EP0818573B1 - Process and apparatus for dewatering a paper web - Google Patents

Process and apparatus for dewatering a paper web Download PDF

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Publication number
EP0818573B1
EP0818573B1 EP97108063A EP97108063A EP0818573B1 EP 0818573 B1 EP0818573 B1 EP 0818573B1 EP 97108063 A EP97108063 A EP 97108063A EP 97108063 A EP97108063 A EP 97108063A EP 0818573 B1 EP0818573 B1 EP 0818573B1
Authority
EP
European Patent Office
Prior art keywords
paper web
press nip
press
belts
belt
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
EP97108063A
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German (de)
French (fr)
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EP0818573A2 (en
EP0818573A3 (en
Inventor
Wolfgang Mayer
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0818573A2 publication Critical patent/EP0818573A2/en
Publication of EP0818573A3 publication Critical patent/EP0818573A3/en
Application granted granted Critical
Publication of EP0818573B1 publication Critical patent/EP0818573B1/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
    • 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

Definitions

  • the invention relates to a method for dewatering a paper web Exposure to gas pressure, the paper web being passed between two belts through a press nip, and being in the press nip through a substantially across the Paper web directed gas flow moisture expelled from the paper web is, as well as a corresponding device.
  • Dewatering takes place in most paper machines Paper web after the wire section through mechanical dewatering so-called wet presses (generally roller presses or shoe presses) as well as with a subsequent contact drying in a single or double row Drying section. Dry contents are in the press section reached by approx. 50%.
  • a disadvantage of the known arrangement is the previous moistening one of the two felt webs, which on the one hand leads to an increased energy requirement and on the other hand, the effectiveness of drying if insufficient Reduced energy intake.
  • the invention is therefore based on the object, a method and a To create a device for dewatering a paper web, making a special high dryness in a gentle and energy-saving way when passing through can be achieved by a press nip without leaving after Press nip the risk of blistering or even delamination of the Paper web exists.
  • a first of the two belts, between which the paper web is passed through the press nip consists of a soft and slightly compressible material and as dry as possible Condition is brought up to the press nip and the second of the two belts a hard, relatively incompressible and water-absorbent material.
  • the first tape that is as dry as possible to the Press nip is brought up, strong in the press nip under the effect of the pressure compressed so that the inside contained air in the direction of the paper web and the second Tape evades and thus moisture from the paper web expels that from the second, water-absorbent tape is recorded.
  • At least the first volume or the roller over which the first belt is guided is heated.
  • the press nip can be formed by a shoe press. It is understood that here the counter roll of the shoe press roll as a suction roll can be trained.
  • FIG. 1 shows a device according to the invention as a whole number 10.
  • the device 10 comprises a shoe press which consists of a underlying shoe press roll 16 and an overhead Counter roll 18 is made.
  • a shoe press which consists of a underlying shoe press roll 16 and an overhead Counter roll 18 is made.
  • By the between the two rollers 16, 18 formed press nip 12 passes a paper web 14, the between an upper first band 20 and a lower, second Volume 22 is performed.
  • the first tape is made 20, which can also be formed as a felt tape as dry as possible, slightly compressible and soft Material.
  • FIG. 1 An additional Heating can be achieved like this through a heating element 24 for heating the first band 20 and by a heating element 26 for heating the counter roller 18 is shown in FIG. 1.
  • FIG. 2 A modification of the arrangement according to FIG. 1 is schematically shown in Fig. 2 and overall with the number Designated 50.
  • the paper web 14 passes through a press nip 52, that of an overhead shoe press roll 56 and one below it arranged suction roller 58 is formed.

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  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Entwässern einer Papierbahn durch Einwirkung eines Gasdruckes, wobei die Papierbahn zwischen zwei Bändern durch einen Preßspalt geführt wird, und wobei in Preßspalt durch einen im wesentlichen quer durch die Papierbahn gerichteten Gasstrom Feuchtigkeit aus der Papierbahn ausgetrieben wird, sowie eine entsprechende Vorrichtung.The invention relates to a method for dewatering a paper web Exposure to gas pressure, the paper web being passed between two belts through a press nip, and being in the press nip through a substantially across the Paper web directed gas flow moisture expelled from the paper web is, as well as a corresponding device.

Derartige Preßanordnungen sind aus der EP-A-0 304 561, bei der Wasserdampf durch die Bahn getrieben wird und aus der US-A-4 888 096, bei der Druckluft eingesetzt wird, bekannt. Nachteilig ist in beiden Fällen der relativ große Aufwand zur Erzeugung des Gasstromes.Such press arrangements are known from EP-A-0 304 561, in which water vapor is driven by the web and from US-A-4 888 096, in the compressed air is known. In both cases, the disadvantage is the relatively large outlay Generation of gas flow.

Zum Entwässern einer Papierbahn sind zahlreiche Vorrichtungen und Verfahren gebräuchlich. In den meisten Papiermaschinen erfolgt die Entwässerung der Papierbahn nach der Siebpartie durch eine mechanische Entwässerung in sogenannten Naßpressen (im allgemeinen Walzenpressen oder Schuhpressen) sowie mit einer nachfolgenden Kontakttrocknung in einer ein- oder zweireihigen Trockenpartie. Dabei werden in der Pressenpartie Trockengehalte von ca. 50 % erreicht.There are numerous devices and methods for dewatering a paper web common. Dewatering takes place in most paper machines Paper web after the wire section through mechanical dewatering so-called wet presses (generally roller presses or shoe presses) as well as with a subsequent contact drying in a single or double row Drying section. Dry contents are in the press section reached by approx. 50%.

Höhere Trockengehalte können in der Pressenpartie nur durch die sogenannte Impulstrocknung erreicht werden, wobei die Papierbahn in einem Nip, vorzugsweise einer Schuhpresse, soweit erhitzt wird, daß sich im Papier Wasserdampf bildet, der zum Austreiben des in der Bahn vorhandenen Wassers (Oberflächenwasser und Zwickelwasser) dient.Higher dry contents can only be achieved in the press section the so-called impulse drying can be achieved, the Paper web in a nip, preferably a shoe press, to the extent is heated that water vapor forms in the paper, which leads to Expulsion of the water present in the train (surface water and gusset water).

Ein wesentliches Problem bei diesem Trocknungsverfahren tritt beim Verlassen des Preßspaltes auf, da die Papierbahn in der Regel nur unvollständig getrocknet werden kann und infolge der stark erhöhten Temperatur zumindest ein Teil des enthaltenen Wassers verdampfen kann, was beim Verlassen des Preßspaltes zu einer plötzlichen Expansion und damit zur Blasenbildung führen kann, wodurch häufig der Faserzusammenhalt der Papierbahn zerstört wird. Es kommt also zum bekannten Effekt der Delamination.A major problem occurs with this drying process when leaving the press nip, since the paper web in the Usually can only be incompletely dried and as a result of greatly elevated temperature at least part of the contained Water can evaporate, what when leaving the press nip lead to sudden expansion and thus blistering can, which often causes the fiber cohesion of the paper web gets destroyed. So there is the known effect of delamination.

Aus der US-A-4 738 752 sind ein derartiges Verfahren und eine derartige Vorrichtung bekannt, womit eine deutlich verbesserte Trocknung bei hohem Druck im Preßspalt und bei Temperaturen bis zu 180 °C erfolgen soll. Dieses herkömmliche verfahren ist mit den zuvor bereits erwähnten Nachteilen behaftet.From US-A-4 738 752 such a method and a known device of this type, with which a significantly improved Drying at high pressure in the press nip and at temperatures up to 180 ° C. This conventional procedure is suffers from the disadvantages already mentioned.

Bei einem alternativen Verfahren gemäß der DE-A-4 216 114 wird die zu entwässernde Papierbahn zwischen zwei Preßfilzen durch einen Preßspalt geführt, wobei einer der beiden Preßfilze zuvor befeuchtet wird und bei Durchtritt durch den Preßspalt mit Hitze beaufschlagt wird, um somit Dampf zu erzeugen und zur Austreibung der Flüssigkeit aus der Papierbahn zu verwenden. In an alternative method according to DE-A-4 216 114 the paper web to be dewatered between two press felts guided a press nip, one of the two press felts previously is moistened and with passage through the press nip with heat is acted upon to generate steam and for expulsion to use the liquid from the paper web.

Ein Nachteil bei der bekannten Anordnung besteht in der vorherigen Befeuchtung einer der beiden Filzbahnen, was einerseits zu einem erhöhten Energiebedarf führt und andererseits die Wirksamkeit der Trocknung bei nicht ausreichender Energiezufuhr vermindert.A disadvantage of the known arrangement is the previous moistening one of the two felt webs, which on the one hand leads to an increased energy requirement and on the other hand, the effectiveness of drying if insufficient Reduced energy intake.

Der Erfindung liegt demnach die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Entwässern einer Papierbahn zu schaffen, womit ein besonders hoher Trockengehalt auf schonende und energiesparende Weise beim Durchtritt durch einen Preßspalt erreicht werden kann, ohne daß nach Verlassen des Preßspaltes die Gefahr einer Blasenbildung oder gar einer Delamination der Papierbahn besteht.The invention is therefore based on the object, a method and a To create a device for dewatering a paper web, making a special high dryness in a gentle and energy-saving way when passing through can be achieved by a press nip without leaving after Press nip the risk of blistering or even delamination of the Paper web exists.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein erstes der beiden Bänder, zwischen welchen die Papierbahn durch den Preßspalt geführt wird, aus einem weichen und leicht kompressiblen Material besteht und in möglichst trockenem Zustand an den Preßspalt herangeführt wird und das zweite der beiden Bänder aus einem harten, relativ inkompressiblen und wasseraufnahmefähigem Material besteht. This object is achieved according to the invention solved in that a first of the two belts, between which the paper web is passed through the press nip consists of a soft and slightly compressible material and as dry as possible Condition is brought up to the press nip and the second of the two belts a hard, relatively incompressible and water-absorbent material.

Auf diese Weise wird das erste Band, das in möglichst trockenem Zustand an den Preßspalt herangeführt wird, im Preßspalt unter Wirkung des Preßdruckes stark komprimiert, so daß die darin enthaltene Luft in Richtung auf die Papierbahn und auf das zweite Band ausweicht und somit Feuchtigkeit aus der Papierbahn austreibt, die von dem zweiten, wasseraufnahmefähigen Band aufgenommen wird.In this way, the first tape that is as dry as possible to the Press nip is brought up, strong in the press nip under the effect of the pressure compressed so that the inside contained air in the direction of the paper web and the second Tape evades and thus moisture from the paper web expels that from the second, water-absorbent tape is recorded.

Ohne zusätzliche äußere Maßnahmen wird auf diese Weise eine schonende Austreibung der Feuchtigkeit im Preßspalt erreicht und eine Blasenbildung außerhalb des Preßspaltes vermieden.In this way, without additional external measures gentle expulsion of moisture in the press nip is achieved and avoided blistering outside the press nip.

Um die Trocknungswirkung zu verbessern, wird in einer vorteilhaften Weiterbildung der Erfindung zumindest das erste Band oder die Walze, über die das erste Band geführt ist, beheizt.To improve the drying effect, is used in an advantageous Development of the invention at least the first volume or the roller over which the first belt is guided is heated.

Durch die Beheizung des ersten Bandes und/oder der Walze wird die durch Kompression des ersten Bandes bewirkte Luftströmung durch die Papierbahn in Richtung auf das zweite Band unterstützt und eine Austreibung der Feuchtigkeit in das zweite Band verbessert. Da nicht die Papierbahn selbst, sondern lediglich das erste Band und/oder ggf. die Walze, über die das erste Band geführt ist, beheizt werden, geschieht dies auf äußerst schonende Weise, da die Temperaturen bei diesem Vorgang in der Regel deutlich unterhalb von 100 °C bleiben. By heating the first belt and / or the roller the air flow caused by compression of the first band supported by the paper web towards the second belt and an expulsion of moisture into the second band improved. Because not the paper web itself, but only the first belt and / or possibly the roller over which the first belt is heated, this happens on extremely gentle Way, as the temperatures in this process usually stay well below 100 ° C.

Der Preßspalt kann in vorteilhafter Weiterbildung der Erfindung von einer Schuhpresse gebildet sein. Es versteht sich, daß hierbei die Gegenwalze der Schuhpreßwalze als Saugwalze ausgebildet sein kann.In an advantageous development of the invention, the press nip can be formed by a shoe press. It is understood that here the counter roll of the shoe press roll as a suction roll can be trained.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die Zeichnung. Es zeigen:

Fig. 1
eine erste Ausführung einer erfindungsgemäßen Vorrichtung zum Entwässern einer Papierbahn in schematischer Darstellung;
Fig. 2
eine Abwandlung der erfindungsgemäßen Vorrichtung in schematischer Darstellung.
Further features and advantages of the invention result from the following description of preferred exemplary embodiments with reference to the drawing. Show it:
Fig. 1
a first embodiment of an inventive device for dewatering a paper web in a schematic representation;
Fig. 2
a modification of the device according to the invention in a schematic representation.

In Fig. 1 ist eine erfindungsgemäße Vorrichtung insgesamt mit der Ziffer 10 bezeichnet.1 shows a device according to the invention as a whole number 10.

Die Vorrichtung 10 umfaßt eine Schuhpresse, die aus einer untenliegenden Schuhpreßwalze 16 und einer obenliegenden Gegenwalze 18 besteht. Durch den zwischen den beiden Walzen 16, 18 gebildeten Preßspalt 12 gelangt eine Papierbahn 14, die zwischen einem oberen ersten Band 20 und einem unteren, zweiten Band 22 geführt ist.The device 10 comprises a shoe press which consists of a underlying shoe press roll 16 and an overhead Counter roll 18 is made. By the between the two rollers 16, 18 formed press nip 12 passes a paper web 14, the between an upper first band 20 and a lower, second Volume 22 is performed.

Während das untere Band 22, das vorzugsweise als Filzband ausgeführt ist und aus einem relativ harten, inkompressiblen, wasseraufnahmefähigen Material besteht, besteht das erste Band 20, das gleichfalls als Filzband ausgebildet sein kann, aus einem möglichst trockenen, leicht kompressiblen und weichen Material.While the lower band 22, which is preferably a felt band and is made of a relatively hard, incompressible, water-absorbent material, the first tape is made 20, which can also be formed as a felt tape as dry as possible, slightly compressible and soft Material.

In Fig. 1 ist die Breite des Bandes 20 bewußt übertrieben dargestellt, um diesen Unterschied zwischen den beiden Bändern zu verdeutlichen. Im Preßspalt 12 werden beide Bänder 20, 22 zusammengepreßt, wobei das erste Band 20 infolge seiner Nachgiebigkeit eine große Volumenänderung erfährt und das zweite Band 22 infolge seiner schlechten Nachgiebigkeit nur eine geringe Volumenänderung erfährt. Folglich wird somit im ersten Band 20 enthaltene Luft aus diesem Band schlagartig ausgepreßt und gelangt durch die Papierbahn 14 in Richtung der Pfeile 28 zum zweiten Band 22 und treibt dabei Feuchtigkeit aus der Papierbahn 14 aus.In Fig. 1, the width of the band 20 is deliberately exaggerated shown this difference between the two bands to clarify. In the press nip 12, both bands 20, 22nd pressed together, the first band 20 due to its compliance undergoes a large volume change and the second Volume 22 due to its poor compliance only a small one Changes in volume. Consequently, in the first volume 20 air contained in this tape is suddenly squeezed out passes through the paper web 14 in the direction of arrows 28 to second band 22 and drives moisture out of the paper web 14 out.

Somit ergibt sich auf einfache Weise eine besonders schonende Trocknung mit erhöhtem Trockengehalt. This results in a particularly gentle way in a simple manner Drying with increased dryness.

Eine Verbesserung der Trocknungswirkung kann durch eine zusätzliche Beheizung erreicht werden, wie dies durch ein Heizelement 24 zur Beheizung des ersten Bandes 20 und durch ein Heizelement 26 zur Beheizung der Gegenwalze 18 in Fig. 1 dargestellt ist.An additional Heating can be achieved like this through a heating element 24 for heating the first band 20 and by a heating element 26 for heating the counter roller 18 is shown in FIG. 1.

Durch diese zusätzlichen Heizelemente wird der Dampfdruck der in der Papierbahn 14 enthaltenen Flüssigkeit erhöht, was zur Austreibung der Flüssigkeit im Preßspalt 12 beiträgt.Through these additional heating elements, the vapor pressure of the liquid contained in the paper web 14 increases, which leads to Expulsion of the liquid in the press nip 12 contributes.

Infolge der wirksamen Unterstützung durch den Gasstrom können hierbei die Temperaturen deutlich unterhalb 100 °C gehalten werden, so daß insgesamt eine schonende und wirkungsvolle Trocknung erreicht wird.As a result of the effective support from the gas flow, can the temperatures kept well below 100 ° C be, so that overall a gentle and effective Drying is achieved.

Eine Abwandlung der Anordnung gemäß Fig. 1 ist schematisch in Fig. 2 dargestellt und insgesamt mit der Ziffer 50 bezeichnet. A modification of the arrangement according to FIG. 1 is schematically shown in Fig. 2 and overall with the number Designated 50.

Hierbei gelangt die Papierbahn 14 durch einen Preßspalt 52, der von einer oben liegenden Schuhpreßwalze 56 und einer darunter angeordneten Saugwalze 58 gebildet ist.Here, the paper web 14 passes through a press nip 52, that of an overhead shoe press roll 56 and one below it arranged suction roller 58 is formed.

Durch die Saugwalze 58 wird ein in Richtung der Pfeile 28 gerichteter Gasstrom durch das erste Band 60, die Papierbahn 14 und das zweite Band 62 erreicht, was zu einem wirkungsvollen Durchströmen der Papierbahn 14 und zu einer schonenden Abführung von enthaltener Feuchtigkeit führt.By the suction roller 58 in the direction of arrows 28 directed gas flow through the first belt 60, the paper web 14 and the second band 62 reached, resulting in an effective Flow through the paper web 14 and for a gentle discharge of contained moisture.

Claims (6)

  1. Method for dewatering a paper web by the action of gas pressure, the paper web (14) being lead through a press nip (12; 52) between two belts (20, 22; 60, 62) and, in the press nip (12; 52), moisture being driven out of the paper web (14) by a gas stream directed substantially transversely through the paper web (14), characterized in that a first (20; 60) of the two belts consists of a soft and easily compressible material and is lead up to the press nip in the driest possible state, and the second (22; 62) of the two belts consists of a hard, relatively incompressible material that is capable of absorbing water.
  2. Method according to Claim 1, characterized in that at least the first belt (20) or a roll (18) that is involved in the press nip and over which the first belt (20) is guided, is heated.
  3. Apparatus for dewatering a paper web, in particular for carrying out the method according to one or more of the preceding claims, having a press nip (12; 52) through which a paper web (14) is guided enclosed between two belts (20, 22; 60, 62), there being means for producing in the press nip (12; 52) a gas stream directed substantially transversely through the paper web (14), characterized in that a first (20; 60) of the two belts consists of a soft and easily compressible material and is lead up to the press nip in the driest possible state, and the second (22; 62) of the two belts consists of a hard, relatively incompressible material that can absorb water.
  4. Apparatus according to Claim 3, characterized in that the press nip (12; 52) is formed by a shoe press (16, 18; 56; 58).
  5. Apparatus according to Claim 4, characterized in that the press nip (52) is formed by a shoe-press roll (56) which cooperates with a suction roll (58).
  6. Apparatus according to one or more of Claims 3 to 5, characterized in that a heating device (24, 26) is provided to heat at least the first belt (20) or a roll (18) which is involved in the press nip and over which the first belt (20) is guided.
EP97108063A 1996-07-11 1997-05-17 Process and apparatus for dewatering a paper web Expired - Lifetime EP0818573B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19627890 1996-07-11
DE19627890A DE19627890A1 (en) 1996-07-11 1996-07-11 Method and device for dewatering a paper web

Publications (3)

Publication Number Publication Date
EP0818573A2 EP0818573A2 (en) 1998-01-14
EP0818573A3 EP0818573A3 (en) 1999-01-13
EP0818573B1 true EP0818573B1 (en) 2002-08-21

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EP97108063A Expired - Lifetime EP0818573B1 (en) 1996-07-11 1997-05-17 Process and apparatus for dewatering a paper web

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EP (1) EP0818573B1 (en)
CA (1) CA2210653A1 (en)
DE (2) DE19627890A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000006825A1 (en) * 1998-07-27 2000-02-10 Lefkowitz Leonard R Air pumping belt
DE19946971A1 (en) 1999-09-30 2001-04-05 Voith Paper Patent Gmbh Device for dewatering a material web
DE19946986A1 (en) * 1999-09-30 2001-04-05 Voith Paper Patent Gmbh Press section of a papermaking or cardboard prodn machine has at least one water extraction station where water is forced out of the web by gas in a pressure zone
DE19946979A1 (en) * 1999-09-30 2001-04-05 Voith Paper Patent Gmbh Assembly for the extraction of water from a wet paper/cardboard web has a support roller facing a blower box to carry the web through between a lower blanket and an upper membrane covered by a perforated belt
DE10304575A1 (en) * 2003-02-05 2004-08-19 Voith Paper Patent Gmbh Press gap, to extract water from a wet web, of paper/cardboard/tissue, has compressed air channels in the counter roller mantle to form an air cushion over the web at the press roller mantle recess
US20230295871A1 (en) * 2022-02-11 2023-09-21 David Beck Displacement dewatering a web using compressed gas

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI71180C (en) * 1983-05-12 1986-11-24 Valmet Oy PRESSVALS FOER PAPER MACHINES SOM AER FOERSEDD MED EN ELASTISK YTBELAEGGNING AV SKIKTKONSTRUKTION SAMT PRESS FOER PAPPERSMASKIN DAER DET ANVAENDS EN IFRAOGAVARANDE PRESSVALS
DE3728124A1 (en) * 1987-08-22 1989-03-02 Escher Wyss Gmbh DRAINAGE PRESS WITH STEAM FEED
US4888096A (en) * 1987-12-02 1989-12-19 Inotech Process Ltd. Roll press for removing water from a web of paper using solid grooved roll and compressed air
US5082533A (en) * 1990-04-10 1992-01-21 Beloit Corporation Heated extended nip press with porous roll layers
JP2960999B2 (en) * 1991-09-04 1999-10-12 三菱重工業株式会社 Wet paper transfer device
US5700356A (en) * 1996-01-19 1997-12-23 Lefkowitz; Leonard R. Air permeable belt for dewatering web in press nip

Also Published As

Publication number Publication date
DE59708001D1 (en) 2002-09-26
EP0818573A2 (en) 1998-01-14
EP0818573A3 (en) 1999-01-13
CA2210653A1 (en) 1998-01-11
DE19627890A1 (en) 1998-01-15

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