EP0600251B1 - Process for uniforming the composition of a paper web - Google Patents

Process for uniforming the composition of a paper web Download PDF

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Publication number
EP0600251B1
EP0600251B1 EP93117847A EP93117847A EP0600251B1 EP 0600251 B1 EP0600251 B1 EP 0600251B1 EP 93117847 A EP93117847 A EP 93117847A EP 93117847 A EP93117847 A EP 93117847A EP 0600251 B1 EP0600251 B1 EP 0600251B1
Authority
EP
European Patent Office
Prior art keywords
web
wires
retention
paper web
paper
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.)
Expired - Lifetime
Application number
EP93117847A
Other languages
German (de)
French (fr)
Other versions
EP0600251A1 (en
Inventor
Ulrich Begemann
Helmut Heinzmann
Wolfgang Ruf
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0600251A1 publication Critical patent/EP0600251A1/en
Application granted granted Critical
Publication of EP0600251B1 publication Critical patent/EP0600251B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/06—Regulating pulp flow
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y10S162/11—Wet end paper making variables

Definitions

  • the invention relates to a method for producing a paper web with a headbox according to the preamble of claim 1.
  • Such a headbox should set the stock density and fiber orientation cross profile of the paper stock suspension at the latest before the outlet gap in such a way that the basis weight and fiber orientation cross profile of the paper web corresponds to the desired requirements over the entire width, which generally means that it is constant and at the same time ensures a uniform paper composition.
  • the paper composition is the concentration of the individual components, e.g. Long fibers, short fibers, fillers etc. are meant.
  • DE 35 14 554 proposes to change the consistency locally, i.e. adjust the fabric density at certain points as required. However, it remains open how this should be done.
  • DE 40 19 593 A1 recommends the following procedure: If the basis weight profile of the paper web deviates at a certain point in the web width, the concentration C M of the section stream in question, and thus the stream emerging from the mixer in question, should be changed accordingly. To achieve this, the ratio of the amounts of the control currents Q H / Q L fed to the mixer is changed. With valves of the usual design, however, it is difficult to avoid that the section flow Q M leaving the mixer is also uncontrolled by the setpoint and deviates unintentionally. It is also known from DE-OS 35 38 466 that a change in the volume flow of a section leads to an influence on the fiber orientation angle in the outlet area of the headbox. If the amount of a section stream deviates in an uncontrolled manner from a target value, the fiber orientation also changes in an uncontrolled manner.
  • the invention has for its object to influence the composition cross profile of the fibrous web of a paper machine so that it comes as close as possible to the ideal profile.
  • the composition cross profile can be influenced in a direction that is favorable for production.
  • this non-uniform basis weight cross profile is influenced by aperture deformation or by sectional material density changes with the intention of obtaining an ideal basis weight cross profile.
  • the process can be applied to all headbox types (e.g. single-layer headboxes, multi-layer or multi-layer headboxes, headboxes for gap formers, headboxes for Fourdrinier screens, etc.).
  • headbox types e.g. single-layer headboxes, multi-layer or multi-layer headboxes, headboxes for gap formers, headboxes for Fourdrinier screens, etc.

Abstract

A method of manufacturing a web of fibers, especially a web of paper. The pulp is uniformly distributed through an outlet over the width of the machine and along a wire or between two wires. Most of the moisture is subsequently extracted from the pulp accommodated on or between the wires at a draining point. Various amounts of retaining agents are added to the pulp at sections across the headbox and the web in order to control the level of retention sectionally.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Papierbahn mit einem Stoffauflauf gemäß dem Oberbegriff von Anspruch 1.The invention relates to a method for producing a paper web with a headbox according to the preamble of claim 1.

Ein solcher Stoffauflauf soll das Stoffdichte- und Faserorientierungsquerprofil der Papierstoffsuspension spätestens vor dem Auslaufspalt derart einstellen, daß das Flächengewichts- und Faserorientierungsquerprofil der Papierbahn über die gesamte Breite den gewünschten Anforderungen entspricht, das bedeutet in der Regel konstant ist und gleichzeitig für eine gleichmäßige Papierzusammensetzung sorgen. Unter Papierzusammensetzung ist die Konzentration der einzelnen Bestandteile wie z.B. Langfasern, Kurzfasern, Füllstoffe usw. gemeint.Such a headbox should set the stock density and fiber orientation cross profile of the paper stock suspension at the latest before the outlet gap in such a way that the basis weight and fiber orientation cross profile of the paper web corresponds to the desired requirements over the entire width, which generally means that it is constant and at the same time ensures a uniform paper composition. The paper composition is the concentration of the individual components, e.g. Long fibers, short fibers, fillers etc. are meant.

Es ist folgender Stand der Technik zur Beeinflussung des Querprofils einer Papierbahn bekannt geworden:The following prior art for influencing the transverse profile of a paper web has become known:

DE 35 14 554 schlägt vor, die Stoffdichte örtlich zu verändern, d.h. je nach Bedarf an bestimmten Stellen die Stoffdichte anzupassen. Dabei bleibt jedoch offen, auf welche Art und Weise dies vorgenommen werden soll.DE 35 14 554 proposes to change the consistency locally, i.e. adjust the fabric density at certain points as required. However, it remains open how this should be done.

DE 40 19 593 A1 empfiehlt folgendes Vorgehen: Bei Abweichen des Flächengewichtsprofils der Papierbahn an einer bestimmten Stelle der Bahnbreite soll die Konzentration CM des betreffenden Sektionsstromes, und damit des aus dem betreffenden Mischer austretenden Stromes entsprechend geändert werden. Um dies zu erreichen, wird das Verhältnis der Mengen der dem Mischer zugeführten Regelstrome QH/QL verändert. Bei Ventilen der üblichen Bauart läßt es sich jedoch nur schwer vermeiden, daß auch der den Mischer verlassende Sektionsstrom QM vom Sollwert unkontrolliert und ungewollt abweicht. Es ist außerdem aus DE-OS 35 38 466 bekannt, daß eine Veränderung des Volumenstromes einer Sektion zu einer Beeinflussung des Faserorientierungswinkels im Auslaufbereich des Stoffauflaufes führt. Weicht die Menge eines Sektionsstromes in unkontrollierter Weise von einem Sollwert ab, so ändert sich damit auch die Faserorientierung in unkontrollierter Weise.DE 40 19 593 A1 recommends the following procedure: If the basis weight profile of the paper web deviates at a certain point in the web width, the concentration C M of the section stream in question, and thus the stream emerging from the mixer in question, should be changed accordingly. To achieve this, the ratio of the amounts of the control currents Q H / Q L fed to the mixer is changed. With valves of the usual design, however, it is difficult to avoid that the section flow Q M leaving the mixer is also uncontrolled by the setpoint and deviates unintentionally. It is also known from DE-OS 35 38 466 that a change in the volume flow of a section leads to an influence on the fiber orientation angle in the outlet area of the headbox. If the amount of a section stream deviates in an uncontrolled manner from a target value, the fiber orientation also changes in an uncontrolled manner.

Es ist ferner z.B. aus DE-PS 29 42 966 oder DE-OS 35 35 849 bekannt, die Weite des Auslaufspaltes zu verändern, beispielsweise durch Gewindespindeln zum Verschwenken oder Verbiegen der Oberlippe. Hierdurch kann der Durchsatz der Suspension örtlich verändert werden. Gleichzeitig wird jedoch auch die Strömungsrichtung örtlich beeinflußt, und damit auch die Faserorientierung. Durch eine örtliche Spaltverengung wird nämlich den Fasern an den Engstellen eine andere Strömungsrichtung erteilt, als an anderen Stellen des Auslaufspaltes. Dies bedeutet, daß zwar das Flächengewicht durch diese sogenannte Verdrängunsregelung über die Breite des Stoffauflaufes gleichmäßig gemacht werden kann, daß jedoch die an sich gute Faserorientierung wieder zerstört wird.It is also e.g. known from DE-PS 29 42 966 or DE-OS 35 35 849 to change the width of the outlet gap, for example by means of threaded spindles for pivoting or bending the upper lip. As a result, the throughput of the suspension can be changed locally. At the same time, however, the flow direction is also influenced locally, and with it the fiber orientation. Because of the local narrowing of the gap, the fibers are given a different flow direction at the narrow points than at other points in the outlet gap. This means that the basis weight can be made uniform over the width of the headbox by this so-called displacement control, but that the good fiber orientation is destroyed again.

Der Erfindung liegt die Aufgabe zugrunde, das Zusammensetzungsquerprofil der Faserbahn einer Papiermaschine so zu beeinflußen, daß es dem Idealprofil möglichst nahe kommt.The invention has for its object to influence the composition cross profile of the fibrous web of a paper machine so that it comes as close as possible to the ideal profile.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Verfahrensanspruches gelöst.This object is achieved by the characterizing features of the method claim.

Die Erfinder haben erkannt, daß unterschiedliche Retention ein ungleichmäßiges Flächengewichtsquerprofil der Faserbahn einer Papiermaschine bewirkt, des weiteren kann durch Zugabe einer Flüssigkeit mit gegenüber dem Hauptstrom abweichender Beschaffenheit, z.B. Stoff mit hohem Langfaseranteil im Randbereich der Papierbahn oder mit hohem Ascheanteil das Zusammensetzungsquerprofil in einer für die Produktion günstigen Richtung beeinflußt werden. Dem Stande der Technik entsprechend wird dieses ungleichmäßige Flächengewichtsquerprofil durch Blendenverformung oder durch sektionale Stoffdichteänderungen beeinflußt mit der Absicht ein möglichst ideales Flächengewichtsquerprofil zu erhalten. Bei der nachfolgenden Entwässerung kommt es jedoch dazu, daß in Abhängigkeit von der Retention durch die Maschen des Siebes bevorzugt kurze Fasern und Asche mit dem Siebwasser hindurchfallen, d.h., daß auch bei erfolgreicher Flächengewichtsquerprofilkorrektur ein nicht ideales, weil nicht gleichmäßiges Papierzusammensetzungsquerprofil entsteht. Es wird daher vorgeschlagen, die Retention durch sektionale Zugabe eines Retentionsmittels in ihren Abweichungen zum Mittelwert zu begrenzen, um an den Stellen extremer Retentionsabweichungen die Papiereigenschaften nicht so stark zu verändern.The inventors have recognized that different retention causes an uneven basis weight cross profile of the fibrous web of a paper machine, furthermore by adding a liquid to the main stream deviating properties, e.g. fabric with a high proportion of long fibers in the edge area of the paper web or with a high proportion of ash, the composition cross profile can be influenced in a direction that is favorable for production. In accordance with the state of the art, this non-uniform basis weight cross profile is influenced by aperture deformation or by sectional material density changes with the intention of obtaining an ideal basis weight cross profile. In the subsequent dewatering, however, depending on the retention, short fibers and ashes preferably fall through the mesh of the sieve with the white water, that is to say that even when the basis weight cross profile correction is successful, a non-ideal, because non-uniform, paper composition cross profile arises. It is therefore proposed to limit the retention of retention by sectional addition of a retention agent to the mean value in order not to change the paper properties so much at the points of extreme retention variations.

Das Verfahren läßt sich auf alle Stoffauflauf-Typen (z.B. Einlagenstoffaufläufe, Mehrlagen- bzw. Mehrschichten-Stoffaufläufe, Stoffaufläufe für Spaltformer, Stoffaufläufe für Langsiebe, etc.) anwenden.The process can be applied to all headbox types (e.g. single-layer headboxes, multi-layer or multi-layer headboxes, headboxes for gap formers, headboxes for Fourdrinier screens, etc.).

Claims (1)

  1. Method for the manifacture of a fiber web, particulary of a paper web, comprising the following steps:
    1.1 The fiber suspension is uniformly distributed over the width of the machine onto a wire respectively between two wires;
    1.2 The main portion of the water is drained from the fiber suspension laid onto the wire respectively between the wires;
    characterized by the following step:
    1.3 A sectionally different amount of retention agents is added to the fiber suspension in order to sectionally controll the degree of retention.
EP93117847A 1992-11-05 1993-11-04 Process for uniforming the composition of a paper web Expired - Lifetime EP0600251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4237309A DE4237309A1 (en) 1992-11-05 1992-11-05
DE4237309 1992-11-05

Publications (2)

Publication Number Publication Date
EP0600251A1 EP0600251A1 (en) 1994-06-08
EP0600251B1 true EP0600251B1 (en) 1996-06-12

Family

ID=6472130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117847A Expired - Lifetime EP0600251B1 (en) 1992-11-05 1993-11-04 Process for uniforming the composition of a paper web

Country Status (7)

Country Link
US (1) US5401363A (en)
EP (1) EP0600251B1 (en)
JP (1) JP3494305B2 (en)
AT (1) ATE139278T1 (en)
CA (1) CA2102567A1 (en)
DE (2) DE4237309A1 (en)
FI (1) FI113479B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054634A1 (en) 2008-12-15 2010-06-17 Voith Patent Gmbh Forming unit i.e. high-consistent sheet forming unit, for manufacturing graphical paper, has application unit opposite to support surface, where ratio between distance of edge of guiding surface and arc length amounts to specific value

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4237309A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M
DE4316054C2 (en) * 1993-05-13 1995-11-23 Voith Gmbh J M Headbox of a paper machine
FI92729C (en) * 1993-10-29 1994-12-27 Valmet Paper Machinery Inc Multilayer headbox pulp feed system and method in multilayer headbox operation
DE19509522C2 (en) * 1995-03-20 1999-03-11 Voith Sulzer Papiermasch Gmbh Wet section of a paper machine
US6210535B1 (en) * 1995-06-01 2001-04-03 Valmet Corporation Stock feed system for a multi-layer headbox and method in the operation of a multi-layer headbox
US5603806A (en) * 1995-06-01 1997-02-18 Valmet Corporation Method and apparatus for lateral alignment of the cross-direction quality profile of a web in a paper machine
DE19627669C2 (en) * 1996-07-10 2001-03-01 Stora Enso Publication Paper A Process for improving printing paper
FI110704B (en) * 1996-10-18 2003-03-14 Metso Paper Inc Multilayer Headbox Mass Feeding System and Method for Multilayer Headboard Operation
US6113741A (en) * 1996-12-06 2000-09-05 Eka Chemicals Ab Process for the production of paper
US6099689A (en) * 1998-02-17 2000-08-08 Nalco Chemical Company Production of paper and board products with improved retention, drainage and formation
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
DE19843727A1 (en) 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Process and headbox system to improve the consistency cross profile of a fiber web
DE19843729A1 (en) * 1998-09-24 2000-03-30 Voith Sulzer Papiertech Patent Control of the lateral shrinkage profile of a running paper or cardboard web uses on-line mapping to set the composition of the fiber suspension flows by sections at the stock inlet across the machine width
FI112961B (en) * 1998-11-26 2004-02-13 Metso Paper Inc Method and apparatus for measuring retention profile and controlling retention in a paper machine / cardboard machine
DE19906062A1 (en) * 1999-02-12 2000-08-17 Voith Sulzer Papiertech Patent Method and device for producing a material web
DE19922817A1 (en) * 1999-05-19 2000-11-23 Voith Sulzer Papiertech Patent Device and method for controlling or regulating the basis weight of a paper or cardboard web
US6270625B1 (en) * 1999-06-29 2001-08-07 The Mead Corporation Method for manufacturing colored stripped paper
DE10021979A1 (en) 2000-05-05 2001-11-08 Voith Paper Patent Gmbh Method and device for forming a multilayer and / or multilayer fibrous web
DE10117236A1 (en) * 2001-04-06 2002-10-17 Voith Paper Patent Gmbh Paper making process uses never-dried-pulp with additive introduced by chemical precipitation
ZA200508659B (en) * 2003-05-09 2007-03-28 Akzo Nobel Nv A process for the production of paper
JP2007512102A (en) 2003-11-20 2007-05-17 ザ ヘンリー エム． ジャクソン ファウンデーション フォー ザ アドヴァンスメント オブ ミリタリー メディシン， インク． Portable manual pump for fluid suction
US8337475B2 (en) 2004-10-12 2012-12-25 C. R. Bard, Inc. Corporeal drainage system
DE102008041954A1 (en) 2008-09-10 2010-03-11 Voith Patent Gmbh Method for producing fiber- or nonwoven fabric web, particularly paper, cardboard or tissue web, involves carrying out surface weight cross profiling by appropriate section-by-section influence
DE102009001731A1 (en) 2009-03-23 2010-09-30 Voith Patent Gmbh Method for adjusting a basis weight cross-section of a fibrous or nonwoven web and machine for producing a fibrous or nonwoven web
DE102009045916A1 (en) 2009-10-22 2011-04-28 Voith Patent Gmbh Device useful for sectional dosing of fluid medium into further fluid medium deployable over dispensing region extending in transverse direction, comprises device for transverse distribution, dosing device, and device for mixing
DE102010029556A1 (en) 2010-06-01 2011-12-01 Voith Patent Gmbh Wet end for e.g. paperboard web, has shoe pressing device located upstream of couching press roll and backing roll, where press roll forming press nip is felted in web running direction
CN111819324B (en) 2018-01-05 2023-05-12 国际纸业公司 Paper product with increased bending stiffness and transverse strength and method of making same

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693415A (en) * 1951-04-10 1954-11-02 Ecusta Paper Corp Method of adding extra filler to the edges of paper
US3589980A (en) * 1968-01-02 1971-06-29 Beloit Corp Control of headbox stock characteristics
DE2746179A1 (en) * 1977-10-14 1979-04-19 Bayer Ag METHOD FOR MEASURING THE CHARGE STATE OF SUSPENSIONS AND FOR CONTROLLING THE ADDITION OF ADDITIVES TO SUSPENSIONS
SU718518A1 (en) * 1978-07-05 1980-02-29 Центральный Научно-Исследовательский И Проектно-Констркторский Институт По Проектированию Оборудования Для Целлюлозно-Бумажной Промышленности Apparatus for forming web from fibrous mass
DE2912152A1 (en) * 1979-03-28 1980-10-09 Fr Schiettinger Niederlassung Regulation of superficial weight transverse profile of recycled paper - by diluting water flow determined by humidity meter
US4517285A (en) * 1982-10-20 1985-05-14 The Wiggins Teape Group Limited Papermaking of polyolefin coated supports by controlling streaming potential
DE3514554C3 (en) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Headbox device for a paper machine and method for its operation
DE3715551A1 (en) * 1987-05-09 1988-12-01 Voith Gmbh J M Mfr. of paper with less flutter - by forming stronger edges to the web to prevent flutter
DE3741603A1 (en) * 1987-12-09 1989-06-22 Voith Gmbh J M FABRIC DRAIN FOR A PAPER MACHINE OR THE LIKE.
DE3822783A1 (en) * 1988-07-06 1990-01-11 Basf Ag METHOD FOR CONTROLLING THE ADDITION OF RETENTION AGENTS IN PAPER PRODUCTION
US4940512A (en) * 1988-08-18 1990-07-10 E. I. Du Pont De Nemours And Co.Ny Cross-directional distribution of additives in synthetic papers
DE4005281C2 (en) * 1990-02-20 1995-04-06 Schultz Hans Joachim Dr Ing Headbox with regulation of the basis weight cross-section via the dilution of the fiber suspension
DE4019593C2 (en) * 1990-06-20 1994-01-20 Voith Gmbh J M Headbox for paper machines
DE4112347C3 (en) * 1991-04-16 2001-01-18 Voith Gmbh J M Valve device for the paper industry
DE9205637U1 (en) * 1992-04-25 1992-06-11 J.M. Voith Gmbh, 7920 Heidenheim, De
DE4237309A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008054634A1 (en) 2008-12-15 2010-06-17 Voith Patent Gmbh Forming unit i.e. high-consistent sheet forming unit, for manufacturing graphical paper, has application unit opposite to support surface, where ratio between distance of edge of guiding surface and arc length amounts to specific value

Also Published As

Publication number Publication date
DE4237309A1 (en) 1993-04-08
FI113479B (en) 2004-04-30
ATE139278T1 (en) 1996-06-15
FI934884A0 (en) 1993-11-04
CA2102567A1 (en) 1994-05-06
EP0600251A1 (en) 1994-06-08
JPH06264386A (en) 1994-09-20
JP3494305B2 (en) 2004-02-09
FI934884A (en) 1994-05-06
US5401363A (en) 1995-03-28
DE59302907D1 (en) 1996-07-18

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