EP2753751A1 - Pressenpartie einer maschine zur herstellung einer faserstoffbahn - Google Patents
Pressenpartie einer maschine zur herstellung einer faserstoffbahnInfo
- Publication number
- EP2753751A1 EP2753751A1 EP12731453.2A EP12731453A EP2753751A1 EP 2753751 A1 EP2753751 A1 EP 2753751A1 EP 12731453 A EP12731453 A EP 12731453A EP 2753751 A1 EP2753751 A1 EP 2753751A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- web
- press section
- section according
- felt
- 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
- 239000004744 fabric Substances 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims 1
- 229920002678 cellulose Polymers 0.000 abstract 1
- 239000001913 cellulose Substances 0.000 abstract 1
- 230000013011 mating Effects 0.000 abstract 1
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 241000288673 Chiroptera Species 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0272—Wet presses in combination with suction or blowing devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/04—Arrangements thereof
Definitions
- the invention relates to a press section of a machine for producing a fibrous web, in particular a paper, board or pulp web, with at least one press nip formed between a press roll and a counter roll, wherein the fibrous web before the press nip by means of a Abdgingsaugwalze of a preceding Covering can be transferred to an upper press felt and is passed through the press nip between the upper press felt and a lower fabric.
- Such a press section is known for example from the document EP 1072721 A1.
- the upper and lower press felt are moved together shortly after the web has been removed from the forming wire.
- the advantage of this solution is the excellent web guidance, since the web is guided in sandwich between the press felts before the press nip.
- the sandwich can be guided via a steam blow box for moisture cross profile influencing.
- the effect of the steam blow box is diminished by the fact that the steam is applied to the lower press felt and not directly to the fibrous web.
- Another disadvantage of this solution is that the long contact time of the fibrous web with a second wet felt can lead to increased rewetting of the web. The rewet can also take place unevenly across the width, so that additional moisture transverse profile errors arise.
- press sections as known from DE 102004042637 A1, in which the fibrous web is guided hanging on the upper press felt to the press nip and the lower press felt is first performed on the counter roll.
- This arrangement is necessary if a steam blow box is to be installed, which blows directly onto the fibrous web. This is associated with an increased risk that before the press nip web disturbances occur, especially at heavier basis weight of the fibrous web.
- the object of the invention is now to provide a press section, in particular for fibrous webs with a higher basis weight, which has excellent web running properties before the press nip, but nevertheless provides a free surface of the fibrous web, for example, for the effective use of a steam blow box.
- the object is achieved in that after the Ab Spotifysaugwalze a stationary support member with the web-facing side of the upper press felt is in contact, that results in an approximately convex curved web travel for the fibrous web.
- a polygonal shape of the support element which results in approximately a convex track running path.
- the contact surface of the support member may be a continuous curved surface or composed of a plurality of shorter contact surfaces, as they result in a plurality of transverse to the web track arranged support strips composed.
- the approximately convexly curved web run produces a normal force in the direction of press felt, so that the fibrous web follows the press felt without interference, without the lower press fabric having to be added to the sandwich in this area.
- folding away of the edges is prevented, as otherwise often occurs in heavier basis weights.
- the folding down of the edges is particularly critical, since in the case of a complete folding through the multi-folded web in fully loaded press nip large damage to the rollers and the felts can be caused.
- Experiments in the technical center have shown that even a straight web run of 500-1000 mm in length after the intake suction roll can lead to problems with falling edges.
- Heavy or high basis weight fibrous webs have at least 100 g / m 2 , preferably at least 120 g / m 2 , more preferably at least 150 g / m 2 considered.
- the bottom fabric of the press nip may be a press felt, a semi-permeable belt or a water-impermeable transfer belt.
- the preceding string may be, for example, the wire of a sheet forming unit or the lower press sheet of a preceding press nip.
- the straight pieces of the polygon along the web travel are preferably at most 350 mm long, more preferably at most 250 mm long, to achieve a sufficient convex curvature.
- the support element should advantageously be so long that the fibrous web is safely guided until the start of the sandwich area, which is formed by the upper press felt and the lower covering. For example, by the support element until just before the beginning of the sandwich area or slightly beyond.
- This sandwich area can begin at the end of the support element, on a guide roller of the lower clothing or only on the counter-roller of the press nip.
- At least the approximately convexly curved web travel path should extend so far that the distance between the end of the approximately convexly curved web travel path and the beginning of the sandwich region formed by the upper press felt and the lower clothing is between 20 and 500 mm, preferably between 20 and 250 mm, more preferably between 20 and 100 mm.
- the end of the approximately convexly curved web travel path is the last contact line of the support element to the upper press felt.
- the approximately convexly curved web travel path can also protrude into the sandwich area. It should only be avoided that the distance between the guide roller of the lower fabric and the support element is too small, otherwise bugs or shreds, such as those arising during transfer, get stuck and lead to felt burns or other damage.
- the distance between the Surface of the guide roller of the lower clothing and the contact surface of the support element at least 20 mm, preferably at least 40 mm.
- the approximately convexly curved web travel path ends before the beginning of the sandwich region, in order to provide as much space as possible for a steam blower box.
- the first contact surface of the support element to the upper press felt should be in the web running direction at most 350 mm, preferably at most 250 mm from the drain point A of the press felt on the Ab Spotifysaugwalze removed. As a result, a sufficiently rapid effect of the normal force is achieved after leaving the Ab Spotifysaugwalze.
- the support member may comprise individual transverse to the machine direction support strips which are in contact with the press felt and thereby bring this on a polygonal track.
- the support member may also have a continuous curved covering, over which the press felt runs.
- the pad may have holes, grooves or recesses for reducing the contact surface and thus the friction.
- spray pipes or lubrication pockets can be present in front of or in the support element in order to apply water to the side of the press felt facing away from the web.
- the contact surface of the support strips or the covering of the support element is particularly suitable ceramic. Overall, it is advantageous if the distance from the Ab Spotifysaugwalze to the beginning of the sandwich area is as short as possible.
- the approximately convexly curved track running path has a length of more than 200 mm and at most 2000 mm, preferably at most 1300 mm, particularly preferably at most 1000 mm. This ensures adequate stabilization of the fibrous web.
- the support element is designed so that an effective radius of curvature for the approximately convexly curved track run between 150 and 10,000 mm, preferably between 500 and 5000 mm, and more preferably between 750 and 2500 mm.
- the effective radius of curvature can be determined when several points of contact between the support element and press felt are approximated by a circular path. Excessive deflection, ie too small a radius of curvature or "kinks" in the web travel path should be avoided.
- the arrangement according to the invention is particularly suitable for a press section in which the press nip following the support element is the second press nip of the press section and in particular is arranged after a first press nip which is designed as a shoe press nip.
- the second press nip especially after a shoe press nip, drains only relatively little.
- the press felts in the second press nip run drier and the adhesion of the fibrous web to the upper press felt is low.
- the risk of falling edges or web disturbances by Heilverwirbelisme when approaching the lower fabric is therefore particularly high.
- the embodiment according to the invention is also well suited in the event that the support element is arranged in front of the first press nip of the press section, in particular if this is the only press nip of the press section.
- the fibrous web Before the first press nip the fibrous web has only a low dry content, between 16 and 23%, and is therefore still quite heavy. Therefore, especially at higher basis weight, the edges tend to fold.
- it is advantageous not to directly or indirectly to suck the support element and not otherwise act on negative pressure.
- the curved track guide and the normal force generated thereby in most cases sufficient for the stabilization.
- the support element to increase the stabilizing effect and to improve the transfer of the fibrous web may be subjected to negative pressure.
- negative pressure measured on the side of the upper press felt remote from the web in the region of the support element is preferably between 0.5 and 20 kPa, more preferably between 0.5 and 10 kPa and particularly preferably between 1 and 5 kPa.
- a steam blower box which can inflate steam onto the fibrous web, is provided on the side of the upper press felt opposite the support element and / or the suction roll. Due to the very stable web guide on the upper press felt, even under critical boundary conditions, such as with a very high basis weight, the lower clothing can be introduced later, which creates sufficient space for the installation of the steam blow box. At high basis weights, the use of a steam blow box with the press sections according to the prior art is not yet possible. The heating of the fibrous web by the steam blower box is particularly attractive because more water can be squeezed out in the press nip and thus less water must be evaporated in the subsequent drying section.
- Compact steam blow boxes are particularly suitable for the press section according to the invention.
- the box length of the steam blow box in the web running direction should be at most 1000 mm, preferably at most 500 mm, particularly preferably at most 350 mm.
- a good and intensive warming of the fibrous web is achieved if the nozzle openings of the steam blow box, from which the steam flows out, have a diameter between 1 and 10 mm.
- the drives of the press section so that a differential speed between 0.3 and 2%, preferably between 0.5 and 1.5%, can be set from the upper press felt to the preceding clothing ,
- FIG. 2 shows a press section according to the prior art for the production of fibrous webs with lower basis weight
- Figure 3 shows a preferred embodiment of a press section according to the invention with steam blower box
- Figures 1 and 2 show tandem presses according to the prior art.
- Fig.1 shows an embodiment for heavy grades.
- the web travel path on the first and on the second press nip is the same.
- the fibrous web 1 is taken over by means of the Ab Spotifysaugwalze 14,15 on the upper press felt 2,3 of the press nips.
- the lower press felt 5,6 is added, so that the fibrous web 1 is guided in sandwich between the felts for press nip between the shoe press roll 10,11 and the counter roll 12,13.
- the fibrous web 1 is held on the lower press felt 5, 6 by means of the suction felt guide roll 17, 18.
- the fibrous web 1 is always carried by a press felt or guided between two press felts. It is, except directly on the suction roll, never out of the way hanging.
- Figure 2 shows a variant for lighter grades which are not prone to hanging edge problems but are rather critical to rewet by the press felts.
- the lower Pressfliz is 5,6 only on the counter-roller 12,13 added to the fibrous web 1.
- a steam blower box 40 can blow directly onto the fibrous web.
- FIG 3 a preferred embodiment of the press section according to the invention is shown, in which the support element is arranged in front of the second press nip. It should be noted that additionally or alternatively, a corresponding support element may be provided in the upper press felt before the first press nip.
- the fibrous web 1 is held by means of Saugfilzleitwalze 17 on the lower press felt 5 and then taken over by means of Abnniesaugwalze 15 on the upper press felt 3.
- the standing support element 30 is brought into contact with the web-facing side of the upper press felt 3 in such a way that an approximately convexly curved web travel path results for the fibrous web 1.
- the contact surface of the support member 30 may be a continuous curved surface or composed of a plurality of shorter contact surfaces, as they result in a plurality of transverse to the web track arranged support strips composed. Under approximately convex also a polygonal shape of the support member 30 is understood, the approximately one convex web track results. Due to the web tension of the fibrous web 1, a normal force in the direction of press felt 3 is produced by the approximately convexly curved web run, so that the fibrous web 1 follows the press felt 3 without interference, without the lower press cover 6 having to be added to the sandwich in this area.
- the solution according to the invention reliably prevents folding down of the edges which is critical in the case of heavier basis weights and nevertheless provides a sufficiently long free surface of the fibrous web 1, so that a steam blower box 41 can be installed which can apply steam directly to the fibrous web 1.
- the lower press fabric 6 is brought to the sandwich, so that the fibrous web 1 between the two press felts 3 and 6 to the second press nip, which is formed by the shoe roll 1 1 and the backing roll 13.
- the distance from the Ab Spotifysaugwalze 15 to the beginning of the sandwich area is as short as possible.
- the sandwich area should be kept as short as possible, just just as long as Wasserammeiwannen and other necessary elements can be structurally accommodated. Due to the effective use of the steam blow box 41, the dewatering of the fibrous web 1 in the second press nip is significantly improved. Especially with heavy grades, this is necessary to achieve higher production speeds and the required higher dewatering volume.
- the fibrous web 1 is taken over by the Ab Spotifysaugwalze 19 of the preceding fabric 7, which may be a lower press felt or a forming wire on the upper press felt 8.
- the support element 31 has six support strips 34 which predetermine the approximately convexly curved web travel path for the upper press section 8 and the fibrous web 1.
- the support member 31 may be unabsucked or carried out with suction.
- the first contact line C of the support element to the upper press felt follows shortly after the flow point A. In the region of the approximately convexly curved web travel path from C to D, the generated normal force is indicated as arrows.
- FIG. 5 shows a support member 32 which is designed so that there is a short distance from the flow point A to the first contact line C and a short distance from the end D of approximately convexly curved web travel path to the beginning of the sandwich area B.
- a support member 32 Via a seal 33, the support member 32 is connected to the Ab Spotifysaugwalze 19 so that at least no air is drawn into the region of approximately convexly curved web travel path. If the suction box of the Ab Spotifygwalze 19 is positioned accordingly, the support member can be indirectly drawn from the Ab Spotifysaugwalze 19 with.
- FIG. 6 shows in a detail view a further embodiment according to the invention, in which the beginning B of the sandwich area lies before the end D of the approximately convexly curved web travel path. It is important to ensure that the distance between the surface of the guide roller 27 and the press felt 8 contacting parts of the support member 32 is sufficiently large, so that bats or shreds can pass through.
- FIG. 7 shows a detail view of yet another embodiment according to the invention, in which the beginning B of the sandwich area likewise lies before the end D of the approximately convexly curved track running path.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011082161A DE102011082161A1 (de) | 2011-09-06 | 2011-09-06 | Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn |
PCT/EP2012/062892 WO2013034331A1 (de) | 2011-09-06 | 2012-07-03 | Pressenpartie einer maschine zur herstellung einer faserstoffbahn |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2753751A1 true EP2753751A1 (de) | 2014-07-16 |
EP2753751B1 EP2753751B1 (de) | 2016-08-03 |
Family
ID=46456595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12731453.2A Active EP2753751B1 (de) | 2011-09-06 | 2012-07-03 | Pressenpartie einer maschine zur herstellung einer faserstoffbahn |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2753751B1 (de) |
CN (1) | CN103781966B (de) |
DE (1) | DE102011082161A1 (de) |
WO (1) | WO2013034331A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015086294A1 (de) * | 2013-12-13 | 2015-06-18 | Voith Patent Gmbh | Verfahren und maschine zur herstellung von zellstoffplatten |
DE102016201333A1 (de) * | 2016-01-29 | 2017-08-03 | Voith Patent Gmbh | Pressenpartie |
DE102016201338A1 (de) | 2016-01-29 | 2017-08-03 | Voith Patent Gmbh | Presse |
DE102018116125B4 (de) * | 2018-07-04 | 2021-12-30 | Voith Patent Gmbh | Pressenpartie |
DE102022120745A1 (de) | 2022-08-17 | 2023-08-24 | Voith Patent Gmbh | Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1007274B (zh) * | 1985-04-23 | 1990-03-21 | 美商贝洛特公司 | 扩展压榨装置 |
DE19919085A1 (de) * | 1999-04-27 | 2000-11-02 | Voith Sulzer Papiertech Patent | Entwässerungsvorrichtung |
DE19934875A1 (de) | 1999-07-24 | 2001-01-25 | Voith Paper Patent Gmbh | Papiermaschine |
DE19939893A1 (de) * | 1999-08-23 | 2001-03-01 | Voith Paper Patent Gmbh | Pressenanordnung |
DE10109382A1 (de) * | 2001-02-27 | 2002-09-05 | Voith Paper Patent Gmbh | Pressanordnung |
DE102004042637A1 (de) | 2004-09-03 | 2006-03-09 | Voith Paper Patent Gmbh | Pressvorrichtung für eine Papiermaschine |
WO2009065433A1 (de) * | 2007-11-19 | 2009-05-28 | Metso Paper, Inc. | Verfahren und vorrichtung zum überführen einer papierbahn von einem stützgewebe auf ein anderes |
-
2011
- 2011-09-06 DE DE102011082161A patent/DE102011082161A1/de not_active Withdrawn
-
2012
- 2012-07-03 WO PCT/EP2012/062892 patent/WO2013034331A1/de active Application Filing
- 2012-07-03 EP EP12731453.2A patent/EP2753751B1/de active Active
- 2012-07-03 CN CN201280043346.9A patent/CN103781966B/zh active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013034331A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102011082161A1 (de) | 2013-03-07 |
CN103781966A (zh) | 2014-05-07 |
WO2013034331A1 (de) | 2013-03-14 |
CN103781966B (zh) | 2016-04-20 |
EP2753751B1 (de) | 2016-08-03 |
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