EP1028191A2 - Procédé et dispositif pour la production d'une bande - Google Patents

Procédé et dispositif pour la production d'une bande Download PDF

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Publication number
EP1028191A2
EP1028191A2 EP99123538A EP99123538A EP1028191A2 EP 1028191 A2 EP1028191 A2 EP 1028191A2 EP 99123538 A EP99123538 A EP 99123538A EP 99123538 A EP99123538 A EP 99123538A EP 1028191 A2 EP1028191 A2 EP 1028191A2
Authority
EP
European Patent Office
Prior art keywords
suspension
web
section
flow
dosing
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Withdrawn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
EP99123538A
Other languages
German (de)
English (en)
Other versions
EP1028191A3 (fr
Inventor
Dieter Egelhof
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
Voith Sulzer Papiertechnik 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, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1028191A2 publication Critical patent/EP1028191A2/fr
Publication of EP1028191A3 publication Critical patent/EP1028191A3/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Withdrawn legal-status Critical Current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
    • D21F1/08—Regulating consistency
    • 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
    • D21F1/06—Regulating pulp flow

Definitions

  • At least a section of a suspension stream of higher consistency in the direction of flow successive places a suspension stream less Density and at least one metering stream mixed.
  • a suspension stream less Density and at least one metering stream mixed can result in particular a kind of series connection.
  • a suspension stream of higher consistency a suspension stream lower At least consistency and the suspension flow of lower consistency a dosing stream is mixed. This is one in particular cascade-like arrangement possible.
  • the suspension stream lower consistency cascade-like two or more Dosing streams are added.
  • the sectional metered substance flows (D 1 - D i ) for regulating at least one property cross profile of the material web (12) are adjusted or adjusted accordingly.
  • the control is preferably carried out automatically, which means that the sectional metered substance flows are automatically adjusted or adjusted accordingly.
  • a respective property profile of the material web is expedient measured, the measured values obtained with a reference variable compared and the sectional dosing agent flows in the sense of an approximation or adjustment to the reference variable corresponding to or adjusted.
  • the measured values obtained are preferably at least compared to a benchmark based on a concentration of properties, a sectional white water composition and / or the like based.
  • volume flow of a particular dosing stream depending on the product a relevant property size and a factor adjusted or adjusted which is dependent on the retention. That is the volume flow of a Valve influencing the respective metering material flow can thus in particular be adjustable or adjustable according to a control algorithm, after which the valve position is a function of the product from a concerned Property size and a factor that is again a function represents the retention.
  • the invention is therefore particularly based on a multi-layer headbox or a single-layer headbox with different Layers applicable, which increases the distribution of the components not only in the transverse direction, but also in the z direction, i.e. in Can adjust the direction of the material thickness. It can in particular also the cross profiles of such quality features of the material web produced such as. the opacity, brightness, firmness, gloss, color, Moisture, etc. can be influenced in the desired manner.
  • the object is achieved according to the invention solved that for an additional supply of the headbox section by section at least one metering line for supplying at least one Component of the stock suspension containing dosing stream provided is, the volume flow is adjustable to the web composition to influence over the machine width accordingly.
  • the headbox 10 is used to produce the material web 12 used stock suspension over the machine width at least one a web forming zone 16 comprising a belt 14 is fed. in the In the present case, the stock suspension is added to the belt 14.
  • the web formation zone 16 can in principle be one or more sieve belts and in particular also a twin wire former or gap former include.
  • the stock suspension is fed to a sectioned section 18 of the headbox 10 in different section streams Q S1 -Q Sn .
  • a turbulence insert 22 is provided between the section 18 and a nozzle-like outlet 20, for example.
  • At least one metering line l 1 - 1 is section by section for an additional feeding of the headbox 10 i is provided for supplying a metering substance stream D 1 - D i containing at least one component of the stock suspension, the volume flow of which can be adjusted in each case by a controlled and / or regulated valve V 1 - V i . Accordingly, the web composition can be influenced across the machine width.
  • Fig. 4 shows a possible arrangement of metering lines l 1 - l i in a relevant section, through which a type of series connection is formed.
  • the respective section line ls (cf. also FIG. 1) in a respective section is fed with the suspension stream HC of higher consistency C H , the one at the mixing points M 1 , M 2 , M i of the section line 1 S one behind the other in the flow direction L.
  • each mixer, the suspension stream LC of lower consistency C L and the metering agent streams D 1 - D i can be mixed.
  • the suspension stream LC of lower consistency C L is supplied via line I 0 with associated valve V 0 .
  • valve V 0 lies in the flow direction L behind the mixing point M 2 and the valve V 1 behind the mixing point M i . In the present case, this results in a cascade-like arrangement.
  • the suspension stream LC of lower consistency C L can contain, for example, white water and / or water.
  • the different dosing streams can have a different concentration.
  • a respective dosing substance D i can contain, for example, ash, organic fine substance, fiber material, retention aid, starch, brightener, chemicals and / or the like.
  • a mixer can be provided at a respective mixing point M i .
  • the invention is also on a multi-layer headbox or a single-layer headbox different layers applicable. This allows the distribution of the Components not only in the transverse direction, but also in the z direction, i.e. in the direction of the paper thickness, which also creates the cross profiles such quality features of the paper web produced, such as Opacity, brightness, firmness, gloss, color, moisture, etc. affected can be.
  • the valves V i of the metering lines can be set, for example, via control units.
  • an actual value of the concentration or the proportion of the components of a relevant dosing agent flow D i or the quality characteristic of the paper or representative of the suspension is measured in the relevant section. This actual value is compared in the control unit with a target value. If there is a discrepancy between the target and the actual value, the associated valve V i in the metering line D i is adjusted by a pre-calculated value in such a way that the target-actual deviation is again smaller or even compensated.
  • valves In some cases, it is sufficient to manually operate the valves, for example to control. Such a procedure makes sense for such components, their Share only slowly or little during the manufacturing process changes.
  • the sectional metered substance flows D 1 - D i can, for example, be adjusted or adjusted in such a way that at least approximately one or more predeterminable property cross profiles result.
  • the setting can be done manually or automatically and preferably in a controlled manner.
  • the sectional metered substance flows D 1 - D i can thus be set or adjusted accordingly, in particular for regulating one or more property cross-sections of the material web 12. If, for example, automatic control is provided, the sectional metered substance flows D 1 - D i are automatically adjusted or adjusted accordingly.
  • a respective property transverse profile which can the flow rate of a respective Dosierstoffstroms D 1 - D i influencing valve V 1 - V i, for example, according to one a control algorithm or to be adjusted, by which the valve position is a function of the product of a respective characteristic quantity and a factor which is again a function of retention.
  • Another aspect of the invention relates to the combined setting of the local basis weight and the concentration of the proportions of the components in paper.
  • the basis weight cross profile of the paper web produced is impaired, for example, by disturbances due to retention, then the basis weight deviations at the corresponding points, for example according to FIG. 5 (without component D i ), are corrected by adjusting the valve V 0 .
  • the ratio of the volume flows Q LD and D 1, i and D 1 can be kept constant before and after the control intervention (ratio control).
  • the principle for an exemplary local change in the retention is shown purely schematically in FIG. 8.
  • the retention is shown above the basis weight.
  • the solid curve shows the course with normal retention.
  • the curve in the case of impaired retention is indicated by the dashed curve. "1" indicates the target value, "2" a faulty digit and "3" the corresponding correction.

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  • Paper (AREA)
EP99123538A 1999-02-12 1999-11-26 Procédé et dispositif pour la production d'une bande Withdrawn EP1028191A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999106062 DE19906062A1 (de) 1999-02-12 1999-02-12 Verfahren und Vorrichtung zur Herstellung einer Materialbahn
DE19906062 1999-02-12

Publications (2)

Publication Number Publication Date
EP1028191A2 true EP1028191A2 (fr) 2000-08-16
EP1028191A3 EP1028191A3 (fr) 2000-11-22

Family

ID=7897412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123538A Withdrawn EP1028191A3 (fr) 1999-02-12 1999-11-26 Procédé et dispositif pour la production d'une bande

Country Status (2)

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EP (1) EP1028191A3 (fr)
DE (1) DE19906062A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780333A2 (fr) * 2005-10-28 2007-05-02 Voith Patent GmbH Méthode et machine pour produire une bande de matériau fibreux

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10117236A1 (de) * 2001-04-06 2002-10-17 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Bildung einer Faserstoffbahn
DE10351771A1 (de) * 2003-11-06 2005-06-09 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn
DE10355687A1 (de) * 2003-11-28 2005-06-23 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn
DE10358216A1 (de) * 2003-12-12 2005-07-21 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Regelung von mindestens einer prozessrelevanten Eigenschaft während der Herstellung einer Faserstoffbahn

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323263A1 (de) * 1993-07-12 1994-01-13 Voith Gmbh J M Stoffauflauf einer Papiermaschine
EP0600251A1 (fr) * 1992-11-05 1994-06-08 J.M. Voith GmbH Procédé pour uniformiser la composition d'un bande de papier
EP0824157A2 (fr) * 1996-08-14 1998-02-18 Voith Sulzer Papiermaschinen GmbH Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier
WO1998032916A1 (fr) * 1997-01-24 1998-07-30 Valmet Corporation Procede et appareil de regulation de la caisse de tete d'une machine a papier
EP0985762A1 (fr) * 1998-09-03 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Caisse de tête pour la répartition d'une suspension fibreuse et des additifs

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4422907C2 (de) * 1994-06-30 1997-03-06 Voith Gmbh J M Sektionale Stoffzuführung des Stoffauflaufs einer Papiermaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0600251A1 (fr) * 1992-11-05 1994-06-08 J.M. Voith GmbH Procédé pour uniformiser la composition d'un bande de papier
DE4323263A1 (de) * 1993-07-12 1994-01-13 Voith Gmbh J M Stoffauflauf einer Papiermaschine
EP0824157A2 (fr) * 1996-08-14 1998-02-18 Voith Sulzer Papiermaschinen GmbH Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier
WO1998032916A1 (fr) * 1997-01-24 1998-07-30 Valmet Corporation Procede et appareil de regulation de la caisse de tete d'une machine a papier
EP0985762A1 (fr) * 1998-09-03 2000-03-15 Voith Sulzer Papiertechnik Patent GmbH Caisse de tête pour la répartition d'une suspension fibreuse et des additifs

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780333A2 (fr) * 2005-10-28 2007-05-02 Voith Patent GmbH Méthode et machine pour produire une bande de matériau fibreux
EP1780333A3 (fr) * 2005-10-28 2007-07-25 Voith Patent GmbH Méthode et machine pour produire une bande de matériau fibreux
US7763148B2 (en) 2005-10-28 2010-07-27 Voith Patent Gmbh Method and apparatus for producing a fibrous web

Also Published As

Publication number Publication date
EP1028191A3 (fr) 2000-11-22
DE19906062A1 (de) 2000-08-17

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