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EP0653513B1 - Process for drying a paper web and dryer section of a papermachine - Google Patents

Process for drying a paper web and dryer section of a papermachine Download PDF

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Publication number
EP0653513B1
EP0653513B1 EP94116045A EP94116045A EP0653513B1 EP 0653513 B1 EP0653513 B1 EP 0653513B1 EP 94116045 A EP94116045 A EP 94116045A EP 94116045 A EP94116045 A EP 94116045A EP 0653513 B1 EP0653513 B1 EP 0653513B1
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EP
European Patent Office
Prior art keywords
drying
paper web
speed
cylinder
dryer
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
EP94116045A
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German (de)
French (fr)
Other versions
EP0653513A2 (en
EP0653513A3 (en
Inventor
Robert L. Salter
Hans-Peter Dr. Sollinger
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.)
JM Voith SE and Co KG
Original Assignee
JM Voith GmbH and Co Beteiligungen KG
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Publication date
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Publication of EP0653513A2 publication Critical patent/EP0653513A2/en
Publication of EP0653513A3 publication Critical patent/EP0653513A3/en
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Publication of EP0653513B1 publication Critical patent/EP0653513B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders 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
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/02—Mechanical driving arrangements

Definitions

  • the invention relates to a method for drying a Paper web according to the preamble of claim 1 and one Dryer section according to the preamble of claim 5.
  • Dryer sections in which the paper web alternates wraps around an upper drying cylinder, and then immediately afterwards a lower drying cylinder, see above that from cylinder to cylinder alternately one and the other other side of the paper web direct cylinder contact Has.
  • the train should be at the highest Working speeds with the greatest security through the Run the machine through. As far as possible, none should Web breaks occur.
  • the drying should be as possible be intense so that a certain one, in the paper web amount of water contained in the smallest possible way is driven out so that the overall length of the dryer section can be kept as small as possible.
  • these mentioned properties - high runability and high energy density - there are other requirements to the mentioned method or to the mentioned Dryer section. It is very important for some types of paper gentle drying in order to achieve certain paper properties influence. Above all, this included avoiding Shrink folds.
  • the invention has for its object a method or a dryer section of the genera mentioned shape that the energy density and thus the intensity drying can be increased significantly without other disadvantages occur. At the same time a Procedures are specified with which sensitive Allow papers to dry particularly gently.
  • the inventors recognized that the first subtask can be solved in that the peripheral speed at least one or more drying cylinders higher is measured as the speed of the paper web.
  • Differential speed between the lateral surface of the Drying cylinder on the one hand and the paper web on the other is the amount of heat that the surface of the paper web provides, correspondingly larger than at identical speeds.
  • the inventors also recognized that the second Partial task can be solved in that the Peripheral speed of at least one or more Drying cylinder is dimensioned smaller than that Speed of the paper web. This means that the concerned drying cylinder rotates more slowly than that Paper web, and that again a certain amount of sliding or grinding the paper web on the outer surface of the concerned drying cylinder takes place.
  • This Sprayer was dispensing a spray agent at very short notice, that is the static friction between the running web on the one hand and the outer surface of the drying cylinder in question on the other hand, so that it slides. Once a sliding state has occurred, it would this can be maintained even without continuing Spray is added.
  • the spray can either on the paper web, or on the outer surface of the Drying cylinder, or in the wedge-shaped inlet gap can be entered between these two.
  • the dryer section comprises seven dryer groups I to V.
  • Each dryer group has its own support belt 1 to 5 as well as a number of drying cylinders 10 and a number of Deflection suction rollers 11, furthermore the usual others Guide rollers 13 for guiding, tensioning and regulating endless support strap loop.
  • Horizontal are shown Drying cylinder series; however, vertical or inclined rows of cylinders are provided.
  • Each of the Drying groups I-V have their own drive.
  • At least one of the represented dryer groups I to V at least one of the Cylinder driven at such a speed that the Peripheral speed of this cylinder ("quick cylinder") is greater than the speed of the paper web 9.
  • the other cylinders have the same Peripheral speed, like the dryer fabric. Due to the Difference speed between the concerned Rapid cylinder and the paper web come to a Sliding or grinding the paper web. Because every Surface element of the paper web with several surface elements the lateral surface of the quick cylinder in question When touched, more heat is transferred to the paper web brought up so that there is a more intensive drying of the Paper web is coming.
  • dryer group I three cylinders 10 are conventionally driven, ie they have the same peripheral speed as paper web 9.
  • the first cylinder 10A is over one Gearbox G and via a drive shaft 32 with increased Speed driven.
  • the other cylinders 10B however, have the same in a conventional manner Peripheral speed, such as the paper web 9.
  • the first two have Cylinder 10C does not have its own drive, but is powered by Paper web 9 taken away.
  • the third and fourth cylinders 10D are conventionally powered, i.e. with the same Peripheral speed, like the paper web.
  • the last Cylinder 10E on the other hand, has its own engine M 'which drives it drives at increased speed.
  • the first cylinder 10C has none own drive.
  • the second cylinder 10F is conventional i.e. with normal peripheral speed, driven.
  • the third cylinder 10G has one opposite the paper web increased speed.
  • the fourth drying cylinder has 10H normal speed again.
  • the cylinders 10F, 10G, 10H are coupled to each other via gears. Cylinder 10G has a smaller drive gear than cylinders 10F and 10H.
  • dryer group V the only cylinder is 10 conventional, i.e. at the same peripheral speed driven like the paper web 9.
  • the one or more quick cylinder at the beginning of Dryer section, in the middle, or at the end of the dryer section to arrange can be appropriate.
  • Drying group III with one or more high-speed cylinders be equipped, while the other dryer groups with normal running cylinders are provided.
  • the respective quick cylinder either on Beginning, in the middle, or at the end of the concerned Arrange dryer group.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

A process for drying a paper web and a drying section of a paper making machine. The drying section includes at least one drying group comprised of a plurality of drying cylinders, each at least partially wrapped by a web to be dried. The drying cylinders having peripheral surfaces heated for drying the web moving therepast. The peripheral surfaces of the drying cylinders in the drying groups are rotated at the velocity of the web along the web path. At least one of the drying cylinders in at least one drying group is driven to rotate at a speed that is different than the speed of the web moving past the at least one cylinder. The at least one cylinder may be selectively driven to rotate faster or slower than the speed of the web moving therepast, which applies more heat to the paper web. The invention is adaptable for a single tier drying section and/or for a double tier drying sections or for other drying section arrangements. The operation of a drying cylinder at a different speed than the other cylinders is useful for one or more than one drying cylinder in a drying group and where a drying section is comprised of more than one drying group, is useful for a drying cylinder in one or more of the drying groups.

Description

Die Erfindung betrifft ein Verfahren zum Trocknen einer Papierbahn gemäß dem Oberbegriff von Anspruch 1 sowie eine Trockenpartie gemäß dem Oberbegriff von Anspruch 5.The invention relates to a method for drying a Paper web according to the preamble of claim 1 and one Dryer section according to the preamble of claim 5.

Es gibt eine große Zahl von Druckschriften, die sich mit dem technischen Sachgebiet befassen. Nur beispielshalber wird auf DE-GM 92 07 656 (= US No.07/931,261) verwiesen die ein Verfahren und eine Trockenpartie gemäß den Oberhegriffen der Ansprüche 1 und 5 zeigt. Dabei handelt es sich um eine Trockenpartie einer Papiermaschine mit mehreren, aufeinander folgenden Trockengruppen. Jede einzelne Trockengruppe ist einreihig, d.h. sie umfaßt eine einzige Reihe von Trockenzylindern, und zwischen je zwei einander benachbarten Trockenzylindern befindet sich eine Umlenksaugwalze. Ein einziges endloses Stützband umschlingt abwechselnd einen Trockenzylinder und eine Umlenksaugwalze, wobei die zu trocknende Papierbahn in direkten Kontakt mit den Trockenzylindern, und das Stützband in direkten Kontakt mit den Umlenksaugwalzen gelangt. Dabei wird in ein und derselben Trockengruppe nur die eine Seite der Papierbahn getrocknet. Um auch die andere Seite zu trocknen, folgt eine weitere Trockengruppe, in welcher die Papierbahn mit ihrer anderen Seite in direkten Kontakt mit den Trockenzylindern gelangt.There are a large number of publications that deal with deal with the technical subject area. For example only reference is made to DE-GM 92 07 656 (= US No.07 / 931,261) a process and a dryer section according to the upper handles of the Claims 1 and 5 shows. It is a dryer section of a Paper machine with several, successive Dry groups. Every single drying group is single-row, i.e. it comprises a single row of drying cylinders, and between two adjacent drying cylinders there is a deflection suction roll. One endless Support belt alternately wraps around a drying cylinder and a deflection suction roll, the paper web to be dried in direct contact with the drying cylinders, and that Support belt in direct contact with the deflection suction rolls reached. It is only in the same drying group one side of the paper web dried. To also the drying another side, another drying group follows, in which the paper web with its other side in comes into direct contact with the drying cylinders.

Neben diesen einreihigen Trockenpartien gibt es aber auch Trockenpartien, bei welchen die Papierbahn abwechselnd einen oberen Trockenzylinder umschlingt, und sodann unmittelbar darauffolgend einen unteren Trockenzylinder, so daß von Zylinder zu Zylinder abwechselnd die eine und die andere Seite der Papierbahn unmittelbaren Zylinderkontakt hat. In addition to these single-tier dryer sections, there are also Dryer sections in which the paper web alternates wraps around an upper drying cylinder, and then immediately afterwards a lower drying cylinder, see above that from cylinder to cylinder alternately one and the other other side of the paper web direct cylinder contact Has.

Beide Arten von Trockenpartien, also die einreihige wie auch die zweireihige, kommen bei der folgenden Erfindung in Betracht.Both types of dryer sections, so the single row like also the double row come in in the following invention Consideration.

An das eingangs genannte Verfahren bzw. an die eingangs genannte Trockenpartie werden die folgenden Anforderungen gestellt: Die Bahn soll bei höchsten Arbeitsgeschwindigkeiten mit größter Sicherheit durch die Maschine hindurch laufen. Dabei sollen möglichst keinerlei Bahnabrisse auftreten. Die Trocknung soll möglichst intensiv sein, so daß eine bestimmte, in der Papierbahn enthaltene Wassermenge auf möglichst kleinem Wege ausgetrieben wird, so daß die Baulänge der Trockenpartie möglichst klein gehalten werden kann. Außer diesen genannten Eigenschaften - hohe Laufsicherheit (runability) und hohe Energiedichte - gibt es noch weitere Anforderungen an das genannte Verfahren bzw. an die genannte Trockenpartie. Ganz wichtig ist bei manchen Papiersorten eine schonende Trocknung, um gewisse Papiereigenschaften zu beeinflussen. Dazu gehörte vorallem das Vermeiden von Schrumpffalten.To the method mentioned at the beginning or to the input Dryer section mentioned meet the following requirements provided: The train should be at the highest Working speeds with the greatest security through the Run the machine through. As far as possible, none should Web breaks occur. The drying should be as possible be intense so that a certain one, in the paper web amount of water contained in the smallest possible way is driven out so that the overall length of the dryer section can be kept as small as possible. Except these mentioned properties - high runability and high energy density - there are other requirements to the mentioned method or to the mentioned Dryer section. It is very important for some types of paper gentle drying in order to achieve certain paper properties influence. Above all, this included avoiding Shrink folds.

Im vorliegenden Falle soll dem ersten Erfordernis, nämlich der möglichst hohen Energiedichte und damit der raschen und intensiven Trocknung, besondere Aufmerksamkeit gewidmet werden. Ein bekanntes Mittel, auf kleinem Weg der Papierbahn hohe Feuchtigkeitsmengen aus dem Papier zu verdampfen, besteht darin, die Temperatur der einzelnen Trockenzylindermäntel zu steigern. Dem sind jedoch Grenzen gesetzt, die in der Festigkeit des Materiales der Trockenzylinder liegen. Außer dem genannten ersten Erfordernis soll auch dem zweiten Erfordernis Aufmerksamkeit gewidmet werden, nämlich der schonenden Trocknung.In the present case, the first requirement, namely the highest possible energy density and thus the rapid and intensive drying, special attention become. A well-known means, in a small way Paper web high amounts of moisture from the paper too evaporate is the temperature of each To increase drying cylinder jackets. However, there are limits set in the strength of the material of the Drying cylinders lie. Except for the first mentioned Requirement should also meet the second requirement Attention should be paid, namely the gentle Drying.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren bzw. eine Trockenpartie der genannten Gattungen derart zu gestalten, daß die Energiedichte und damit die Intensität des Trocknens wesentlich gesteigert werden kann, ohne daß sonstige Nachteile auftreten. Gleichzeitig soll ein Verfahren angegeben werden, mit welchem sich empfindliche Papiere besonders schonend trocknen lassen.The invention has for its object a method or a dryer section of the genera mentioned shape that the energy density and thus the intensity drying can be increased significantly without other disadvantages occur. At the same time a Procedures are specified with which sensitive Allow papers to dry particularly gently.

Diese Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1 bzw. 5 gelöst.This task is characterized by the characteristics of the Claims 1 and 5 solved.

Die Erfinder haben erkannt, daß die erste Teilaufgabe dadurch gelöst werden kann, daß die Umfangsgeschwindigkeit wenigstens eines oder mehrerer Trockenzylinder höher bemessen wird, als die Geschwindigkeit der Papierbahn. Dies bedeutet, daß der betreffende Trockenzylinder schneller umläuft, als die Papierbahn, und daß somit ein gewisses Gleiten oder Schleifen der Papierbahn auf der Mantelfläche des betreffenden Trockenzylinders erfolgt. Dabei haben die Erfinder vor allem erkannt, daß dies möglich ist, ohne daß es zu Komplikationen kommt, vor allem nicht zu Abrissen der Papierbahn. Durch Anwendung der genannten Differenzgeschwindigkeit zwischen der Mantelfläche des Trockenzylinders einerseits und der Papierbahn andererseits ist das Wärmeangebot, das die Mantelfläche der Papierbahn zur Verfügung stellt, entsprechend größer, als bei identischen Geschwindigkeiten.The inventors recognized that the first subtask can be solved in that the peripheral speed at least one or more drying cylinders higher is measured as the speed of the paper web. This means that the drying cylinder in question is faster rotates as the paper web, and that therefore a certain Sliding or grinding the paper web on the outer surface of the drying cylinder concerned. They have Inventors especially recognized that this is possible without there are complications, especially not demolition of the Paper web. By applying the above Differential speed between the lateral surface of the Drying cylinder on the one hand and the paper web on the other is the amount of heat that the surface of the paper web provides, correspondingly larger than at identical speeds.

Die Erfinder haben ferner erkannt, daß die zweite Teilaufgabe dadurch gelöst werden kann, daß die Umfangsgeschwindigkeit wenigstens eines oder mehrerer Trockenzylinder geringer bemessen wird, als die Geschwindigkeit der Papierbahn. Dies bedeutet, daß der betreffende Trockenzylinder langsamer umläuft als die Papierbahn, und daß somit wiederum ein gewisses Gleiten oder Schleifen der Papierbahn auf der Mantelfläche des betreffenden Trockenzylinders erfolgt. The inventors also recognized that the second Partial task can be solved in that the Peripheral speed of at least one or more Drying cylinder is dimensioned smaller than that Speed of the paper web. This means that the concerned drying cylinder rotates more slowly than that Paper web, and that again a certain amount of sliding or grinding the paper web on the outer surface of the concerned drying cylinder takes place.

Weitere Maßnahmen können zweckmäßig sein, um die Erfindung besonders gut anwenden zu können. So ist es denkbar, die Mantelflächen der betreffenden Trockenzylinder mit einer Beschichtung zu versehen, die den Reibungskoeffizienten gegenüber der Papierbahn (bzw. gegenüber dem Stützband) herabsetzt. Auch ist es denkbar, die Differenzgeschwindigkeit erst dann herzustellen, wenn die Trockenpartie eine gewisse Zeitspanne, z.B. einige Minuten, in Betrieb war. Um den Übergang vom Betrieb mit identischen Geschwindigkeiten zu Differenzgeschwindigkeiten zu erleichtern, könnte beispielsweise vor derjenigen Stelle, an welcher die Papierbahn bzw. das Stützgewebe auf die Mantelfläche des Trockenzylinders aufläuft, ein Sprühorgan zum Aufbringen eines Gleitmittels vorgesehen werden. Dieses Sprühorgan wurde ganz kurzfristig ein Sprühmittel abgeben, das die Haftreibung zwischen der laufenden Bahn einerseits und der Mantelfläche des betreffenden Trockenzylinders andererseits herabsetzt, so daß es zu einem Gleiten kommt. Ist erst einmal ein Gleitezustand eingetreten, so würde dieser beibehalten werden können, auch ohne daß weiterhin Sprühmittel zugesetzt wird. Dabei kann das Sprühmittel entweder auf die Papierbahn, oder auf die Mantelfläche des Trockenzylinders, oder in den keilförmigen Einlaufspalt zwischen diesen beiden eingegeben werden.Further measures may be appropriate to the invention to be able to use particularly well. So it is conceivable that Shell surfaces of the drying cylinders in question with a Coating to provide the coefficient of friction towards the paper web (or towards the support belt) belittles. It is also conceivable that Differential speed to produce only when the Dryer section for a certain period of time, e.g. a few minutes, was in operation. To transition from operating with identical Speeds to differential speeds too could facilitate, for example, in front of the position on which the paper web or the support fabric on the The outer surface of the drying cylinder runs open, a spray element be provided for applying a lubricant. This Sprayer was dispensing a spray agent at very short notice, that is the static friction between the running web on the one hand and the outer surface of the drying cylinder in question on the other hand, so that it slides. Once a sliding state has occurred, it would this can be maintained even without continuing Spray is added. The spray can either on the paper web, or on the outer surface of the Drying cylinder, or in the wedge-shaped inlet gap can be entered between these two.

Die Erfindung ist anhand der Zeichnung näher erläutert.The invention is explained in more detail with reference to the drawing.

In der Figur erkennt man zunächst eine Presse P, die zwei miteinander einen Preßspalt bildende Preßwalzen 18 und 19 aufweist. Die herzustellenden Papierbahn 9 läuft durch diesen Preßspalt zusammen mit einem Entwässerungsfilz 17. Diese Presse P ist die letzte Presse einer Pressenpartie, deren übrige Teile in der Zeichnung nicht dargestellt sind. Die Presse P hat einen nur schematisch dargestellten Antrieb 30. In the figure one can first see a press P, the two press rolls 18 and 19 forming a press nip with one another having. The paper web 9 to be produced runs through this press nip together with a drainage felt 17th This press P is the last press of a press section, the remaining parts are not shown in the drawing. The press P has one shown only schematically Drive 30.

Die Trockenpartie umfaßt sieben Trockengruppen I bis V. Jede Trockengruppe hat ein ihr eigenes Stützband 1 bis 5 sowie eine Reihe von Trockenzylindern 10 und eine Reihe von Umlenksaugwalzen 11, ferner die üblichen weiteren Leitwalzen 13 zum Führen, Spannen und Regulieren der endlosen Stützband-Schlaufe. Dargestellt sind horizontale Trockenzylinder-Reihen; jedoch können auch vertikale oder geneigte Zylinder-Reihen vorgesehen werden. Jede der Trockengruppen I-V hat einen ihr eigenen Antrieb.The dryer section comprises seven dryer groups I to V. Each dryer group has its own support belt 1 to 5 as well as a number of drying cylinders 10 and a number of Deflection suction rollers 11, furthermore the usual others Guide rollers 13 for guiding, tensioning and regulating endless support strap loop. Horizontal are shown Drying cylinder series; however, vertical or inclined rows of cylinders are provided. Each of the Drying groups I-V have their own drive.

Gemäß der Erfindung ist in wenigstens einer der dargestellten Trockengruppen I bis V wenigstens einer der Zylinder mit einer solchen Drehzahl angetrieben, daß die Umfangsgeschwindigkeit dieses Zylinders ("Schnellzylinder") größer als die Geschwindigkeit der Papierbahn 9 ist. Die übrigen Zylinder haben hingegen dieselbe Umfangsgeschwindigkeit, wie das Trockensieb. Aufgrund der Differenzgeschwindigkeit zwischen dem betreffenden Schnellzylinder und der Papierbahn kommt es zu einem Gleiten oder Schleifen der Papierbahn. Da jedes Flächenelement der Papierbahn mit mehreren Flächenelementen der Mantelfläche des betreffenden Schnellzylinders in Berührung gelangt, wird mehr Wärme an die Papierbahn herangeführt, so daß es zu einer intensiveren Trocknung der Papierbahn kommt.According to the invention in at least one of the represented dryer groups I to V at least one of the Cylinder driven at such a speed that the Peripheral speed of this cylinder ("quick cylinder") is greater than the speed of the paper web 9. The other cylinders, however, have the same Peripheral speed, like the dryer fabric. Due to the Difference speed between the concerned Rapid cylinder and the paper web come to a Sliding or grinding the paper web. Because every Surface element of the paper web with several surface elements the lateral surface of the quick cylinder in question When touched, more heat is transferred to the paper web brought up so that there is a more intensive drying of the Paper web is coming.

Bei der dargestellten Trockenpartie ist die folgende Konstellation denkbar:
In der Trockengruppe I sind drei Zylinder 10 konventionell angetrieben, d.h. sie haben dieselbe Umfangsgeschwindigkeit, wie die Papierbahn 9.The following constellation is conceivable for the dryer section shown:
In dryer group I, three cylinders 10 are conventionally driven, ie they have the same peripheral speed as paper web 9.

In der Trockengruppe II ist der erste Zylinder 10A über ein Getriebe G und über eine Antriebswelle 32 mit erhöhter Geschwindigkeit angetrieben. Die weiteren Zylinder 10B hingegen haben in konventioneller Weise dieselbe Umfangsgeschwindigkeit, wie die Papierbahn 9. In dryer group II, the first cylinder 10A is over one Gearbox G and via a drive shaft 32 with increased Speed driven. The other cylinders 10B however, have the same in a conventional manner Peripheral speed, such as the paper web 9.

In der dritten Trockengruppe haben die beiden ersten Zylinder 10C keinen eigenen Antrieb, sondern werden von der Papierbahn 9 mitgenommen. Der dritte und vierte Zylinder 10D sind konventionell angetrieben, d.h. mit derselben Umfangsgeschwindigkeit, wie die Papierbahn. Der letzte Zylinder 10E hingegen hat einen eigenen Motor M', der ihn mit erhöhter Geschwindigkeit antreibt.In the third drying group, the first two have Cylinder 10C does not have its own drive, but is powered by Paper web 9 taken away. The third and fourth cylinders 10D are conventionally powered, i.e. with the same Peripheral speed, like the paper web. The last Cylinder 10E, on the other hand, has its own engine M 'which drives it drives at increased speed.

In Trockengruppe IV hat der erste Zylinder 10C keinen eigenen Antrieb. Der zweite Zylinder 10F ist konventionell, d.h. mit normaler Umfangsgeschwindigkeit, angetrieben. Der dritte Zylinder 10G hat eine gegenüber der Papierbahn erhöhte Geschwindigkeit. Der vierte Trockenzylinder 10H hat wieder eine normale Geschwindigkeit. Die Zylinder 10F, 10G, 10H sind über Zahnräder aneinander gekoppelt. Zylinder 10G hat ein kleineres Antriebs-Zahnrad als die Zylinder 10F und 10H.In dryer group IV, the first cylinder 10C has none own drive. The second cylinder 10F is conventional i.e. with normal peripheral speed, driven. The third cylinder 10G has one opposite the paper web increased speed. The fourth drying cylinder has 10H normal speed again. The cylinders 10F, 10G, 10H are coupled to each other via gears. Cylinder 10G has a smaller drive gear than cylinders 10F and 10H.

In Trockengruppe V ist der einzige Zylinder 10 konventionell, d.h. mit derselben Umfangsgeschwindigkeit angetrieben, wie die Papierbahn 9.In dryer group V the only cylinder is 10 conventional, i.e. at the same peripheral speed driven like the paper web 9.

Es gibt zahlreiche Varianten der Erfindung. So kann es zweckmäßig sein, den bzw. die Schnellzylinder am Anfang der Trockenpartie, in der Mitte, oder am Ende der Trockenpartie anzuordnen. So könnte beispielsweise allein die Trockengruppe III mit einem oder mehreren Schnellzylindern ausgestattet sein, während die übrigen Trockengruppen mit normal laufenden Zylindern versehen sind.There are numerous variants of the invention. It can be appropriate, the one or more quick cylinder at the beginning of Dryer section, in the middle, or at the end of the dryer section to arrange. For example, that alone Drying group III with one or more high-speed cylinders be equipped, while the other dryer groups with normal running cylinders are provided.

Auch kann es zweckmäßig sein, innerhalb der einzelnen Trockengruppe den betreffenden Schnellzylinder entweder am Anfang, in der Mitte, oder am Ende der betreffenden Trockengruppe anzuordnen.It may also be appropriate within the individual Drying group the respective quick cylinder either on Beginning, in the middle, or at the end of the concerned Arrange dryer group.

Entscheidend ist, daß gemäß der Erfindung bewußt eine Differenz zwischen der Umfangsgeschwindigkeit eines Trockenzylinders oder mehrerer Trockenzylinder einerseits, und der Papierbahn hergestellt wird. Diese Differenz braucht nur ganz wenige Prozente zu betragen, sie kann aber auch 5 %, 7 %, 10 %, und im Extremfall sogar 20 oder 30 % betragen.It is crucial that according to the invention a deliberately Difference between the peripheral speed of a Drying cylinders or several drying cylinders on the one hand, and the paper web is produced. That difference only needs to be a few percent, but it can also 5%, 7%, 10%, and in extreme cases even 20 or 30% be.

Claims (8)

  1. Method of drying a paper web (9), wherein the paper web is looped around the jacket surfaces of steam heated, rotatably journalled dryer cylinders (10), characterized in that the peripheral speed of at least one dryer cylinder (10) differs from the speed of the paper web (9) or of the support fabric (2, 3, 4) carrying the paper web.
  2. Method in accordance with claim 1, characterized in that the peripheral speed of at least one dryer cylinder (10A, 10C) is higher than the speed of the paper web (9) or of a support fabric (2, 3, 4) carrying the paper web.
  3. Method in accordance with claim 1, characterized in that the peripheral speed of at least one dryer cylinder (10G) is lower than the speed of the paper web (9) or of a support fabric (2, 3, 4) carrying the paper web.
  4. Method in accordance with one of the claims 1 to 3, characterized in that the difference between the peripheral speed of the relevant cylinder (10A, 10E, 10G) is adjustable during the operation.
  5. Dryer section of a paper machine having the following features:
    5.1 a plurality of heated dryer cylinders (10) which are arranged in series;
    5.2 a support fabric which loops around the dryer cylinders (10), with the paper web (9) being covered in sandwich-like manner, at least with respect to some dryer cylinders (10), between their jacket surfaces and the support fabric (2, 3, 4);
    5.3 at least some of the dryer cylinders (10) are provided with a drive in order to impart a specific speed to the paper web and to the support fabric, characterized by the following features:
    5.4 at least one dryer cylinder (10A, 10E, 10G) is drivable at a speed such that its peripheral speed differs from the speed of the paper web (9) or of a support fabric (2, 3, 4) carrying the paper web.
  6. Dryer section in accordance with claim 5, characterized in that the relevant dryer cylinder (10A, 10E) is drivable with a speed of rotation such that its peripheral speed is larger than the web speed or that of a support fabric (2, 3, 4) carrying the web (9).
  7. Dryer section in accordance with claim 5, characterized in that at least one dryer cylinder (10G) is drivable at a speed of rotation such that its peripheral speed is smaller than the web speed or than the speed of a support fabric (2, 3, 4) carrying the paper web (9).
  8. Dryer section in accordance with one of the claims 5 to 7, characterized in that means for overcoming the static friction between the paper web (9) and the support (2, 3, 4), on the one hand, and the jacket surface of the fast running cylinder (10A, 10E), on the other hand, are associated with the individual fast running cylinders (10A, 10E).
EP94116045A 1993-11-10 1994-10-12 Process for drying a paper web and dryer section of a papermachine Expired - Lifetime EP0653513B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/150,449 US5467534A (en) 1993-11-10 1993-11-10 Procedure for drying a paper web and a drying part for a paper machine
US150449 2002-05-17

Publications (3)

Publication Number Publication Date
EP0653513A2 EP0653513A2 (en) 1995-05-17
EP0653513A3 EP0653513A3 (en) 1996-01-31
EP0653513B1 true EP0653513B1 (en) 2000-01-19

Family

ID=22534582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94116045A Expired - Lifetime EP0653513B1 (en) 1993-11-10 1994-10-12 Process for drying a paper web and dryer section of a papermachine

Country Status (7)

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US (1) US5467534A (en)
EP (1) EP0653513B1 (en)
JP (1) JPH07189161A (en)
AT (1) ATE189015T1 (en)
CA (1) CA2135502A1 (en)
DE (1) DE4404717C2 (en)
FI (1) FI945280A7 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5467534A (en) * 1993-11-10 1995-11-21 Salter; Robert L. Procedure for drying a paper web and a drying part for a paper machine
US5638611A (en) * 1995-10-18 1997-06-17 Voith Sulzer Papiermaschinen Gmbh Single-tier drying section tailored for compensating stretching and shrinking of paper web
DE19602492C2 (en) * 1996-01-25 2000-12-07 Voith Sulzer Papiermasch Gmbh Machine for the production of a paper or cardboard web
DE19644018A1 (en) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Machine and method for producing a material web, in particular paper or cardboard web
EP1239075A1 (en) * 1996-12-18 2002-09-11 Voith Paper Patent GmbH Machine for making a web
DE102013203626A1 (en) 2013-03-04 2014-09-18 Voith Patent Gmbh Optimization of the drying group control

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE592125C (en) * 1931-01-20 1934-02-01 Karl Schoenemann Drive device for paper and similar machines
DE1157902B (en) * 1957-09-30 1963-11-21 Beloit Iron Works Drive for drying cylinder of a paper machine
US3801426A (en) * 1970-08-26 1974-04-02 Westinghouse Electric Corp Dryer control and grade change system for a paper machine
FI50263C (en) * 1974-09-12 1976-01-12 Valmet Oy A device in a paper machine for transferring a paper web from a press section to a drying section.
GB8805786D0 (en) * 1988-03-11 1988-04-13 Wiggins Teape Group Ltd Rope system for papermachine
DE9207656U1 (en) * 1992-06-05 1992-08-13 J.M. Voith Gmbh, 7920 Heidenheim Machine for producing a fibrous web
DE4218595C2 (en) * 1992-06-05 2001-04-19 Voith Paper Patent Gmbh Machine for the production of a paper web
US5467534A (en) * 1993-11-10 1995-11-21 Salter; Robert L. Procedure for drying a paper web and a drying part for a paper machine

Also Published As

Publication number Publication date
ATE189015T1 (en) 2000-02-15
CA2135502A1 (en) 1995-05-11
FI945280L (en) 1995-05-11
EP0653513A2 (en) 1995-05-17
FI945280A0 (en) 1994-11-09
DE4404717A1 (en) 1994-07-21
EP0653513A3 (en) 1996-01-31
DE4404717C2 (en) 1994-11-24
FI945280A7 (en) 1995-05-11
US5467534A (en) 1995-11-21
JPH07189161A (en) 1995-07-25

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