EP1838921A1 - Dry cylinder - Google Patents

Dry cylinder

Info

Publication number
EP1838921A1
EP1838921A1 EP05811125A EP05811125A EP1838921A1 EP 1838921 A1 EP1838921 A1 EP 1838921A1 EP 05811125 A EP05811125 A EP 05811125A EP 05811125 A EP05811125 A EP 05811125A EP 1838921 A1 EP1838921 A1 EP 1838921A1
Authority
EP
European Patent Office
Prior art keywords
drying cylinder
drying
fibrous web
cladding layer
layer
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.)
Withdrawn
Application number
EP05811125A
Other languages
German (de)
French (fr)
Inventor
Rainer Kloibhofer
Christoph Haase
Thomas Gruber-Nadlinger
Herbert Boden
Erich Rollenitz
Manfred Gloser
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 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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1838921A1 publication Critical patent/EP1838921A1/en
Withdrawn legal-status Critical Current

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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
    • D21F5/022—Heating the cylinders
    • D21F5/027—Heating the cylinders using a heat-transfer fluid between the heating means and the cylinder shell

Definitions

  • the invention relates to a drying cylinder for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with a carrier body and an outer jacket layer which is heated by a hot fluid.
  • drying arrangements with such drying cylinders have long been known, the fibrous web, which, supported by a drying wire, wraps around.
  • the contact of the fibrous web with the hot jacket surface causes the heating and, in particular, after the removal from the drying cylinder to evaporate.
  • the drying rate is essentially limited by the jacket thickness and thus the thermal resistance of the drying cylinder.
  • the object of the invention is therefore to increase the heat flow through the outer cladding layer.
  • this object is achieved in that between the support body and the outer cladding layer at least one cavity is present, through which the fluid flows and the outer cladding layer is predominantly so thin that the quotient of the thermal conductivity of the material and the thickness of the outer cladding layer greater as a limit, for steel 3.2 kW / m 2 K, for aluminum - 2 -
  • the support body preferably extends axially over the entire drying cylinder and ensures sufficient stability of the same. This leads to a substantial relief of the supporting function of the outer jacket layer, so that it can be made much thinner.
  • the outer cladding layer must only support itself and absorb the internal pressure of the fluid in the cavity. Depending on the design and extent of the drying cylinder and the support of the outer cladding layer results in a minimum thickness for the outer cladding layer.
  • the upper limit of the thickness of the cladding layer is determined by the o.g. Limit value given.
  • the outer jacket layer should be supported by tie rods on the support body. This can about struts, partitions o.a. take place, with fixed or positive connections are possible.
  • the support body carries an inner cladding layer, the like with the outer cladding layer via connecting elements such as webs, fins o.a. is connected, wherein the cavity between the outer and the inner cladding layer is formed.
  • the fluid is vapor and the pressure in the cavity is preferably between 1, 5 and 13 bar, it will suffice to make the outer jacket layer with a thickness between 5 and 15 mm.
  • Jacket layer of advantage these profiled inside, preferably grooved perform.
  • the quotient should be outside the tie rods or fasteners above the corresponding limit and / or at more than 60%, preferably more than 75% of the outer surface of the outer cladding layer, the quotient at least on average greater than the corresponding limit.
  • a preferred application of the heated drying cylinder results in addition to the replacement of conventional drying cylinders in drying arrangements for a fibrous web, in which at least one water-absorbing band wraps around the drying cylinder together with the fibrous web, the fibrous web comes into contact with the drying cylinder and another, outer, dense band is cooled in the wrap of the drying cylinder.
  • the steam resulting from the heating of the fibrous web during contact with the heated drying cylinder passes into the water-absorbing ribbons surrounding the fibrous web when the drying cylinder is wrapped around. These tapes cause condensation and storage of the condensate.
  • the dense band wraps around the drying cylinder, preventing steam from escaping.
  • This dense band is usually cooled, so as to specify by the gain of the temperature gradient to the heated drying cylinder towards the direction of evaporation from the fibrous web and to enhance the condensation of the vapor.
  • the fibrous web is pressed by a belt, preferably a dryer, with a strip tension of at least 10, preferably at least 20 kN / m on the outer surface of the drying cylinder.
  • FIG 1 a schematic cross section through a drying cylinder 4, Figure 2. another drying cylinder 4 and
  • Figure 3 a cross section through a drying arrangement.
  • the essential feature of the drying cylinder 4 according to the invention is a very thin outer jacket layer 7, which is stabilized by a supporting body 8 of the drying cylinder 4.
  • the quotient A of the thermal conductivity ⁇ and the jacket thickness s is greater than 3.2 kW / m 2 K.
  • the thickness of the outer jacket layer 7 is therefore between 4 and 18 mm.
  • the loss of stability compensates for the support body 8, which extends axially over the entire drying cylinder 4. - 5 -
  • the vapor in the cavities has a pressure between 1, 5 and 10 bar and flows axially through the cavities 12.
  • this cladding layer 7 has ribs 10 which protrude from the condensate layer.
  • the support body 8 is formed as a thick-walled cylinder jacket, which limits the cavities 12 at the same time.
  • the cavities 12 in Figure 2 are bounded by an inner 11 and an outer 7 cladding layer.
  • As stabilizing connecting elements 6 between these cladding layers 7,11 sidewalls are used.
  • the inner cladding layer 11 is supported by the support body 8.
  • FIG. 3 shows a preferred application of the drying cylinder 4 in a drying arrangement in which the fibrous web 1, together with at least one water-absorbing band 2 and an outwardly dense band 3, wraps around the drying cylinder 4.
  • the dense band 2 is cooled during the wrapping of a hood 5 with water.
  • the heating of the fibrous web 1 during contact with the outer jacket layer 7 of the drying cylinder 4 leads to evaporation and condensation of the liquid in the water-absorbing belt 2. This is from - 6 -

Landscapes

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

Abstract

The invention relates to a dry cylinder (4) which is used to dry a paper, cardboard, tissue of other web of fibrous material (1 ) in a machine for the production and/or for the transformation thereof. Said dry cylinder comprises a support body (8) and an external cover layer (7) which is heated by a hot fluid. The thermal flow passing through the external cover layer (7) is increased such that at least one cavity (12) is provided between the support body (8) and the external cover layer (7) through which the fluid flows, and the external cover layer (7) is predominately so thin that the quotient (A) formed by the thermal conductivity of the material and the thickness(s) of the external cover layer (7) is greater than a threshold value (G) which is 3,2 kW/m2K for steel, 30 kW/m2K for aluminium, 18 kW/m2K for bronze alloys, 3,4 kW/m2K for copper and 6,1 kW/m2K for magnesium.

Description

Trockenzylinderdrying cylinders
Die Erfindung betrifft einen Trockenzylinder zur Trocknung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn in einer Maschine zur Herstellung und/oder Veredlung derselben mit einem Tragkörper und einer äußeren Mantelschicht, die von einem heißen Fluid beheizt wird.The invention relates to a drying cylinder for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with a carrier body and an outer jacket layer which is heated by a hot fluid.
Trocknungsanordnungen mit derartigen Trockenzylindern sind seit langem bekannt, wobei die Faserstoffbahn diese, von einem Trockensieb gestützt, umschlingt. Durch den Kontakt der Faserstoffbahn mit der heißen Mantelfläche kommt es zur Aufheizung und insbesondere nach der Wegführung vom Trockenzylinder zur Ausdampf u ng.Drying arrangements with such drying cylinders have long been known, the fibrous web, which, supported by a drying wire, wraps around. The contact of the fibrous web with the hot jacket surface causes the heating and, in particular, after the removal from the drying cylinder to evaporate.
Diese Trocknungsanordnungen benötigen wegen der begrenzten Trocknungsrate der Trockenzylinder relativ viel Raum.These drying arrangements require relatively much space because of the limited drying rate of the drying cylinders.
Dabei wird die Trocknungsrate im wesentlichen von der Mantelstärke und damit dem Wärmeleitwiderstand des Trockenzylinders begrenzt.The drying rate is essentially limited by the jacket thickness and thus the thermal resistance of the drying cylinder.
Andererseits erfordert die Länge von mehreren Metern und der Durchmesser von mehr als einem Meter schon zur Gewährleistung einer ausreichenden Stabilität einen relativ dicken Zylindermantel.On the other hand, the length of several meters and the diameter of more than one meter already requires a relatively thick cylinder jacket to ensure sufficient stability.
Die Aufgabe der Erfindung ist es daher, den Wärmestrom durch die äußere Mantelschicht zu vergrößern.The object of the invention is therefore to increase the heat flow through the outer cladding layer.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass zwischen dem Tragkörper und der äußeren Mantelschicht zumindest ein Hohlraum vorhanden ist, durch den das Fluid strömt und die äußere Mantelschicht überwiegend so dünn ist, dass der Quotient aus der Wärmeleitfähigkeit des Materials und der Dicke der äußeren Mantelschicht größer als ein Grenzwert ist, der für Stahl 3,2 kW/m2K, für Aluminium - 2 -According to the invention, this object is achieved in that between the support body and the outer cladding layer at least one cavity is present, through which the fluid flows and the outer cladding layer is predominantly so thin that the quotient of the thermal conductivity of the material and the thickness of the outer cladding layer greater as a limit, for steel 3.2 kW / m 2 K, for aluminum - 2 -
30 kW/m2K, für Bronzelegierungen 18 kW/m2K, für Kupfer 3,4 kW/m2K und für Magnesium 6,1 kW/m2K beträgt.30 kW / m 2 K, 18 kW / m 2 K for bronze alloys, 3.4 kW / m 2 K for copper and 6.1 kW / m 2 K for magnesium.
Der Tragkörper erstreckt sich vorzugsweise axial über den gesamten Trockenzylinder und sorgt für eine ausreichende Stabilität desselben. Dies führt zu einer wesentlichen Entlastung der Tragfunktion der äußeren Mantelschicht, so dass diese viel dünner ausgeführt werden kann.The support body preferably extends axially over the entire drying cylinder and ensures sufficient stability of the same. This leads to a substantial relief of the supporting function of the outer jacket layer, so that it can be made much thinner.
Im wesentlichen muss die äußere Mantelschicht nur sich selbst tragen und den Innendruck des Fluids im Hohlraum aufnehmen. Je nach Konstruktion und Ausdehnung des Trockenzylinders sowie der Abstützung der äußeren Mantelschicht ergibt sich eine Mindeststärke für die äußere Mantelschicht.Essentially, the outer cladding layer must only support itself and absorb the internal pressure of the fluid in the cavity. Depending on the design and extent of the drying cylinder and the support of the outer cladding layer results in a minimum thickness for the outer cladding layer.
Die obere Begrenzung der Dicke der Mantelschicht wird für das entsprechende Material durch den o.g. Grenzwert gegeben.The upper limit of the thickness of the cladding layer is determined by the o.g. Limit value given.
Vorzugsweise sollte sich die äußere Mantelschicht über Zuganker am Tragkörper abstützen. Dies kann über Streben, Zwischenwände o.a. erfolgen, wobei feste oder formschlüssige Verbindungen möglich sind.Preferably, the outer jacket layer should be supported by tie rods on the support body. This can about struts, partitions o.a. take place, with fixed or positive connections are possible.
Es kann aber auch von Vorteil sein, wenn der Tragkörper eine innere Mantelschicht trägt, die mit der äußeren Mantelschicht über Verbindungselemente wie Stege, Lamellen o.a. verbunden ist, wobei der Hohlraum zwischen der äußeren und der inneren Mantelschicht gebildet wird.But it may also be advantageous if the support body carries an inner cladding layer, the like with the outer cladding layer via connecting elements such as webs, fins o.a. is connected, wherein the cavity between the outer and the inner cladding layer is formed.
Insbesondere dann, wenn das Fluid Dampf ist und der Druck im Hohlraum vorzugsweise zwischen 1 ,5 und 13 bar liegt, dürfte es genügen, die äußere Mantelschicht mit einer Dicke zwischen 5 und 15 mm auszuführen.In particular, when the fluid is vapor and the pressure in the cavity is preferably between 1, 5 and 13 bar, it will suffice to make the outer jacket layer with a thickness between 5 and 15 mm.
Um dabei den Wärmeübergang vom Dampf zur äußeren Mantelschicht zu verbessern, ist es wegen der Kondensatbildung an der Innenseite der äußeren - 3 -In order to improve the heat transfer from the steam to the outer cladding layer, it is due to the formation of condensation on the inside of the outer - 3 -
Mantelschicht von Vorteil, diese Innenseite profiliert, vorzugsweise gerillt auszuführen.Jacket layer of advantage, these profiled inside, preferably grooved perform.
Im Interesse eines möglichst großen Wärmestromes sollte der Quotient außerhalb von Zugankern oder Verbindungselemente über dem entsprechenden Grenzwert liegen und/oder bei mehr als 60%, vorzugsweise mehr als 75% der Mantelfläche der äußeren Mantelschicht der Quotient zumindest im Durchschnitt größer als der entsprechende Grenzwert sein.In the interest of the largest possible heat flow, the quotient should be outside the tie rods or fasteners above the corresponding limit and / or at more than 60%, preferably more than 75% of the outer surface of the outer cladding layer, the quotient at least on average greater than the corresponding limit.
Eine bevorzugte Anwendung des beheizten Trockenzylinders ergibt sich neben dem Ersatz konventioneller Trockenzylinder in Trocknungsanordnungen für eine Faserstoffbahn, bei denen zumindest ein wasseraufnehmendes Band gemeinsam mit der Faserstoffbahn den Trockenzylinder umschlingt, die Faserstoffbahn mit dem Trockenzylinder in Kontakt kommt und ein weiteres, außen liegendes, dichtes Band im Umschlingungsbereich des Trockenzylinders gekühlt wird.A preferred application of the heated drying cylinder results in addition to the replacement of conventional drying cylinders in drying arrangements for a fibrous web, in which at least one water-absorbing band wraps around the drying cylinder together with the fibrous web, the fibrous web comes into contact with the drying cylinder and another, outer, dense band is cooled in the wrap of the drying cylinder.
In derartigen Trocknungsanordnungen gelangt der, durch die Erhitzung der Faserstoffbahn während des Kontaktes mit dem beheizten Trockenzylinder entstehende Dampf in die, die Faserstoffbahn bei der Umschlingung des Trockenzylinders umgebenden, wasseraufnehmenden Bänder. In diesen Bändern kommt es zur Kondensation und Speicherung des Kondensats.In such drying arrangements, the steam resulting from the heating of the fibrous web during contact with the heated drying cylinder passes into the water-absorbing ribbons surrounding the fibrous web when the drying cylinder is wrapped around. These tapes cause condensation and storage of the condensate.
Nach der Umschlingung werden die Bänder von der Faserstoffbahn weggeführt, gereinigt und wieder getrocknet.After wrapping, the strips are led away from the fibrous web, cleaned and dried again.
Auf den Bändern umschlingt das dichte Band den Trockenzylinder und verhindert so, dass Dampf entweicht. Dieses dichte Band wird meist gekühlt, um so durch die Verstärkung des Temperaturgradienten zum beheizten Trockenzylinder hin die Richtung der Verdampfung aus der Faserstoffbahn vorzugeben und die Kondensation des Dampfes zu verstärken. - A -On the tapes, the dense band wraps around the drying cylinder, preventing steam from escaping. This dense band is usually cooled, so as to specify by the gain of the temperature gradient to the heated drying cylinder towards the direction of evaporation from the fibrous web and to enhance the condensation of the vapor. - A -
Zur Verbesserung des Wärmeübergangs ist es vorteilhaft, wenn die Faserstoffbahn von einem Band, vorzugsweise einem Trockensieb, mit einem Bandzug von mindestens 10, vorzugsweise zumindest 20 kN/m auf die Mantelfläche des Trockenzylinders gepresst wird.To improve the heat transfer, it is advantageous if the fibrous web is pressed by a belt, preferably a dryer, with a strip tension of at least 10, preferably at least 20 kN / m on the outer surface of the drying cylinder.
Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden. In der beigefügten Zeichnung zeigt:The invention will be explained in more detail below with reference to several exemplary embodiments. In the attached drawing shows:
Figur 1 : einen schematischen Querschnitt durch einen Trockenzylinder 4, Figur 2. einen anderen Trockenzylinder 4 undFigure 1: a schematic cross section through a drying cylinder 4, Figure 2. another drying cylinder 4 and
Figur 3: einen Querschnitt durch eine Trocknungsanordnung.Figure 3: a cross section through a drying arrangement.
Das wesentliche Merkmal des erfindungsgemäßen Trockenzylinders 4 ist eine möglichst dünne äußere Mantelschicht 7, welche von einem Tragkörper 8 des Trockenzylinders 4 stabilisiert wird.The essential feature of the drying cylinder 4 according to the invention is a very thin outer jacket layer 7, which is stabilized by a supporting body 8 of the drying cylinder 4.
Dabei befinden sich zwischen dem Tragkörper 8 und der äußeren Mantelschicht 7 mehrere axial verlaufende Hohlräume 12, durch die heißer Dampf strömt. Dieser Dampf bewirkt eine Aufheizung der äußeren Mantelschicht 7 und damit auch der damit in Kontakt stehenden Faserstoffbahn 1.Here are located between the support body 8 and the outer cladding layer 7 a plurality of axially extending cavities 12, flows through the hot steam. This steam causes a heating of the outer cladding layer 7 and thus also the fibrous web 1 in contact therewith.
Um den Wärmestrom durch die äußere Mantelschicht 7 zu optimieren, ist diese in Abhängigkeit vom eingesetzten Material möglichst dünn auszuführen. Da hier Stahl zum Einsatz kommt, ist der Quotient A aus der Wärmeleitfähigkeit λ und der Mantelstärke s größer als 3,2 kW/m2K. Die Dicke der äußeren Mantelschicht 7 liegt daher zwischen 4 und 18 mm.In order to optimize the heat flow through the outer cladding layer 7, this is as thin as possible depending on the material used. Since steel is used here, the quotient A of the thermal conductivity λ and the jacket thickness s is greater than 3.2 kW / m 2 K. The thickness of the outer jacket layer 7 is therefore between 4 and 18 mm.
Den Verlust an Stabilität gleicht dabei der Tragkörper 8 aus, welcher sich axial über den gesamten Trockenzylinder 4 erstreckt. - 5 -The loss of stability compensates for the support body 8, which extends axially over the entire drying cylinder 4. - 5 -
Der Dampf in den Hohlräumen hat einen Druck zwischen 1 ,5 und 10 bar und strömt axial durch die Hohlräume 12. Die Ver- und Entsorgung des Dampfes erfolgt über Drehanschlüsse am Trockenzylinder 4.The vapor in the cavities has a pressure between 1, 5 and 10 bar and flows axially through the cavities 12. The supply and disposal of the steam via rotary connections on the drying cylinder 4th
An der äußeren Mantelschicht 7 kommt es zur Kondensation. Um dennoch einen guten Wärmeübergang vom Dampf zur äußeren Mantelschicht 7 gewährleisten zu können, besitzt die Innenseite dieser Mantelschicht 7 Rippen 10, die aus der Kondensatschicht herausragen.At the outer cladding layer 7, it comes to condensation. Nevertheless, in order to ensure a good heat transfer from the steam to the outer cladding layer 7, the inside of this cladding layer 7 has ribs 10 which protrude from the condensate layer.
In Figur 1 ist der Tragkörper 8 als dickwandiger Zylindermantel ausgebildet, welcher gleichzeitig die Hohlräume 12 begrenzt.In Figure 1, the support body 8 is formed as a thick-walled cylinder jacket, which limits the cavities 12 at the same time.
Zwischen dem Tragkörper 8 und der äußeren Mantelschicht 7 befinden sich über den Umfang verteilt angeordnete Zuganker 9, welche die äußere Mantelschicht 7 gegen den Überdruck des Dampfes in den Hohlräumen 12 am Tragkörper 8 halten.Between the support body 8 and the outer cladding layer 7 are distributed over the circumference arranged tie rods 9, which hold the outer cladding layer 7 against the pressure of the vapor in the cavities 12 on the support body 8.
Im Gegensatz hierzu werden die Hohlräume 12 in Figur 2 von einer inneren 11 und einer äußeren 7 Mantelschicht begrenzt. Als stabilisierenden Verbindungselemente 6 zwischen diesen Mantelschichten 7,11 kommen Seitenwände zum Einsatz. Die innere Mantelschicht 11 wird vom Tragkörper 8 getragen.In contrast, the cavities 12 in Figure 2 are bounded by an inner 11 and an outer 7 cladding layer. As stabilizing connecting elements 6 between these cladding layers 7,11 sidewalls are used. The inner cladding layer 11 is supported by the support body 8.
Figur 3 zeigt eine bevorzugte Anwendung des Trockenzylinders 4 in einer Trocknungsanordnung, in der die Faserstoffbahn 1 gemeinsam mit mindestens einem wasseraufnehmenden Band 2 und einem nach außen dichten Band 3 den Trockenzylinder 4 umschlingt.FIG. 3 shows a preferred application of the drying cylinder 4 in a drying arrangement in which the fibrous web 1, together with at least one water-absorbing band 2 and an outwardly dense band 3, wraps around the drying cylinder 4.
Dabei wird das dichte Band 2 während der Umschlingung von einer Haube 5 mit Wasser gekühlt.In this case, the dense band 2 is cooled during the wrapping of a hood 5 with water.
Die Erhitzung der Faserstoffbahn 1 während des Kontaktes mit der äußeren Mantelschicht 7 des Trockenzylinders 4 führt zu einer Ausdampfung und Kondensation der Flüssigkeit im wasseraufnehmenden Band 2. Dies wird vom - 6 -The heating of the fibrous web 1 during contact with the outer jacket layer 7 of the drying cylinder 4 leads to evaporation and condensation of the liquid in the water-absorbing belt 2. This is from - 6 -
Temperaturgradienten zwischen Trockenzylinder 4 und dem gekühlten Band 3 noch unterstützt. Temperature gradient between drying cylinder 4 and the cooled belt 3 still supported.

Claims

- 7 -Patentansprüche - 7 patent claims
1. Trockenzylinder (4) zur Trocknung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn (1 ) in einer Maschine zur Herstellung und/oder1. drying cylinder (4) for drying a paper, board, tissue or another fibrous web (1) in a machine for manufacturing and / or
Veredlung derselben mit einem Tragkörper (8) und einer äußeren Mantelschicht (7), die von einem heißen Fluid beheizt wird, dadurch gekennzeichnet, dass zwischen dem Tragkörper (8) und der äußeren Mantelschicht (7) zumindest ein Hohlraum (12) vorhanden ist, durch den das Fluid strömt und die äußere Mantelschicht (7) überwiegend so dünn ist, dass der Quotient (A) aus derFinishing same with a support body (8) and an outer cladding layer (7) which is heated by a hot fluid, characterized in that between the support body (8) and the outer cladding layer (7) at least one cavity (12) is present, through which the fluid flows and the outer jacket layer (7) is predominantly so thin that the quotient (A) from the
Wärmeleitfähigkeit (λ) des Materials und der Dicke (s) der äußeren Mantelschicht (7) größer als ein Grenzwert (G) ist, der für Stahl 3,2 kW/m2K, für Aluminium 30 kW/m2K, für Bronzelegierungen 18 kW/m2K, für Kupfer 3,4 kW/m2K und für Magnesium 6,1 kW/m2K beträgt.Thermal conductivity (λ) of the material and the thickness (s) of the outer cladding layer (7) is greater than a limit (G), for steel 3.2 kW / m 2 K, for aluminum 30 kW / m 2 K, for bronze alloys 18 kW / m 2 K, 3.4 kW / m 2 K for copper and 6.1 kW / m 2 K for magnesium.
2. Trockenzylinder (4) nach Anspruch 1 , dadurch gekennzeichnet, dass sich die äußere Mantelschicht (7) über Zuganker (9) am Tragkörper (8) abstützt.2. drying cylinder (4) according to claim 1, characterized in that the outer jacket layer (7) via tie rods (9) on the support body (8) is supported.
3. Trockenzylinder (4) nach Anspruch 1 , dadurch gekennzeichnet, dass der Tragkörper (8) eine innere Mantelschicht (11 ) trägt, die mit der äußeren3. drying cylinder (4) according to claim 1, characterized in that the supporting body (8) carries an inner cladding layer (11) with the outer
Mantelschicht (7) über Verbindungselemente (6) wie Stege, Lamellen o. ä. verbunden ist, wobei der Hohlraum (12) zwischen der äußeren (7) und der inneren (11 ) Mantelschicht gebildet wird.Sheath layer (7) via connecting elements (6) such as webs, fins o. Ä. Is connected, wherein the cavity (12) between the outer (7) and the inner (11) sheath layer is formed.
4. Trockenzylinder (4) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Fluid Dampf ist und der Druck im Hohlraum (12) vorzugsweise zwischen 1 ,5 und 13 bar liegt.4. drying cylinder (4) according to any one of the preceding claims, characterized in that the fluid is steam and the pressure in the cavity (12) is preferably between 1, 5 and 13 bar.
5. Trockenzylinder (4) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass - 8 -5. drying cylinder (4) according to one of the preceding claims, characterized in that - 8th -
die Innenseite der äußeren Mantelschicht (7) profiliert, vorzugsweise gerillt ausgeführt ist.the inside of the outer jacket layer (7) is profiled, preferably grooved.
6. Trockenzylinder (4) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Quotient (A) außerhalb von Zugankern (9) oder Verbindungselementen (6) über dem entsprechenden Grenzwert (G) liegt.6. drying cylinder (4) according to any one of the preceding claims, characterized in that the quotient (A) outside of tie rods (9) or connecting elements (6) above the corresponding limit value (G).
7. Trockenzylinder (4) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei mehr als 60%, vorzugsweise mehr als 75% der Mantelfläche der äußeren Mantelschicht (7) der Quotient (A) zumindest im Durchschnitt größer als der entsprechende Grenzwert (G) ist.7. drying cylinder (4) according to any one of the preceding claims, characterized in that at more than 60%, preferably more than 75% of the lateral surface of the outer cladding layer (7) of the quotient (A) at least on average greater than the corresponding limit value (G ).
8. Anwendung des beheizten Trockenzylinders (4) nach einem der vorhergehenden Ansprüche in einer Trocknungsanordnung für eine Faserstoffbahn (1 ), wobei zumindest ein wasseraufnehmendes Band (2) gemeinsam mit der Faserstoffbahn (1 ) den Trockenzylinder (4) umschlingt und die Faserstoffbahn (1 ) mit dem Trockenzylinder (4) in Kontakt kommt, dadurch gekennzeichnet, dass ein weiteres, außen liegendes, dichtes Band (3) gekühlt wird.8. Application of the heated drying cylinder (4) according to one of the preceding claims in a drying arrangement for a fibrous web (1), wherein at least one water-absorbing tape (2) together with the fibrous web (1) wraps around the drying cylinder (4) and the fibrous web (1 ) comes into contact with the drying cylinder (4), characterized in that a further, outer, dense band (3) is cooled.
9. Anwendung des beheizten Trockenzylinders (4) in einer Trockenanordnung für eine Faserstoffbahn (1 ) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Faserstoffbahn (1 ) von einem Band, vorzugsweise einem Trockensieb, mit einem Bandzug von mindestens 10, vorzugsweise zumindest 20 kN/m auf die Mantelfläche des Trockenzylinders (4) gepresst wird. 9. Application of the heated drying cylinder (4) in a drying arrangement for a fibrous web (1) according to one of the preceding claims, characterized in that the fibrous web (1) of a band, preferably a drying wire, with a strip tension of at least 10, preferably at least 20 kN / m is pressed onto the outer surface of the drying cylinder (4).
EP05811125A 2005-01-05 2005-11-22 Dry cylinder Withdrawn EP1838921A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005000782A DE102005000782A1 (en) 2005-01-05 2005-01-05 Drying cylinder for use in the production or finishing of fibrous webs, e.g. paper, comprises heating fluid channels between a supporting structure and a thin outer casing
PCT/EP2005/056151 WO2006072507A1 (en) 2005-01-05 2005-11-22 Dry cylinder

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CN (1) CN101094953A (en)
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BRPI0518106A (en) 2008-11-04
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US20070294914A1 (en) 2007-12-27
JP2011047643A (en) 2011-03-10
RU2007129851A (en) 2009-02-20
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DE102005000782A1 (en) 2006-07-20
US7802377B2 (en) 2010-09-28

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