EP0997578A1 - Caisse de tête - Google Patents

Caisse de tête Download PDF

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Publication number
EP0997578A1
EP0997578A1 EP99116257A EP99116257A EP0997578A1 EP 0997578 A1 EP0997578 A1 EP 0997578A1 EP 99116257 A EP99116257 A EP 99116257A EP 99116257 A EP99116257 A EP 99116257A EP 0997578 A1 EP0997578 A1 EP 0997578A1
Authority
EP
European Patent Office
Prior art keywords
jet
wall
machine direction
support elements
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.)
Granted
Application number
EP99116257A
Other languages
German (de)
English (en)
Other versions
EP0997578B1 (fr
Inventor
Wolf Gunter Stotz
Thomas Merath
Klaus Lehleiter
Christoph Link
Josef Frey
Eckart Krägeloh
Thomas Dietz
Simon Juhas
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
Priority claimed from DE29823639U external-priority patent/DE29823639U1/de
Priority claimed from DE19927241A external-priority patent/DE19927241A1/de
Application filed by Voith Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to EP03100988A priority Critical patent/EP1342835B1/fr
Publication of EP0997578A1 publication Critical patent/EP0997578A1/fr
Application granted granted Critical
Publication of EP0997578B1 publication Critical patent/EP0997578B1/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
    • D21F1/024—Details of the feed chamber
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section

Definitions

  • the invention relates to a headbox for a paper machine with a extending across the machine width across the machine direction Nozzle, a lower and an upper, each over the machine width extending continuous wall (see the generic term of claims 1 and 10). It also relates to a headbox the preamble of claim 16.
  • the aim of the invention is to provide a headbox of the type mentioned create, with the most cost-effective design, easy handling and minimal maintenance practically independent of the always a parallel outlet gap as possible under the respective operating conditions guaranteed.
  • this object is achieved in that the lower Nozzle wall over several separate ones distributed over the machine width Support elements is supported on a foundation and that these support elements Completely flexible or flexible across the machine direction are.
  • the support elements carry essentially the entire headbox. At a temperature-related change in length of the lower nozzle wall these support elements perpendicular to the machine direction to.
  • the lower nozzle wall remains at a temperature and / or Pressure change sufficiently flat. This can also be the usual Heating system to compensate for the thermal deflection of the lower one No nozzle wall.
  • the individual support elements can be at least partially general vertical, i.e. perpendicular to the lower nozzle wall.
  • the individual support elements are preferably at least partially through discs parallel to the machine direction, by means of stud bolts or the like.
  • the support elements can be directly or via a base plate and / or a base can be connected to the foundation.
  • the support elements can, for example, with the lower nozzle wall be connected.
  • the support elements are connected to the support plate.
  • At least one Diagonal or cross bracing provided.
  • a headbox is already described in DE 41 06 764 A1, in which the upper nozzle wall over flexible rods with a stiff beam connected is.
  • the headbox can in particular be provided with a central assembly be one through the lower nozzle wall or the one assigned to it Support plate formed lower arm, preferably a parallel to this upper arm, an inlet-side first central part and one in the machine direction behind the second central part, the upper arm and the two arranged between this and the lower arm Central parts preferably support elements of a turbulence generator form. It is conceivable, for example, that the cross member via at least one lifting element, preferably via at most three lifting elements and in particular via only one lifting element or only two Lifting elements is connected to the central assembly.
  • the individual support elements extend at least partially generally vertical, i.e. perpendicular to the upper nozzle wall.
  • the individual support elements are preferably at least partially through discs parallel to the machine direction are formed.
  • the cross member can, for example, by an upright sheet metal or be formed by a hollow beam.
  • the central assembly is thus a partially segmented C-shaped Brackets formed, in principle only those parts not segmented are, i.e. are executed continuously in the transverse direction Limit rooms that contain substances.
  • This third solution according to the invention can alternatively or in combination provided with the two previous solutions according to the invention be, in the latter case both a combination with the first or second solution as well as a combination of all three solutions is conceivable.
  • the upper nozzle wall is hinged around itself is pivotable transversely to the machine direction axis at the rear or downstream end of the machine in the machine direction upper arm of the central assembly preferably a cross to Continuous hinge bearing extending in the machine direction is provided.
  • This hinge bearing can be in the area between each Segments of the adjacent upper arm each have a material weakening exhibit.
  • this is due to the distances division of the segments defined from segment center to segment center of the upper arm of the central assembly equal to the division of the Segments of the rear or downstream second central part of the central assembly.
  • the parallelism of the outlet gap can be achieved among all operating conditions that are practically possible are ensured.
  • Deformations of the upper and lower nozzle walls under changing Pressure in the nozzle and / or under changing material temperature are therefore at least essentially excluded.
  • Are in Operation the nozzle walls are pressed apart under the liquid pressure, so the resulting expansion forces by means of the above numerous support elements or support elements across the machine width forwarded pretty evenly. A deflection of the nozzle walls is thus avoided.
  • there is an extremely inexpensive construction i.e. in particular a reduced effort for material and manufacturing (e.g. processing) as well as for control and regulation devices.
  • In addition to easier handling in operation there is also a reduced maintenance.
  • the component cross-sectional dimensions can be the same for different ones Headboxes of different machine widths. This simplifies the Drafting and manufacturing.
  • the supporting elements must only according to the maximum pressure in the nozzle be dimensioned.
  • one or more, e.g. two, hydraulic cylinder and linear stroke flow divider be provided as a drive for such a displaceable lower nozzle wall.
  • linear stroke flow dividers the MLH series from Jahns-Regulatoren GmbH, D-63069 Offenbach, as used in a corresponding company publication of Jahns-Regulatoren GmbH from March 1997 are.
  • With a larger machine width for example, in the middle area one or two additional hydraulic cylinders can be provided.
  • Figures 1 and 2 show a first in a purely schematic representation Embodiment of a headbox 10 for a Fourdrinier former Paper machine.
  • the headbox 10 comprises a cross-machine direction L across the machine width nozzle 12 with a lower and a upper, continuous, each extending across the machine width Wall 14 and 16.
  • the upper nozzle wall 16 via a hinge 18 to a transverse to the machine direction L extending axis A pivotable.
  • the lower nozzle wall 14 on a stationary support plate 20 slidable in machine direction L.
  • a central assembly 22 of the headbox 10 includes one herein Case formed by the support plate 20 lower arm, one for this preferably at least substantially parallel upper arm 24 upstream first central part 26 and a machine direction L second central part 28 lying further back or downstream form the upper arm 24 and the two between this and the lower Arm 20 arranged central parts 26, 28 preferably support elements a turbulence generator.
  • the support plate lower nozzle wall instead of Support plate 20 this lower nozzle wall or a corresponding section of which are assigned to the central assembly 22.
  • the central assembly 22 is, for example, via a cross manifold 30 fiber suspension 32 fed.
  • the one designed as a turbulence generator in the present exemplary embodiment Central assembly 22 is with multiple step diffusers or with stepless turbulence pipes. Via the lower nozzle wall 14 and the upper nozzle wall 16 and side boundaries 34 such as Side signs or the like will flow up to one Outlet gap 36 out. The one emerging from the outlet gap 36 machine-wide cloth jet arrives in the area of a breast roller 38 an endless rotating sieve belt 40.
  • the stationary support plate 20 for the lower nozzle wall 14 or a stationary one Nozzle wall is distributed over several across the machine width separate support elements 42 supported on a foundation 44.
  • the Support elements 42 are flexible or transverse to the machine direction L. designed to be flexible.
  • the individual support elements 42 vertically, i.e. perpendicular to the lower nozzle wall 14 or the support plate 20.
  • these are support elements 42 formed by disks parallel to the machine direction L.
  • the support elements 42 are over one e.g. made of concrete base 46 connected to the foundation 44. Basically, these support elements 42 can also directly be connected to the foundation 44. At the other end are the support elements 42 each connected to the support plate 20. In the case of one, not displaceable, i.e. integrally formed with the support plate lower Nozzle wall would be the support elements with the non-displaceable lower one Nozzle wall connected.
  • FIG. 2 is between the two transverse to the machine direction L considered central support elements 42, a diagonal bracing 48 is provided.
  • a directly connected to the support plate 20 is missing Cross member. Accordingly, it was also possible to use a heating system for compensation thermal bending of the support plate 20 or the nozzle wall 14 can be dispensed with. At most, heating devices are conceivable (not shown) for changing the height of at least one of the support elements 42, in the case of (but hardly expected) one Deformation of the foundation 44 or the base 46.
  • the upper nozzle wall which can be pivoted about the transverse axis A via the hinge 18 16 is separated over several over the machine width Support elements 50 arranged above the pivot axis A. Cross member 52 connected.
  • the support elements 50 are again transverse to Machine direction L resilient or flexible.
  • the individual parts extend Support elements 50 vertical, i.e. perpendicular to the upper nozzle wall 16.
  • the individual support elements 50 again formed by disks parallel to the machine direction L.
  • An upright sheet metal or, for example, can be used as the cross member 52 a hollow beam can be provided (cf. in particular FIG. 1).
  • One or more lifting elements 54 are on the one hand on the central assembly 22 and on the other hand on the cross member 52 via articulated axes 56 or 58 articulated.
  • the upper nozzle wall is via these lifting elements 54 16 can thus be pivoted about the axis A in the direction of the arrow F (see FIG. 1).
  • the lifting elements 54 can be, for example Actuate threaded spindles, hydraulic cylinders and / or the like.
  • Lifting elements 60 are provided.
  • the lower nozzle wall 14 over two on opposite sides provided hydraulic cylinders 60 and linear stroke flow dividers as they e.g. brought onto the market by Jahns-Regulatoren GmbH become. If the machine width is large, one or two additional lifting elements or hydraulic cylinders 60 'can be provided.
  • the upper arm 24 and the second central part in the machine direction L rear 28 of the central assembly 22 transversely to the machine direction L each segmented.
  • Figure 3 shows a schematic perspective view of the central Assembly 22 of a headbox. If the lower nozzle wall 14 (see FIG 1) is not displaceable, it can be made in one piece with the support plate 20 be trained.
  • FIG. 4 shows the schematic perspective illustration again central assembly of a headbox, intended for one on a stationary Support plate 20 movable in the machine direction L, in the Figure 4 omitted lower nozzle wall 14 (see also Figures 1 and 2).
  • the stationary support plate 20 is also transverse to the machine direction L segmented.
  • the hinge has 62 a constant across the machine direction L. Cross-section.
  • the hinge bearing 62 in the case of the in the figure 4 shown central assembly 22 in the area between the individual Segments 24 'of the adjacent upper arm 24 each have a material weakening 66 on. It is also conceivable, for example, that the Hinge bearing 62 according to Figure 4 from a continuous lower part and composed of several (ie segmented) upper parts is.
  • the one defined by the distances from segment center to segment center Division of the segments 24 'of the upper arm 24 of the central assembly 22 is in both embodiments shown in Figures 3 and 4 equal to the division of the segments 28 'of the rear in the machine direction L second central part 28 of the central assembly 22.
  • this is due to the distances from the center of the element division of the support elements 42 and the support elements defined in the middle of the element 50 is equal to the division of the segments 20 ', 24', 28 'of the central assembly 22.
  • Figure 5 shows a schematic, partially sectioned side view Another embodiment of a headbox 10 for a twin wire former.
  • one of the central assembly 22 is connected upstream Inlet part 66 over the fiber suspension through the cross distributor pipe 30 several lines 68 are supplied, one transverse to the machine direction L sectioned consistency control can be provided.
  • the one out The machine-wide stream of material emerging from the outlet gap 36 enters an inlet gap 74 formed between two sieve belts 70, 72.
  • the headbox 10 While in the embodiment shown in Figures 1 and 2 the headbox 10 is oriented substantially horizontally, is the Headbox 10 in the embodiment shown in Figure 5 with its outlet gap 36 obliquely upwards in between the two Sieve belts 70, 72 formed inlet gap 74 directed.
  • this headbox 10 has at least essentially again the same structure as in the embodiments according to the Figures 1 to 4.

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  • Paper (AREA)
EP99116257A 1998-10-05 1999-08-18 Caisse de tête Expired - Lifetime EP0997578B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03100988A EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE29823639U 1998-10-05
DE29823639U DE29823639U1 (de) 1998-10-05 1998-10-05 Stoffauflauf
DE19927241A DE19927241A1 (de) 1998-10-05 1999-06-15 Stoffauflauf
DE19927241 1999-06-15

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP03100988A Division EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête
EP03100988A Division-Into EP1342835B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Publications (2)

Publication Number Publication Date
EP0997578A1 true EP0997578A1 (fr) 2000-05-03
EP0997578B1 EP0997578B1 (fr) 2004-04-28

Family

ID=26053777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99116257A Expired - Lifetime EP0997578B1 (fr) 1998-10-05 1999-08-18 Caisse de tête

Country Status (2)

Country Link
EP (1) EP0997578B1 (fr)
AT (1) ATE265571T1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626120A1 (fr) * 2004-08-06 2006-02-15 Voith Paper Patent GmbH Caisse de tête pour machine pour fabriquer une bande de matière fibreuse, notamment une bande de papier ou de carton
EP1653000A1 (fr) * 2004-08-06 2006-05-03 Voith Paper Patent GmbH Caisse de tête pour machine pour fabriquer une bande de matière fibreuse, notamment une bande de papier ou de carton
DE102008042032A1 (de) 2008-09-12 2010-03-18 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
DE102009045166A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
DE102009045221A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313681A (en) * 1964-08-27 1967-04-11 Beloit Corp Headbox with bottom wall having controllable deflection
DE3628699A1 (de) * 1986-08-23 1988-03-03 Voith Gmbh J M Stoffauflauf
DE4106764A1 (de) * 1991-02-22 1992-08-27 Voith Gmbh J M Kanalwand, insbesondere fuer einen papiermaschinen-stoffauflauf

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313681A (en) * 1964-08-27 1967-04-11 Beloit Corp Headbox with bottom wall having controllable deflection
DE3628699A1 (de) * 1986-08-23 1988-03-03 Voith Gmbh J M Stoffauflauf
DE4106764A1 (de) * 1991-02-22 1992-08-27 Voith Gmbh J M Kanalwand, insbesondere fuer einen papiermaschinen-stoffauflauf

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1626120A1 (fr) * 2004-08-06 2006-02-15 Voith Paper Patent GmbH Caisse de tête pour machine pour fabriquer une bande de matière fibreuse, notamment une bande de papier ou de carton
EP1653000A1 (fr) * 2004-08-06 2006-05-03 Voith Paper Patent GmbH Caisse de tête pour machine pour fabriquer une bande de matière fibreuse, notamment une bande de papier ou de carton
DE102008042032A1 (de) 2008-09-12 2010-03-18 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
DE102009045166A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier- oder Kartonbahn
DE102009045221A1 (de) 2009-09-30 2011-03-31 Voith Patent Gmbh Turbulenzerzeuger für einen Stoffauflauf, Stoffauflauf und Verfahren zur Herstellung des Turbulenzerzeugers
WO2011038945A2 (fr) * 2009-09-30 2011-04-07 Voith Patent Gmbh Caisse de tête pour une machine servant à produire une bande de matière fibreuse, en particulier une bande de papier ou de carton
WO2011038945A3 (fr) * 2009-09-30 2012-07-19 Voith Patent Gmbh Caisse de tête pour une machine servant à produire une bande de matière fibreuse, en particulier une bande de papier ou de carton

Also Published As

Publication number Publication date
EP0997578B1 (fr) 2004-04-28
ATE265571T1 (de) 2004-05-15

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