EP1884591A1 - Procédé destiné à l'introduction d'une suspension fibreuse dans une caisse de tête - Google Patents

Procédé destiné à l'introduction d'une suspension fibreuse dans une caisse de tête Download PDF

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Publication number
EP1884591A1
EP1884591A1 EP07013179A EP07013179A EP1884591A1 EP 1884591 A1 EP1884591 A1 EP 1884591A1 EP 07013179 A EP07013179 A EP 07013179A EP 07013179 A EP07013179 A EP 07013179A EP 1884591 A1 EP1884591 A1 EP 1884591A1
Authority
EP
European Patent Office
Prior art keywords
headbox
pulp suspension
paper
operated
pressure
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.)
Withdrawn
Application number
EP07013179A
Other languages
German (de)
English (en)
Inventor
Erwin Binder
Axel Gommel
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1884591A1 publication Critical patent/EP1884591A1/fr
Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/22—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in apparatus with a vertical axis
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • 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
    • D21F1/06—Regulating pulp flow
    • D21F1/065—Shock-absorbing devices

Definitions

  • the invention relates to a method for feeding a pulp suspension according to the preamble of claim 1.
  • the pulp suspension to be supplied receives most of the fibers from a thick stock suspension provided in the stock preparation plant.
  • the latter has e.g. a typical consistency, i. a dry content between 2.5 and 5%.
  • dilution liquid e.g. White water of the paper machine
  • the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine. This can e.g. 1 to 2%.
  • the fibrous suspension so formed, after most or all of the ingredients are contained in the correct amount, is conveyed via the headbox pump to the head box of a paper or board machine. Between this headbox pump and the headbox is a closed system, which is under pressure, so that the pulp suspension can get to the or the screens of the paper machine.
  • Modern headboxes have a considerable pressure drop because of their hydraulic functions, which is why the inlet space of the headbox is under high pressure. This required pressure drop further increases when the paper or board machine is a so-called high-speed machine, ie, for example, produced at speeds above 1500 m / min. Because of this high pressure and the aforementioned pressure sorter must be designed for such pressures, which is possible, but has led to considerable effort.
  • a corresponding system example shows the DE 100 50 109 A1 ,
  • the invention is based on the object to provide a method of the type mentioned above, with which the pressure load of the directly before the headbox Drucksortierers can be reduced.
  • the invention makes it possible to combine the requirement for optimum safety with the possibility of further increasing the pressures in the headbox in order to be able to drive higher paper machine speeds. But even with not increased paper machine speed, the invention may be advantageous because the demands on the pressure sorters, such as strength of the housing, the seals and the sorting baskets are lower, which in turn has economic advantages.
  • FIG. 1 shows an example for carrying out the method according to the invention.
  • a pulp suspension S is produced in the usual manner by mixing a thick stock suspension 4 with a diluting liquid 5 and then has in Essentially the desired consistency for the operation of the headbox 1 of the paper or board machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%.
  • the dilution liquid 5, which is supplied at a mixing point 8 originates in the example shown here from the first white water 12, that is, the water incurred in the forming area of the paper or board machine 2. It is often referred to as "white water I" (SWI), unlike the later on the paper machine resulting second white water 16 (SWII), which contains much less fines.
  • SWI white water I
  • the white water is collected below the paper machine sieve and discharged laterally. In the open channels used for this purpose, a large part of the air contained can already escape. Nevertheless, it often makes sense to eliminate a further gas portion 7 in a special container 11, as he eg from the DE 199 38 799 is known. To assist the container 11 may be under a moderate negative pressure.
  • a degassing device 6 is used here. This is constructed as a cylindrical or conical container and provided according to the invention with a rotor 13.
  • the pulp suspension S enters the substantially cylindrical inner space 14 of the rotor 13 and is set in rapid rotation. This principle corresponds to that of a solid bowl centrifuge.
  • the contained gases 7 migrate inwardly as a result of the centrifugal forces and are sucked out of the center by a vacuum device 10 (only roughly indicated).
  • a phase boundary forms liquid / gaseous in the container.
  • the centrifugal forces can be at least 5 times, preferably 10 times the gravitational acceleration.
  • the vacuum device 10 does not require a negative pressure which corresponds to the vapor pressure of the suspension or is in the vicinity thereof. Conventional values for the negative pressure of a vacuum device 10 used here are 0.8 to 0.9 bar. As will be shown later, this rotor-driven degassing device 6 can also be omitted.
  • the suspension is sucked with a fuel pump 9 and here in a closed system (ie without open containers or laid paper) up to the headbox 1 out.
  • a closed system ie without open containers or laid paper
  • Foreign matter through a cleaner 17 excreted.
  • the effort that needs to be done for these hydrocyclones will depend on the raw materials as well as the quality requirements of the paper produced. If, for example, the thick matter suspension 4 was formed from waste paper, there may still be sand and small plastic parts.
  • the cleaner system 17 will operate with a consistency (solids content of the suspension) that is higher than that in the headbox 1, which saves eg investment and energy costs.
  • the diluting liquid 25 can then be admixed with the accepts of the cleaner system 17 via a mixing device 26.
  • a headbox pump 3 For the acceptance of the cleaner 17 a headbox pump 3 is installed to increase the pressure, the pressure build-up is large enough so that the headbox 1 a paper machine 2 can be operated properly.
  • the accepts the cleaner 17 enters a sorting system 18, which is one or more pressure graders, which are connected upstream of the headbox pump 3. As a result, the high pressures required for the headbox do not occur in the sorting unit 18, so do not load the pressure graders. Similar considerations as in the consistency of the cleaner 17 can also be made in the sorting system 18. Then their accepts would be mixed with a dilution liquid 27 via a mixing device 28.
  • the paper production on the paper machine 2 is caused by pressure pulsations, e.g. can be derived from the headbox pump 3 or the system in front, is impaired, it can be provided in the closed system in front of the headbox 1, a pulsation damper 15, which, for. degrades the disturbing pulsations by a plurality of hydraulically effective throttle bodies in a conventional manner.
  • a pulsation damper 15 which, for. degrades the disturbing pulsations by a plurality of hydraulically effective throttle bodies in a conventional manner.
  • the sorting system is preferably equipped with one or more pressure graders, which are equipped with at least one fixed rotationally symmetrical, in particular cylindrical screen basket 20 and a rotating scraper 21 moved past it.
  • the suspension is supplied through the inlet 22.
  • the accepts the sieve openings of the Strainer basket 20 has passed, leaves the housing of the pressure sorter 19 through the Gutstoffauslass 23 and the reject rejected by the Rejektauslass 24.
  • the pressure sorter 19 also has in the center of a degassing 25, which derive the accumulated in the center by the rotational flow of the suspension gases / air or aspirate. Precisely because the pressure in the pressure sorter is significantly lower than usual, better venting in conjunction with the invention is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP07013179A 2006-08-02 2007-07-05 Procédé destiné à l'introduction d'une suspension fibreuse dans une caisse de tête Withdrawn EP1884591A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610035956 DE102006035956B3 (de) 2006-08-02 2006-08-02 Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf

Publications (1)

Publication Number Publication Date
EP1884591A1 true EP1884591A1 (fr) 2008-02-06

Family

ID=38289089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07013179A Withdrawn EP1884591A1 (fr) 2006-08-02 2007-07-05 Procédé destiné à l'introduction d'une suspension fibreuse dans une caisse de tête

Country Status (2)

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EP (1) EP1884591A1 (fr)
DE (1) DE102006035956B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102421962A (zh) * 2009-05-12 2012-04-18 沃依特专利有限责任公司 上浆流送系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013210004A1 (de) * 2013-05-29 2014-05-15 Voith Patent Gmbh Konstantteil
AT15159U1 (de) * 2014-11-24 2017-01-15 Voith Patent Gmbh Konstantteil-Sortierung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2635360A1 (de) * 1976-07-20 1978-01-26 Escher Wyss Gmbh Daempfungsvorrichtung fuer eine fluessigkeitsstroemung
WO1983002293A1 (fr) * 1981-12-30 1983-07-07 Nils Anders Lennart Wikdahl Procede et installation de desaeration de suspensions de fibres
US5707488A (en) * 1994-10-20 1998-01-13 International Paper Company Screen/vortex apparatus for cleaning recycled pulp related process
WO2003093574A1 (fr) * 2002-05-02 2003-11-13 Metso Paper, Inc. Arrangement de procede dans la circulation courte d'une machine a papier
WO2003104548A1 (fr) * 2002-06-11 2003-12-18 Metso Paper, Inc. Appareil de fractionnement et procede de fractionnement de composition de fabrication dans une machine a papier ou analogue
DE10337944A1 (de) * 2003-08-19 2005-03-17 Voith Paper Patent Gmbh Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938799A1 (de) * 1999-08-16 2001-02-22 Voith Sulzer Papiertech Patent Verfahren zum Führen und Entlüften von an einer Papiermaschine anfallendem Siebwasser
DE10050109A1 (de) * 2000-10-09 2002-04-11 Voith Paper Patent Gmbh Verfahren und Mischvorrichtung zur Erzeugung einer fertigen Faserstoffsuspension

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2635360A1 (de) * 1976-07-20 1978-01-26 Escher Wyss Gmbh Daempfungsvorrichtung fuer eine fluessigkeitsstroemung
WO1983002293A1 (fr) * 1981-12-30 1983-07-07 Nils Anders Lennart Wikdahl Procede et installation de desaeration de suspensions de fibres
US5707488A (en) * 1994-10-20 1998-01-13 International Paper Company Screen/vortex apparatus for cleaning recycled pulp related process
WO2003093574A1 (fr) * 2002-05-02 2003-11-13 Metso Paper, Inc. Arrangement de procede dans la circulation courte d'une machine a papier
WO2003104548A1 (fr) * 2002-06-11 2003-12-18 Metso Paper, Inc. Appareil de fractionnement et procede de fractionnement de composition de fabrication dans une machine a papier ou analogue
DE10337944A1 (de) * 2003-08-19 2005-03-17 Voith Paper Patent Gmbh Verfahren zur Zuführung einer Faserstoffsuspension zu einem Stoffauflauf

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102421962A (zh) * 2009-05-12 2012-04-18 沃依特专利有限责任公司 上浆流送系统

Also Published As

Publication number Publication date
DE102006035956B3 (de) 2007-08-23

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