EP2753751B1 - Pressing section of a machine for producing a fibrous web - Google Patents

Pressing section of a machine for producing a fibrous web Download PDF

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Publication number
EP2753751B1
EP2753751B1 EP12731453.2A EP12731453A EP2753751B1 EP 2753751 B1 EP2753751 B1 EP 2753751B1 EP 12731453 A EP12731453 A EP 12731453A EP 2753751 B1 EP2753751 B1 EP 2753751B1
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EP
European Patent Office
Prior art keywords
pressing section
web
press felt
section according
upper press
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EP12731453.2A
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German (de)
French (fr)
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EP2753751A1 (en
Inventor
Daniel Gronych
Christoph Lapp
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2753751A1 publication Critical patent/EP2753751A1/en
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    • 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 guided by the press nip between the upper press felt and a lower fabric according to the preamble of claim 1.
  • a press section is for example off DE-A-101 09 382 known.
  • 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 such as from DE 102004042637 A1 known, in which the fibrous web is guided hanging on the upper press felt to the press nip and the lower press felt is added to 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. Often causes the leading of the lower clothing caused by the resulting air flow disturbances in the web and in particular flutter or lifting the edges. By the normal force generated by the support element these problems are reliably avoided.
  • 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 clothing 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.
  • 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. An excessive deflection, ie too small a radius of curvature or "kink" in the web travel path should be avoided.
  • the support member per meter length of the approximately convexly curved web travel path at least four transverse to the machine direction support strips, with the upper Press felt come into contact. It is likewise advantageous if the support element has four to fifteen, preferably four to ten, cross-machine direction support strips that come into contact with the upper press felt.
  • 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.
  • 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.
  • Fig.1 and Fig.2 show tandem presses according to the prior art.
  • Fig.1 shows a version for heavy varieties.
  • 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-roller 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.
  • Fig.2 shows a variant for lighter grades, which are not prone to problems with drooping edges, but are rather critical with respect to rewetting 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 formed by the shoe roll 11 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.
  • FIG 4 shows a detail of a preferred embodiment of the support element.
  • 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 drain point A to the first contact line C and a short distance from the end D of the approximately convexly curved Bahnlaufweges 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 Spotifygwalze 19 with.
  • Figure 6 represents in a detailed view of another embodiment of the invention in which the beginning B of the sandwich area is located in front of 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 a detail view of yet another embodiment of the invention is shown, in which also the beginning B of the sandwich area before the end D of the approximately convex curved web travel path.

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Description

Die Erfindung betrifft eine Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Papier-, Karton- oder Zellstoffbahn, mit wenigstens einem Pressnip, der zwischen einer Presswalze und einer Gegenwalze gebildet wird, wobei die Faserstoffbahn vor dem Pressnip mit Hilfe einer Abnahmesaugwalze von einer vorangehenden Bespannung auf einen oberen Pressfilz überführbar ist und durch den Pressnip zwischen dem oberen Pressfilz und einer unteren Bespannung geführt wird nach dem Oberbegriff des Anspruchs 1. Eine derartige Pressenpartie ist beispielweise aus DE-A-101 09 382 bekannt.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 Abnahmesaugwalze of a preceding Covering can be transferred to an upper press felt and is guided by the press nip between the upper press felt and a lower fabric according to the preamble of claim 1. Such a press section is for example off DE-A-101 09 382 known.

Bekannt ist eine solche Pressenpartie beispielsweise aus der Druckschrift EP 1072721 A1 . In der dort beschriebenen Single-Presse werden der obere und der untere Pressfilz zusammengefahren, kurz nachdem die Bahn vom Formersieb abgenommen wurde. Der Vorteil dieser Lösung ist die hervorragende Bahnführung, da die Bahn vor dem Pressnip im Sandwich zwischen den Pressfilzen geführt wird. Das Sandwich kann über einen Dampfblaskasten zur Feuchtequerprofil-Beeinflussung geführt werden. Die Wirkung des Dampfblaskastens wird allerdings geschmälert dadurch, dass der Dampf auf den unteren Pressfilz und nicht direkt auf die Faserstoffbahn aufgebracht wird. Ein weiterer Nachteil dieser Lösung ist, dass die lange Kontaktzeit der Faserstoffbahn mit einem zweiten feuchten Filz zu erhöhter Rückfeuchtung der Bahn führen kann. Die Rückfeuchtung kann auch ungleichmäßig über der Breite stattfinden, so dass zusätzliche Feuchtequerprofilfehler entstehen.Such a press section is known for example from the document EP 1072721 A1 , In the single press described there, 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. However, 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.

Weiterhin gibt es auch Pressenpartien, wie aus DE 102004042637 A1 bekannt, bei denen die Faserstoffbahn hängend am oberen Pressfilz zum Pressnip geführt wird und der untere Pressfilz erst auf der Gegenwalze dazugeführt wird. Diese Anordnung ist notwendig, wenn ein Dampfblaskasten eingebaut werden soll, der direkt auf die Faserstoffbahn bläst. Damit verbunden ist ein erhöhtes Risiko, dass vor dem Pressnip Bahnlaufstörungen auftreten, insbesondere bei schwererem Flächengewicht der Faserstoffbahn.Furthermore, there are also press sections, such as from DE 102004042637 A1 known, in which the fibrous web is guided hanging on the upper press felt to the press nip and the lower press felt is added to 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.

Die Aufgabe der Erfindung ist es nun, eine Pressenpartie, insbesondere für Faserstoffbahnen mit höherem Flächengewicht zu schaffen, die hervorragende Bahnlaufeigenschaften vor dem Pressnip aufweist, aber trotzdem eine freie Oberfläche der Faserstoffbahn beispielsweise für den effektiven Einsatz eines Dampfblaskastens bietet.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.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass nach der Abnahmesaugwalze ein stehendes Stützelement mit der bahnabgewandten Seite des oberen Pressfilzes so in Kontakt ist, dass sich für die Faserstoffbahn ein annähernd konvex gekrümmter Bahnlaufweg ergibt. Unter annähernd konvex wird auch eine polygone Form des Stützelements verstanden, die annähernd einen konvexen Bahnlaufweg ergibt. Die Kontaktfläche des Stützelements kann eine durchgehend gekrümmt Fläche sein oder sich aus mehreren kürzeren Kontaktflächen, wie sie sich bei mehreren quer zum Bahnlaufweg angeordneten Stützleisten ergeben, zusammengesetzt sein. Durch den annähernd konvex gekrümmten Bahnlauf wird aufgrund der Bahnspannung der Faserstoffbahn eine Normalkraft in Richtung Pressfilz erzeugt, so dass die Faserstoffbahn störungsfrei dem Pressfilz folgt, ohne dass die untere Pressenbespannung in diesem Bereich zum Sandwich dazugeführt werden muss. Durch die erfindungsgemäße Lösung wird ein Abklappen der Ränder verhindert, wie es bei schwereren Flächengewichten ansonsten häufig auftritt. Das Abklappen der Ränder ist besonders kritisch, da im Falle eines vollständigen Umklappens durch die mehrfach gefaltete Bahn im voll belasteten Pressnip große Schäden an den Walzen und den Filzen verursacht werden können. Versuche im Technikum haben gezeigt, dass bereits ein gerader Bahnlauf von 500 - 1000 mm Länge nach der Abnahmesaugwalze zu Problemen mit herab fallenden Rändern führen kann. Oftmals verursacht auch das Heranführen der unteren Bespannung durch die entstehende Luftströmung Störungen im Bahnlauf und insbesondere Flattern oder Abheben der Ränder. Durch die vom Stützelement erzeugte Normalkraft werden diese Probleme zuverlässig vermieden.The object is achieved in that after the Abnahmesaugwalze 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. Under approximately convex is also understood 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. Because of the web tension of the fibrous web, 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. By the solution according to the invention, 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. Often causes the leading of the lower clothing caused by the resulting air flow disturbances in the web and in particular flutter or lifting the edges. By the normal force generated by the support element these problems are reliably avoided.

Faserstoffbahnen mit schwerem oder hohem Flächengewicht haben mindestens 100 g/m2, bevorzugt mindestens 120 g/m2, besonders bevorzugt mindestens 150 g/m2 betrachtet.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.

Die untere Bespannung des Pressnips kann ein Pressfilz, ein semi-permeables Band oder ein wasserundurchlässiges Transferband sein. Die vorangehende Bespannung kann beispielsweise das Sieb einer Blattbildungseinheit oder der untere Pressfliz eines vorangehenden Pressnips sein.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.

Die geraden Stücke des Polygons entlang des Bahnlaufweges sind bevorzugt höchstens 350 mm lang, besonders bevorzugt höchstens 250 mm lang, um eine ausreichende konvexe Krümmung zu erzielen.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.

Das Stützelement sollte vorteilhafterweise so lang sein, dass die Faserstoffbahn bis zum Beginn des Sandwichbereiches, der vom oberen Pressfilz und der unteren Bespannung gebildet wird, sicher geführt ist. Beispielsweise indem das Stützelement bis kurz vor den Beginn des Sandwichbereiches oder etwas darüber hinaus reicht. Dieser Sandwichbereich kann am Ende des Stützelements, auf einer Leitwalze der unteren Bespannung oder auch erst auf der Gegenwalze des Pressnips beginnen. Zumindest sollte sich der annähernd konvex gekrümmte Bahnlaufweg soweit erstrecken, dass der Abstand zwischen dem Ende des annähernd konvex gekrümmten Bahnlaufweges und dem Beginn des Sandwichbereiches, der vom oberen Pressfilz und der unteren Bespannung gebildet wird, zwischen 20 und 500 mm, bevorzugt zwischen 20 und 250 mm, besonders bevorzugt zwischen 20 und 100 mm beträgt. Das Ende des annähernd konvex gekrümmten Bahnlaufweges ist die letzte Kontaktlinie des Stützelementes zum oberen Pressfilz. Selbstverständlich kann sich der annähernd konvex gekrümmte Bahnlaufweg auch in den Sandwichbereich hineinragen. Es sollte nur vermieden werden, dass der Abstand zwischen der Leitwalze der unteren Bespannung und dem Stützelements zu klein ist, da sonst Batzen oder Fetzen, wie sie beim Überführen entstehen, steckenbleiben und zu Filzverbrennungen oder anderen Beschädigungen führen. Bevorzugt ist der Abstand zwischen der Oberfläche der Leitwalze der unteren Bespannung und der Kontaktfläche des Stützelements mindestens 20 mm, bevorzugt mindestens 40 mm.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. Of course, 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 clothing 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. Preferably, 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.

Es ist aber bevorzugt, dass der annähernd konvex gekrümmte Bahnlaufweg vor Beginn des Sandwichbereiches endet, um möglichst Platz für einen Dampfblaskasten zu bieten.However, it is preferred that 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.

Die erste Kontaktfläche des Stützelements zum oberen Pressfilz sollte in Bahnlaufrichtung höchstens 350 mm, bevorzugt höchstens 250 mm vom Ablaufpunkt A des Pressfilzes an der Abnahmesaugwalze entfernt sein. Dadurch wird ein ausreichend schnelle Wirkung der Normalkraft nach dem Verlassen der Abnahmesaugwalze erreicht.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 Abnahmesaugwalze removed. As a result, a sufficiently rapid effect of the normal force is achieved after leaving the Abnahmesaugwalze.

Das Stützelement kann einzelne quer zur Maschinenrichtung angeordnete Stützleisten aufweisen, die in Kontakt mit dem Pressfilz sind und diesen dadurch auf eine polygonförmige Bahn bringen. Das Stützelement kann auch einen durchgängig gekrümmten Belag besitzen, über den der Pressfilz läuft. Der Belag kann Löcher, Rillen oder Aussparungen zur Reduzierung der Kontaktfläche und damit der Reibung aufweisen. Zur Schmierung können Spritzrohre oder Schmiertaschen vor dem oder im Stützelement vorhanden sein, um Wasser auf die bahnabgewandte Seite des Pressfilzes aufzutragen. Als Material für die Stützleisten, die Kontaktfläche der Stützleisten oder den Belag des Stützelementes eignet sich besonders Keramik.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. For lubrication, 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. As a material for the support strips, the contact surface of the support strips or the covering of the support element is particularly suitable ceramic.

Insgesamt ist es vorteilhaft, wenn die Strecke von der Abnahmesaugwalze bis zum Beginn des Sandwichbereiches möglichst kurz ist. In einer bevorzugten Ausführungsform hat der annähernd konvex gekrümmte Bahnlaufweg eine Länge von mehr als 200 mm und höchstens 2000 mm, bevorzugt höchstens 1300 mm, besonders bevorzugt höchstens 1000 mm aufweist. Dadurch ist eine ausreichende Stabilisierung der Faserstoffbahn gewährleistet.Overall, it is advantageous if the distance from the Abnahmesaugwalze to the beginning of the sandwich area is as short as possible. In a preferred embodiment, 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.

Weiterhin ist es vorteilhaft, wenn das Stützelement so gestaltet ist, dass sich für den annähernd konvex gekrümmten Bahnlaufweg ein effektiver Krümmungsradius zwischen 150 und 10 000 mm, bevorzugt zwischen 500 und 5000 mm und besonders bevorzugt zwischen 750 und 2500 mm ergibt. Der effektive Krümmungsradius lässt sich ermitteln, wenn mehrere Berührungspunkte zwischen Stützelement und Pressfilz mit einer Kreisbahn angenähert werden. Eine zu starke Umlenkung, d.h. ein zu kleiner Krümmungsradius oder "knicke" im Bahnlaufweg sollten vermieden werden.Furthermore, it is advantageous if 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. An excessive deflection, ie too small a radius of curvature or "kink" in the web travel path should be avoided.

Um einen guten Kompromiss zwischen Stützung der Bahn, Länge der gestützten Fläche und Minimierung der Reibung und des Filzverschleißes zu erreichen, ist es vorteilhaft, wenn das Stützelement pro Meter Länge des annähernd konvex gekrümmten Bahnlaufweges mindestens vier quer zur Maschinenlaufrichtung angeordnete Stützleisten, die mit dem oberen Pressfilz in Kontakt kommen, aufweist. Ebenso ist es vorteilhaft, wenn das Stützelement vier bis fünfzehn, bevorzugt vier bis zehn quer zur Maschinenlaufrichtung angeordnete Stützleisten, die mit dem oberen Pressfilz in Kontakt kommen, aufweist.In order to achieve a good compromise between support of the web, length of the supported surface and minimization of friction and felt wear, it is advantageous if the support member per meter length of the approximately convexly curved web travel path at least four transverse to the machine direction support strips, with the upper Press felt come into contact. It is likewise advantageous if the support element has four to fifteen, preferably four to ten, cross-machine direction support strips that come into contact with the upper press felt.

Besonders geeignet ist die erfindungsgemäße Anordnung für eine Pressenpartie, bei der der nach dem Stützelement folgende Pressnip der zweite Pressnip der Pressenpartie ist und insbesondere nach einem ersten Pressnip, der als Schuhpressnip ausgeführt ist, angeordnet ist. Der zweite Pressnip, vor allem nach einem Schuhpressnip, entwässert nur noch relativ wenig. Dadurch laufen die Pressfilze im zweiten Pressnip trockener und die Haftung der Faserstoffbahn am oberen Pressfilz ist gering. Die Gefahr von abklappenden Rändern oder Bahnstörungen durch Luftverwirbelungen beim Heranführen der unteren Bespannung ist deshalb besonders hoch.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. As a result, 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 Luftverwirbelungen when approaching the lower fabric is therefore particularly high.

Andererseits ist die erfindungsgemäße Ausführung auch gut geeignet, im Falle dass das Stützelement vor dem ersten Pressnip der Pressenpartie angeordnet ist, insbesondere wenn dies der einzige Pressnip der Pressenpartie ist. Vor dem ersten Pressnip hat die Faserstoffbahn nur einen geringen Trockengehalt, zwischen 16 und 23%, und ist deshalb noch recht schwer. Besonders bei höherem Flächengewicht neigen die Ränder deshalb zum Abklappen.On the other hand, 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. 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.

Um die Reibung möglichst gering zu halten und um den Energieverbrauch der Pressenpartie und der Antriebe zu reduzieren ist es von Vorteil, das Stützelement weder direkt noch indirekt zu besaugen und auch nicht anders mit Unterdruck zu beaufschlagen. Die gekrümmte Bahnführung und die dadurch erzeugte Normalkraft reicht in den meisten Fällen für die Stabilisierung aus.In order to keep the friction as low as possible and to reduce the energy consumption of the press section and the drives, 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.

Alternativ kann das Stützelement zur Erhöhung der Stabilisierungswirkung und zur Verbesserung des Überführens der Faserstoffbahn mit Unterdruck beaufschlagt sein. Beispielsweise indem es direkt mit einer Absaugung verbunden ist oder indirekt von der Abnahmesaugwalze besaugt wird oder indem am Stützelement über eine entsprechende mit Druckluft versorgte Foildüse ein Absaugeffekt erzeugt wird. Wird das Stützelement von der Abnahmesaugwalze mit besaugt, muss der Zwischenraum über entsprechende Seitenschilde und quer zur Bahnlaufrichtung verlaufende Dichtklingen abgedichtet sein. Der auf der bahnabgewandten Seite des oberen Pressfilzes im Bereich des Stützelementes gemessene Unterdruck liegt bevorzugt zwischen 0,5 und 20 kPa, besonders bevorzugt zwischen 0,5 und 10 kPa und besonders bevorzugt zwischen 1 und 5 kPa. Somit wird die Stabilisierung verbessert, ohne dass zuviel Reibung und Verschleiß entsteht.Alternatively, the support element to increase the stabilizing effect and to improve the transfer of the fibrous web may be subjected to negative pressure. For example, by being directly connected to an exhaust or being indirectly sucked by the Abnahmesaugwalze or by a suction effect is generated on the support element via a corresponding supplied with compressed air nozzle. If the support element is sucked by the removal suction roll, the intermediate space must be sealed by way of corresponding side shields and sealing blades running transversely to the direction of web travel. The 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. Thus, the stabilization is improved without causing too much friction and wear.

In einer ganz besonders bevorzugten Ausführung ist auf der dem Stützelement und/oder der Absaugwalze gegenüberliegenden Seite des oberen Pressfilzes ein Dampfblaskasten, der Dampf auf die Faserstoffbahn aufblasen kann, vorgesehen. Durch die sehr stabile Bahnführung am oberen Pressfilz auch bei kritischen Randbedingungen, wie etwa bei sehr hohem Flächengewicht, kann die untere Bespannung später herangeführt werden, was ausreichend Platz für die Installation des Dampfblaskastens schafft. Bei hohen Flächengewichten ist der Einsatz eines Dampfblaskastens mit den Pressenpartien nach dem Stand der Technik bisher nicht möglich. Die Erwärmung der Faserstoffbahn durch den Dampfblaskasten ist besonders attraktiv, da mehr Wasser im Pressnip ausgepresst werden kann und somit weniger Wasser in der nachfolgenden Trockenpartie verdampft werden muss.In a very particularly preferred embodiment, 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.

Für die erfindungsgemäße Pressenpartie sind kompakte Dampfblaskästen besonders geeignet. Die Kastenlänge des Dampfblaskastens in Bahnlaufrichtung sollte höchstens 1000 mm, bevorzugt höchstens 500 mm, besonders bevorzugt höchstens 350 mm betragen.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.

Eine gute und intensive Aufwärmung der Faserstoffbahn wird erreicht, wenn die Düsenöffnungen des Dampfblaskastens, aus denen der Dampf ausströmt, einen Durchmesser zwischen 1 und 10 mm aufweisen.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.

Um eine ausreichende Bahnspannung in der Faserstoffbahn zu erzeugen, ist es hilfreich, die Antriebe der Pressenpartie so auszuführen, dass eine Differenzgeschwindigkeit zwischen 0,3 und 2 %, bevorzugt zwischen 0,5 und 1,5 % vom oberen Pressfilz zur vorangehenden Bespannung einstellbar ist.In order to produce a sufficient web tension in the fibrous web, it is helpful to design the drives of the press section such that a differential speed of between 0.3 and 2%, preferably between 0.5 and 1.5%, of the upper press felt can be set to the preceding clothing ,

Anhand von Ausführungsbeispielen werden weitere vorteilhafte Merkmale der Erfindung erläutert unter Bezugnahme auf die Zeichnungen. Sie zeigen

in Fig.1
eine Pressenpartie nach dem Stand der Technik für die Herstellung von Faserstoffbahnen mit höherem Flächengewicht
in Fig.2
eine Pressenpartie nach dem Stand der Technik für die Herstellung von Faserstoffbahnen mit niedrigerem Flächengewicht
in Fig.3
eine bevorzugte Ausführung einer erfindungsgemäßen Pressenpartie mit Dampfblaskasten
in Fig.4
eine Detailansicht einer weiteren bevorzugten Ausführung
in Fig.5
eine weitere Detailansicht einer weiteren bevorzugten Ausführung
in Fig.6
eine Detailansicht noch einer bevorzugten Ausführung
in Fig.7
eine Detailansicht noch einer bevorzugten Ausführung
By way of embodiments , further advantageous features of the invention will be explained with reference to the drawings. they show
in Fig.1
a press section of the prior art for the production of fibrous webs with a higher basis weight
in Fig.2
a prior art press section for the production of lower basis weight fibrous webs
in Fig.3
a preferred embodiment of a press section according to the invention with steam blower box
in Fig.4
a detailed view of another preferred embodiment
in Fig.5
a further detailed view of another preferred embodiment
in Fig.6
a detailed view of a still preferred embodiment
in Fig.7
a detailed view of a still preferred embodiment

Nachfolgend werden die Figuren detaillierter beschrieben.The figures are described in more detail below.

Fig.1 und Fig.2 zeigen Tandem-Pressen nach dem Stand der Technik. Fig.1 and Fig.2 show tandem presses according to the prior art.

Fig.1 zeigt eine Ausführung für schwere Sorten. Der Bahnlaufweg am ersten und am zweiten Pressnip ist gleich ausgeführt. Die Faserstoffbahn 1 wird mit Hilfe der Abnahmesaugwalze 14,15 auf den oberen Pressfilz 2,3 des Pressnips übernommen. Direkt danach wird der untere Pressfilz 5,6 dazugeführt, so dass die Faserstoffbahn 1 im Sandwich zwischen den Filzen zum Pressnip zwischen der Schuhpresswalze 10,11 und der Gegenwalze 12,13 geführt wird. Nach dem Pressnip wird die Faserstoffbahn 1 mit Hilfe der Saugfilzleitwalze 17,18 auf dem unteren Pressfilz 5,6 gehalten. Die Faserstoffbahn 1 wird immer von einem Pressfilz getragen oder zwischen zwei Pressfilzen geführt. Sie wird, außer direkt auf der Saugwalze, nie über Kopf hängend geführt. Fig.1 shows a version for heavy varieties. 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 Abnahmesaugwalze 14,15 on the upper press felt 2,3 of the press nips. Immediately thereafter, 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-roller 12,13. After the press nip, 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.

Fig.2 zeigt eine Variante für leichtere Sorten, die nicht zu Problemen mit hängenden Rändern neigen, aber eher kritisch bezüglich Rückfeuchtung durch die Pressfilze sind. Hierbei wird der untere Pressfliz 5,6 erst auf der Gegenwalze 12,13 zur Faserstoffbahn 1 dazugeführt. Zur Erhöhung der Bahntemperatur oder zur Korrektur des Feuchtequerprofils kann ein Dampfblaskasten 40 direkt auf die Faserstoffbahn blasen. Fig.2 shows a variant for lighter grades, which are not prone to problems with drooping edges, but are rather critical with respect to rewetting by the press felts. Here, the lower Pressfliz is 5,6 only on the counter-roller 12,13 added to the fibrous web 1. To increase the web temperature or to correct the moisture cross profile, a steam blower box 40 can blow directly onto the fibrous web.

In Fig.3 ist eine bevorzugte Ausführung der erfindungsgemäßen Pressenpartie dargestellt, bei der das Stützelement vor dem zweiten Pressnip angeordnet ist. Es wird darauf hingewiesen, dass zusätzlich oder alternativ auch vor dem ersten Pressnip ein entsprechendes Stützelement im oberen Pressfilz vorgesehen sein kann. Nach dem ersten Pressnip, der von der Schuhpresswalze 10 und der Gegenwalze 12 gebildet wird, wird die Faserstoffbahn 1 mit Hilfe der Saugfilzleitwalze 17 auf dem unteren Pressfilz 5 gehalten und dann mit Hilfe der Abnahmesaugwalze 15 auf den oberen Pressfilz 3 übernommen. Das stehende Stützelement 30 wird mit der bahnabgewandten Seite des oberen Pressfilzes 3 so in Kontakt gebracht, dass sich für die Faserstoffbahn 1 ein annähernd konvex gekrümmter Bahnlaufweg ergibt. Die Kontaktfläche des Stützelements 30 kann eine durchgehend gekrümmt Fläche sein oder sich aus mehreren kürzeren Kontaktflächen, wie sie sich bei mehreren quer zum Bahnlaufweg angeordneten Stützleisten ergeben, zusammengesetzt sein. Unter annähernd konvex wird auch eine polygone Form des Stützelements 30 verstanden, die annähernd einen konvexen Bahnlaufweg ergibt. Durch den annähernd konvex gekrümmten Bahnlauf wird aufgrund der Bahnspannung der Faserstoffbahn 1 eine Normalkraft in Richtung Pressfilz 3 erzeugt, so dass die Faserstoffbahn 1 störungsfrei dem Pressfilz 3 folgt, ohne dass die untere Pressenbespannung 6 in diesem Bereich zum Sandwich dazugeführt werden muss. Durch die erfindungsgemäße Lösung wird das bei schwereren Flächengewichten kritische Abklappen der Ränder zuverlässig verhindert und trotzdem eine ausreichend lange freie Oberfläche der Faserstoffbahn 1 geschaffen, so dass ein Dampfblaskasten 41 installiert werden kann, der direkt auf die Faserstoffbahn 1 Dampf auftragen kann. Am Ende des gekrümmten Bahnlaufweges wird die untere Pressenbespannung 6 zum Sandwich herangeführt, so dass die Faserstoffbahn 1 zwischen den zwei Pressfilzen 3 und 6 zum zweiten Pressnip läuft, der von der Schuhwalze 11 und der Gegenwalze 13 gebildet wird. Insgesamt ist es vorteilhaft, wenn die Strecke von der Abnahmesaugwalze 15 bis zum Beginn des Sandwichbereiches möglichst kurz ist. Auch der Sandwichbereich sollte möglichst kurz gehalten werden, eben gerade so lange dass Wassersammeiwannen und andere notwendige Elemente konstruktiv untergebracht werden können. Durch den effektiven Einsatz des Dampfblaskastens 41 wird die Entwässerung der Faserstoffbahn 1 im zweiten Pressnip nennenswert verbessert. Besonders bei schweren Sorten ist das notwendig, um höhere Produktionsgeschwindigkeit und die dafür notwendige höhere Entwässerungsmenge zu erreichen.In Figure 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. After the first press nip, which is formed by the shoe press roll 10 and the counter roll 12, the fibrous web 1 is held by means of Saugfilzleitwalze 17 on the lower press felt 5 and then taken over by means of Abnahmesaugwalze 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. At the end of the curved web path, 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 formed by the shoe roll 11 and the backing roll 13. Overall, it is advantageous if the distance from the Abnahmesaugwalze 15 to the beginning of the sandwich area is as short as possible. Also, 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.

Fig.4 zeigt in einer Detaildarstellung eine bevorzugte Ausführungsform für das Stützelement. Die Faserstoffbahn 1 wird mit Hilfe der Abnahmesaugwalze 19 von der vorangehenden Bespannung 7, die ein unterer Pressfilz oder auch ein Formersieb sein kann, auf den oberen Pressfilz 8 übernommen. Das Stützelement 31 weist sechs Stützleisten 34 auf, die den annähernd konvex gekrümmten Bahnlaufweg für den oberen Pressflz 8 und die Faserstoffbahn 1 vorgeben. Das Stützelement 31 kann unbesaugt oder mit Absaugung ausgeführt sein. Die erste Kontaktlinie C des Stützelementes zum oberen Pressfilz folgt kurz nach dem Ablaufpunkt A. Im Bereich des annähernd konvex gekrümmten Bahnlaufweges von C bis D ist die erzeugte Normalkraft als Pfeile angedeutet. Figure 4 shows a detail of a preferred embodiment of the support element. The fibrous web 1 is taken over by the Abnahmesaugwalze 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.

Die weitere Detailansicht in Fig.5 zeigt ein Stützelement 32, das so ausgeführt ist, dass sich ein kurzer Abstand vom Ablaufpunkt A bis zur ersten Kontaktlinie C und ein kurzer Abstand vom Ende D des annähernd konvex gekrümmten Bahnlaufweges bis zum Beginn des Sandwichbereiches B ergeben. Dadurch ist eine hervorragende Stabilisierung des Bahnlaufes gegeben und dennoch besteht keine Gefahr, dass die Bespannungen oder das Stützelement beschädigt werden, wenn beim Überführen Batzen oder Fetzen durchlaufen. Über eine Abdichtung 33 ist das Stützelement 32 so mit der Abnahmesaugwalze 19 verbunden, dass zumindest keine Luft in den Bereich des annähernd konvex gekrümmten Bahnlaufweges eingezogen wird. Falls der Saugkasten der Abnahmesaugwalze 19 entsprechend positioniert ist, kann das Stützelement indirekt von der Abnahmesaugwalze 19 mit besaugt werden.The further detail view in Figure 5 shows a support member 32 which is designed so that there is a short distance from the drain point A to the first contact line C and a short distance from the end D of the approximately convexly curved Bahnlaufweges to the beginning of the sandwich area B. As a result, an excellent stabilization of the web run is given and yet there is no risk that the fabric or the support element will be damaged if pass through batches or shreds during the transfer. Via a seal 33, the support member 32 is connected to the Abnahmesaugwalze 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 Abnahmesaugwalze 19 is positioned accordingly, the support member can be indirectly drawn from the Abnahmesaugwalze 19 with.

Fig.6 stellt in einer Detailansicht eine weitere erfindungsgemäße Ausführung dar, bei der der Beginn B des Sandwichbereichs vor dem Ende D des annähernd konvex gekrümmten Bahnlaufweges liegt. Hierbei ist darauf zu achten, dass der Abstand zwischen der Oberfläche der Leitwalze 27 und den den Pressfilz 8 berührenden Teilen des Stützelements 32 ausreichend groß ist, so dass Batzen oder Fetzen durchlaufen können. Figure 6 represents in a detailed view of another embodiment of the invention in which the beginning B of the sandwich area is located in front of 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.

In Fig.7 wird eine Detailansicht noch einer weiteren erfindungsgemäßen Ausführung gezeigt, bei der ebenfalls der Beginn B des Sandwichbereichs vor dem Ende D des annähernd konvex gekrümmten Bahnlaufweges liegt. Durch das Vermeiden einer Stützleiste 34 im direkten Bereich der Leitwalze 27 wird erreicht, dass der Abstand zwischen der Oberfläche der Leitwalze 27 und dem Stützelement 35 ausreichend groß ist, so dass Batzen oder Fetzen durchlaufen können. Das Siebsandwich kann ausweichen, da keine starren Teile des Stützelements den Pressfilz 8 in diesem Bereich berühren.In Figure 7 a detail view of yet another embodiment of the invention is shown, in which also the beginning B of the sandwich area before the end D of the approximately convex curved web travel path. By avoiding a support strip 34 in the direct area of the guide roller 27 it is achieved that the distance between the surface of the guide roller 27 and the support element 35 is sufficiently large so that batches or shreds can pass through. The sieve sandwich can escape, since no rigid parts of the support element touch the press felt 8 in this area.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
FaserstoffbahnFibrous web
2, 3, 82, 3, 8
oberer PressfilzUpper press felt
44
Trockensiebdryer
5, 6, 95, 6, 9
untere Pressenbespannunglower press cover
77
vorangehende Bespannungprevious covering
10, 1110, 11
Presswalzepress roll
12, 1312, 13
Gegenwalzebacking roll
14, 15, 1914, 15, 19
Abnahmesaugwalzepick-up suction
1616
Abnahmesaugwalze in TrockenpartieRemoval suction roll in the dryer section
17,1817.18
SaugflizleitwalzeSaugflizleitwalze
20,21,22,23,24,25,26,2720,21,22,23,24,25,26,27
Leitwalzeguide roll
30,31,32,3530,31,32,35
Stützelementesupport elements
3333
Abdichtungseal
3434
Stützleistensupport strips
AA
Ablaufpunkt von AbnahmesaugwalzeExpiration point of acceptance suction roll
BB
Beginn des SandwichbereichesBeginning of the sandwich area
CC
erste Kontaktlinie zum oberen Pressfilzfirst contact line to the upper press felt
DD
Ende des annähernd konvex gekrümmten BahnlaufwegesEnd of the approximately convexly curved web travel path

Claims (15)

  1. Pressing section of a machine for producing a fibrous web (1), in particular a paper, cardboard or pulp web, having at least one pressure nip which is formed between a press roll (10, 11) and a mating roll (12, 13), it being possible for the fibrous web (1) to be transferred upstream of the pressure nip with the aid of a suction pick-up roll (14, 15, 19) from a preceding fabric (5, 7) to an upper press felt (2, 3, 8), and the said fibrous web (1) being guided through the pressure nip between the upper press felt (2, 3, 8) and a lower fabric (5, 6, 9), a stationary supporting element (30, 31, 32) being in contact with that side of the upper press felt (2, 3, 8) which faces away from the web downstream of the suction pick-up roll (14, 15, 19) and upstream of the pressure nip in such a way this results in an approximately convexly curved web running path for the fibrous web (1), characterized in that the supporting element (30, 31, 32) has a first contact line (C) with the upper press felt (2, 3, 8), which contact line (C) lies upstream in the web running direction of the start (B) of a sandwich region which is formed by the upper press felt (2, 3, 8) and the lower fabric (5, 6, 9).
  2. Pressing section according to Claim 1, characterized in that the approximately convexly curved web running path extends at least to such an extent that the spacing between the end (D) of the approximately convexly curved web running path and the start (B) of the sandwich region which is formed by the upper press felt (2, 3, 8) and the lower fabric (5, 6, 9) is between 20 and 500 mm, preferably between 20 and 250 mm, particularly preferably between 20 and 100 mm.
  3. Pressing section according to either of the preceding claims, characterized in that the supporting element has the first contact line (C) with the upper press felt (2, 3, 8), which first contact line (C) is at most 350 mm, preferably at most 250 mm, away from the running-off point (A) of the press felt on the suction pick-up roll (14, 15, 19) in the web running direction.
  4. Pressing section according to one of the preceding claims, characterized in that the approximately convexly curved web running path (C to D) has a length of more than 200 mm and at most 2000 mm, preferably at most 1300 mm, particularly preferably at most 1000 mm.
  5. Pressing section according to one of the preceding claims, characterized in that the supporting element (30, 31, 32) is designed in such a way that an effective curvature radius of between 150 and 10 000 mm, preferably between 500 and 5000 mm and particularly preferably between 750 and 2500 mm results for the approximately convexly curved web running path.
  6. Pressing section according to one of the preceding claims, characterized in that, per metre length of the approximately convexly curved web running path, the supporting element (30, 31, 32) has at least four supporting bars (34) which are arranged transversely with respect to the machine running direction and come into contact with the upper press felt (2, 3, 8), and/or in that the supporting element (30, 31, 32) has from four to fifteen, preferably from four to ten supporting bars (34) which are arranged transversely with respect to the machine running direction and come into contact with the upper press felt (2, 3, 8).
  7. Pressing section according to one of the preceding claims, characterized in that the pressure nip is the second pressure nip of the pressing section and is arranged, in particular, downstream of a first pressure nip which is configured as a shoe pressure nip.
  8. Pressing section according to one of Claims 1 to 6, characterized in that the pressure nip is the first pressure nip of the pressing section and, in particular, the only pressure nip of the pressing section.
  9. Pressing section according to one of the preceding claims, characterized in that the supporting element (30, 31, 32) is not evacuated directly or indirectly and is not loaded with vacuum.
  10. Pressing section according to one of the preceding Claims 1 to 8, characterized in that the supporting element (30, 31, 32) is loaded with vacuum by being connected directly to a suction means or being evacuated indirectly by the suction pick-up roll (14, 15, 19), or by a suction effect being generated on the supporting element (30, 31, 32) via a corresponding foil nozzle which is supplied with compressed air.
  11. Pressing section according to Claim 10, characterized in that the vacuum which is measured in the region of the supporting element (30, 31, 32) on that side of the upper press felt (2, 3, 8) which faces away from the web lies between 0.5 and 20 kPa, preferably between 0.5 and 10 kPa and particularly preferably between 1 and 5 kPa.
  12. Pressing section according to one of the preceding claims, characterized in that a steam blower box (41) which can blow steam onto the fibrous web is provided on that side of the upper press felt (2, 3, 8) which lies opposite the supporting element (30, 31, 32) and/or the suction roll (14, 15, 19).
  13. Pressing section according to Claim 12, characterized in that the box length of the steam blower box (41) is at most 1000 mm, preferably at most 500 mm, particularly preferably at most 350 mm in the web running direction.
  14. Pressing section according to Claim 12 or 13, characterized in that the nozzle openings of the steam blower box (41), from which the steam flows, have a diameter of between 1 and 10 mm.
  15. Pressing section according to one of the preceding claims, characterized in that the drives of the pressing section are configured in such a way that a differential speed of between 0.3 and 2%, preferably between 0.5 and 1.5% from the upper press felt (2, 3, 8) to the preceding fabric (5, 7) can be set.
EP12731453.2A 2011-09-06 2012-07-03 Pressing section of a machine for producing a fibrous web Active EP2753751B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011082161A DE102011082161A1 (en) 2011-09-06 2011-09-06 Press section of a machine for producing a fibrous web
PCT/EP2012/062892 WO2013034331A1 (en) 2011-09-06 2012-07-03 Pressing section of a machine for producing a fibrous web

Publications (2)

Publication Number Publication Date
EP2753751A1 EP2753751A1 (en) 2014-07-16
EP2753751B1 true EP2753751B1 (en) 2016-08-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12731453.2A Active EP2753751B1 (en) 2011-09-06 2012-07-03 Pressing section of a machine for producing a fibrous web

Country Status (4)

Country Link
EP (1) EP2753751B1 (en)
CN (1) CN103781966B (en)
DE (1) DE102011082161A1 (en)
WO (1) WO2013034331A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015086294A1 (en) * 2013-12-13 2015-06-18 Voith Patent Gmbh Method and machine for producing pulp boards
DE102016201333A1 (en) 2016-01-29 2017-08-03 Voith Patent Gmbh press section
DE102016201338A1 (en) 2016-01-29 2017-08-03 Voith Patent Gmbh Press
DE102018116125B4 (en) * 2018-07-04 2021-12-30 Voith Patent Gmbh Press section
DE102022120745A1 (en) 2022-08-17 2023-08-24 Voith Patent Gmbh Press section of a machine for producing a fibrous web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1007274B (en) * 1985-04-23 1990-03-21 美商贝洛特公司 Extended nip press arrangement
DE19919085A1 (en) * 1999-04-27 2000-11-02 Voith Sulzer Papiertech Patent Papermaking machine press section to extract water from a wet web has a separation section between the roller press gaps where the blankets and the web move on separate paths
DE19934875A1 (en) 1999-07-24 2001-01-25 Voith Paper Patent Gmbh Paper machine
DE19939893A1 (en) * 1999-08-23 2001-03-01 Voith Paper Patent Gmbh Web press section at a papermaking/cardboard prodn machine has a center press roller with flanking suction and shoe press rollers and a closed web path with blanket separation to the next drying station
DE10109382A1 (en) * 2001-02-27 2002-09-05 Voith Paper Patent Gmbh Web press section has guide rollers for the upper and lower press blankets, and a stabilizing shoe in contact with the upper blanket, to guide the web accurately through the roller press gap without a suction roller
DE102004042637A1 (en) 2004-09-03 2006-03-09 Voith Paper Patent Gmbh Cutting station for wet web of paper, tissue paper or carton has sliding blade mounted on transverse retractable rail
EP2217759B1 (en) * 2007-11-19 2011-06-29 Metso Paper, Inc. Device for transferring a paper web from a supporting fabric to another

Also Published As

Publication number Publication date
WO2013034331A1 (en) 2013-03-14
CN103781966A (en) 2014-05-07
CN103781966B (en) 2016-04-20
EP2753751A1 (en) 2014-07-16
DE102011082161A1 (en) 2013-03-07

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