EP0995834B1 - Procédé et dispositif pour améliorer le profil transversal du rétrécissement dans une machine à papier - Google Patents

Procédé et dispositif pour améliorer le profil transversal du rétrécissement dans une machine à papier Download PDF

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Publication number
EP0995834B1
EP0995834B1 EP99112905A EP99112905A EP0995834B1 EP 0995834 B1 EP0995834 B1 EP 0995834B1 EP 99112905 A EP99112905 A EP 99112905A EP 99112905 A EP99112905 A EP 99112905A EP 0995834 B1 EP0995834 B1 EP 0995834B1
Authority
EP
European Patent Office
Prior art keywords
shrinkage
fibres
profile
fibers
machine
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
EP99112905A
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German (de)
English (en)
Other versions
EP0995834A1 (fr
Inventor
Udo Grossmann
Günter Dr. Halmschlager
Erich Brunnauer
Alexander Wassermann
Eduard Bachler
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to EP03001610A priority Critical patent/EP1323862B1/fr
Publication of EP0995834A1 publication Critical patent/EP0995834A1/fr
Application granted granted Critical
Publication of EP0995834B1 publication Critical patent/EP0995834B1/fr
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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • D21F1/08—Regulating consistency
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section
    • 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 equalization the property cross profile of a running material web Paper or cardboard according to the preamble of claim 1.
  • the invention relates to a for carrying out the above-mentioned method suitable paper or board machine according to the Preamble of claim 12.
  • a method is known from the published patent application DE 37 15 551 A1 to reduce the flutter of the web edges Paper web, as well as a paper machine for performing this Procedure known.
  • a paper machine for performing this Procedure proposed in the edge region of the paper web to be produced a stock suspension with higher strength potential than in to use the remaining web width range.
  • the Paper machine is suggested to be in the headbox additional lines are provided which are of higher quality Stock suspension in the side areas of the headbox respectively.
  • At least the adjustment of an actuator is based on knowledge of the Behavior of the web property cross profile when changing actuator-derived prediction of impact of the actuator adjustment is made that at least one Web property cross profile before and after the adjustment is measured that the prediction about the impact of Actuator adjustments with the measured effect is compared, and that the existing knowledge be modified until there is a better match between predicted and measured impact.
  • Another object of the invention is a paper or board machine to carry out this method according to the invention To make available.
  • the inventors have recognized that due to the different shrinkage behavior of the paper web the width also others, essential for a good one Paper quality necessary quality criteria, for example the surface roughness or the strength values etc., change across the width depending on the shrinkage cross profile. It should therefore by equalizing the Shrinkage behavior of the paper web not only that Shrinkage behavior itself, but also with it correlated property parameters of the paper via the entire web width can be evened out.
  • the procedure is proposed to strengthen the Shrinkage of a sectional area due to increased Feeding fibers and / or other substances with increased Cause shrinkage tendency, or in another Embodiment in the "normal" mixture of the stock suspension Fibers and / or other substances with less Tendency to shrink due to fibers and / or fabrics with increased Tendency to replace shrinkage.
  • the desired fibers are advantageously added and / or other shrinkage influencing substances in the Headbox.
  • possible changes in basis weight caused by the metering of special fibers etc. could arise through a control mechanism in the known sectioned Headboxes with different material suspensions Concentration fed and controlled sectionally, can be compensated.
  • this is cited State of the art details how the feed from stock suspension of different properties to Headbox performed and the basis weight cross profile the material web can be kept even.
  • the Procedure is used to achieve or obtain a desired cross section suggested that in the constant part the paper machine or board machine at least two Stock suspension flows with fibers with different Shrinkage behavior and / or with other shrinkage influencing substances are provided and in the headbox area by sectional mixing of at least two stock suspension streams with fibers different tendency to shrink, the shrinkage of the Material web is compensated across the machine width, while the basis weight cross profile and / or that Cross section of fiber orientation through sectional addition of White water flows are influenced so that the desired basis weight profiles are retained, or can be achieved.
  • a special embodiment of the method set out above is that as fibers with increased Shrinkage behavior long fibers and as fibers with reduced shrinkage behavior, short fibers are used become.
  • Another or also feasible variant is that as fibers with elevated Shrinkage behavior of highly digested fibers and as Fibers with low shrinkage behavior little disrupted fibers are used.
  • fibers whose shrinkage behavior due to a higher grinding is increased, or their Shrinkage behavior due to less grinding is lowered.
  • CMC Carboxymethyl cellulose
  • fibers respectively Fiber mixtures, the starting material of which is not wood - how for example plastic fibers - represents a possible one Variant.
  • the inventors propose one Paper or board machine with a constant part, a headbox with at least one stock suspension feed from the Constant part, a wet section, a press section and to design a dryer section in such a way that the Constant part has at least two areas different material suspensions with fiber mixtures provide different shrinkage behavior that Stock suspension feeds from the constant part to the Headbox at least two strands for the at least two have different substance suspensions and in the range the headbox has a large number of sectional mixing points are provided, which the substance suspensions with different shrink properties merges.
  • the different Fiber mixtures are made by either Fiber material with longer or shorter fibers is used and / or more or less disrupted fibers and / or more or less ground fibers and / or the Shrinkage influencing substances for the substance suspension be used. According to their processing and / or Structure and / or their starting material produce this Fibers a different shrinkage behavior, which can ultimately be used over the entire Web width a uniform shrinkage behavior of the To generate material web.
  • Figure 1 shows a typical shrink cross profile of paper webs.
  • the edge areas B 1 and B 3 are characterized by high shrinkage gradients and high absolute values of the shrinkage ⁇ 2 .
  • the shrinkage is at a relatively low level and is almost straight and horizontal.
  • This course of shrinkage is typical for many types of paper, but there are also many other forms of cross-section shrinkage. These depend on many parameters, such as the type of paper and the design of the process steps in paper production - for example the drying process.
  • shrinkage transverse profiles with an asymmetrical course or with a non-linear course can also occur in the central region B 2 of the paper web.
  • FIG. 2 shows a shrinkage cross profile 1 after the proportion of fibers with a lower tendency to shrink has been increased in the edge regions B 1 and B 3 of the paper web - or - the proportion of fibers with a greater tendency to shrink has been reduced, while the composition of the stock suspension in the central region B 2 the paper web has remained unchanged.
  • FIG. 3 shows an example of a headbox according to the dilution water principle for the application of the method according to the invention, as described for example in the above-mentioned DE 40 19 593.
  • the suspension Q F is fed in front of the turbulence generator at several feed points 7, distributed over the headbox width.
  • This suspension Q F contains fibers which differ in their shrinkage behavior from the fibers which are contained in the suspension Q H. For example, if the fibers in Q F have a lower tendency to shrink than those in Q H , the cross-sectional shrinkage profile 1 shown in FIG. 1 can be improved by increasing the sectional volume flow Q F at the edges.
  • the feed points 7 for Q F can be distributed uniformly or unevenly - for example only at the edges - over the width of the headbox.
  • the geometry of the feed for Q F can preferably be designed such that the sectional total volume flow at the outlet of the nozzle remains constant despite the variation of Q F.
  • Such a design of a headbox is described in detail in DE 42 11 291.
  • Cross distribution pipes or central distributors can be used to distribute the suspensions over the headbox width.
  • FIG. 4 shows the initial area of a paper machine with a primary headbox 2, which applies stock suspension to a sieve 11.
  • the screen 11 is deflected via rollers 12 and the dewatering of the stock suspension takes place in a known manner via dewatering elements 13, consisting of suction boxes and dewatering strips.
  • a secondary headbox 2.1 is provided, via which the stock suspension Q F can be applied in sections metered over the machine width to the already existing stock suspension layer.
  • FIG. 4a shows view A from FIG. 4, in which the secondary headbox 2.1 is shown.
  • the secondary headbox has a transverse distributor 3.1, via which the stock suspension Q F is fed machine-wide to the first chamber 8.1 of the headbox.
  • a plurality of valves 6 is interposed between the distributor 3.1 and the first chamber 8.1 of the headbox 2.1, which enables a metered supply of the suspension Q F which is sectioned over the machine width.
  • a turbulence generator 9.1 and a subsequent nozzle 10.1 are shown in a known manner.
  • FIG. 5 shows a spatial representation of the beginning of a four-wire paper machine with a headbox 2, to which the high and low-consistent stock suspension streams Q H and Q L are fed.
  • the headbox 2 distributes the stock suspension evenly over the screen 11.
  • the screen 11 is deflected over a plurality of rollers 12 and then on the headbox 2 dewatering elements 13 are provided which dewater the fibrous layer lying on the screen 11.
  • a spray pipe 17 running across the machine width.
  • the spray pipe 17 has a plurality of spray nozzles 15 and 16, which are arranged here by way of example only to the edges of the paper web and thus only the edges of the paper web with the suspension Q F spray.
  • the use of fibers or fiber mixtures, the starting material of which is not wood, such as plastic fibers, is also within the scope of the invention.

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  • Paper (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Claims (12)

  1. Procédé pour l'homogénéisation du profil sens travers des caractéristiques d'une feuille continue de matière en mouvement en papier ou carton avec au moins les étapes de procédé suivantes :
    1.1 génération d'au moins une couche de suspension pâteuse de l'étendue de la laise sur une toile (11) ou entre deux toiles et
    1.2 assèchement, pressage et séchage de la feuille continue de matière produite à partir de la couche de suspension pâteuse, caractérisé en ce que
    1.3 le profil sens travers de contraction (1) de la feuille continue de matière est homogénéisé pendant son processus de production par l'influence sectionnelle via la largeur de la composition locale de la suspension pâteuse en modifiant les proportions des composants avec un comportement de contraction différent.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un renforcement de la contraction d'une zone sectionnelle est provoqué par une alimentation accrue en fibres et/ou autres matières à tendance de contraction accrue.
  3. Procédé selon la revendication 1, caractérisé en ce qu'un renforcement de la contraction d'une zone sectionnelle est provoqué par le remplacement de fibres à tendance de contraction réduite, par des fibres et/ou autres matières à tendance de contraction accrue.
  4. Procédé selon l'une quelconque ou plusieurs des revendications 1-3, caractérisé en ce qu'une réduction de la contraction d'une zone sectionnelle est provoquée par l'alimentation accrue en fibres et/ou autres matières à tendance de contraction réduite.
  5. Procédé selon l'une quelconque ou plusieurs des revendications 1-3, caractérisé en ce qu'une réduction de la contraction d'une zone sectionnelle est provoquée par le remplacement de fibres à tendance de contraction accrue par des fibres et/ou autres matières à tendance de contraction réduite.
  6. Procédé selon l'une quelconque ou plusieurs des revendications 1-5, caractérisé en ce que l'addition dosée en fibres et/ou autres matières souhaitées s'effectue dans la caisse de tête et/ou la partie humide.
  7. Procédé selon l'une quelconque ou plusieurs des revendications 1-6, caractérisé en ce que dans la partie constante de la machine à papier ou carton, au moins deux flux de suspension pâteuse avec des fibres et/ou d'autres matières au comportement de contraction différent sont mis à disposition, et en ce que dans la zone de la caisse de tête, le mélange sectionnel d'au moins deux flux de suspension pâteuse avec des fibres et/ou d'autres matières à tendance de contraction différente permet de compenser la contraction de la feuille continue de matière sur l'étendue de la laise, alors que le profil sens travers du grammage et/ou le profil sens travers de l'orientation des fibres est influencé par le dosage sectionnel d'eau de dilution.
  8. Procédé selon l'une quelconque ou plusieurs des revendications 1-7, caractérisé en ce que des fibres longues sont utilisées en guise de fibres à tendance de contraction accrue, et en ce que des fibres courtes sont utilisées en guise de fibres à tendance de contraction réduite.
  9. Procédé selon l'une quelconque ou plusieurs des revendications 1-8, caractérisé en ce que des fibres fortement digérées sont utilisées en guise de fibres à tendance de contraction accrue, et en ce que des fibres faiblement digérées sont utilisées en guise de fibres à tendance de contraction réduite.
  10. Procédé selon l'une quelconque ou plusieurs des revendications 1-9, caractérisé en ce que des fibres plus fortement raffinées sont utilisées en guise de fibres à tendance de contraction accrue, et en ce que des fibres plus faiblement raffinées sont utilisées en guise de fibres à tendance de contraction réduite.
  11. Procédé selon l'une quelconque ou plusieurs des revendications 1-10, caractérisé en ce qu'en guise d'agents pour l'augmentation de la contraction, de la cellulose carboxyméthylique (CMC) et/ou d'autres matières sont utilisées, et en ce que pour l'inhibition de la contraction, des résines synthétiques et/ou des agents résistants à l'humidité et/ou d'autres matières sont utilisés.
  12. Machine à papier ou carton avec une partie constante, une caisse de tête et au moins une alimentation en suspension pâteuse de la partie constante, une partie humide, une partie de pressage et une partie sèche, moyennant quoi
    12.1 dans la zone de la caisse de tête est prévue une multitude d'alimentations sectionnelles en flux de matières aux caractéristiques différentes et leur mélange, caractérisée en ce que
    12.2 la partie constante présente au moins deux zones qui mettent à disposition des suspensions pâteuses différentes avec des mélanges de fibres au comportement de contraction différent,
    12.3 les alimentations en suspension pâteuse de la partie constante vers la caisse de tête présentent au moins deux tronçons pour les deux au moins des suspensions pâteuses différentes et,
    12.4 dans la zone de la caisse de tête, une multitude de lieux de malaxage sectionnels sont prévus, lesquels amènent ensemble les suspensions pâteuses au comportement de contraction différent.
EP99112905A 1998-09-24 1999-07-05 Procédé et dispositif pour améliorer le profil transversal du rétrécissement dans une machine à papier Expired - Lifetime EP0995834B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03001610A EP1323862B1 (fr) 1998-09-24 1999-07-05 Procédé pour régler le profil transversal du rétrécissement dans une machine à papier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843729 1998-09-24
DE19843729A DE19843729A1 (de) 1998-09-24 1998-09-24 Verfahren und Vorrichtung zur Verbesserung des Schrumpfungs-Querprofils

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP03001610A Division EP1323862B1 (fr) 1998-09-24 1999-07-05 Procédé pour régler le profil transversal du rétrécissement dans une machine à papier

Publications (2)

Publication Number Publication Date
EP0995834A1 EP0995834A1 (fr) 2000-04-26
EP0995834B1 true EP0995834B1 (fr) 2003-11-12

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EP03001610A Expired - Lifetime EP1323862B1 (fr) 1998-09-24 1999-07-05 Procédé pour régler le profil transversal du rétrécissement dans une machine à papier
EP99112905A Expired - Lifetime EP0995834B1 (fr) 1998-09-24 1999-07-05 Procédé et dispositif pour améliorer le profil transversal du rétrécissement dans une machine à papier

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Country Status (6)

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US (1) US6303001B1 (fr)
EP (2) EP1323862B1 (fr)
JP (1) JP2000096475A (fr)
AT (2) ATE254208T1 (fr)
CA (1) CA2283425C (fr)
DE (3) DE19843729A1 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
DE102009028135A1 (de) 2008-08-12 2010-03-11 Metso Paper, Inc. Verfahren und System zur Optimierung von Eigenschaften einer Faserbahn
DE102011003283A1 (de) 2010-02-03 2011-08-04 Metso Paper, Inc. Verfahren und Stoffauflauf zur Verbesserung des Eigenschaftsquerprofils der Faserbahn
DE102022107202A1 (de) 2022-03-28 2023-09-28 Voith Patent Gmbh Mehrlagenfaserstoffbahn

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FI107964B (fi) * 1999-12-31 2001-10-31 Metso Paper Automation Oy Menetelmä ja laitteisto paperikoneen toimilaitteen kohdistuksen identifioimiseksi
US6564117B1 (en) * 2000-06-13 2003-05-13 Abb Automation Inc. Automated optimization of cross machine direction profile control performance for sheet making processes
DE10117236A1 (de) * 2001-04-06 2002-10-17 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Bildung einer Faserstoffbahn
DE10351295A1 (de) * 2003-10-31 2005-06-02 Voith Paper Patent Gmbh Verfahren zum Erzeugen einer Faserstoffbahn und Vorrichtung zur Durchfühung des Verfahrens
DE102005036075A1 (de) * 2005-08-01 2007-02-15 Voith Patent Gmbh Verfahren zur Herstellung von Tissuepapier
CN100400745C (zh) * 2006-07-07 2008-07-09 华南理工大学 一种添加稀释水粗调与微调纸张横幅定量的装置
US20100122786A1 (en) * 2008-11-20 2010-05-20 Tommy Jacobson Application of retention, drainage, and formation (rdf) chemical aids after a headbox of a papermaking process
DE102010030352A1 (de) 2010-06-22 2011-12-22 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
DE102010038891A1 (de) 2010-08-04 2012-02-09 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
US8871059B2 (en) * 2012-02-16 2014-10-28 International Paper Company Methods and apparatus for forming fluff pulp sheets
CN104480769B (zh) * 2014-11-04 2016-08-24 陕西科技大学 一种稀释水水力式流浆箱稀释水阀控制装置及控制方法
JP7035325B2 (ja) * 2017-03-22 2022-03-15 セイコーエプソン株式会社 シート製造装置、シート、及び、シート製造方法
CN116575253A (zh) 2018-01-05 2023-08-11 国际纸业公司 具有增加的弯曲刚度和横向强度的纸产品及其制造方法
DE102021105475A1 (de) 2021-03-08 2022-04-21 Voith Patent Gmbh Einstellbare Querverteilung für einen Stoffauflauf

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009028135A1 (de) 2008-08-12 2010-03-11 Metso Paper, Inc. Verfahren und System zur Optimierung von Eigenschaften einer Faserbahn
DE102011003283A1 (de) 2010-02-03 2011-08-04 Metso Paper, Inc. Verfahren und Stoffauflauf zur Verbesserung des Eigenschaftsquerprofils der Faserbahn
DE102022107202A1 (de) 2022-03-28 2023-09-28 Voith Patent Gmbh Mehrlagenfaserstoffbahn

Also Published As

Publication number Publication date
DE19843729A1 (de) 2000-03-30
JP2000096475A (ja) 2000-04-04
EP1323862B1 (fr) 2006-07-26
EP1323862A1 (fr) 2003-07-02
DE59907702D1 (de) 2003-12-18
CA2283425C (fr) 2008-11-18
ATE254208T1 (de) 2003-11-15
EP0995834A1 (fr) 2000-04-26
DE59913719D1 (de) 2006-09-07
US6303001B1 (en) 2001-10-16
ATE334253T1 (de) 2006-08-15
CA2283425A1 (fr) 2000-03-24

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