EP1717366A1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP1717366A1
EP1717366A1 EP06008241A EP06008241A EP1717366A1 EP 1717366 A1 EP1717366 A1 EP 1717366A1 EP 06008241 A EP06008241 A EP 06008241A EP 06008241 A EP06008241 A EP 06008241A EP 1717366 A1 EP1717366 A1 EP 1717366A1
Authority
EP
European Patent Office
Prior art keywords
module
tubes
flow straightener
paper stock
diluting
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Withdrawn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
EP06008241A
Other languages
German (de)
English (en)
Inventor
Krzysztof Zodz
Zdzislaw Przybysz
Sylwester Woloszyn
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.)
PMPoland SA
Original Assignee
PMPoland SA
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 PMPoland SA filed Critical PMPoland SA
Publication of EP1717366A1 publication Critical patent/EP1717366A1/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Withdrawn legal-status Critical Current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
    • 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
    • D21F1/02—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
    • D21F1/026—Details of the turbulence 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a head box, particularly used in a paperindustry.
  • the raw material for the paper manufacturing ⁇ most frequently it is a water solution of fiber suspension ⁇ is supplied through a header into a head box mainly from a side. Then, a suspension is distributed onto a forming section of a paper machine by passing through elements equalizing a suspension flow and an outlet gap of a box.
  • a feed accuracy of a paper machine from a head box is a significant factor for a range of a basis weight tolerance of a produced paper both in the machine and cross direction of a paper web.
  • a feeding header is convergent in shape.
  • Supplied paper stock changes the flow direction, flows through a stabilizing system said tube bank into an outlet chamber and from that chamber is distributed through the outlet gap onto the wire of a paper machine.
  • a change of outflow head is one of a method to control the flow from the headbox.
  • the another method is zone dilution of a fibrous stock by an introducing of diluting medium into the high basis weight zones.
  • the tube bank is a monolith and it does not allow to make a significant rebuilt of the head box. In this case if there is necessary to modify the paper machine because of change of its capacity or paper grade the whole head box must be replaced with new one.
  • the new type of the head box comprises a tube bank of at least two modules: a flow straightener and a module of diffuser nozzle.
  • the module of flow straightener is a solid structure in the shape of a beam situated transversely to a main axis of a paper machine and the direction of paper web movement.
  • the tubes of flow straightener are located inside the module and their direction correspond with the axis of the paper machine.
  • the tubes of the straightener could be favourably round in shape along their entire length.
  • the module of flow straightener adjoins the module of diffuser nozzle which is also in shape of the cross beam containing inside the tubes of diffuser. These tubes are favourably round in shape from the stock inlet side and change smoothly toward the outlet to flattened oval resembling shape.
  • the diameter of diffuse tubes is bigger than the diameter of flow straightener.
  • the aforesaid described module arrangement of tube bank enables to introduce the diluting medium - favourably wire pit water or clarified water - into the adjoining zone of flow straightener and diffuser nozzle module.
  • the holes supplying the diluting medium could be made in the plate located at the outlet of stock from the flow straightener to the diffuser nozzle module.
  • the holes are favourably made in the center lines of straightener tubes rows and they are perpendicular to these tubes; moreover the end parts of the holes where the tubes of flow straightener come through are selectively enlarged so that the diluting medium together with the paper stock fed from the flow straightener could gain access into the appropriate tube of the diffuser nozzle module.
  • the next solution is a system of additional tubes connected to the same plate of the flow straightener.
  • Appropriately selected holes in the plate are counterbored together with some holes of the tubes of flow straightener and as described previously it will allow the flow of stock together with the diluting medium into the appropriate tube of the diffuser nozzle module.
  • the diluting medium is supplied into the that places of the head box where the diameter of the flow is enlarged substantially and due to that, the mass flow is moderated and the effect of pressure rise due to introducing of the diluting medium is reduced and the mass flow through the headbox is equalized.
  • Fig.1 presents the side view of the head box
  • Fig.2 presents the module of flow straightener with the holes pattern in the plate where diluting medium is introduced. It is the cross section and side view.
  • Fig.3 presents the axial section of the connected modules of the tube bank and also detail X showing the junction point of a straightener tube and holes of diluting medium (example I).
  • Fig.4 presents the axial section of the connected modules as an arrangement with the additional tubes supplying diluting medium and detail X showing the connections of stock outlets and diluting medium (example II).
  • Fig.5 presents the main view and the side views of the tube of the diffuser nozzle.
  • the head box according to the invention has a tube bank comprising a flow straightener 1 and module of diffuser nozzle 2.
  • the straightener is fed at least with one supplying header KZ.
  • the box is equipped with set of holes 4 in a plate 3 to introduce the diluting medium into the zone W.
  • the box has additional set of tubes 6 and plate 3 has counterbores 7 connecting outlets of tubes of flow straightener and tubes 6 of diluting system.
  • An object of the invention is to provide a simplified modification of head boxes due to easy replacement of flow straightener with another one.

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  • Paper (AREA)
EP06008241A 2005-04-26 2006-04-21 Caisse de tête Withdrawn EP1717366A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL374677A PL205833B1 (pl) 2005-04-26 2005-04-26 Skrzynia wlewowa

Publications (1)

Publication Number Publication Date
EP1717366A1 true EP1717366A1 (fr) 2006-11-02

Family

ID=36579813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06008241A Withdrawn EP1717366A1 (fr) 2005-04-26 2006-04-21 Caisse de tête

Country Status (2)

Country Link
EP (1) EP1717366A1 (fr)
PL (1) PL205833B1 (fr)

Cited By (2)

* 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
AT509623A3 (de) * 2010-04-08 2013-02-15 Metso Paper Inc Konstruktionselement für den stoffauflauf einer faserbahnmaschine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5196091A (en) * 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control
US5814191A (en) * 1996-06-20 1998-09-29 Valmet Corp. Arrangement and method for combining a dilution flow with a stock flow passed out of an inlet header in a paper/board machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5196091A (en) * 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control
US5814191A (en) * 1996-06-20 1998-09-29 Valmet Corp. Arrangement and method for combining a dilution flow with a stock flow passed out of an inlet header in a paper/board machine

Cited By (4)

* 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
AT509623A3 (de) * 2010-04-08 2013-02-15 Metso Paper Inc Konstruktionselement für den stoffauflauf einer faserbahnmaschine
AT509623B1 (de) * 2010-04-08 2013-10-15 Metso Paper Inc Konstruktionselement für den stoffauflauf einer faserbahnmaschine
DE102011006778B4 (de) 2010-04-08 2018-10-11 Valmet Technologies, Inc. Konstruktionselement für den Stoffauflauf einer Faserbahnmaschine

Also Published As

Publication number Publication date
PL374677A1 (pl) 2006-07-24
PL205833B1 (pl) 2010-05-31

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