturing multilayer filter material

Publications (2)

Publication Number Publication Date
EP0537140A1 EP0537140A1 (de) 1993-04-21
EP0537140B1 true EP0537140B1 (de) 1994-10-05

Family

ID=8556492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909740A Revoked EP0537140B1 (de) 1990-07-05 1990-07-05 Verfahren und vorrichtung zur herstellung eines mehrlagigen filtermaterials

Country Status (6)

Country Link
EP (1) EP0537140B1 (de)
JP (1) JPH05507127A (de)
KR (1) KR960003187B1 (de)
DE (1) DE69013168T2 (de)
FI (1) FI925961A0 (de)
WO (1) WO1992001114A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101458243B (zh) * 2007-12-14 2013-01-09 朱勇强 造纸网污染程度的测试方法
US8357220B2 (en) 2008-11-07 2013-01-22 Hollingsworth & Vose Company Multi-phase filter medium
US8679218B2 (en) 2010-04-27 2014-03-25 Hollingsworth & Vose Company Filter media with a multi-layer structure
US9694306B2 (en) 2013-05-24 2017-07-04 Hollingsworth & Vose Company Filter media including polymer compositions and blends

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012215877B4 (de) * 2012-09-07 2022-01-13 Mahle International Gmbh Filterelement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833465A (en) * 1971-04-27 1974-09-03 Miller Bros Co Ltd Single pulping system for multiple pulp stocks used in paperboard machine
US4021295A (en) * 1975-05-05 1977-05-03 Beloit Corporation Method and apparatus for supplying white water from a single silo in the formation of a multi-ply web
JPS5433281A (en) * 1977-08-19 1979-03-10 Matsushita Electric Ind Co Ltd Film forming method
GB2078812B (en) * 1980-06-21 1984-03-07 St Annes Board Mill Co Ltd Flowboxes for paper machines
JPS61275494A (ja) * 1985-05-23 1986-12-05 東洋濾機製造株式会社 濾過材の製造法

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101458243B (zh) * 2007-12-14 2013-01-09 朱勇强 造纸网污染程度的测试方法
US8357220B2 (en) 2008-11-07 2013-01-22 Hollingsworth & Vose Company Multi-phase filter medium
US8545587B2 (en) 2008-11-07 2013-10-01 Hollingsworth & Vose Company Multi-phase filter medium
US8679218B2 (en) 2010-04-27 2014-03-25 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
US10155187B2 (en) 2010-04-27 2018-12-18 Hollingsworth & Vose Company Filter media with a multi-layer structure
US9694306B2 (en) 2013-05-24 2017-07-04 Hollingsworth & Vose Company Filter media including polymer compositions and blends

Also Published As

Publication number Publication date
KR960003187B1 (ko) 1996-03-06
KR930701662A (ko) 1993-06-12
WO1992001114A1 (en) 1992-01-23
JPH05507127A (ja) 1993-10-14
EP0537140A1 (de) 1993-04-21
FI925961A (fi) 1992-12-31
FI925961A0 (fi) 1992-12-31
DE69013168T2 (de) 1995-02-23
DE69013168D1 (de) 1994-11-10

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