EP2630293A1 - Blattbildungseinheit zur herstellung einer materialbahn und verfahren zum betreiben der blattbildungseinheit - Google Patents
Blattbildungseinheit zur herstellung einer materialbahn und verfahren zum betreiben der blattbildungseinheitInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000003595 mist Substances 0.000 claims abstract description 24
- 239000000725 suspension Substances 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000004744 fabric Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
Description
Claims
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 (de) | 2010-10-19 | 2011-09-28 | Blattbildungseinheit zur herstellung einer materialbahn und verfahren zum betreiben der blattbildungseinheit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2630293A1 true EP2630293A1 (de) | 2013-08-28 |
EP2630293B1 EP2630293B1 (de) | 2018-01-10 |
Family
ID=44719935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11761603.7A Active EP2630293B1 (de) | 2010-10-19 | 2011-09-28 | Blattbildungseinheit zur herstellung einer materialbahn und verfahren zum betreiben der blattbildungseinheit |
Country Status (5)
Country | Link |
---|---|
US (2) | US8784614B2 (de) |
EP (1) | EP2630293B1 (de) |
CN (1) | CN103270215B (de) |
DE (1) | DE102010042604A1 (de) |
WO (1) | WO2012052263A1 (de) |
Families Citing this family (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982002910A1 (en) | 1981-02-28 | 1982-09-02 | Zag Heinz | 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 |
-
2010
- 2010-10-19 DE DE201010042604 patent/DE102010042604A1/de not_active Withdrawn
-
2011
- 2011-09-28 CN CN201180061106.7A patent/CN103270215B/zh active Active
- 2011-09-28 EP EP11761603.7A patent/EP2630293B1/de active Active
- 2011-09-28 WO PCT/EP2011/066832 patent/WO2012052263A1/de active Application Filing
-
2013
- 2013-04-17 US US13/864,892 patent/US8784614B2/en active Active
-
2014
- 2014-06-18 US US14/308,698 patent/US9011642B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US9011642B2 (en) | 2015-04-21 |
US20130233502A1 (en) | 2013-09-12 |
DE102010042604A1 (de) | 2012-04-19 |
CN103270215A (zh) | 2013-08-28 |
US8784614B2 (en) | 2014-07-22 |
EP2630293B1 (de) | 2018-01-10 |
WO2012052263A1 (de) | 2012-04-26 |
CN103270215B (zh) | 2016-07-06 |
US20140290885A1 (en) | 2014-10-02 |
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