EP2138630A2 - Cylindre - Google Patents

Cylindre Download PDF

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Publication number
EP2138630A2
EP2138630A2 EP09162900A EP09162900A EP2138630A2 EP 2138630 A2 EP2138630 A2 EP 2138630A2 EP 09162900 A EP09162900 A EP 09162900A EP 09162900 A EP09162900 A EP 09162900A EP 2138630 A2 EP2138630 A2 EP 2138630A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
jacket
cylinder jacket
covers
drying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09162900A
Other languages
German (de)
English (en)
Other versions
EP2138630A3 (fr
Inventor
Herbert Boden
Robert Bunzl
Günter SEITLHUBER
Rainer Kloibhofer
Thomas Hackl
Georg Geiger
Harald Graf-Müller
Nikolaus Dr. Friedl
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 EP2138630A2 publication Critical patent/EP2138630A2/fr
Publication of EP2138630A3 publication Critical patent/EP2138630A3/fr
Withdrawn legal-status Critical Current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
    • D21F5/021—Construction of the cylinders

Definitions

  • the invention relates to a cylinder, in particular drying cylinder of a BoostDryer unit, with a particular heatable cylinder jacket which is rotatably supported by two cylinder cover spaced apart in the direction of the cylinder axis, wherein a part of the outer peripheral surface of the cylinder jacket of an outer, at least partially in particular by a Pressure hood exposed load is exposed. It further relates to a drying arrangement, in particular BoostDryer unit, with such a cylinder.
  • boostDryers The principle of a so-called "BoostDryers” is for example from the publications EP-A-1 780 331 . WO-A-2006/072505 . WO 2005/100682 and DE-A-10 2004 017 810 known.
  • the paper is passed over a heated drying cylinder, wherein above the drying cylinder and the paper web touching it a porous fabric for absorbing moisture and above it runs a dense band.
  • WO-2006/072505 in particular, already known to perform the cylinder jacket clam shell.
  • the principle of the pressure hood arises in particular from the WO-2005/100682 ,
  • BoostDryer the paper is passed over a heated drying cylinder, with a porous covering for absorbing moisture and above it a dense strip running over the drying cylinder and the paper web contacting it. Above the dense band the pressure hood is attached. Pres-drying achieves high drying rates and good paper strength values.
  • the drying cylinder Due to the pressure of the hood, however, the drying cylinder is now subjected to strong bending, so that it must have a corresponding rigidity. If the drying cylinder is heated from the inside with steam, the cylinder wall must be made as thin as possible for an efficient transfer of the heat to the cylinder surface. But this is now contrary to a possible high rigidity or the highest possible moment of resistance. In view of this conflict of goals between on the one hand the highest possible moment of resistance and on the other hand the smallest possible wall thickness has been proposed to carry out the drying cylinder as a multi-shell construction (see, for example WO-A-2006/072505 ).
  • BoostDryer At the time of the DE-A-10 2004 017810 known drying arrangement or BoostDryer is provided below the cylinder and thus on the opposite side of the hood a support means which may comprise one or two support rollers, a plurality of juxtaposed over the width of the cylinder rollers, a support shoe or a support band.
  • a support means which may comprise one or two support rollers, a plurality of juxtaposed over the width of the cylinder rollers, a support shoe or a support band.
  • an external support device requires a relatively large amount of space, which is often not available.
  • such a construction is relatively expensive.
  • the invention has for its object to provide an improved cylinder and an improved drying arrangement of the type mentioned, in which the aforementioned disadvantages are eliminated.
  • the loads of the cylinder jacket or the associated inner shell are to be reduced to a minimum, in accordance with the weight and the cost of the cylinder to reduce accordingly.
  • this object is achieved in that the two cylinder cover are offset while maintaining a mutual distance, starting from the two edges of the cylinder jacket in the direction of the cylinder axis in each case.
  • the two cylinder covers are preferably each offset inwardly by an amount which is in the region of one quarter of the cylinder jacket length measured in the axial direction.
  • the loads on the cylinder jacket or on a two-shell version of the inner shell which is designed, for example, as a more stable support tube, are reduced.
  • the ideal lid position for a minimum transverse force load of the cylinder jacket or the inner shell is exactly one quarter of the shell length.
  • the ideal lid position is a little less than a quarter of the shell length. This results, for example, from the diagram of Fig. 1 in which the deflection of a uniformly loaded beam is reproduced for different pairs of support points.
  • the curve 10 shows the storage in the so-called Bessel points.
  • the vertical scale is greatly exaggerated in this diagram.
  • the two cylinder covers are thus to minimize the occurring under the external load lateral load and deflection the cylinder jacket in each case offset by at least substantially a quarter of the cylinder barrel length inward.
  • the lid position so in most cases, in particular at about a quarter of the jacket lengths are, on the one hand, in addition to the dominant lateral force load and the bending load into account, and on the other hand to take into account the fact that the pressure hood usually not over the entire shell length, but over a generally slightly shorter length extends.
  • the exact position of the cylinder cover for a minimum cylinder shell load or load on the inner shell can therefore be determined in the specific case. In all cases, it is about one quarter of the shell length.
  • the cylinder jacket preferably has at least one in particular annular space through which a heating medium, in particular vapor, flows.
  • the cylinder jacket can in particular be designed with two shells.
  • the inner shell may have a greater measured in the radial direction thickness than the outer shell.
  • the inner shell can thus be provided in particular as a support tube.
  • the space through which a heating medium flows is advantageously provided between the two shells of the cylinder jacket.
  • the loads of the support tube can be reduced accordingly, which can reduce the weight and cost of the cylinder.
  • the cylinder or drying cylinder can therefore withstand the forces occurring, for example, by the load on the pressure hood even with a less massive built inner shell or support tube.
  • An expedient practical embodiment of the cylinder according to the invention is characterized in that the two cylinder covers are associated with two co-rotating pins and the cylinder jacket is rotatably mounted on these pins associated with the cylinder covers.
  • the cylinder jacket connected in particular fixedly connected to the cylinder covers can also be rotatably mounted on at least one rotationally fixed carrier via the cylinder covers.
  • the cylinder jacket for example via the cylinder cover rotatably mounted on a cylinder jacket passing through a rotationally fixed support.
  • the cylinder jacket is rotatably mounted on the cylinder cover in each case on a pin projecting inwardly in the axial direction.
  • a cylinder for a BoostDryer unit with ideal lid position is thus advantageously designed in contrast to a vapor deposition of the entire cylinder cross-section with an annular vapor space.
  • the cylinder covers may be located at about one quarter of the shell length.
  • the mutual spacing of the bearings can again be smaller than the length of the material or fibrous web.
  • the drying arrangement according to the invention in particular BoostDryer unit, is characterized in that it comprises a cylinder according to the invention, in particular drying cylinders.
  • the drying arrangement comprises a pressure hood, wherein the external load, which is exposed to a part of the outer peripheral surface of the cylinder jacket, is caused by this pressure hood.
  • a preferred embodiment of the drying arrangement for drying a moving fibrous web, in particular paper, board or tissue web is characterized in that the fibrous web together with an outer impermeable press belt and at least one arranged between this and the fibrous web, the moisture absorption porous Covering is guided around the heatable rotatable cylinder and that the pressure hood is provided to act on the outer press belt, which surrounds the heatable rotatable cylinder together with the porous covering and the fibrous web.
  • Fig. 2 shows a schematic representation of an exemplary embodiment of a cylinder 12, which may in particular be a drying cylinder of a BoostDryer unit.
  • the cylinder 12 comprises a cylinder jacket 14 which can be heated in particular and which is rotatably supported by way of two cylinder covers 18 having a spacing from one another in the direction of the cylinder axis 16. A part of the outer circumferential surface of the cylinder jacket 14 is exposed to an external, at least partially caused in particular by a pressure hood area load.
  • the two cylinder covers 18 are offset while maintaining a mutual distance d, starting from the two edges 20 of the cylinder jacket 14 in the direction of the cylinder axis 16 in each case.
  • the two cylinder covers 18 can in particular each be offset inwardly by an amount 22 which lies in the region of a quarter of the cylinder jacket length 24 measured in the axial direction 16.
  • the two cylinder covers 18 can be offset in each case by at least substantially one quarter of the cylinder jacket length 24 in particular for minimizing the transverse load and deflection of the cylinder jacket 14 occurring under the external load.
  • the cylinder jacket 14 can expediently have at least one in particular annular space 26 through which a heating medium, in particular vapor, flows.
  • the cylinder jacket 14 may in particular be designed with two shells, wherein the inner shell 28 provided, for example, as a support tube may have a greater thickness measured in the radial direction than the outer shell 30.
  • the space traversed by a heating medium 26 between these two shells 28, 30 of the cylinder jacket 14 may be provided.
  • the cylinder jacket 14, which in particular is fixedly connected to the cylinder covers 18, can be rotatably mounted on at least one non-rotatable carrier via the cylinder cover 18, being rotatably supported in the present exemplary embodiment via this cylinder cover 18 on a rotatable carrier 32 passing through the cylinder jacket 14.
  • the cylinder jacket 14 can also be rotatably mounted via the cylinder cover 18, for example, in each case on a pin projecting inwardly in the axial direction.
  • the cylinder jacket 14 pivot bearings 34 are assigned, which are arranged at least substantially in the radially extending plane of the respective cylinder cover 18.
  • the cylinder or drying cylinder 12 may in particular be part of a drying arrangement, in particular a BoostDryer unit.
  • a drying arrangement may for example comprise a pressure hood, by which the external load, which is exposed to a part of the outer peripheral surface of the cylinder jacket 14, is caused.
  • the drying arrangement in question may be provided in particular for drying a running fibrous web, in particular paper, board or tissue web.
  • the drying arrangement may in particular be designed such that the fibrous web is guided around the heatable, rotatable cylinder 12 together with an outer impermeable press belt and at least one porous covering arranged between it and the fibrous web and absorbs the moisture the heatable rotatable Cylinder 12 is provided together with the porous fabric and the fibrous web wrap around outer press belt.

Landscapes

  • Drying Of Solid Materials (AREA)
EP09162900A 2008-06-26 2009-06-17 Cylindre Withdrawn EP2138630A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008002663A DE102008002663A1 (de) 2008-06-26 2008-06-26 Zylinder

Publications (2)

Publication Number Publication Date
EP2138630A2 true EP2138630A2 (fr) 2009-12-30
EP2138630A3 EP2138630A3 (fr) 2011-05-11

Family

ID=41120024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09162900A Withdrawn EP2138630A3 (fr) 2008-06-26 2009-06-17 Cylindre

Country Status (2)

Country Link
EP (1) EP2138630A3 (fr)
DE (1) DE102008002663A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100682A1 (fr) 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
DE102004017810A1 (de) 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Trockenanordnung
WO2006072505A1 (fr) 2005-01-05 2006-07-13 Voith Patent Gmbh Dispositif et procede de production et/ou de transformation d'une bande de matiere fibreuse
EP1780331A1 (fr) 2005-10-28 2007-05-02 Voith Patent GmbH Ensemble de séchage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH384292A (de) * 1959-07-30 1964-11-15 Masch Fabriken Tillm Gerber So Hohlwalze mit einem rohrartigen Walzenmantel und einem vom Mantel umschlossenen Walzenkern
GB1035527A (en) * 1963-04-09 1966-07-13 Beloit Corp Improvements in or relating to rolls mountings
US4385454A (en) * 1981-04-28 1983-05-31 Leland A. Withers, Sr. Insulation blanket and band clamps
SE8207251L (sv) * 1982-12-20 1984-06-21 Skandinaviska Apparatind Roterande vermevexlare
DE4125620C2 (de) * 1991-08-02 1995-04-20 Roland Man Druckmasch Montagevorrichtung für eine Walze, insbesondere Papierleitwalze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005100682A1 (fr) 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
DE102004017810A1 (de) 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Trockenanordnung
WO2006072505A1 (fr) 2005-01-05 2006-07-13 Voith Patent Gmbh Dispositif et procede de production et/ou de transformation d'une bande de matiere fibreuse
EP1780331A1 (fr) 2005-10-28 2007-05-02 Voith Patent GmbH Ensemble de séchage

Also Published As

Publication number Publication date
DE102008002663A1 (de) 2009-12-31
EP2138630A3 (fr) 2011-05-11

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