EP2017383A2 - Dispositif destiné à la fabrication d'une bande de matière fibreuse - Google Patents

Dispositif destiné à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP2017383A2
EP2017383A2 EP08160074A EP08160074A EP2017383A2 EP 2017383 A2 EP2017383 A2 EP 2017383A2 EP 08160074 A EP08160074 A EP 08160074A EP 08160074 A EP08160074 A EP 08160074A EP 2017383 A2 EP2017383 A2 EP 2017383A2
Authority
EP
European Patent Office
Prior art keywords
headbox
lower lip
nozzle
jet
lip
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Withdrawn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
EP08160074A
Other languages
German (de)
English (en)
Other versions
EP2017383A3 (fr
Inventor
Markus Häußler
Klaus Lehleiter
Konstantin Fenkl
Johann Moser
Wolfgang Ruf
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 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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2017383A2 publication Critical patent/EP2017383A2/fr
Publication of EP2017383A3 publication Critical patent/EP2017383A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • D21F1/028—Details of the nozzle 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
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to a device for producing a fibrous web, in particular paper or board web, comprising a headbox delivering a headbox, which comprises a headbox whose nozzle space is delimited by a lower lip and an opposite upper lip or aperture and two opposing side walls, and For generating the suspension jet having an exit slit.
  • the lower lip board has hitherto been dimensioned relatively large, whereby it was regularly larger than twice the exit gap height for this purpose.
  • the usual headbox nozzles showed no appreciable dependence of the jet launch angle on the exit gap height.
  • Fig. 1 shows in a schematic partial representation of such a nearly symmetrical headbox 10.
  • the given in the usual headboxes of paper or board machines using such a nearly symmetrical headbox increased dependence of the beam launch angle ⁇ from the exit slit height s and the lower lip board I results from the Fig. 2 ,
  • the headbox 10 has a nozzle chamber 12, which is bounded by a lower lip 14 and an opposite upper lip or orifice 16 and two opposing side walls (not shown). It is also provided with an outlet gap 20 for producing the suspension jet 18.
  • the exit gap height is denoted by “S” and the lower lip board opposite to the upper lip 16 by "I”.
  • the beam launch angle ⁇ is shown above the lower lip board I for different exit gap heights s.
  • the direction of increasing exit slit height s is indicated by the arrow 22.
  • a preferably local change of the exit slit height for optimizing the fiber orientation transverse profile is critical, since in particular local adjustments the exit gap height directly bring local changes in the beam launch angle.
  • a new ratio of lower lip board I and exit slit height s changes the bullet geometry, in particular the Strahlauf Economicsgeometrie or the Strahlauf Economicsddling and can thus lead to possible leaf disturbances.
  • An on the machine width constant insertion geometry of the suspension jet delivered from the headbox into the sheet forming unit is no longer given.
  • the invention has for its object to provide an improved device of the type mentioned, in which the aforementioned problems are eliminated.
  • a suspension jet supplying headbox which includes a headbox, the nozzle space is bounded by a lower lip and an opposite upper lip or orifice and two opposing side walls, and which has an outlet gap for generating the suspension jet.
  • the headbox nozzle is such that changes in the measured perpendicular to the inside of the lower lip exit slit height by an amount of 1 mm, the jet discharge angle between the suspension jet and the inside of the lower lip by more than 0.1 °.
  • a device is provided for feeding and / or withdrawing a respective predeterminable volume flow into or out of the two lateral edge regions of the nozzle chamber.
  • a device for repositioning of the headbox in response to the respective exit slit height is provided to the extent possible to maintain the Strahlauf Economicsgeometrie as far as possible.
  • the device according to the invention thus comprises a headbox whose nozzle can be referred to as at least substantially symmetrical.
  • means are also provided by which the undesirable side effects previously encountered in connection with such at least substantially symmetrical headbox nozzles, in particular the strong dependence of the jet launching angle on the exit gap height, etc., are at least substantially compensated.
  • the optimization of the formation transverse profile can now take place independently of the local beam launch angle using an at least approximately symmetrical headbox nozzle.
  • the jet injection conditions in the sheet forming unit are thus constant over the full machine width.
  • a correspondingly regulated repositioning of the headbox ensures with at least substantially symmetrical headbox nozzle, regardless of changes in the exit slit height constant jet injection conditions. A manual adjustment is not required. It is thus ensured a sufficiently accurate and timely to change the exit slit height or lip opening performed repositioning of the headbox.
  • the lower lip of the headbox nozzle in the region of the outlet gap in a direction parallel to the inside of the lower lip in the exit slit region with respect to the upper lip or aperture at most by an amount which is less than twice the exit slit height measured perpendicular to the inside of the lower lip.
  • it is also in the present case again at least an essentially symmetrical headbox.
  • such a headbox nozzle can be used in which the lower lip does not protrude with respect to the upper lip.
  • the bottom lip and the upper lip of the headbox nozzle can therefore be at least substantially flush in the outlet gap region, for example.
  • the feed and / or discharge device is designed so that the respective predetermined volume flows are fed into or withdrawn from a respective edge column immediately prior to entry into the nozzle space of the headbox nozzle.
  • the headbox for repositioning is at least pivotable.
  • the headbox is preferably pivotable about an axis extending in the transverse direction.
  • the headbox for repositioning can also be translationally displaceable. He is preferably horizontally and / or vertically displaceable.
  • the headbox for repositioning about the axis of a provided after the headbox forming device is pivotable and displaceable in the vertical and / or horizontal direction.
  • the forming device may in this case comprise at least one forming roller or a forming shoe.
  • the board of the lower lip of the headbox nozzle is variably adjustable with respect to the upper lip.
  • the device preferably comprises a particularly electronic control device, via which the repositioning of the headbox in dependence on the exit gap height and / or the ratio of lower lip board I and exit gap height s, if the lower lip board I is variable, automatically controlled and / or regulated.
  • the control device can in particular be connected to a device for measuring the exit slit height, a device for measuring the lower lip board I, a device for detecting the headbox position and an adjusting device for positioning the headbox.
  • a preferred practical embodiment of the device according to the invention is characterized in that the control device calculates a desired position of the headbox based on the measured exit slit height and / or the calculated ratio of lower lip board I and exit slit height s, this target position with the measured actual position the headbox compares and depending on the comparison result optionally outputs a corresponding correction signal to the adjusting device.
  • a respective change in the outlet gap height caused by the change in the Beam launch angle or the StrahlaufSullivanticians at least substantially compensated by a corresponding repositioning of the headbox and / or a corresponding adjustment of the lower lip board.
  • corresponding control circuits can be provided.
  • control device for the automatic control and / or regulation of the fiber orientation transverse profile of the fibrous web is connected to the feed and / or discharge device.
  • the relevant edge-side volume flows can therefore be controlled and / or regulated accordingly to optimize the fiber orientation transverse profile.
  • the control device can expediently be assigned to a process control system.
  • the controller can also find their use in a manual operation.
  • the Indian Fig. 3 The headbox 24 shown comprises a multiple distributor 28 fed with pulp suspension via a transverse distributor 26, a compensation chamber 30, a turbulence generator 32 and an at least substantially symmetrical headbox nozzle 10 which has already been described in connection with FIG Fig. 1 described type for generating a suspension jet 18th
  • the nozzle chamber 12 (see also Fig. 1 ) of the headbox 10 by a lower lip 14 and one of these opposite upper lip or aperture 16 and two mutually opposite side walls 34, 36 limited.
  • the headbox nozzle 10 has an outlet gap 20.
  • the headbox 10 is such that changes in the measured perpendicular to the inside of the lower lip 14 outlet slit height s by an amount of 1 mm, the beam discharge angle ⁇ between the suspension jet 18 and the inside of the lower lip 14 by more than 0.1 ° , It is therefore a headbox 24 with an at least substantially symmetrical headbox 10 with edge feed.
  • the headbox 10 may in particular also be such that the lower lip 14 (see also again Fig. 1 ) in the region of the exit slit 20 in a direction parallel to the inside of the lower lip 14 in the exit slit region X viewed with respect to the upper lip or aperture 16 by a maximum amount I projecting smaller than twice perpendicular to the inside of the lower lip 14 measured exit slit height s.
  • the amount I is referred to in professional circles as the lower lip board.
  • the lower lip 14 and the upper lip 12 of the headbox nozzle 10 can also be at least substantially flush in the outlet gap region, for example.
  • the lower lip board I then becomes "0" in this case.
  • a means 38 for feeding and / or for subtracting a respective predetermined volume flow in or out of the two lateral edge regions 40, 42 of the nozzle chamber 12 is provided.
  • this feed and / or outlet device 38 can be embodied in particular such that the relevant specifiable volume flows are fed into or withdrawn from a respective edge gap immediately before entry into the nozzle chamber 12 of the headbox nozzle 10.
  • the feed and / or discharge device 38 may include lateral supply and / or discharge lines 44, in each of which at least one adjustable valve, in particular control valve, may be used.
  • these lines 44 are connected to the transverse distributor 26.
  • dilution water or the like can be supplied to at least one of the two lateral edge regions.
  • headbox 24 in particular a headbox 10 of the Fig. 1 own type described. It is therefore an at least substantially symmetrical headbox 10.
  • Fig. 4 shows a schematic partial representation of an exemplary embodiment of a device 48 according to the invention for producing a fibrous web, which may be in particular a paper or board web.
  • this device 48 comprises a suspension jet 18 delivering headbox 24 in the Fig. 1 and 3 described type and also also already with reference to the Fig. 3 explained feed-in and / or discharge device 38.
  • this device 48 for influencing the beam launch angle ⁇ (see also FIG Fig. 1 ) between the suspension jet 18th and the inside of the lower lip 14, a device 48 for repositioning the headbox 24 in response to the respective exit slit height s.
  • the feed and / or discharge device 38 (cf. Fig. 3 ) be designed in particular so that the respective predeterminable edge-side volume flows are fed immediately before entry into the nozzle chamber 12 of the headbox 10 in a respective edge column or withdrawn from this.
  • the headbox 24 may be pivotable for repositioning, for example. It may, for example, be pivotable about a transversely extending lower axis 50.
  • the headbox 24 for repositioning may be translationally displaced. In this case, it is preferably at least horizontally and / or vertically displaceable.
  • the suspension jet 18 is introduced into an inlet gap 58 formed between two screens 52, 54 in the region of a forming roller 56.
  • the wire 52 is guided around the forming roller 56 and the wire 54 around a further roller 60.
  • the headbox 24 may, for example, be pivotable about the axis of the forming roller 56 and advantageously additionally displaceable in the vertical and / or horizontal direction.
  • the board I of the lower lip 14 of the headbox 10 with respect to the upper lip or aperture 16 may be variably adjustable.
  • the device 10 also includes a particular electronic control device 62, via which the Nachpositionierung the headbox in dependence on the exit slit height s (see also Fig. 1 ) and / or the ratio of lower lip board I and exit slit height s, if the lower lip board I is variable, is automatically controlled and / or regulated.
  • control device 52 may in particular be connected to a device 64 for measuring the outlet gap height s, a means for measuring the lower lip board I, a device 82 for detecting the headbox position and an adjusting device 68 for positioning the headbox 24.
  • the controller 62 for example, a programmable logic circuit 70 for calculating the desired position of the headbox 24 based on the measured exit slit height s, a comparison circuit 72 for comparing the calculated target position with the measured actual position of the headbox 24 and a controller 74, which optionally outputs a corresponding control value or correction signal to the adjusting device 68 as a function of the result of the comparison.
  • a programmable logic circuit 70 for calculating the desired position of the headbox 24 based on the measured exit slit height s
  • a comparison circuit 72 for comparing the calculated target position with the measured actual position of the headbox 24
  • a controller 74 which optionally outputs a corresponding control value or correction signal to the adjusting device 68 as a function of the result of the comparison.
  • the control device 62 can thus be designed in particular so that it calculates the desired position of the headbox 24 on the basis of the measured exit slit height s and / or the calculated ratio of lower lip board I and exit slit height s, this desired position with the measured actual position of the headbox 24 compares and, depending on the comparison result optionally outputs a corresponding correction signal to the adjusting device 68.
  • the headbox position detection means 66 may comprise, for example, an angle encoder on a drive shaft associated with the actuator 68.
  • the adjusting device 68 comprises z. B. a positioning, the over the controller 62 and the controller 74 can be controlled to compensate for beam launch angle changes.
  • a respective change of the jet launch angle ⁇ or of the jet impact point caused by a change in the exit slit height s can be at least substantially compensated by a corresponding repositioning of the headbox 24 and / or a corresponding readjustment of the lower lip board I.
  • control device 62 may in particular also be connected to the feed and / or discharge device 38.
  • the control device 62 can be assigned to a process control system of the relevant production or paper machine.
  • an at least substantially symmetrical headbox nozzle 10 is combined with a feed and / or take-off device 38 for optimizing the fiber orientation transverse profile.
  • a defined volume flow in the marginal column off or fed whereby cross flows are caused in the nozzle chamber 12 and the fiber orientation is influenced accordingly.
  • the at least substantially symmetrical headbox 10 is combined with a dependent of the exit slit height or lip opening s subsequent positioning of the headbox 24.
  • the setpoint position of the headbox 24 can be calculated via the control device 62 on the basis of the measured outlet slit height s. After a comparison of this desired position with the also detected actual position of the headbox 24, if necessary, a corresponding signal for correcting the headbox position to the particular one positioning drive comprehensive adjusting device 68 are given.
  • this may for example be pivotable about an axis 50.
  • any other variants for repositioning are conceivable.
  • a pivoting movement about the forming roller 56 in combination with a horizontal and / or vertical displacement is possible. It is for example also a correction by a change of the lower lip board I conceivable.
  • the beam launch angle ⁇ can also be significantly influenced. Although this may also affect the leaf structure two-sidedness, the necessary adjustment paths are minimal, so that the influence on the two-sidedness in practice is negligible.
  • a control loop for repositioning the headbox 24 after a change in the gap exit height or lip opening s results, among other things, a control loop for repositioning the headbox 24 after a change in the gap exit height or lip opening s, according to the invention a control engineering coupling between the exit slit height or lip opening s and the positioning of the headbox 24 is possible.

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  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
EP08160074A 2007-07-20 2008-07-10 Dispositif destiné à la fabrication d'une bande de matière fibreuse Withdrawn EP2017383A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710033938 DE102007033938A1 (de) 2007-07-20 2007-07-20 Vorrichtung zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2017383A2 true EP2017383A2 (fr) 2009-01-21
EP2017383A3 EP2017383A3 (fr) 2012-06-13

Family

ID=39865109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08160074A Withdrawn EP2017383A3 (fr) 2007-07-20 2008-07-10 Dispositif destiné à la fabrication d'une bande de matière fibreuse

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EP (1) EP2017383A3 (fr)
DE (1) DE102007033938A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019191832A1 (fr) * 2018-04-05 2019-10-10 Gl&V Canada Inc. Procédé avec un applicateur à jet horizontal pour une extrémité humide de machine à papier

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445564A1 (fr) 1990-02-26 1991-09-11 Mitsubishi Jukogyo Kabushiki Kaisha Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier
EP0353255B1 (fr) 1987-05-14 1992-07-29 Beloit Technologies, Inc. Caisse a pate
DE3538466C2 (de) 1984-10-31 1998-05-28 Valmet Paper Machinery Inc Verfahren zur Steuerung der Strömung eines Stoffauflaufes und Vorrichtung zum Aufbringen von Stoff auf ein Bildungssieb einer Papiermaschine
EP0857816B1 (fr) 1997-01-14 2002-04-03 Metso Paper, Inc. Caisse de tête d'une machine à papier avec alimentation en eau blanche par les côtes latéraux

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029545A1 (de) * 1990-09-18 1992-03-19 Escher Wyss Gmbh Stoffauflauf-einrichtung
DE19845722A1 (de) * 1998-10-05 2000-04-06 Voith Sulzer Papiertech Patent Stoffauflauf
WO2008077585A1 (fr) * 2006-12-22 2008-07-03 Voith Patent Gmbh Arrivée de pâte d'une machine destinée à fabriquer une bande de matière fibreuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538466C2 (de) 1984-10-31 1998-05-28 Valmet Paper Machinery Inc Verfahren zur Steuerung der Strömung eines Stoffauflaufes und Vorrichtung zum Aufbringen von Stoff auf ein Bildungssieb einer Papiermaschine
EP0353255B1 (fr) 1987-05-14 1992-07-29 Beloit Technologies, Inc. Caisse a pate
EP0445564A1 (fr) 1990-02-26 1991-09-11 Mitsubishi Jukogyo Kabushiki Kaisha Procédé de régulation de la direction d'écoulement d'une caisse de tête dans une machine à papier
EP0857816B1 (fr) 1997-01-14 2002-04-03 Metso Paper, Inc. Caisse de tête d'une machine à papier avec alimentation en eau blanche par les côtes latéraux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019191832A1 (fr) * 2018-04-05 2019-10-10 Gl&V Canada Inc. Procédé avec un applicateur à jet horizontal pour une extrémité humide de machine à papier
US10550520B2 (en) 2018-04-05 2020-02-04 Gl&V Canada Inc. Method with a horizontal jet applicator for a paper machine wet end

Also Published As

Publication number Publication date
DE102007033938A1 (de) 2009-01-22
EP2017383A3 (fr) 2012-06-13

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