EP0620876A1 - Procede et dispositif de reglage de la section transversale de la pate amenee a la caisse de tete d'une machine a papier. - Google Patents

Procede et dispositif de reglage de la section transversale de la pate amenee a la caisse de tete d'une machine a papier.

Info

Publication number
EP0620876A1
EP0620876A1 EP92923080A EP92923080A EP0620876A1 EP 0620876 A1 EP0620876 A1 EP 0620876A1 EP 92923080 A EP92923080 A EP 92923080A EP 92923080 A EP92923080 A EP 92923080A EP 0620876 A1 EP0620876 A1 EP 0620876A1
Authority
EP
European Patent Office
Prior art keywords
distributor
headbox
section
paper machine
white water
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.)
Granted
Application number
EP92923080A
Other languages
German (de)
English (en)
Other versions
EP0620876B1 (fr
Inventor
Hans-Joachim Dr Schultz
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT92923080T priority Critical patent/ATE144566T1/de
Publication of EP0620876A1 publication Critical patent/EP0620876A1/fr
Application granted granted Critical
Publication of EP0620876B1 publication Critical patent/EP0620876B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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 one or more headboxes for multilayer sheet formation and single or multilayer sheet formation on paper machines. It affects the entire sheet formation system consisting of
  • the thick stock of the machine chest has been fed to the suction port of the mixing pump and diluted to the stock density for the headbox. Influences due to pressure sorting, hydrocyclone and ventilation device are not taken into account.
  • This substance diluted in the ratio of 1: 2 to 1:12, reaches the headbox via a pulsation damper for uniform distribution over the web width onto the screen.
  • the headbox nozzle is equipped with mechanical actuators for adjusting the outlet gap. It is precisely this cross-profile adjustment on the nozzle that leads to tension in the paper with known secondary problems such as lack of flatness and other things.
  • the aforementioned vibration damper or pulsation damper is also to be used as a distributor with cross profile control. In this case, however, this is not done by means of a second, additional (post) dilution of the substance. Rather, in the case of the present invention, the thick matter is no longer added in the suction port of the mixing pump, but is metered directly into the individual distributor lines of the distributor, in order then to set the cross profile with the amount of substance.
  • the substance can be added to several headboxes from a white water system via a vibration damper distributor.
  • one or more headboxes can each have different substance types, e.g. B. to build up a sandwich construction.
  • the drawing shows various embodiments of the device according to the invention on the basis of the vibration damper and its further development as a distributor.
  • the thick matter feeder is installed here, which was previously carried out via the suction port of the mixing pump (which is then usually followed by the known cross-distributor for the fibrous stock suspension).
  • the thick matter is controlled in the individual distribution lines via valves or in Control loop regulated admitted.
  • Figures 1 and 2 show a section through the device consisting of the basic elements, vibration damper with distribution system for the white water, and the thick matter feed installed therein with distribution of the thick matter via control and regulating valves.
  • the liquid namely the white water, passes through the feed line 3, the diffuser 4 and through the perforated plate 5 into the distributor space 6. Above this is the air cushion 7.
  • the liquid is supplied via the distributor row 2 with distributor connections 8 - these are 2x13 Distribution ports - distributed.
  • the air pressure is built up via the valve 9 and the level of the white water in the distributor 1 is maintained via the valve 10.
  • the thick matter is metered via the inlet 11 with the distributor 12 into - in the present case - 2x13 metering lines 13 which open into the center 14 of the distributor connections 8.
  • Each of these metering lines 13 is equipped with a control valve 15.
  • Figures 3 and 4 show a section through another embodiment of the device according to the invention with partial use of the aforementioned names.
  • the device according to Figures 1 and 2 is only suitable for a single thick matter quality due to the central feed. However, the distribution can take place over 1, 2 or more headboxes.
  • Figures 3 and 4 show a similar device. This time, the material is fed via ring lines on the outer wall of the vibration damper distributor 19. The designations correspond partially those of Figures 1 and 2.
  • the thick matter metering system is superimposed on the vibration damper with distributor 1. Due to the design, 1, 2 or more thick material feed lines can be attached. 3 and 4, two feed lines 20, 21 are provided. Different thick matter qualities can therefore be conveyed in the feed lines 20, 21. For multi-layer sheet formation, this is the development for the future.
  • FIG. 5 shows the device according to FIGS. 3 and 4 when used on two headboxes 23, 24 on a fourdrinier wire 25. So there are two issues here. These can be loaded with the same or different fiber suspension.
  • FIGS. 6 and 7 show the possibility of applying the method according to the invention and the device according to the invention to multilayer sheet formation, here for two-layer sheet formation on a twin-wire system. Side and top views are shown.
  • the thick material partial flows are designated 30 and 31.
  • the thick material partial streams 30, 31 are delivered via delivery elements 32 and. 33 controlled or regulated distributed in sections across the machine width.

Landscapes

  • Paper (AREA)

Abstract

Dans la plupart des machines à papier actuelles, la section transversale est réglée par déformation de la fente de sortie de l'ajutage de la caisse de tête. Il en résulte les défauts connus d'asymétrie du papier. Plus récemment, on a introduit le réglage de la section transversale par dilution ultérieure des courants partiels individuels amenés à la caisse de tête. L'invention se caractérise par le fait que la pâte épaisse amenée à une caisse de tête n'est plus diluée dans son ensemble, mais est distribuée en fonction de la section transversale demandée à la machine. La pâte est diluée dans les courants partiels jusqu'à la densité requise pour la caisse de tête avec l'eau d'égouttage. On peut ainsi rassembler les systèmes d'eau d'égouttage de plusieurs caisses de tête et les approvisionner, au moyen du dispositif décrit, en pâte de qualités identiques ou différentes. L'avantage en est que l'on peut régler la section transversale sans déformer l'ajutage de la caisse de tête et que l'on peut simplifier considérablement le système d'eau d'égouttage lors de la formation de feuilles de papier multiplex ou à couches multiples superposées avec des pâtes de qualités identiques ou différentes.
EP92923080A 1992-11-12 1992-11-12 Procede et dispositif de reglage de la section transversale de la pate amenee a la caisse de tete d'une machine a papier Expired - Lifetime EP0620876B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT92923080T ATE144566T1 (de) 1992-11-12 1992-11-12 Verfahren und einrichtung zum einstellen des querprofiles der stoffabgabe am stoffauflauf einer papiermaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1992/000943 WO1994011572A1 (fr) 1992-11-12 1992-11-12 Procede et dispositif de reglage de la section transversale de la pate amenee a la caisse de tete d'une machine a papier

Publications (2)

Publication Number Publication Date
EP0620876A1 true EP0620876A1 (fr) 1994-10-26
EP0620876B1 EP0620876B1 (fr) 1996-10-23

Family

ID=6875430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92923080A Expired - Lifetime EP0620876B1 (fr) 1992-11-12 1992-11-12 Procede et dispositif de reglage de la section transversale de la pate amenee a la caisse de tete d'une machine a papier

Country Status (3)

Country Link
EP (1) EP0620876B1 (fr)
DE (1) DE59207442D1 (fr)
WO (1) WO1994011572A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7578906B2 (en) 2006-02-01 2009-08-25 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005281C2 (de) * 1990-02-20 1995-04-06 Schultz Hans Joachim Dr Ing Stoffauflauf mit Regelung des Flächengewicht-Querprofiles über die Verdünnung der Fasersuspension
DE4114668C2 (de) * 1991-05-06 1995-10-26 Schultz Hans Joachim Dr Ing Verfahren zur Flächengewichts-Querprofilregelung in einem Blattbildungssystem und Vorrichtung zur Durchführung des Verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9411572A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7578906B2 (en) 2006-02-01 2009-08-25 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine

Also Published As

Publication number Publication date
EP0620876B1 (fr) 1996-10-23
WO1994011572A1 (fr) 1994-05-26
DE59207442D1 (de) 1996-11-28

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