EP2630293A1 - Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille - Google Patents

Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille

Info

Publication number
EP2630293A1
EP2630293A1 EP11761603.7A EP11761603A EP2630293A1 EP 2630293 A1 EP2630293 A1 EP 2630293A1 EP 11761603 A EP11761603 A EP 11761603A EP 2630293 A1 EP2630293 A1 EP 2630293A1
Authority
EP
European Patent Office
Prior art keywords
loop
forming unit
guide
sheet forming
jet
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
EP11761603.7A
Other languages
German (de)
English (en)
Other versions
EP2630293B1 (fr
Inventor
Christian Schmid
Ulrich FLÜHLER
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 EP2630293A1 publication Critical patent/EP2630293A1/fr
Application granted granted Critical
Publication of EP2630293B1 publication Critical patent/EP2630293B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • D21F1/36—Guiding mechanisms
    • D21F1/40—Rolls
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • Sheet forming unit for producing a material web and method for operating the sheet forming unit
  • the invention relates to a sheet forming unit of a paper machine, in particular a tissue machine, for producing a fibrous web, with a headbox emitting a suspension jet and with a respective inner loop and outer sieve forming a loop.
  • a forming element Within the loop of the inner wire is a forming element and within the loop of the outer wire are guide rollers and a wire pit for receiving the incurred in the region of the forming element white water, arranged.
  • the inner screen and the outer screen form a gap for receiving the suspension jet and at least partially wrap around the forming element in a looping area.
  • the invention relates to a method for operating a sheet forming unit.
  • a sheet forming unit of a paper machine for producing a fibrous web, with a suspension jet emitting headbox and with a respective loop forming inner wire and outer wire, wherein within the loop of the inner wire a forming element and within the loop of the outer wire guide rollers and a Siebwasserkasten for receiving the incurred in the region of the forming element white water, are arranged, wherein the inner wire and the outer wire form a gap for receiving the suspension jet and at least partially wrap around the forming in a Umschlingungs- area.
  • a machine-wide guide element is arranged in the looping area within the loop of the outer screen such that the white water is formed into a jet and directed into the wire pit such that a contact surface between the jet and the loop through the outer screen formed space for receiving water mist arises and / or that in the region of at least one of the guide rollers of the outer screen, a machine-wide guide device is provided outside of the space formed by the loop of the outer screen.
  • a machine-wide guide device is provided outside of the space formed by the loop of the outer screen.
  • both the water mist in the space within the loop of the outer screen and the entrained by the outside of the outer screen water mist can be dissipated.
  • the guide elements are for example made of simple and inexpensive sheets and mounted accordingly. The cost of hoods and blowers is thereby greatly reduced or even avoided.
  • the outer sieve and the inner sieve are designed, for example, as forming sieves.
  • the outer screen is as Formiersieb, preferably with zonal different permeability, and the inner wire out as a felt out.
  • the outer screen may have patterns for forming images and ornaments in the fibrous web.
  • the outer sieve is designed as a forming fabric, preferably with zonal different permeability, and the inner sieve as a structured sieve.
  • Structured sieves are known from the production of voluminous tissue papers, for example in so-called through-air tissue machines.
  • the outer sieve can have patterns which are suitable for producing images and ornaments in the fibrous web.
  • the machine-wide guide element seen in the beam direction, ends before the wire pit. This creates a sufficiently long jet of white water, which in turn allows a sufficiently long contact surface to the space formed by the loop of Aussensiebes to suck by themaschinestrahl bin the water mist from this space to absorb and dissipate.
  • the contact surface is preferably in direct contact with the space formed by the loop of the outer screen.
  • the guide element protrudes into the wire pit only so far that the required contact surface for sucking the water mist is ensured from the space formed by the loop of the outer screen.
  • the length of the opening of the wire pit in a practical case is less than m, preferably less than 0.6m. This avoids that the water mist absorbed by the white water jet due to vortex formation can partially return back into the space formed by the loop of the outer screen.
  • the length of the contact surface, seen in the running direction or in the flow direction of the beam more than 100mm, preferably more than 150mm, in particular more than 200mm.
  • the guide element is designed so that the formed white water jet is not deflected substantially.
  • the forming element preferably has an open surface to promote dewatering of the fibrous web. In some cases, the forming element may be vacuumed.
  • the forming element is formed by a roller.
  • a gap is formed between the guide element and the forming element.
  • the white water emerging from the outer sieve collects in the intermediate space and flows along the guide element in the direction of the white water box.
  • the course of the guide element essentially follows the contour of the forming element.
  • the profile of the guide element is selected so that the intermediate space, viewed in the running direction of the outer screen, has a divergent profile.
  • the course of the guide element is chosen so that the initial distance to the forming element at the beginning of the gap between 10mm and 60 mm, preferably between 20 and 40mm. As a result, a good collection effect is achieved with respect to the emerging white water.
  • the divergence of the gap extends from the initial distance to a distance of greater than 30mm, preferably greater than 40mm, in particular greater than 50mm after a distance corresponding to an angle of about 90 ° of the wrap.
  • the beginning of the guide element is arranged so that the passing through the outer wire white water of the headbox jet is received.
  • the beginning of the guide element is arranged substantially on the imaginary extension of the headbox jet.
  • the Siebwasserkasten on deflection devices for the lateral deflection of the supplied white water and entrained water mist on.
  • the lateral deflection takes place transversely to the direction of the paper machine, preferably to the drive side.
  • the deflection devices consist of bent or preferably bent sheets.
  • each case two adjacent deflecting devices form a channel, that is to say a flow channel for the white water, wherein the spacing of the deflecting devices is so small that the flow vortex extending into the space formed by the loop of the outer sieve is avoided.
  • the deflection devices have surfaces which are inclined relative to one another by a deflection angle, the deflection angle in the flow direction between adjacent surfaces being less than 20 °. This avoids vortexes and backflows.
  • the at least one guide device arranged in the region of the guide rollers of the outer screen outside the space formed by the loop of the outer screen forms in the direction of travel a convergent gap with the outer screen.
  • the boundary layer of water mist entrained by the outer screen is caught in the region of the curvature of the outer screen and returned to the outer screen in the form of a water layer and then removed, for example, via the headbox jet.
  • the gap has an initial height of less than 150 mm, preferably less than 100mm, in particular less than 80 mm and a final height of less than 50 mm, preferably less than 30 mm, in particular less than 10mm.
  • the guide head adjacent to the headbox is associated with a guide device such that the space formed by the guide device and by the outer wire can be sucked by the driving jet effect of the suspension jet.
  • the water mist collecting in this room is discharged through the headbox jet into the white water box.
  • the invention is particularly advantageous to apply at screen speeds of more than 1400m / min, preferably more than 1500m / min, especially at more than 1600m / min.
  • a further aspect of the invention for achieving the object relates to a method for operating a sheet forming unit of a paper machine, in particular a tissue machine, for producing a fibrous web, with a headbox emitting a suspension jet and with an inner sieve and outer sieve each forming a ski, wherein within the loop of the mecanicsiebes a forming element and within the loop of the outer sieve guide rollers and a Siebwasserkasten for receiving the incurred in the region of the forming element white water are arranged, wherein the inner screen and the outer screen form a gap for receiving the suspension jet and the forming element at least partially together wrap around a wrap area.
  • the solution is that the kinetic energy of the suspension jet and / or from the thrown white water and / or the outer screen for the controlled discharge of water mist is used.
  • Figure 1 is a schematic representation of an inventive
  • Embodiment of a sheet forming device in longitudinal section Embodiment of a sheet forming device in longitudinal section
  • FIG. 2 is a schematic representation of the white water box
  • the inner wire 5 wraps around the forming element 7, which is formed by a forming roller, and carries the formed fibrous web 2 to a transfer point for transferring the fibrous web 2 to a subsequent clothing or directly to the next, not shown, process section.
  • This may alternatively or in combination comprise a stand-alone press, a press formed from a press roll and a drying cylinder, a drying, creping and winding device.
  • the outer wire 6 wraps together with the inner wire 5, the forming roller 7 on a wrap 14. This is preferably more than 90 °.
  • the inner wire 5 and the outer wire 6 form an inlet gap for receiving the suspension jet 4 delivered by a headbox 3.
  • the suspension is dewatered in the region of the forming roller 7 and the fibrous web 2 is formed.
  • the drainage takes place mainly through the outer sieve 6.
  • the screened water 13 tangentially emerging through the outer screen 6 is collected by the guide element 15 and deflected so that a white water jet 13 is formed.
  • the beginning of the guide element 15 is located in the region of an imaginary extension of the headbox jet 4, so that the entrained by the outer sieve 6 white water 13 is collected.
  • the starting distance of the guide element 15 to the inside of the outer screen 6 is 30 mm at the beginning of the guide element 15 in this example.
  • the distance after a distance which corresponds approximately to an angle of 90 ° of the wrap, increases to 45 mm, so that there is a divergent gap. Thereafter, the curvature of the guide decreases, whereby the divergence further increases.
  • a screen water box 12 is arranged downstream of the guide element 15, into which the white water jet 13 discharges. It is essential that the guide element is not immersed too deep in the white water box 12, but that a free jet length of the white water jet 13 is ensured to produce a sufficient contact surface at least one side of the white water jet 13 to the space formed by the loop of the outer screen 16.
  • the contact area in this example is more than 150mm.
  • This contact surface generates a suction effect according to the propulsion jet principle, as a result of which the water mist in the space 16 is drawn off and removed together with the white water 13 via the white water box 12.
  • the cross section of the white water container for receiving the white water 13 is dimensioned such that no vortex formation is possible.
  • the length of the opening of the white water box 12 is in this practical case, preferably less than 0.6m. This avoids that the water mist absorbed by the white water jet due to vortex formation can partially return back into the space formed by the loop of the outer screen.
  • the pickled white water 13 with water mist is deflected within the white water box 12 to the side, preferably to the drive side, and removed.
  • the deflection takes place by deflecting devices 24, which are installed in the wire pit 12. Adjacent deflection devices 24 each form a flow channel.
  • the outer sieve 6 is separated from the inner sieve 5, the formed fibrous web 2 being led away together with the inner sieve 5.
  • the Outer sieve 6 is returned via guide rollers 8, 9, 10, 1 1 back to forming element 7.
  • a white water boat 23 is provided for receiving Siebwassers and water mist entrained by the outer sieve 6 in the fabric and on its surface.
  • the white water ship 23 surrounds the lower part of the loop of the outer sieve 6, whereby this part is encapsulated.
  • the dragged on the Siebober configuration with liquid is stripped by curved guide devices 19, 20, 21, 22 wirbelarm, deflected and fed to the white water ship 23.
  • 1 1 guide devices 17, 18 are arranged outside of the space formed by the loop of the outer screen 6.
  • the gap has an initial height of less than 00mm and a final height of less than 30mm.
  • the gap in front of the head box 3 is sucked through the headbox jet 4 by the propulsion jet principle and thus the water mist entrained by the outer sieve 6 is removed via the forming area into the white water box 12.
  • the forming roller 7 has a closed jacket. The drainage is thus carried out exclusively by the outer sieve.
  • FIG. 2 shows a schematic representation of the white water box 12 of Figure 1 in cross section.
  • the white water box 12 is machine-wide executed.
  • the white water jet 13 flows from above into the opening of the white water box 12.
  • deflection devices 24 are provided, wherein two adjacent deflection devices 24 form a channel, that is, a flow channel for the white water 13, wherein the distance of Umlenkvor-directions 24th is so small that the training of in the space formed by the loop of Aussensiebes inside extending flow vortex is avoided.
  • the deflecting devices 24 have surfaces which are inclined relative to one another by a deflection angle, the deflection angle in the flow direction between adjacent surfaces being less than 20 °. This avoids vortexes and backflows.
  • the screen water is returned to the drive side of the paper machine via the lateral white water removal 25 in the manufacturing process.
  • the lateral sieve-water discharge 25 can be directly drained via a vacuum device or via a downpipe. This allows the discharge capacity to be adapted to the amount of white water.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne une unité de formation de feuille (1) d'une machine à papier, en particulier d'une machine à papier mousseline, pour la fabrication d'une bande de matière fibreuse (2), comprenant une caisse de tête (3) fournissant un jet de suspension (4) et une toile intérieure (5) et une toile extérieure (6) formant chacune une boucle, un élément de formage (7) étant disposé à l'intérieur de la boucle de la toile intérieure (5) et des rouleaux guides (8, 9, 10, 11) et un cuvier d'eaux blanches (12) pour recevoir les eaux blanches (13) dans la région de l'élément de formage (7) étant disposés à l'intérieur de la boucle de la toile extérieure (6), la toile intérieure (5) et la toile extérieure (6) formant une fente pour recevoir le jet de suspension (4) et entourant au moins en partie conjointement l'élément de formage (7) dans une région d'enroulement (14). L'unité de formation de feuille (1) selon l'invention est caractérisée en ce qu'un élément guide (15) est disposé dans la région d'enroulement (14) à l'intérieur de la boucle de la toile extérieure (6) de telle manière que les eaux blanches (13) forment un jet et soient déviées dans le cuvier d'eaux blanches (12) de telle manière qu'une surface de contact se forme entre le jet et l'espace (16) formé par la boucle de la toile extérieure (6) pour recevoir le brouillard d'eau et/ou en ce qu'un dispositif guide (17, 18) de la largeur de la machine est disposé dans la région d'au moins un des rouleaux guides (8, 9, 10, 11) de la toile extérieure (6) en dehors de l'espace (16) formé par la boucle de la toile extérieure (6).
EP11761603.7A 2010-10-19 2011-09-28 Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille Active EP2630293B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010042604 DE102010042604A1 (de) 2010-10-19 2010-10-19 Blattbildungseinheit zur Herstellung einer Materialbahn und Verfahren zum Betreiben der Blattbildungseinheit
PCT/EP2011/066832 WO2012052263A1 (fr) 2010-10-19 2011-09-28 Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille

Publications (2)

Publication Number Publication Date
EP2630293A1 true EP2630293A1 (fr) 2013-08-28
EP2630293B1 EP2630293B1 (fr) 2018-01-10

Family

ID=44719935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11761603.7A Active EP2630293B1 (fr) 2010-10-19 2011-09-28 Unité de formation de feuille pour fabriquer une bande de matériau et procédé pour faire fonctionner l'unité de formation de feuille

Country Status (5)

Country Link
US (2) US8784614B2 (fr)
EP (1) EP2630293B1 (fr)
CN (1) CN103270215B (fr)
DE (1) DE102010042604A1 (fr)
WO (1) WO2012052263A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014102610A1 (de) * 2014-02-27 2015-08-27 Windmöller & Hölscher Kg Absaugkanal für eine Absaugvorrichtung zur Förderung von geschnittenen Abfallstreifen einer Folienbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3261499D1 (en) 1981-02-28 1985-01-24 Voith Gmbh J M Device for continuously dehydrating a fiber web
DE3910892A1 (de) * 1989-04-04 1990-10-11 Escher Wyss Gmbh Doppelsiebformer
US5225043A (en) * 1989-04-04 1993-07-06 Sulzer-Escher Wyss Gmbh Twin wire former with water guide element over the forming zone
US6231723B1 (en) * 1999-06-02 2001-05-15 Beloit Technologies, Inc Papermaking machine for forming tissue employing an air press
DE10232125A1 (de) * 2002-07-16 2004-02-05 Voith Paper Patent Gmbh Siebpartie zur Herstellung einer mehrlagigen Faserstoffbahn
DE10255908A1 (de) * 2002-11-29 2004-07-08 Voith Paper Patent Gmbh Doppelsiebformer
DE102009002567A1 (de) * 2009-04-22 2010-10-28 Voith Patent Gmbh Vorrichtung zum Abführen von Schleuderwasser an einem Umlenkpunkt

Also Published As

Publication number Publication date
EP2630293B1 (fr) 2018-01-10
US20140290885A1 (en) 2014-10-02
US8784614B2 (en) 2014-07-22
US20130233502A1 (en) 2013-09-12
US9011642B2 (en) 2015-04-21
CN103270215A (zh) 2013-08-28
DE102010042604A1 (de) 2012-04-19
CN103270215B (zh) 2016-07-06
WO2012052263A1 (fr) 2012-04-26

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