EP1072721B1 - Paper machine - Google Patents

Paper machine Download PDF

Info

Publication number
EP1072721B1
EP1072721B1 EP00106510A EP00106510A EP1072721B1 EP 1072721 B1 EP1072721 B1 EP 1072721B1 EP 00106510 A EP00106510 A EP 00106510A EP 00106510 A EP00106510 A EP 00106510A EP 1072721 B1 EP1072721 B1 EP 1072721B1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
machine according
roll
drying
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.)
Expired - Lifetime
Application number
EP00106510A
Other languages
German (de)
French (fr)
Other versions
EP1072721A2 (en
EP1072721A3 (en
Inventor
Thomas Dr. Elenz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7915994&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1072721(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1072721A2 publication Critical patent/EP1072721A2/en
Publication of EP1072721A3 publication Critical patent/EP1072721A3/en
Application granted granted Critical
Publication of EP1072721B1 publication Critical patent/EP1072721B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the invention relates to a machine for producing and / or thickening a fibrous web with a press section for dewatering this, an upstream former for sheet formation and a downstream dryer section for drying the fibrous web.
  • Such machines are described for example in EP 770 727, wherein the fibrous web is passed through at least two extended press nips of the press section together with a plurality of press felts. Due to the fact that the fibrous web comes into contact with various press felts in the press nips, irregularities in the water absorption capacity or the moisture content of the press felts across the fibrous web can be better compensated for. As a result, the moisture transverse profile of the fibrous web is relatively balanced.
  • the disadvantage here is the large space requirement and the relatively high production cost of the two extended press nips, which are formed with the participation of relatively expensive shoe press rolls.
  • the object of the invention is therefore to provide a paper machine with as small as possible, yet efficient and with the least possible effort associated press section.
  • the press section consists of only one, formed by two press rolls press nip through which next to the fibrous web, arranged on both sides of this, in each case at least one press felt is guided in the former, the dewatering of the fibrous web to a rock content of at least 18 %, preferably at least 20% ensuring means are arranged
  • the first dryer section of the dryer section consists of at most 3 heated drying cylinders, which are partially looped by the fibrous web and the fibrous web from the former to the end of the first dryer group constantly from at least one roll or a band in Form of a forming wire, a press felt, a transfer belt or a Drying screen is supported.
  • the dry content of at least 18%, preferably at least 20% after the former allows the restriction to only one extended press nip in the press section. Because of the nevertheless relatively high moisture content of the fibrous web after the press nip, a closed guidance of the fibrous web from the former is particularly important until the end of the first drying group, especially at high machine speeds. In addition, stretching of the fibrous web must be compensated as quickly as possible due to the high moisture content at the beginning of the dryer section, so at least the first dryer group is designed as short as possible. Otherwise, there is a risk of web breaks or wrinkles. A compensation of the stretch is generally achieved in that the respective following drying group is operated at a higher speed than the previous one.
  • the length of the press nip should be greater than 300 mm, preferably greater than 500 mm.
  • the web speed should not exceed 1500 m / min.
  • the line force in the press nip should be above 800 kN / m, preferably above 1000 kN / m and in particular above 1200 kN / m. As a result, press pulses of more than 60 kPa s can be achieved.
  • At least one suction device should be arranged in the former before the transfer point of the fibrous web to the press section, which sucks through the forming wire, the water from the fibrous web.
  • the fibrous web is passed together with at least one endlessly circulating, water-receptive and / or water-permeable belt through a pre-press nip preferably formed by two rolls ,
  • a pre-press nip preferably formed by two rolls
  • the forming wire as a water-permeable belt should wrap around the evacuated roll.
  • At least one roll in the form of a press roll should also be looped around by a water-absorptive tape in the form of a press felt.
  • a moistening device should preferably be present in the form of a steam blow box for influencing the moisture transverse profile of the fibrous web.
  • sensors for detecting the moisture transverse profile of the fibrous web should be arranged at least in the press section or a following unit, which act at least on the moistening. The results of these sensors can also be used to control the suction device and / or the pressing forces in the pre-press nip in the former.
  • the moistening device but preferably also the suction device and / or the pressing forces can be controlled separately in zones across the fibrous web.
  • the fibrous web should leave the press nip horizontally or downwards inclined and at least over the upper press felt a gutter for collecting the thrown off from the upper press roll water can be arranged.
  • At least the first drying group should be designed very short, preferably at most 2, in particular at most one heated drying cylinder.
  • FIG. 1 shows a schematic section of a paper machine for producing a wood-free paper web with a finished basis weight between 50 and 100 g / m 2 .
  • the fibrous web 1 is guided by a water-permeable forming wire 10 guided to the transfer point to the press section 4.
  • the fibrous web 1 is dewatered to a dry content of at least 20%.
  • the fibrous web 1 is guided together with the forming wire 10 and a water-receptive press felt 19 through a pre-press nip 16 formed by an evacuated roll 17 and a press roll 18.
  • the water is sucked through the water-permeable belt 15 in the form of Formersiebes 10 in a suction device 12 in the form of the evacuated roller 17.
  • the squeezed out water is taken up by the water-absorptive band 15 in the form of the press felt 19 and transported away.
  • each press roll 5 is looped by an endlessly circulating press felt 6.7.
  • the fibrous web 1 is transferred from the forming wire 10 to the upper press felt 6, which is supported by an evacuated guide roll 22 of the upper press felt 6.
  • both press felts 6.7 are brought together, the lower press felt 7 via a humidifier 13th guided in the form of a steam blower box, the water vapor is used to influence the moisture profile of the fibrous web 1.
  • the lower press felt 7 is separated with the fibrous web 1 from the upper press felt 6, which is supported by a separating sucker 24. Subsequently, the fibrous web 1 is transferred to the dryer fabric 10 of the first drying group 8, which is also supported by a suctioned guide roll 22 of the dryer fabric 11.
  • the upper press felt 6 Since much water is obtained in the single press nip of the press section 4, the upper press felt 6 leaves the press nip inclined downwards so that there is plenty of room for a channel 20 for catching the thrown-off water of the upper press roll 5. Of course, a gutter can also be used under the lower press roll 5. After the press nip or the delivery of the fibrous web 1 both press felts must be 6.7 cleaned by conditioning 21 and dried.
  • the first drying group 8 consists only of a heated drying cylinder 9, over which the fibrous web 1 is guided, wherein the fibrous web 1 is pressed by the drying wire 11 of this drying group 8 against the drying cylinder 9.
  • the fibrous web 1 is always supported by a roller or a belt, so that a safe run of the fibrous web 1 is ensured even at high speeds.
  • the generally endless circulating belts are guided over normal 23 or evacuated guide rollers 22.
  • the fibrous web 1 is removed from the dryer fabric 11 of the following drying group, of course, before the drying wire 11 of the first drying group 8 has been led away.
  • This transfer makes it possible to drive a higher speed in the second dryer group than in the first dryer group 8. As a result, elongations of the fibrous web 1 can be avoided Wrinkling and breaks are compensated.
  • the fibrous web 1, together with the drying wire 11 of the respective drying group is guided in an analogous manner alternately over drying cylinders 9 and suctioned guide rolls 22.
  • the moisture transverse profile of the fibrous web 1 is measured here by sensors 14, for example in the peripheral region of an evacuated guide roller 22.
  • the result of this measurement is used in the control of the moistening device 13, the vacuum level of the suction roller 17 as well as the pressing forces emanating from the pressure roller 18.
  • the humidification, suction and pressure in zones across the fibrous web are separately controllable. This allows the production of the most uniform moisture profile of the fibrous web 1 even with only one press nip in the press section. 4
  • the press nip itself is formed by a cylindrical lower press roll 5 and an upper shoe press roll 5, wherein the shoe press roll 5 consists of a flexible press jacket, which it is guided over a pressure shoe with concave contact surface. This allows the formation of long press nips over 300 mm in length.
  • the line force in the press nip is above 1000 kN / m and the web speed at 1200 m / min.

Landscapes

  • Paper (AREA)

Description

Die Erfindung betrifft eine Maschine zur Herstellung und/oder Verdelung einer Faserstoffbahn mit einer Pressenpartie zur Entwässerung dieser, einem vorgelagerten Former zur Blattbildung und einer nachgeordneten Trockenpartie zur Trocknung der Faserstoffbahn.The invention relates to a machine for producing and / or thickening a fibrous web with a press section for dewatering this, an upstream former for sheet formation and a downstream dryer section for drying the fibrous web.

Derartige Maschinen sind beispielsweise in der EP 770 727 beschrieben, wobei die Faserstoffbahn durch zumindest zwei verlängerte Preßspalte der Pressenpartie gemeinsam mit mehreren Preßfilzen geführt wird. Dadurch, daß die Faserstoffbahn in den Preßspalten mit verschiedenen Preßfilzen in Kontakt kommt, können sich Unregelmäßigkeiten in der Wasseraufnahmefähigkeit oder dem Feuchtegehalt der Preßfilze quer zur Faserstoffbahn betrachtet, besser ausgleichen. Im Ergebnis ist das Feuchtequerprofil der Faserstoffbahn relativ ausgeglichen.Such machines are described for example in EP 770 727, wherein the fibrous web is passed through at least two extended press nips of the press section together with a plurality of press felts. Due to the fact that the fibrous web comes into contact with various press felts in the press nips, irregularities in the water absorption capacity or the moisture content of the press felts across the fibrous web can be better compensated for. As a result, the moisture transverse profile of the fibrous web is relatively balanced.

Nachteilig ist dabei der große Raumbedarf sowie der relativ hohe Herstellungsaufwand für die beiden verlängerten Preßspalte, die unter Mitwirkung relativ teurer Schuh-Presswalzen gebildet werden.The disadvantage here is the large space requirement and the relatively high production cost of the two extended press nips, which are formed with the participation of relatively expensive shoe press rolls.

Die Aufgabe der Erfindung ist es daher, eine Papiermaschine mit einer möglichst kleinen, dennoch effizienten und mit möglichst geringem Aufwand verbundenen Pressenpartie zu schaffen.The object of the invention is therefore to provide a paper machine with as small as possible, yet efficient and with the least possible effort associated press section.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, daß die Pressenpartie aus nur einem, von zwei Presswalzen gebildeten Preßspalt besteht, durch den neben der Faserstoffbahn, beidseitig dieser angeordnet, jeweils zumindest ein Preßfilz geführt ist, im Former die Entwässerung der Faserstoffbahn auf einen rockengehalt von mindestens 18%, vorzugsweise mindestens 20% gewährleistende Mittel angeordnet sind, die erste Trockengruppe der Trockenpartie aus höchstens 3 beheizten Trockenzylindern besteht, welche von der Faserstoffbahn teilweise umschlungen sind und die Faserstoffbahn vom Former bis zum Ende der ersten Trockengruppe ständig von wenigstens einer Walze oder einem Band in Form eines Formersiebes, eines Preßfilzes, eines Transferbandes oder eines Trockensiebes gestützt ist.According to the invention this object is achieved in that the press section consists of only one, formed by two press rolls press nip through which next to the fibrous web, arranged on both sides of this, in each case at least one press felt is guided in the former, the dewatering of the fibrous web to a rock content of at least 18 %, preferably at least 20% ensuring means are arranged, the first dryer section of the dryer section consists of at most 3 heated drying cylinders, which are partially looped by the fibrous web and the fibrous web from the former to the end of the first dryer group constantly from at least one roll or a band in Form of a forming wire, a press felt, a transfer belt or a Drying screen is supported.

Der Trockengehalt von mindestens 18%, vorzugsweise mindestens 20% nach dem Former ermöglicht die Beschränkung auf nur einen verlängerten Preßspalt in der Pressenpartie. Wegen des dennoch relativ hohen Feuchtegehaltes der Faserstoffbahn nach dem Preßspalt ist eine geschlossene Führung der Faserstoffbahn vom Former insbesondere bis zum Ende der ersten Trockengruppe vor allem bei hohem Maschinengeschwindigkeiten wichtig. Außerdem müssen Streckungen der Faserstoffbahn auch infolge des hohen Feuchtegehaltes am Anfang der Trockenpartie möglichst schnell ausgeglichen werden, weswegen zumindest die erste Trockengruppe möglichst kurz gestaltet ist. Ansonsten bestünde die Gefahr von Bahnabrissen oder Faltenbildung. Ein Ausgleich der Streckung wird im allgemeinen dadurch erreicht, daß die jeweils folgende Trockengruppe mit einer höheren Geschwindigkeit betrieben wird als die vorige.The dry content of at least 18%, preferably at least 20% after the former allows the restriction to only one extended press nip in the press section. Because of the nevertheless relatively high moisture content of the fibrous web after the press nip, a closed guidance of the fibrous web from the former is particularly important until the end of the first drying group, especially at high machine speeds. In addition, stretching of the fibrous web must be compensated as quickly as possible due to the high moisture content at the beginning of the dryer section, so at least the first dryer group is designed as short as possible. Otherwise, there is a risk of web breaks or wrinkles. A compensation of the stretch is generally achieved in that the respective following drying group is operated at a higher speed than the previous one.

Um im Preßspalt für eine ausreichende Entwässerung zu sorgen, sollte die Länge des Preßspaltes größer als 300 mm, vorzugsweise größer als 500 mm sein. In diesem Zusammenhang sollte zur Gewährleistung einer ausreichenden Preßzeit die Bahngeschwindigkeit nicht mehr als 1500 m/min betragen. Außerdem sollte die Linienkraft im Preßspalt über 800 kN/m, vorzugsweise über 1000 kN/m und insbesondere über 1200 kN/m liegen. Hierdurch lassen sich Pressimpulse von mehr als 60 kPa s erreichen. Da diesen Werten jedoch aus maschinenbaulicher Sicht und Kostengründen sowie der Belastbarkeit der Preßfilze obere Grenzen gesetzt sind, erscheint der Einsatz insbesondere für die Herstellung von Faserstoffbahnen mit einem Flächengewicht zwischen 50 und 200 g/m2 vorzugsweise zwischen 50 und 100 g/m2 und/oder zur Herstellung von holzfreien Papierbahnen besonders geeignet. In allen anderen Fällen wären die Anforderungen an die Pressenpartie relativ hoch, jedoch auch realisierbar.In order to ensure sufficient dewatering in the press nip, the length of the press nip should be greater than 300 mm, preferably greater than 500 mm. In this connection, to ensure a sufficient pressing time, the web speed should not exceed 1500 m / min. In addition, the line force in the press nip should be above 800 kN / m, preferably above 1000 kN / m and in particular above 1200 kN / m. As a result, press pulses of more than 60 kPa s can be achieved. Since these values, however, have upper limits for mechanical engineering and cost reasons as well as the load capacity of the press felts, the use, in particular for the production of fibrous webs having a basis weight between 50 and 200 g / m 2, preferably between 50 and 100 g / m 2 and / or particularly suitable for the production of wood-free paper webs. In all other cases, the requirements for the press section would be relatively high, but also feasible.

Um ständig einen Trockengehalt von mindestens 18%, vorzugsweise mindestens 20% gewährleisten zu können, sollte im Former vor der Übergabestelle der Faserstoffbahn an die Pressenpartie zumindest eine Saugeinrichtung angeordnet sein, welche durch das Formersieb hindurch das Wasser aus der Faserstoffbahn saugt. In Kombination oder für sich allein ist es jedoch auch möglich, daß im Former vor der Übergabestelle der Faserstoffbahn an die Pressenpartie die Faserstoffbahn gemeinsam mit wenigstens einem endlos umlaufenden, wasseraufnahmefähigen und/oder wasserdurchlässigen Band durch eine vorzugsweise von zwei Walzen gebildeten Vor-Preßspalt geführt wird. Im Fall der Kombination, das heißt wenn der Vor-Preßspalt von zwei Walzen in Form einer besaugten Walze und einer Presswalze gebildet wird, sollte das Formersieb als wasserdurchlässiges Band die besaugte Walze umschlingenden.To maintain a dry content of at least 18%, preferably at least 20% To be able to guarantee, at least one suction device should be arranged in the former before the transfer point of the fibrous web to the press section, which sucks through the forming wire, the water from the fibrous web. In combination or on its own, however, it is also possible that in the former before the transfer point of the fibrous web to the press section, the fibrous web is passed together with at least one endlessly circulating, water-receptive and / or water-permeable belt through a pre-press nip preferably formed by two rolls , In the case of the combination, that is, when the pre-press nip is formed by two rolls in the form of an evacuated roll and a press roll, the forming wire as a water-permeable belt should wrap around the evacuated roll.

Zur Aufnahme des im Vor-Preßspalt ausgepreßten Wassers sollte des weiteren zumindest eine Walze in Form einer Presswalze von einem wasseraufnahmefähigen Band in Form eines Preßfilzes umschlungen sein.For receiving the water pressed out in the pre-press nip, at least one roll in the form of a press roll should also be looped around by a water-absorptive tape in the form of a press felt.

Außerdem sollte in der Pressenpartie vor dem Preßspalt eine Befeuchtungseinrichtung vorzugsweise in Form eines Dampfblaskastens zur Beeinflussung des Feuchtequerprofils der Faserstoffbahn vorhanden sein. Damit kann die vergleichmäßigende Wirkung von mehreren Preßspalten innerhalb der Pressenpartie nicht nur erreicht, sondern auch überboten werden. Hierzu sollten zumindest in der Pressenpartie oder einer folgenden Einheit Sensoren zur Erfassung des Feuchtequerprofils der Faserstoffbahn angeordnet sein, welche wenigstens auf die Befeuchtungseinrichtung einwirken. Die Ergebnisse dieser Sensoren können auch zur Steuerung der Saugeinrichtung und/oder der Presskräfte im Vor-Preßspalt im Former benutzt werden. Die setzt allerdings voraus, daß zumindest die Befeuchtungseinrichtung vorzugsweise jedoch auch die Saugeinrichtung und/oder die Presskräfte quer zur Faserstoffbahn in Zonen separat steuerbar sind.In addition, in the press section in front of the press nip, a moistening device should preferably be present in the form of a steam blow box for influencing the moisture transverse profile of the fibrous web. Thus, the comparative effect of several press nips within the press section can not only be achieved, but also outbid. For this purpose, sensors for detecting the moisture transverse profile of the fibrous web should be arranged at least in the press section or a following unit, which act at least on the moistening. The results of these sensors can also be used to control the suction device and / or the pressing forces in the pre-press nip in the former. However, this assumes that at least the moistening device but preferably also the suction device and / or the pressing forces can be controlled separately in zones across the fibrous web.

Da im einzigen Preßspalt der Pressenpartie sehr viel Wasser anfällt, sollte die Faserstoffbahn den Preßspalt horizontal oder nach unten geneigt verlassen und zumindest über dem oberen Preßfilz eine Rinne zum Auffangen des von der oberen Presswalze abgeschleuderten Wassers angeordnet sein.Since in the only press nip of the press section is very much water, the fibrous web should leave the press nip horizontally or downwards inclined and at least over the upper press felt a gutter for collecting the thrown off from the upper press roll water can be arranged.

Außerdem sollte, wie oben beschrieben, wenigstens die erste Trockengruppe sehr kurz, vorzugsweise aus höchstens 2,insbesondere aus höchstens einem beheizten Trockenzylinder gestaltet sein.In addition, as described above, at least the first drying group should be designed very short, preferably at most 2, in particular at most one heated drying cylinder.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur einen schematischen Ausschnitt einer Papiermaschine zur Herstellung einer holzfreien Papierbahn mit einem fertigen Flächengewicht zwischen 50 und 100 g/m2.The invention will be explained in more detail with reference to an exemplary embodiment. In the accompanying drawing, the figure shows a schematic section of a paper machine for producing a wood-free paper web with a finished basis weight between 50 and 100 g / m 2 .

Im dargestellten Endbereich des Formers 2 wird dabei die Faserstoffbahn 1 von einem wasserdurchlässigen Formersieb 10 gestützt zur Übergabestelle an die Pressenpartie 4 geführt. Im Former 2 wird die Faserstoffbahn 1 auf einen Trockengehalt von mindestens 20% entwässert. Um dies ständig gewährleisten zu können, wird die Faserstoffbahn 1 gemeinsam mit dem Formersieb 10 sowie einem wasseraufnahmefähigen Preßfilz 19 durch einen, von einer besaugten Walze 17 und einer Presswalze 18 gebildeten Vor-Preßspalt 16 geführt. Dabei wird das Wasser durch das wasserdurchlässige Band 15 in Form des Formersiebes 10 in eine Saugeinrichtung 12 in Form der besaugten Walze 17 gesaugt. Auf der gegenüberliegenden Seite wird das ausgepreßte Wasser von dem wasseraufnahmefähigen Band 15 in Form des Preßfilzes 19 aufgenommen und wegtransportiert.In the illustrated end region of the former 2, the fibrous web 1 is guided by a water-permeable forming wire 10 guided to the transfer point to the press section 4. In the former 2, the fibrous web 1 is dewatered to a dry content of at least 20%. In order to be able to ensure this constantly, the fibrous web 1 is guided together with the forming wire 10 and a water-receptive press felt 19 through a pre-press nip 16 formed by an evacuated roll 17 and a press roll 18. The water is sucked through the water-permeable belt 15 in the form of Formersiebes 10 in a suction device 12 in the form of the evacuated roller 17. On the opposite side, the squeezed out water is taken up by the water-absorptive band 15 in the form of the press felt 19 and transported away.

Danach erfolgt die Entwässerung in dem von zwei Presswalzen 5 gebildeten, verlängerten Preßspalt der Pressenpartie 4,wobei jede Presswalze 5 von einem endlos umlaufenden Preßfilz 6,7 umschlungen ist. Beispielhaft wird die Faserstoffbahn 1 vom Formersieb 10 an den oberen Preßfilz 6 übergeben, was von einer besaugten Leitwalze 22 des oberen Preßfilzes 6 unterstützt wird. Nachdem beide Preßfilze 6,7 zusammengeführt sind, wird der untere Preßfilz 7 über eine Befeuchtungseinrichtung 13 in Form eines Dampfblaskastens geführt, dessen Wasserdampf zur Beeinflussung des Feuchtequerprofils der Faserstoffbahn 1 dient.Thereafter, the dewatering takes place in the formed by two press rolls 5, extended press nip of the press section 4, wherein each press roll 5 is looped by an endlessly circulating press felt 6.7. By way of example, the fibrous web 1 is transferred from the forming wire 10 to the upper press felt 6, which is supported by an evacuated guide roll 22 of the upper press felt 6. After both press felts 6.7 are brought together, the lower press felt 7 via a humidifier 13th guided in the form of a steam blower box, the water vapor is used to influence the moisture profile of the fibrous web 1.

Nach dem Preßspalt wird der untere Preßfilz 7 mit der Faserstoffbahn 1 von dem oberen Preßfilz 6 getrennt, was durch einen Trennsauger 24 unterstützt wird. Anschließend wird die Faserstoffbahn 1 an das Trockensieb 10 der ersten Trockengruppe 8 übergeben, was ebenfalls von einer besaugten Leitwalze 22 des Trockensiebes 11 unterstützt wird.After the press nip, the lower press felt 7 is separated with the fibrous web 1 from the upper press felt 6, which is supported by a separating sucker 24. Subsequently, the fibrous web 1 is transferred to the dryer fabric 10 of the first drying group 8, which is also supported by a suctioned guide roll 22 of the dryer fabric 11.

Da im einzigen Preßspalt der Pressenpartie 4 viel Wasser anfällt, verläßt der obere Preßfilz 6 den Preßspalt nach unten geneigt, so daß viel Platz für eine Rinne 20 zum Auffangen des abgeschleuderten Wassers der oberen Presswalze 5 bleibt. Unter der unteren Presswalze 5 kann natürlich auch eine Rinne zur Anwendung kommen. Nach dem Preßspalt bzw. der Abgabe der Faserstoffbahn 1 müssen beide Preßfilze 6,7 von Konditioniereinrichtungen 21 gereinigt und getrocknet werden.Since much water is obtained in the single press nip of the press section 4, the upper press felt 6 leaves the press nip inclined downwards so that there is plenty of room for a channel 20 for catching the thrown-off water of the upper press roll 5. Of course, a gutter can also be used under the lower press roll 5. After the press nip or the delivery of the fibrous web 1 both press felts must be 6.7 cleaned by conditioning 21 and dried.

Die erste Trockengruppe 8 besteht nur aus einem beheizten Trockenzylinder 9,über den die Faserstoffbahn 1 geführt ist, wobei die Faserstoffbahn 1 vom Trockensieb 11 dieser Trockengruppe 8 gegen den Trockenzylinder 9 gedrückt wird.The first drying group 8 consists only of a heated drying cylinder 9, over which the fibrous web 1 is guided, wherein the fibrous web 1 is pressed by the drying wire 11 of this drying group 8 against the drying cylinder 9.

Vom Former 2 bis in die Trockenpartie 3 ist die Faserstoffbahn 1 immer von einer Walze oder einem Band gestützt, so daß ein sicherer Lauf der Faserstoffbahn 1 auch bei hohen Geschwindigkeiten gewährleistet ist. Die im allgemeinen endlos umlaufenden Bänder sind über normale 23 oder besaugte Leitwalzen 22 geführt.From the former 2 to the dryer section 3, the fibrous web 1 is always supported by a roller or a belt, so that a safe run of the fibrous web 1 is ensured even at high speeds. The generally endless circulating belts are guided over normal 23 or evacuated guide rollers 22.

Vom Trockenzylinder 9 wird die Faserstoffbahn 1 vom Trockensieb 11 der folgenden Trockengruppe abgenommen, wobei natürlich vorher das Trockensieb 11 der ersten Trockengruppe 8 weggeführt worden Ist. Diese Übergabe erlaubt es, in der zweiten Trockengruppe eine höhere Geschwindigkeit als in der ersten Trockengruppe 8 zu fahren. Im Ergebnis können Streckungen der Faserstoffbahn 1 zur Vermeidung von Faltenbildung und Abrissen ausgeglichen werden.From the drying cylinder 9, the fibrous web 1 is removed from the dryer fabric 11 of the following drying group, of course, before the drying wire 11 of the first drying group 8 has been led away. This transfer makes it possible to drive a higher speed in the second dryer group than in the first dryer group 8. As a result, elongations of the fibrous web 1 can be avoided Wrinkling and breaks are compensated.

In den folgenden Trockengruppen wird die Faserstoffbahn 1 gemeinsam mit dem Trockensieb 11 der jeweiligen Trockengruppe in analoger Weise abwechselnd über Trockenzylinder 9 und besaugte Leitwalzen 22 geführt.In the following drying groups, the fibrous web 1, together with the drying wire 11 of the respective drying group, is guided in an analogous manner alternately over drying cylinders 9 and suctioned guide rolls 22.

Am Anfang der Trockenpartie 3 wird hier beispielhaft im Umfangsbereich einer besaugten Leitwalze 22 das Feuchtequerprofil der Faserstoffbahn 1 von Sensoren 14 gemessen. Das Ergebnis dieser Messung wird bei der Steuerung der Befeuchtungseinrichtung 13,der Vakuumhöhe der Saugwalze 17 sowie der, von der Presswalze 18 ausgehenden Presskräfte verwendet. Dabei sind die Befeuchtung, Besaugung und Pressung in Zonen quer zur Faserstoffbahn separat steuerbar. Dies ermöglicht die Erzeugung eines möglichst gleichmäßigen Feuchtequerprofils der Faserstoffbahn 1 auch bei nur einem Preßspalt in der Pressenpartie 4.At the beginning of the dryer section 3, the moisture transverse profile of the fibrous web 1 is measured here by sensors 14, for example in the peripheral region of an evacuated guide roller 22. The result of this measurement is used in the control of the moistening device 13, the vacuum level of the suction roller 17 as well as the pressing forces emanating from the pressure roller 18. The humidification, suction and pressure in zones across the fibrous web are separately controllable. This allows the production of the most uniform moisture profile of the fibrous web 1 even with only one press nip in the press section. 4

Der Preßspalt selbst wird von einer zylindrischen unteren Presswalze 5 sowie einer oberen Schuh-Presswalze 5 gebildet, wobei die Schuh-Presswalze 5 aus einem flexiblen Preßmantel besteht, die er über einen Anpreßschuh mit konkaver Anpreßfläche geführt wird. Diese erlaubt die Bildung von langen Preßspalten mit über 300 mm Länge. Die Linienkraft im Preßspalt liegt dabei über 1000 kN/m und die Bahngeschwindigkeit bei 1200 m/min.The press nip itself is formed by a cylindrical lower press roll 5 and an upper shoe press roll 5, wherein the shoe press roll 5 consists of a flexible press jacket, which it is guided over a pressure shoe with concave contact surface. This allows the formation of long press nips over 300 mm in length. The line force in the press nip is above 1000 kN / m and the web speed at 1200 m / min.

Claims (15)

  1. Machine for producing and/or finishing a fibrous web (1), having a press section (4) for dewatering the latter, an upstream former (2) for sheet formation and a downstream drying section (3) for drying the fibrous web (1), characterized in that the press section (4) comprises only one press nip formed by two press rolls (5), through which, in addition to the fibrous web (1), in each case at least one press felt (6, 7) arranged on either side of the latter is guided, means are arranged in the former (2) which ensure the dewatering of the fibrous web to a dryness of at least 18%, preferably at least 20%, the first drying group (8) of the drying section (3) comprises at most 3 heated drying cylinders (9), around which the fibrous web (1) wraps partly, and the fibrous web (1) is supported continuously from the former (2) as far as the end of the first drying group (8) by at least one roll or a belt.
  2. Machine according to Claim 1, characterized in that the length of the press nip is greater than 300 mm, preferably greater than 500 mm.
  3. Machine according to Claim 1 or 2, characterized in that the line force in the press nip is higher than 800 kN/m, preferably higher than 1000 kN/m and in particular higher than 1200 kN/m.
  4. Machine according to one of the preceding claims, characterized in that, in the former (2), before the point of transfer of the fibrous web (1) to the press section (4), there is arranged at least one suction device (12) ensuring a dryness of at least 18%, preferably at least 20%.
  5. Machine according to one of the preceding claims, characterized in that, in the former (2), before the point of transfer of the fibrous web (1) to the press section (4), the fibrous web (1), together with at least one endlessly circulating water-absorbent and/or water-permeable belt (15), can be guided through a pilot press nip (16) preferably formed by two rolls.
  6. Machine according to Claim 5, characterized in that the pilot press nip (16) is formed by two rolls in the form of an evacuated roll (17) and a press roll (18), and the water-permeable belt (15) is formed by the forming fabric (10) wrapping around the evacuated roll (17).
  7. Machine according to Claim 5 or 6, characterized in that at least one roll in the form of a press roll (18) is wrapped around by a water-absorbent belt (15) in the form of a press felt (19).
  8. Machine according to one of the preceding claims, characterized in that, in the press section (4), upstream of the press nip, there is a moistening device (13), preferably in the form of a steam blower box, in order to influence the transverse moisture profile of the fibrous web (1).
  9. Machine according to Claim 8, characterized in that, in the press section (4) and/or a following unit, preferably in the drying section (3), there are arranged sensors (14) for registering the transverse moisture profile of the fibrous web (1), which act at least on the moistening device (13).
  10. Machine according to Claim 9, characterized in that the sensors (14) also act on the suction device (12) and/or the pilot press nip (16) in the former (2).
  11. Machine according to one of the preceding claims, characterized in that the fibrous web (1) between the press felts (6, 7) leaves the press nip horizontally or inclined downwards, and a tray (20) for collecting the water thrown off by the upper press roll (5) is arranged at least above the upper press felt (6).
  12. Machine according to one of the preceding claims, characterized in that the first drying group (8) comprises at least 2, preferably only one heated drying cylinder (9).
  13. Machine according to one of the preceding claims, characterized in that it is suitable for producing a fibrous web (1) with a grammage of between 50 and 200 g/m2, preferably between 50 and 100 g/m2.
  14. Machine according to one of the preceding claims, characterized in that it is suitable for producing a woodfree paper web.
  15. Machine according to one of the preceding claims, characterized in that the web speed does not exceed 1500 m/min.
EP00106510A 1999-07-24 2000-03-25 Paper machine Expired - Lifetime EP1072721B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934875A DE19934875A1 (en) 1999-07-24 1999-07-24 Paper machine
DE19934875 1999-07-24

Publications (3)

Publication Number Publication Date
EP1072721A2 EP1072721A2 (en) 2001-01-31
EP1072721A3 EP1072721A3 (en) 2001-08-22
EP1072721B1 true EP1072721B1 (en) 2006-06-28

Family

ID=7915994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106510A Expired - Lifetime EP1072721B1 (en) 1999-07-24 2000-03-25 Paper machine

Country Status (5)

Country Link
US (1) US6638395B1 (en)
EP (1) EP1072721B1 (en)
JP (1) JP4717985B2 (en)
CA (1) CA2314347C (en)
DE (2) DE19934875A1 (en)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10108517A1 (en) 2001-02-22 2002-08-29 Voith Paper Patent Gmbh Moisture profile
DE10137095A1 (en) * 2001-07-30 2003-02-13 Voith Paper Patent Gmbh Machine for the production of a fibrous web
FI20020159A (en) * 2002-01-29 2003-07-30 Metso Paper Inc Surface shaping apparatus and method using the apparatus for finishing coated or uncoated fibrous web
JP3691031B2 (en) * 2002-07-19 2005-08-31 三菱重工業株式会社 Paper machine control method
ATE376095T1 (en) * 2002-09-09 2007-11-15 Metso Paper Inc METHOD FOR PRODUCING CARDBOARD AND MACHINE FOR PRODUCING CARDBOARD
US7776185B2 (en) * 2004-08-16 2010-08-17 Voith Patent Gmbh Paper machine comprising a single nip press
DE102004048156A1 (en) * 2004-10-02 2006-04-06 Voith Paper Patent Gmbh Pressing device in a press section of a machine for producing a fibrous web
DE102004050593A1 (en) * 2004-10-16 2006-04-20 Voith Paper Patent Gmbh Press arrangement
DE202005012994U1 (en) * 2005-08-05 2005-11-03 Voith Paper Patent Gmbh Drying press for wet carton, paper or tissue paper web has three drying cylinders each succeeded by a stabilising suction box
US7811417B2 (en) * 2005-12-30 2010-10-12 Honeywell Asca, Inc. Cross-machine direction actuators for machine clothing
FI120747B (en) 2006-09-21 2010-02-15 Metso Paper Inc Paper or cardboard machine
US20080099170A1 (en) * 2006-10-31 2008-05-01 The Procter & Gamble Company Process of making wet-microcontracted paper
DE102006061958A1 (en) † 2006-12-21 2008-06-26 Voith Patent Gmbh Wet part for a machine for producing fibrous webs, in particular a paper machine for producing wood-free papers
DE102007016718A1 (en) 2007-04-07 2008-10-09 Voith Patent Gmbh Machine for producing a fibrous web
US20090136722A1 (en) * 2007-11-26 2009-05-28 Dinah Achola Nyangiro Wet formed fibrous structure product
FI127367B (en) 2008-03-28 2018-04-30 Valmet Technologies Inc Transfer suction box in a machine with fiber web
DE102009045185A1 (en) 2009-09-30 2011-04-07 Voith Patent Gmbh Machine i.e. paper-making machine, for production of e.g. paper web, has pressing arrangement with pressing gap extended in direction of web, and drying device arranged in direction of web between pressing arrangement and smoothing gap
DE102009045177A1 (en) 2009-09-30 2011-04-07 Voith Patent Gmbh Method and machine for producing a fibrous web
DE102010031450A1 (en) 2010-07-16 2012-01-19 Voith Patent Gmbh Method and machine for producing a fibrous web
DE102010031447A1 (en) 2010-07-16 2012-01-19 Voith Patent Gmbh Method for manufacturing fibrous material course, particularly paper, cardboard or tissue course, involves guiding fibrous material course in press arrangement between two endlessly rotating drainage bands
DE102011004568A1 (en) 2011-02-23 2012-08-23 Voith Patent Gmbh Press section of a machine for producing a fibrous web
DE102011004565A1 (en) 2011-02-23 2012-08-23 Voith Patent Gmbh Press section of a machine for producing a fibrous web
DE102011005747A1 (en) 2011-03-18 2012-09-20 Voith Patent Gmbh Sheet binding device
DE102011081239A1 (en) 2011-08-19 2013-02-21 Voith Patent Gmbh Sheet forming apparatus for manufacturing two or multi-layered cardboard- or packing paper web using machine, has belt that directly incorporates one layer and indirectly incorporates another layer made of fiber material suspension
DE102011082161A1 (en) 2011-09-06 2013-03-07 Voith Patent Gmbh Press section of a machine for producing a fibrous web
DE102011082346A1 (en) 2011-09-08 2013-03-14 Voith Patent Gmbh Method for manufacturing fibrous material web i.e. paper web, involves allowing fibrous material web with press felt to come in contact with smooth surface of backing roll or with press felt, where smooth transfer tape loops backing roll
DE102011083367A1 (en) 2011-09-26 2013-03-28 Voith Patent Gmbh Former for machine for manufacturing fibrous material web e.g. paper web, from fibrous material suspension, has lower wire, and felt enclosing suction roller and guided over conducting and adjustable rollers for adjusting felt strain
JP5818607B2 (en) * 2011-09-27 2015-11-18 デュプロ精工株式会社 Paper machine
JP6439347B2 (en) * 2014-09-25 2018-12-19 セイコーエプソン株式会社 Sheet manufacturing equipment
WO2016083172A1 (en) * 2014-11-28 2016-06-02 Voith Patent Gmbh Device for producing a fibrous web
CN107627670A (en) * 2017-08-28 2018-01-26 芜湖润林包装材料有限公司 A kind of corrugated board corner protector blank flat synthesizer
CN111501396A (en) * 2020-04-24 2020-08-07 李东旭 Papermaking device and method

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678594A (en) * 1970-12-16 1972-07-25 Bechtel Int Corp Paper making system and apparatus
US4309246A (en) * 1977-06-20 1982-01-05 Crown Zellerbach Corporation Papermaking apparatus and method
US4440597A (en) * 1982-03-15 1984-04-03 The Procter & Gamble Company Wet-microcontracted paper and concomitant process
US4879001A (en) * 1988-09-12 1989-11-07 Beloit Corporation Twin wire former with roll press followed by extended nip press
US5389205A (en) 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
FI96789C (en) * 1990-11-23 1996-08-26 Valmet Paper Machinery Inc Method and apparatus for dewatering a paper web by pressing
US5087325A (en) * 1991-03-13 1992-02-11 Beloit Corporation Apparatus for manufacturing a dried web of paper
FI112391B (en) * 1993-12-08 2003-11-28 Metso Paper Inc Paper machine press section using a long nip press
US5861082A (en) * 1993-12-20 1999-01-19 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5904811A (en) * 1993-12-20 1999-05-18 The Procter & Gamble Company Wet pressed paper web and method of making the same
US5776307A (en) * 1993-12-20 1998-07-07 The Procter & Gamble Company Method of making wet pressed tissue paper with felts having selected permeabilities
FI942616A (en) * 1994-06-03 1995-12-04 Valmet Corp Paper web pre-press
US5897745A (en) * 1994-06-29 1999-04-27 The Procter & Gamble Company Method of wet pressing tissue paper
FI98843C (en) * 1995-10-03 1997-08-25 Valmet Corp A method and apparatus for removing water from a paper or board web by compression
US5792317A (en) * 1996-02-07 1998-08-11 Gl&V-Paper Machine Group, Inc. Wet end starch application
FI110440B (en) * 1996-04-04 2003-01-31 Metso Paper Inc Transferring the web from the last press nip in the paper machine to the next drying section
DE19636791A1 (en) * 1996-09-11 1998-03-12 Voith Sulzer Papiermasch Gmbh Method and device for removing paper web remnants from a belt
DE19644108A1 (en) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Shoe press
DE29701382U1 (en) * 1997-01-28 1997-03-20 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Press section of a paper machine
US5830316A (en) * 1997-05-16 1998-11-03 The Procter & Gamble Company Method of wet pressing tissue paper with three felt layers
DE69828812T2 (en) * 1997-11-14 2006-03-30 Metso Paper, Inc. METHOD FOR THE PRODUCTION OF CALENDERED PAPER
US6168687B1 (en) * 1998-04-24 2001-01-02 Honeywell-Measurex Corporation System and method for sheet measurement and control in papermaking machine
US6103062A (en) * 1998-10-01 2000-08-15 The Procter & Gamble Company Method of wet pressing tissue paper

Also Published As

Publication number Publication date
EP1072721A2 (en) 2001-01-31
CA2314347A1 (en) 2001-01-24
DE50013082D1 (en) 2006-08-10
DE19934875A1 (en) 2001-01-25
CA2314347C (en) 2008-12-30
EP1072721A3 (en) 2001-08-22
US6638395B1 (en) 2003-10-28
JP4717985B2 (en) 2011-07-06
JP2001049589A (en) 2001-02-20

Similar Documents

Publication Publication Date Title
EP1072721B1 (en) Paper machine
DE3742848C2 (en)
WO2021219272A1 (en) Machine for producing or treating a fibrous web
WO2022258262A1 (en) Machine for producing or treating a fibrous web
EP1316641B1 (en) Press section
EP3548664B1 (en) Pressing arrangement
EP1778914B1 (en) Paper machine comprising a single-nip press
EP1777342B1 (en) Pressing arrangement
EP3833816A1 (en) Pressing arrangement
EP1116823B1 (en) Dryer section
DE4335024C2 (en) Press section of a paper machine and transfer device
EP1777340B1 (en) Pressing arrangement
WO2003002814A1 (en) Drying section
EP1743974B1 (en) Press section
EP1838919B1 (en) Pressing arrangement
WO2009092477A1 (en) Device for producing and/or processing a fiber material web
DE10137095A1 (en) Machine for the production of a fibrous web
EP1342837B1 (en) Pressing arrangement
DE10022605A1 (en) Web press section for the production of paper/cardboard/tissue has at least two roller press gaps in succession with structured continuous blanket belts and travel paths to prevent extracted water returning to the web
DE10018945A1 (en) Press section at a papermaking or paper finishing machine has a single press gap formed by two rollers for efficient water extraction in a small assembly without costly shoe press rollers
DE102004060547A1 (en) Production of paper, cardboard, tissue or fibrous material course using paper-making machine, comprises drying and moistening the edges of the fibrous material
EP1936028A1 (en) Paper machine
DE102011006634A1 (en) Paper machine for producing e.g. paper web, has drying belt pressing web against heated sleeve surface of cylinder, where web unsupportedly runs from cylinder till transfer through another drying belt after guiding away of former belt
DE29924879U1 (en) Drying section for e.g. paper web has transfer point where components are slightly spaced apart and run at differing speeds
DE102004037119A1 (en) Drying section of papermaking industry plant, includes guidance units between corresponding series of drying cylinders

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20020222

AKX Designation fees paid

Free format text: DE FI SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FI SE

REF Corresponds to:

Ref document number: 50013082

Country of ref document: DE

Date of ref document: 20060810

Kind code of ref document: P

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: VOITH PATENT GMBH

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLAX Notice of opposition and request to file observation + time limit sent

Free format text: ORIGINAL CODE: EPIDOSNOBS2

26 Opposition filed

Opponent name: METSO PAPER, INC.

Effective date: 20070327

PLBB Reply of patent proprietor to notice(s) of opposition received

Free format text: ORIGINAL CODE: EPIDOSNOBS3

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20090312

Year of fee payment: 10

PLCK Communication despatched that opposition was rejected

Free format text: ORIGINAL CODE: EPIDOSNREJ1

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

27O Opposition rejected

Effective date: 20100416

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100326

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20190321

Year of fee payment: 20

Ref country code: DE

Payment date: 20190321

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 50013082

Country of ref document: DE

REG Reference to a national code

Ref country code: FI

Ref legal event code: MAE