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EP2584092A1 - Rouleau - Google Patents

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Publication number
EP2584092A1
EP2584092A1 EP12188648.5A EP12188648A EP2584092A1 EP 2584092 A1 EP2584092 A1 EP 2584092A1 EP 12188648 A EP12188648 A EP 12188648A EP 2584092 A1 EP2584092 A1 EP 2584092A1
Authority
EP
European Patent Office
Prior art keywords
roll
roller
groove
edge regions
roller according
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Withdrawn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
EP12188648.5A
Other languages
German (de)
English (en)
Inventor
Michael Weinzettl
Frank Kretschmer
Peter Mödl
Johan Einarsson
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 EP2584092A1 publication Critical patent/EP2584092A1/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Withdrawn legal-status Critical Current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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls
    • D21F3/105—Covers thereof
    • 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
    • D21F3/08—Pressure rolls
    • D21F3/083—Pressure rolls perforated

Definitions

  • the invention relates to a roller, in particular for the press section of a web-producing machine, such as a paper, board or tissue machine, according to the preamble of claim 1.
  • a roller with such a surface design is for example from the European patent EP 1 103 654 B1 out.
  • This shows a roll with a hollow roll shell with perforations and a roll cover, wherein the roll cover is provided on the perforated hollow roll shell and comprises an outwardly facing working contact surface in which a plurality of through holes are provided which extend through the roll cover and aligned with respective jacket perforations are to provide suction holes in the roller.
  • the working contact surface further comprises a plurality of blind holes or blind holes, wherein the cross-sectional area of each through hole corresponds to each blind bore.
  • the work surface includes a continuous circumferential groove connecting the through holes.
  • Such rollers cooperate with fabrics that transport and support the fibrous web through the machine, since the fibrous web is not stable enough, especially in the wet end of the machine to go through free trains between rollers without strings.
  • the fabrics are each matched to their position in the machine and fulfill different tasks depending on the position.
  • press felts with the best possible water storage and discharge function are required, which together with the surface shapes of the rolls in a nip between two rolls or between a roller and the press shoe of a shoe press absorb water pressed out of the fibrous web, so that the To promote dry content of the fibrous web. Press felts of this type are known from a variety of publications.
  • roller and clothing are thus of particular importance for the quality of the final product.
  • edge regions of the rollers are perceived where both the edges of the fibrous web and the edges of the fibrous web transporting fabrics run.
  • the fabrics often have properties in the edge regions which differ from the mid-fabric (as seen in the cross-machine direction), such as different permeability due to heating and subsequent shrinkage in the manufacturing process.
  • the loading of the clothing in the roll or shoe press nip leads by deformations of the rollers, crowns, etc. to different contact pressures and as a result to different levels of stress on the felts in the middle and in the edge region. As a result, deviating drainage behavior of the clothing in the edge region occurs.
  • edge regions of the clothing are often contaminated by the contact with the material web edge and the abrasion occurring there.
  • the object of the invention is thus to develop surface shapes of the roll covers so that the known roll side disadvantages of the prior art are avoided in the edge regions.
  • the surface shapes, which are formed in the working contact surface of a roll cover have edge areas which are different in size from the central area of the roll and / or have different open volumes.
  • the dewatering behavior and the dry content of the fibrous web can be modeled in a targeted manner, while negative side effects such as edge rise, wrinkling, web incisions, etc. can be reduced.
  • the open area formed by the surface shapes and / or the open volume formed by the surface shapes is greater in the edge regions of the roll than in the central region of the roll.
  • the surface shapes may be in the form of suction bores and / or blind bores and / or at least one groove which penetrates the roll cover and the roll shell.
  • the possible combinations can be selected according to the pressing pressures in the press section and the desired dry content of the fibrous web.
  • the suction holes and / or the blind holes in the edge regions have a larger diameter of up to 4 mm than in the central region of the roller, whereby the drainage is promoted in the edge regions.
  • the number of blind holes in the edge regions may be higher than in the middle region of the roll.
  • the at least one groove may be in the form of a spiral groove extending over at least part of the axial length of the roller, in the form of a plurality of parallel spiral grooves, or in the form of individual notches adjacent to one another.
  • the respective most favorable embodiment can be selected depending on the prevailing conditions in the respective position.
  • a scoring in the edge regions of the roll may have a smaller mutual distance and / or a greater width and / or a greater depth than the scoring in the middle region of the roll.
  • the scoring may also be formed only in the edge regions, which represents a particularly simple and cost-effective variant.
  • the opposite to the central region of the roll different open area and / or the different open volume in the edge regions substantially up to 100 cm, preferably up to 30 cm, more preferably at least 10 cm starting from the terminal Extend edges of the roll cover in the axial direction of the roller. This can ensure that the paper web edges and the edges of the oscillating during operation in the axial direction of clothing always be above the designed with the inventive measures edge areas.
  • a cross-sectional shape of the suction holes in the edge region of the roller can be made conical, whereby a very easy way is opened to increase the open area or the open volume.
  • Fig. 1 is highly schematic of a roll 1, which can be used in a web-making machine such as a paper, board or tissue machine, shown.
  • the measures according to the invention are equally applicable to evacuated and non-evacuated positions, so for example in suction rolls, suction press rolls, pure press rolls or shoe presses. The invention will be described in more detail below with reference to a suction press roll.
  • the roller 1 has a roll shell 2, which may for example consist of metal or of a fiber-reinforced plastic material.
  • a roll cover 3 is formed, which in the usual way may comprise an adhesion-promoting layer, one or more intermediate layers and a functional layer.
  • the roll cover 3 has an outwardly facing working contact surface 4, which may be in contact with a press felt or a wire.
  • the roll 1 may further be closed at the end with roll trays 5 and 5 bearing and / or drive pin 6 have on the roll trays, which serve to support the roll 1 in a machine frame not shown and the introduction of a driving force into the roll 1.
  • the suction press roll 1 cooperates with a corresponding counter roll to form a nip or press nip, where pressure is exerted on the still wet fibrous web and the water is pressed out of the fibrous web and / or sucked.
  • the design of the working contact surface 4 is in addition to the design of the press felt substantially responsible for the extent to which the run through a press fibrous web can be dewatered.
  • surface forms for increasing the open area are introduced into the roll cover 3, in order to provide the water with an escape volume into which it can be taken up from the fibrous web.
  • the surface shapes which may be formed, for example, in the form of blind holes or blind holes and as elongated depressions such as grooves or grooves, then ensure that the water is dissipated by, for example, laterally derived from the evasive volume or discharged in the web running direction in drip pans. The larger the open area resp. the open volume, the more water can be absorbed.
  • FIG. 2 out A known combination of surface forms is exemplary Fig. 2 out.
  • This shows an enlarged section eg in area II in Fig. 1 , wherein the roll cover 3 is shown in section.
  • the illustrated roll 1 is in this case designed as a suction press roll 1 which has through holes 7 serving as suction openings in the roll shell 2 and in the roll cover 3 as well as blind bores 8 formed in the roll cover 3.
  • the roller 1 can in have their interior not shown suction devices such as vacuum suction boxes to suck water from the fibrous web.
  • the through holes 7 are naturally designed so that the respective lying in the roll cover 3 through holes 7 are aligned with their respective counterparts 12 in the roll shell 2.
  • the through holes 7 and the blind holes 8 are usually introduced, for example, by drilling in a uniform pattern in the roll shell 2 and in the roll cover 3.
  • a diameter of the through and blind bores 7, 8 can be made the same size or different sizes depending on the requirements. The choice of the diameter depends, inter alia, on the line load acting in the nip and on the hardness of the roll cover 3, which in turn depends on the choice of material.
  • roll covers 3 made of high-performance polyurethane in a hardness range of about 5 to about 30 P & J are preferably described.
  • a scoring 9 in the working contact surface 4 can be seen, which increases the open portion thereof.
  • the open portion of the working contact surface is about 25%.
  • the groove 9 is usually designed as a single or multi-start spiral groove or in the form of several individual incisions.
  • FIGS. 4A and 4B A preferred embodiment of such improved surface shapes is the highly schematic representations of FIGS. 4A and 4B refer to.
  • FIGS. 4A and 4B the FIGS. 3A and 3B compared, which show the usual features in an identical representation.
  • the FIGS. 3A and 4A are respectively the holes 7, 8 concerned Measures presented (without distinction between blind and suction holes), while the Figs. 3B and 4B the measures concerning the grooving 9 are shown.
  • FIGS. 3A and 4A Supervision to represent appropriate roller covers, while the Figs. 3B and 4B the lower part of the groove 9 in relation to 3 should represent and thus be understood as (exaggerated) sectional drawing. Hatching was omitted for reasons of clarity.
  • the object of the invention is to provide in the edge regions of the roll 1 compared to the middle transverse direction in the cross-machine direction a different sized open area respectively a different sized open volume available to model the drainage behavior accordingly.
  • This can be achieved by the holes 7, 8 by larger diameter blind holes 8 'and / or larger suction holes 7' and / or part of the grooving 9 by a wider and / or deeper groove 9 '.
  • the diameter of the blind bores 8 is normally 2.0 to 2.2 mm, while the larger blind bores 8 'according to the invention can obtain diameters of 2.5 to 4.0 mm.
  • the diameters of the suction holes 7 are usually 2.6 to 3.2 mm and according to the invention for the larger suction holes 7 'diameter of 3.5 to 3.7 mm obtained.
  • the depth of a groove 9 'in the edge region of the roller 1 by up to 40% and preferably by about 20% greater than the depth of the groove 9 in the other areas.
  • the open area in the edge regions of the working contact surface 4 can be increased by approximately 20% by the measures each alone or in combination with each other.
  • the change of the surface shapes advantageously begins about 1000 cm, preferably about 30 cm, more preferably about 10 cm within the region of the roll 1 covered by the fibrous web. This is because of the migration of the fabric in the cross-machine direction - also referred to as oscillation - during operation of the machine necessary to ensure that the string and web edges are always in the area of marginally modified surface shapes. Too broad training of the changed surface forms is however too avoid in order not to achieve in the direction of the center of the roll 1 undesirable side effects such as too different dewatering of the fibrous web or markings.
  • the term "depth" of the groove 9, 9 'relative to the roller surface 4 and not on the Thickness of the reference layer 3 relate.
  • the groove depth can in fact be as deep as in the middle area, since it was indeed laid lower, but was flattened by the crowning. If, by contrast, the depth of the groove is inherently deep everywhere, as is known from the prior art, it is flattened by attaching the crowning, which results in the known problems of too small an open volume with poor drainage, etc.
  • the dimensioning of the grooving 9, 9 ' can be done depending on the forces acting in the press and the dimensions of the roll 1, for example, the deep groove 9' in the edge regions a depth of 1.5 mm to 4 mm at a preferred depth of 3 mm and the shallow groove 9 present in the axially central region have a depth of 0.5 mm to 3 mm at a preferred depth of 1 mm.
  • the width of the groove 9, 9 ' may each be the same and be between 0.5 mm and 2 mm, preferably 0.7 mm.
  • the width of the webs 10 between two creases 9, 9 ' is preferably between 1.4 mm and 4 mm, preferably 2.0 mm.
  • sheet dispensing improves because hydraulic adhesion of the fibrous web to the fabrics is reduced, the surface shapes of the roll are better rinsed, and felt conditioning in the nip is accelerated, preventing densification and fouling of the felt surface and internal structure.
  • the grooving 9 ' can be introduced in addition to or instead of the blind holes 8 in the edge zones to model the drainage behavior in the edge region.
  • groove portions 11 which are separated from one another by webs.
  • the webs may be of different lengths, in particular, the aspect ratio between groove portions 11 and webs is freely selectable.
  • groove sections 11 of equal length can be separated by webs which are shorter, the same length or longer than the groove sections 11.
  • the groove portions 11 may have variable lengths.
  • the groove sections are inclined relative to the roll axis in such a way that they can be arranged approximately parallel to this.
  • a different length of the groove sections is conceivable, for example with Increasing length towards the reference edges in order to increase the open area or the open volume to the outside axially.
  • the groove sections can be arranged parallel to one another or staggered in parallel. It can be provided a single or multi-row training. Corresponding embodiments are Fig. 5 can be seen where left a double-row training from the outside longer and shorter inside groove portions 11 is shown, while right parallel offset but equal-length groove portions are shown.
  • Fig. 6 is a highly schematic sectional view through an exemplary suction hole 7 'is shown, which is made conical in the region of the roll cover 3.
  • suction holes 7 are drilled cylindrically and have a slightly smaller diameter than their counterparts 12 in the roll shell 2.
  • the suction bores 7 ' are bored conically, which is easily possible with corresponding drill shapes, the open area or the open volume can be increased in the simplest manner without additional measures being necessary. All that is required is to prepare the drilling machine differently for drilling in the edge regions of the roller. This measure can also be used for the blind bores 8 '.

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  • Paper (AREA)
EP12188648.5A 2011-10-21 2012-10-16 Rouleau Withdrawn EP2584092A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011084980A DE102011084980A1 (de) 2011-10-21 2011-10-21 Walze

Publications (1)

Publication Number Publication Date
EP2584092A1 true EP2584092A1 (fr) 2013-04-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12188648.5A Withdrawn EP2584092A1 (fr) 2011-10-21 2012-10-16 Rouleau

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EP (1) EP2584092A1 (fr)
DE (1) DE102011084980A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014198657A1 (fr) 2013-06-10 2014-12-18 Voith Patent Gmbh Revêtement de cylindre
CN108660847A (zh) * 2018-05-15 2018-10-16 浙江永鑫特种纸有限公司 皱纹纸造纸机及造纸方法
WO2021254745A1 (fr) * 2020-06-19 2021-12-23 Voith Patent Gmbh Procédé de réglage variable de la capacité de déshydratation d'un dispositif de pressage
CN114645481A (zh) * 2020-12-17 2022-06-21 维美德技术有限公司 用于制造纸、纸板、生活用纸等的辊和装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020102572B4 (de) 2020-02-03 2024-12-19 Voith Patent Gmbh Walzenbezug für eine Maschine zur Herstellung oder Veredlung einer Faserstoffbahn

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1000391A (en) * 1910-12-20 1911-08-15 Bion B Farnham Suction-roll for paper-machines.
DE3828179A1 (de) * 1988-08-19 1990-02-22 Voith Gmbh J M Presswalze fuer die pressenpartie einer papiermaschine
EP1103654B1 (fr) 1999-10-19 2006-06-21 Voith Paper Patent GmbH Rouleau
DE102005017794A1 (de) * 2005-04-14 2006-10-19 Voith Patent Gmbh Walze
WO2008090258A1 (fr) * 2007-01-22 2008-07-31 Metso Paper, Inc. Système dans une section de séchoir d'une machine de formation de bande pour guider un tissu puis la bande avec des rouleaux de guidage
DE102007024846A1 (de) * 2007-05-29 2008-12-04 Voith Patent Gmbh Saugwalze

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4024955A1 (de) * 1990-08-07 1992-02-13 Voith Gmbh J M Umlenkwalze zur verwendung vorzugsweise in einer ein-sieb-trockengruppe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1000391A (en) * 1910-12-20 1911-08-15 Bion B Farnham Suction-roll for paper-machines.
DE3828179A1 (de) * 1988-08-19 1990-02-22 Voith Gmbh J M Presswalze fuer die pressenpartie einer papiermaschine
EP1103654B1 (fr) 1999-10-19 2006-06-21 Voith Paper Patent GmbH Rouleau
DE102005017794A1 (de) * 2005-04-14 2006-10-19 Voith Patent Gmbh Walze
WO2008090258A1 (fr) * 2007-01-22 2008-07-31 Metso Paper, Inc. Système dans une section de séchoir d'une machine de formation de bande pour guider un tissu puis la bande avec des rouleaux de guidage
DE102007024846A1 (de) * 2007-05-29 2008-12-04 Voith Patent Gmbh Saugwalze

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014198657A1 (fr) 2013-06-10 2014-12-18 Voith Patent Gmbh Revêtement de cylindre
CN108660847A (zh) * 2018-05-15 2018-10-16 浙江永鑫特种纸有限公司 皱纹纸造纸机及造纸方法
WO2021254745A1 (fr) * 2020-06-19 2021-12-23 Voith Patent Gmbh Procédé de réglage variable de la capacité de déshydratation d'un dispositif de pressage
CN114645481A (zh) * 2020-12-17 2022-06-21 维美德技术有限公司 用于制造纸、纸板、生活用纸等的辊和装置
EP4015705A1 (fr) * 2020-12-17 2022-06-22 Valmet Technologies Oy Rouleau et agencement de fabrication de papier, de panneau, de tissus ou similaire

Also Published As

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