EP1527231A1 - Presse a patin - Google Patents

Presse a patin

Info

Publication number
EP1527231A1
EP1527231A1 EP03771110A EP03771110A EP1527231A1 EP 1527231 A1 EP1527231 A1 EP 1527231A1 EP 03771110 A EP03771110 A EP 03771110A EP 03771110 A EP03771110 A EP 03771110A EP 1527231 A1 EP1527231 A1 EP 1527231A1
Authority
EP
European Patent Office
Prior art keywords
shoe
press
coating
press according
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Withdrawn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
EP03771110A
Other languages
German (de)
English (en)
Inventor
Robert Wolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1527231A1 publication Critical patent/EP1527231A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses

Definitions

  • the invention relates to a shoe press of a machine for the production or treatment of a fibrous web, in particular paper or cardboard web, with a shoe press unit which comprises at least one press shoe and a flexible press belt guided over it and forms a press nip extended in the web running direction with a moving counter surface, the Area between the press shoe and the press belt is supplied with lubricating fluid. It also relates to a shoe press of the type specified in the preamble of claim 13. Such a shoe press is described, for example, in DE 198 60 687 AI.
  • Shoe presses are already known in which the pressure or pressure shoe is pressed against a counter roller via a series of pressure pistons, so that a uniform pressure appears to be ensured across the width, especially since thermal influences on the line force distribution are to be eliminated by thermal insulation built into the pressure shoe , Nevertheless, relatively narrowly limited moisture and / or dry peaks occur in the moisture cross profile, which is extremely unsatisfactory and ultimately inexplicable.
  • FIG. 1 The conditions on a press shoe used in combination with a Yankee cylinder result, for example, from FIG. 1, in which a conventional shoe press is shown in a schematic representation.
  • the shoe press 10 comprises a shoe press unit which is formed by a shoe press roll 12 and which, together with a Yankee cylinder 14, forms a press nip 16 which is elongated in the web running direction L. which the fibrous web 18 is guided, for example, together with a press felt 20.
  • the shoe press roller 12 comprises a circumferential flexible press jacket 22 and a press shoe 24 with associated support elements 26 which can be acted upon by means of rows of pressure pistons 28 in order to press the press shoe 24 provided within the press jacket 22 against the Yankee cylinder 14.
  • the fiber web 18 lies here on the side of the press felt 20 assigned to the Yankee cylinder 14.
  • An oil film 30 results between the press shoe 24 and the flexible press jacket 22 due to, for example, hydrodynamic and / or hydrostatic lubrication.
  • a thermal insulating layer 34 is provided between the two mutually facing support surfaces 32 of the support elements 22 and the press shoe 24.
  • the fibrous web 18 can, for example, also be sandwiched between two felts or, for example, a felt and a, for example, water-impermeable transfer belt.
  • the thermal insulation layer 34 is therefore below the press shoe 24. Temperature differences can therefore affect the entire width of the shoe.
  • the conditions of the lubricating oil film produced in the area between the press shoe and the press belt depend, among other things, on the shape of the press shoe, in particular at the beginning of the gap. Despite significant rather efforts towards adequate shape accuracy result in a considerable spread with regard to the local oil film thickness. At a point with a smaller film thickness, for example, there is greater viscous shear friction and heat development, which disproportionately heats up the smaller mass of the thinner oil film. As a result, the press shoe, which is usually made of bronze, is locally heated considerably. This temperature increase is kept away from the base body by the insulation between the upper part and base body, as a result of which extensive errors in the moisture cross profile can be avoided to some extent.
  • the bedding number [N / mm 2 ] is a measure of the compressibility of a material or an arrangement.
  • a bedding figure of 1 N / mm 2 means a yield of 1 mm with a line force of 1 N / mm. Any lowering of this bed number would make the press nip more forgiving with regard to the distribution of the axial force.
  • the invention has for its object inter alia to provide an improved shoe press of the type mentioned, in which the above-mentioned problems are eliminated.
  • the aim is to even out the pressing pressure profile resulting from the width of the shoe press and to reduce or avoid it Temperature differences resulting in the transverse direction and their effect in the transverse direction on the compression cross profile can be achieved.
  • this object is essentially achieved in that at least a part of the press shoe of the shoe press unit is separated from the lubricating fluid by a thermal insulating layer.
  • At least part of the press shoe of a shoe press between the press surface and the support surface is separated from the lubricating fluid in the region between the press belt or press jacket and the shoe by a thermal insulating layer.
  • the thermal insulating layer preferably extends generally in the direction of web travel.
  • the press shoe is provided on its side facing the press nip with a thermally insulating coating.
  • the thermal insulation layer is therefore a thermally insulating coating on the press surface of the press shoe facing the press nip, as a result of which the effects of different lubricating fluid or oil heating are largely kept away from the supporting substructure of the press shoe.
  • the formation of a respective local overpressure or underpressure is leveled.
  • the wet cross profile obtained after the shoe press becomes flatter and more stable.
  • the thermally insulating coating can be provided with a wear-resistant coating.
  • the press shoe can thus in particular three be carried out in layers.
  • the wear-resistant coating can consist, for example, of metal powder or the like.
  • the press shoe is at least essentially divided into two shoe parts by the thermal insulation layer.
  • the thermal insulation layer can at least substantially completely cut through the press shoe.
  • the press shoe is divided by the thermal insulating layer into a shoe part facing the press nip and a shoe part facing away from the press nip.
  • the thermal insulating layer can in particular run equidistantly from the contour of the press surface of the press shoe facing the press nip.
  • the shoe part facing the press nip has a smaller thickness than the shoe part facing away from the press nip.
  • the shoe part facing the press nip and the shoe part facing away from the press nip consist of different material.
  • the thermal insulating layer or thermally insulating coating can consist, for example, of plastic, ceramic, CFRP, a composite and / or some other low heat-conducting material.
  • a shoe press of the type specified in the preamble of claim 13 is proposed, which is characterized in that the press shoe is provided on its side facing the press nip with a coating having increased compressibility and / or increased damping properties and / or by a corresponding layer is divided into two shoe parts in order to counteract or prevent deviations over the web width and / or vibrations of the press pressure generated in the press nip.
  • This second aspect of the invention is of considerable practical advantage both in isolation and in combination with the first aspect of the invention.
  • an embodiment of the shoe press according to the invention is particularly conceivable in which the coating or layer of increased compressibility and / or increased damping properties is simultaneously formed by the thermal insulating layer or thermally insulating coating.
  • the coating or layer in question can therefore consist in particular of a compressible material that conducts heat poorly.
  • the coating or layer is preferably porous.
  • the coating or layer can, for example, have gas-filled bubbles or porous particles, or can have tubular tubes. be provided channels, which preferably extend transversely to the web running direction.
  • the tube-like channels can be provided at least in a central region of the coating or layer when viewed in the pressing direction or, for example, at least in a region of the coating adjacent to the pressing shoe. In the latter case, the tubular channels provided in the coating on the press shoe side are preferably delimited by the press shoe.
  • the press shoe can thus be provided with a compressible coating or layer, for example, with the result that the bed number of the shoe press nip is reduced and the errors in the distribution of the linear force that occur in the case of deviations in the press gap thickness are reduced.
  • the material compressibility of the usual coating or layering materials is not sufficient for this purpose, the hollow or displacement material must be given the possibility to evade there and thus at least become more compressible in its effect by means of constructed hollow or displacement volumes. If the compressibility constructed in this way were to be placed in the press jacket, it would be compressed and relaxed again with each nip pass and subjected to a correspondingly high dynamic load.
  • the dynamic load is reduced to the fluctuation range of the local press pressure, ideally being zero.
  • the respective hollow or displacement volumes are achieved, for example, by compressible gas bubbles (porosity) enclosed in the coating or layer and / or tubular, transverse channels arranged in the coating or layer, which can be filled with gas or liquid.
  • compressible or incompressible fluids can be used.
  • any combination of the two aspects of the invention is particularly advantageously possible, in which the coating or the cover can in particular be made of a compressible design from a poorly heat-conducting material.
  • the shoe press unit can in particular be a shoe press roll.
  • the counter surface is preferably formed by a counter roller or a drying cylinder, in particular a Yankee cylinder.
  • the shoe press according to the invention can be used with particular advantage for graphic papers, cardboard and packaging papers, tissue and / or the like.
  • Fig. 1 is a schematic partial representation of a conventional
  • FIG. 2 is a schematic partial representation of an embodiment of the shoe press according to the invention with a press shoe which is provided on its side facing the press nip with a thermally insulating coating,
  • FIG. 3 shows a schematic partial illustration of a further embodiment of the shoe press according to the invention, comparable to the embodiment according to FIG. 2, in which the thermally insulating coating is provided with a wear-resistant cover,
  • FIG. 4 shows a schematic partial representation of a further embodiment of the shoe press according to the invention with a press shoe which is divided into two shoe parts by a thermal insulation layer,
  • FIG. 5 shows a schematic partial illustration of a further embodiment of the shoe press according to the invention with a press shoe which is provided with a porous, gas-filled bubble coating,
  • FIG. 6 shows a schematic partial illustration of a further embodiment of the shoe press according to the invention with a press shoe which has a porous coating which is provided with tube-like channels which extend transversely to the web running direction and are provided in a central region of the coating when viewed in the pressing direction,
  • Fig. 7 is a schematic partial representation of a further embodiment of the shoe press according to the invention with a press shoe that has a porous coating that with tube-like channels extending transversely to the web running direction are provided, which, however, are provided here in an area adjacent to the press shoe and are delimited on the press shoe side by the press shoe, and
  • FIG. 8 is a purely schematic representation of the advantages achieved with a press shoe according to the invention with a thermally insulating coating compared to a press shoe without a thermally insulating coating.
  • FIG. 2 shows a schematic representation of an embodiment of the shoe press 36 according to the invention.
  • a shoe press 36 can be provided, in particular, in a machine for producing or treating a fibrous web, for example paper or cardboard web and in particular tissue or hygiene web.
  • a shoe press 36 can be used with particular advantage for graphic papers, cardboard and packaging papers, tissue and / or the like.
  • the shoe press 36 comprises a shoe press unit formed here, for example, by a shoe press roller 38, which forms a press nip 42 which is extended in the web running direction L with a moving counter surface 40.
  • the counter surface 40 is formed by a counter roller and in particular by a drying cylinder 44, which can be a Yankee cylinder, for example.
  • the fibrous web 46 here for example a paper web, is passed through the extended press nip 42 for the corresponding treatment.
  • the shoe press roller 38 comprises a press jacket 48 formed by a flexible rotating press belt and a press shoe 50 which can be acted upon by pressing elements and via which the flexible press jacket 48 can be pressed against the counter roller 44.
  • the press shoe 50 is provided with thermal insulation 52 on its underside.
  • the fibrous or paper web 46 can, for example, be guided through the press nip 42 together with a felt 54. After the press nip, the fibrous web 46 runs with the counter surface 40.
  • the area between the press shoe 50 and the press belt 48 is supplied with lubricating fluid, in particular lubricating oil 56.
  • At least part of the press shoe 50 of the shoe press unit 38 is separated from the lubricating fluid 56 provided in the area between the press shoe 50 and the press belt 48 by a thermal insulating layer or thermally insulating coating 58.
  • This thermal insulating layer or thermal insulating coating 58 generally extends in the web running direction L.
  • the press shoe 50 is provided with a thermally insulating coating 58 on its side facing the press nip 42.
  • the thermally insulating coating 58 can simultaneously have increased compressibility and / or increased damping properties.
  • FIG. 3 shows a schematic partial representation of a further embodiment of the shoe press according to the invention that is comparable to the embodiment according to FIG. 2, in which case the thermally insulating coating 58 is provided with a wear-resistant coating 60.
  • the thermal insulation 52 (see FIG. 2) on the underside of the shoe is missing in the present exemplary embodiment.
  • Fig. 4 shows a schematic partial representation of a further embodiment of the shoe press according to the invention.
  • the press shoe 50 is, by means of a thermal insulating layer 58, which at least essentially completely cuts through the press shoe 50 in the present exemplary embodiment, into an upper shoe part 62 facing the press nip 42 (cf. also FIG. 2) and a lower part facing away from the press nip 42 Shoe part 64 divided.
  • the thermal insulating layer 58 can in particular also run equidistant from the contour of the press surface of the press shoe 50 facing the press nip 42.
  • the shoe part 62 facing the press nip 42 (cf. also FIG. 2) has a smaller thickness in the present case than the shoe part 64 facing away from the press nip 42.
  • the thermal insulating layer 58 can in particular also have increased compressibility and / or increased damping properties.
  • FIG. 5 shows a schematic partial representation of a further embodiment of the shoe press according to the invention.
  • the press shoe 50 or the press shoe upper is provided with a porous, gas-filled bubbles 66 having a coating 58.
  • the lubricating or oil film 56 is formed between the coating 58 of the press shoe 50 and the press jacket 48.
  • the coating 58 thus again has increased compressibility and / or increased damping properties.
  • it can also be thermally insulating.
  • FIG. 6 shows a schematic partial illustration of an embodiment comparable to the embodiment according to FIG. 5, in which the porosity of the coating 58 is achieved, however, by means of tubular channels 68 extending transversely to the web running direction L. In the present case, these channels 68 are provided in a central region of the coating 58 when viewed in the pressing direction.
  • the coating 58 again has increased compressibility and / or increased damping properties.
  • it can also be thermally insulating.
  • FIG. 7 shows a schematic partial illustration of a further embodiment comparable to the embodiment according to FIG. 6, wherein in the present case the channels 68, which extend transversely to the web running direction L, are provided in an area of the coating 58 adjacent to the press shoe 50 and on the Press shoe side are limited by the press shoe 50 or the press shoe upper part.
  • the coating 58 thus again has increased compressibility and / or increased damping properties. In particular, it can also be thermally insulating.
  • FIG. 8 shows a schematic representation of the behavior of a press shoe 50 according to the invention with a thermally insulating coating 58 compared to a press shoe without such a thermally insulating coating.
  • Part a) of FIG. 8 shows a schematic cross-sectional view of a section of the press shoe, cut in a plane running transversely to web running direction L, and part b) of FIG. 8 shows a side view of the press shoe in question.
  • a stable lubricating film is possible in a wide range of thicknesses, whereby the pull-in conditions at the beginning of the gap are essential. Nevertheless, the local lubricating fluid or oil film thickness can be scattered.
  • effect 1 results, which is referred to as "effect 1" in part a) of FIG. 8:
  • the press shoe 50 expands locally and becomes correspondingly thicker. Accordingly, the press nip or gap becomes narrower.
  • the pressure increases in this area, which results in a so-called "peak" in the moisture cross profile.
  • effect 2 a further effect occurs, which is identified in part a) of FIG. 8 as "effect 2".
  • effect 2 a further effect occurs, which is identified in part a) of FIG. 8 as "effect 2".
  • Lubricating fluid lubricating oil, lubricating film, oil film thermal insulating layer, thermal insulating coating, wear-resistant coating, shoe part facing the press nip, upper shoe part shoe part facing away from press nip, lower shoe part gas-filled bladders tubular ducts supporting element

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  • Paper (AREA)

Abstract

L'invention concerne une presse à patin (10) d'une machine utilisée pour la production ou le traitement d'une bande de matière fibreuse (18), en particulier d'une bande de papier ou de carton. Cette presse à patin (10) comprend un ensemble presse à patin (12) qui présente au moins un patin de presse (24) ainsi qu'un ruban de presse (22) souple qui est guidé sur ledit patin de presse. Cet ensemble presse à patin (12) forme avec une surface antagoniste (14) une fente de pression qui se prolonge dans le sens de déplacement de la bande, la zone comprise entre le patin de presse (24) et le ruban de presse (22) étant alimentée en fluide lubrifiant. Au moins une partie du patin de presse (24) de l'ensemble presse (12) est séparée du fluide lubrifiant par une couche isolante thermique (34). Cette couche isolante thermique (34) peut également présenter une compressibilité élevée et/ou une capacité d'amortissement élevée.
EP03771110A 2002-07-25 2003-07-08 Presse a patin Withdrawn EP1527231A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10233922 2002-07-25
DE2002133922 DE10233922A1 (de) 2002-07-25 2002-07-25 Schuhpresse
PCT/EP2003/050289 WO2004011721A1 (fr) 2002-07-25 2003-07-08 Presse a patin

Publications (1)

Publication Number Publication Date
EP1527231A1 true EP1527231A1 (fr) 2005-05-04

Family

ID=30128393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03771110A Withdrawn EP1527231A1 (fr) 2002-07-25 2003-07-08 Presse a patin

Country Status (4)

Country Link
EP (1) EP1527231A1 (fr)
AU (1) AU2003251007A1 (fr)
DE (1) DE10233922A1 (fr)
WO (1) WO2004011721A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007008037A1 (de) 2007-02-17 2008-08-21 Voith Patent Gmbh Presswalze
DE102019104389A1 (de) * 2019-02-21 2020-08-27 Voith Patent Gmbh Schuhpresse

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3030233C2 (de) * 1980-08-09 1988-10-20 J.M. Voith Gmbh, 7920 Heidenheim Naßpresse zum Entwässern von Faserbahnen
DE3222932A1 (de) * 1982-06-18 1983-12-22 J.M. Voith Gmbh, 7920 Heidenheim Walzenpresse mit anpressschuh
DE3321214A1 (de) * 1982-06-18 1984-12-13 J.M. Voith Gmbh, 7920 Heidenheim Presseinrichtung fuer bahnfoermiges gut
DE3503240A1 (de) * 1985-01-31 1986-08-07 J.M. Voith Gmbh, 7920 Heidenheim Nasspresse zum entwaessern einer faserbahn
DE4307137A1 (en) * 1993-03-06 1993-08-19 Voith Gmbh J M Paper-making press station - has a mechanism at pressure chamber of pressure shoe to compensate for abrupt pressure peaks
DE4322876A1 (de) * 1993-07-09 1993-11-18 Voith Gmbh J M Vorrichtung zum Glätten einer Papierbahn oder Kartonbahn
DE29603714U1 (de) * 1996-02-29 1996-04-18 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Preßvorrichtung
DE19642047A1 (de) * 1996-10-11 1998-04-16 Voith Sulzer Papiermasch Gmbh Preßeinheit
US5951824A (en) * 1997-06-19 1999-09-14 Beloit Technologies, Inc. Compliant hydrodynamic/hydrostatic shoe for papermaking press
DE19860687A1 (de) * 1998-12-29 2000-07-06 Voith Sulzer Papiermasch Gmbh Maschine sowie Verfahren zur Herstellung einer Faserstoffbahn
DE10149816A1 (de) * 2001-10-09 2003-04-10 Voith Paper Patent Gmbh Presswalze

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004011721A1 *

Also Published As

Publication number Publication date
WO2004011721A1 (fr) 2004-02-05
DE10233922A1 (de) 2004-02-12
AU2003251007A1 (en) 2004-02-16
WO2004011721A8 (fr) 2005-03-17

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