EP2060675A2 - Procédé de formation de feuille et partie humide destinés à la fabrication d'une bande de matière fibreuse - Google Patents

Procédé de formation de feuille et partie humide destinés à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP2060675A2
EP2060675A2 EP08018676A EP08018676A EP2060675A2 EP 2060675 A2 EP2060675 A2 EP 2060675A2 EP 08018676 A EP08018676 A EP 08018676A EP 08018676 A EP08018676 A EP 08018676A EP 2060675 A2 EP2060675 A2 EP 2060675A2
Authority
EP
European Patent Office
Prior art keywords
fluid
wet end
headbox
machine direction
openings
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Withdrawn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
EP08018676A
Other languages
German (de)
English (en)
Other versions
EP2060675A3 (fr
Inventor
Petra Resch
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.)
Andritz AG
Original Assignee
Andritz AG
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 Andritz AG filed Critical Andritz AG
Publication of EP2060675A2 publication Critical patent/EP2060675A2/fr
Publication of EP2060675A3 publication Critical patent/EP2060675A3/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Withdrawn legal-status Critical Current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
    • D21F1/02—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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F1/56—Deckle frame arrangements
    • 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 subject of this invention is a sheet forming process for producing a fibrous web in a paper or board machine with improved fiber orientation, as well as a corresponding wet end for performing the sheet forming process.
  • a pulp suspension is applied to a sieve with the aid of a headbox.
  • the headbox consists of a distribution device for distributing the pulp suspension over the machine width, from a turbulence block, which is formed by a plurality of turbulence tubes and from a headbox.
  • a turbulence block which is formed by a plurality of turbulence tubes and from a headbox.
  • the pulp suspension jet impinge on the wire as evenly as possible over the entire width of the machine.
  • the jet from the headbox expands after exiting the headbox nozzle, and there is an additional expansion of the jet after the impingement of the free jet on the wire.
  • a Siebrandbegrenzung is necessary to guide the free jet and the pulp suspension on the screen therefore a Siebrandbegrenzung is necessary. Without the Siebrandbegrenzung the suspension would flow off the side of the screen, which would lead to a reduction of the basis weight and a disturbance of the fiber orientation in the edge region.
  • the Siebrandbegrenzung causes but also undesirable effects.
  • the edge friction between the lateral headbox nozzle wall or the screen edge boundary and the pulp suspension leads to fiber orientation disturbances or to the formation of an uneven velocity profile in the suspension, wherein the speed in the machine direction is greater in the center of the screen than in the edge areas.
  • the Siebrandbegrenzung causes a reflection wave to Siebmitte out when the suspension impinges on the Siebrandbegrenzung. This undesirable effect is reduced by screen edge limitations that expand in the machine direction.
  • the pulp suspension flows into the areas exposed by the expansion, forming a pulp mat with a thinner edge.
  • the invention is therefore based on the object to provide an improved sheet forming method and a suitable wet end of a paper or board machine that circumvents the above-mentioned disadvantages and thereby reduces Faserorient istsin and leads to the formation of a pulp mat with improved basis weight distribution over the entire machine width.
  • a pulp suspension is used as the fluid, which may also have a lower or higher consistency than the pulp suspension fed to the headbox distributor.
  • This additional pulp feed makes it easier to compensate for the differences in basis weight across the machine direction. In a Siebrandbegrenzung widening in the machine direction is filled by this additional pulp feed the gap formed by the expansion with pulp suspension, thus achieving a uniform suspension height on the wire. This favors a uniform basis weight distribution over the entire fibrous web width.
  • a gas in particular air can be used.
  • the fluid is supplied essentially in the machine direction, since this favors the formation of a fluid film between Siebrandbegrenzung and pulp suspension. It is advantageous if the fluid when viewed in the machine direction as viewed has a greater flow velocity, as the pulp suspension. It can be supplied to the fluid in the machine direction at several successively arranged locations, while the fluid in the individual points with different flow rates or quantities be supplied. Preferably, the amount or flow rate of the fluid in the individual points in the machine direction then increases, since the pulp suspension thickened by the dewatering process on the wire and thus increases the cost of Randreibungskompensation.
  • the invention also provides a wet end for sheet formation, in which after a turbulence block in the screen edge boundary and / or the headbox feed channels are provided with openings for supplying a fluid to the pulp suspension.
  • the fluid emerging from the openings reduces edge friction and improves sheet formation.
  • the openings may be arranged either in a side wall of the headbox or in a side wall of the Siebrandbegrenzung.
  • a fluid supply in the headbox has the advantage that existing Siebrandbegrenzonne need not be modified, whereas a supply via the Siebrandbegrenzung allows improved edge friction minimization to the fixation of the sheet.
  • the supply channels open into the side wall substantially parallel to the machine direction. This has the advantage that the flow direction of the fluid has substantially in the machine direction.
  • the openings are provided for supplying fluid on both sides of the wet end, as this minimizes the edge friction on both sides and a symmetrical basis weight profile is formed.
  • the side wall after the opening has at least one recess which decreases in cross-section in the machine direction, wherein the side wall in the region of the recess serves as a guide surface for the supplied fluid.
  • the fluid is approximately in the machine direction of the pulp suspension fed and favors the formation of a friction-reducing fluid film.
  • a plurality of outlet openings are provided, preferably in the machine direction seen one behind the other.
  • the arrangement shown comprises a headbox 1 comprising a distributor 2, a turbulence block 3, which consists of a plurality of turbulence tubes 4 and a following headbox nozzle 5, through which the pulp suspension fed through the distributor 2 exits onto a sieve 6.
  • the machine direction is indicated by an arrow 15.
  • At Siebrand is a Siebrandbegrenzung 7, which prevents the impinging on the sieve 6 pulp suspension flows laterally from the wire 6.
  • openings 9 of supply channels 10. Through these supply channels 10, a fluid, for example water, dilution water, pulp suspension, air or a mixture of these components is supplied.
  • the edge friction between the pulp suspension and the side wall 8 of the Siebrandbegrenzung 7 decreases because the fluid forms a boundary film between the suspension and the side wall 8.
  • the fluid is injected substantially in the machine direction, wherein the flow rate of the fluid is greater than the flow rate of the pulp suspension on the screen.
  • the openings 9 in the side wall 8 of the Siebrandbegrenzung 7 are located in recesses 11. Through these recesses 11, the fluid is injected as parallel as possible in the machine direction between the side wall 8 of the Siebrandbegrenzung 7 and emerging from the headbox 1 pulp suspension.
  • FIG. 2 represents a further embodiment of the invention, wherein the reference numerals used to those in Fig. 1 correspond.
  • the fluid is supplied via supply channels 10 'through openings 9' in the side wall 8 'of the headbox nozzle 5.
  • the openings 9 ' are arranged in recesses 11' of the side wall 8 ', thereby promoting the fluid supply in the machine direction.
  • FIG. 3 shows a side view of FIG. 1 , it is particularly well recognized the sieve 6, which is deflected under the headbox 1 by a breast roll 12.
  • the pulp suspension emerging from the headbox nozzle 5 impinges on the wire 6 in the jet impact point 13.
  • the opening 9 and the recess 11 in the side wall 8 of the Siebrandbegrenzung 7 are indicated.
  • FIG. 4 is a perspective detail view of FIG. 1 illustrated and illustrates the shape of the recess 11 in the side wall 8.
  • the pulp suspension exits from the nozzle opening 14 of the headbox 5 and strikes in Strahlauf Economicsticiansville 13 on the sieve 6.
  • the fluid exits from the opening 9.
  • the opening 9 is arranged perpendicular to the machine direction in the recess 11 of the side wall 8 and formed as a slot.
  • the recess 11 decreases continuously in cross section in the machine direction.
  • a pulp suspension is fed to the headbox 1 via the distributor 2. In this case, a part of the suspension in a return 2 'are deducted.
  • the pulp suspension flows in the headbox 1 through a plurality of turbulence tubes 4 in the headbox 5. From the pulp nozzle 5, the pulp suspension hits in the Strahlauf Economicsticiantician No 13 on the sieve 6.
  • By supply channels 10, 10 'in the Siebrandbegrenzung 7 and headbox 5 is a fluid for Influenced influencing the velocity profile of the pulp suspension.
  • the fluid preferably has a higher flow velocity in the machine direction than the pulp suspension, and optionally a lower viscosity and lower consistency than the pulp suspension. Due to the higher flow velocity of the fluid, the pulp suspension is accelerated in the edge regions in the machine direction. As a result, a uniform velocity profile is formed over the entire width of the pulp suspension.
  • the embodiments shown in the drawings represent only a preferred embodiment of the invention.
  • the invention also includes other embodiments, e.g. the injection of a fluid over the side wall 8 'of the headbox nozzle 5 and the side wall 8 of the Siebrandbegrenzung 7.
  • the fluid can be supplied at different speeds or different amounts through the respective openings. It is advantageous if the speed of the fluid supplied through the individual openings 9, 9 'increases in the machine direction, since the pulp suspension thickened by the dewatering process on the wire 6 and thus the effort for edge friction compensation increases.

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  • Paper (AREA)
EP08018676A 2007-11-19 2008-10-24 Procédé de formation de feuille et partie humide destinés à la fabrication d'une bande de matière fibreuse Withdrawn EP2060675A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT0186907A AT505931B8 (de) 2007-11-19 2007-11-19 Blattbildungsverfahren und nasspartie zur herstellung einer faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2060675A2 true EP2060675A2 (fr) 2009-05-20
EP2060675A3 EP2060675A3 (fr) 2009-10-07

Family

ID=40377885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08018676A Withdrawn EP2060675A3 (fr) 2007-11-19 2008-10-24 Procédé de formation de feuille et partie humide destinés à la fabrication d'une bande de matière fibreuse

Country Status (4)

Country Link
US (1) US20090139673A1 (fr)
EP (1) EP2060675A3 (fr)
JP (1) JP2009127186A (fr)
AT (1) AT505931B8 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102071588A (zh) * 2010-11-11 2011-05-25 华南理工大学 流浆箱的互补式布浆器
EP2524083A1 (fr) * 2010-01-15 2012-11-21 Metso Paper, Inc. Dispositif pour une section de formation de film d'une machine de film de fibres
CN103046418A (zh) * 2012-12-20 2013-04-17 华南理工大学 一种新月型双层流浆箱

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101695542B1 (ko) * 2015-04-28 2017-01-11 추경연 제지 장치용 에지 세이버
US10513825B2 (en) 2017-09-18 2019-12-24 Ahmed Ibrahim Paper manufacturing system
CN110016830B (zh) * 2019-04-16 2023-06-20 华南理工大学 一种斜网成型器用的非接触式密封装置及方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857816B1 (fr) 1997-01-14 2002-04-03 Metso Paper, Inc. Caisse de tête d'une machine à papier avec alimentation en eau blanche par les côtes latéraux
EP1619298A2 (fr) 2004-07-21 2006-01-25 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse, en particulier une bande de papier ou de carton

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3715551A1 (de) * 1987-05-09 1988-12-01 Voith Gmbh J M Verfahren zum verringern des flatterns der bahnraender einer papierbahn sowie papiermaschine zum durchfuehren des verfahrens
JPH03249297A (ja) * 1990-02-26 1991-11-07 Mitsubishi Heavy Ind Ltd 抄紙機ヘッドボックスの流向調整方法
US5045154A (en) * 1990-06-28 1991-09-03 Baluha Mark R Conveyor edge product containing device for paper making machinery
FI115473B (fi) * 2004-03-25 2005-05-13 Process Flow Ltd Oy Laite ja menetelmä paperikoneessa sekä paperikone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857816B1 (fr) 1997-01-14 2002-04-03 Metso Paper, Inc. Caisse de tête d'une machine à papier avec alimentation en eau blanche par les côtes latéraux
EP1619298A2 (fr) 2004-07-21 2006-01-25 Voith Paper Patent GmbH Caisse de tête d'une machine pour fabriquer une bande fibreuse, en particulier une bande de papier ou de carton

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2524083A1 (fr) * 2010-01-15 2012-11-21 Metso Paper, Inc. Dispositif pour une section de formation de film d'une machine de film de fibres
EP2524083A4 (fr) * 2010-01-15 2013-05-29 Metso Paper Inc Dispositif pour une section de formation de film d'une machine de film de fibres
CN102071588A (zh) * 2010-11-11 2011-05-25 华南理工大学 流浆箱的互补式布浆器
CN103046418A (zh) * 2012-12-20 2013-04-17 华南理工大学 一种新月型双层流浆箱

Also Published As

Publication number Publication date
JP2009127186A (ja) 2009-06-11
AT505931B1 (de) 2009-05-15
AT505931A4 (de) 2009-05-15
EP2060675A3 (fr) 2009-10-07
US20090139673A1 (en) 2009-06-04
AT505931B8 (de) 2009-06-15

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