EP3786358A1 - Rouleau pour une machine à papier et son utilisation - Google Patents

Rouleau pour une machine à papier et son utilisation Download PDF

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Publication number
EP3786358A1
EP3786358A1 EP20189602.4A EP20189602A EP3786358A1 EP 3786358 A1 EP3786358 A1 EP 3786358A1 EP 20189602 A EP20189602 A EP 20189602A EP 3786358 A1 EP3786358 A1 EP 3786358A1
Authority
EP
European Patent Office
Prior art keywords
roller
layer
roll
rubber
cover
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.)
Pending
Application number
EP20189602.4A
Other languages
German (de)
English (en)
Inventor
Stefan Pollaschek
Franz Grohmann
Peter PUTSCHÖGL
Jörg Schauberger
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 EP3786358A1 publication Critical patent/EP3786358A1/fr
Pending 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 roll for a paper machine, for the production or further processing of a fibrous web, such as a paper, cardboard or tissue web, the use of such a roll and a paper machine comprising such, in detail according to the features of the independent claims.
  • Rollers of this type are present in a large number of positions and with a large number of functions in the paper machine mentioned at the beginning.
  • rolls with comparatively soft cover layers are suitable for pressing and dewatering the fibrous web
  • rolls with comparatively hard surfaces in particular with a heating device, are primarily used for smoothing and drying the fibrous web.
  • Suction press rolls for example, are used to dewater the fibrous web. These include a roll cover arranged on a roll core.
  • the roll core and roll cover have through-bores which are connected to a corresponding suction device in order to remove water from the fibrous web via the through-bores.
  • the suction press rolls with a corresponding press roll form a press nip, that is, a press nip, through which the fibrous web is passed for its dewatering.
  • the present invention relates, inter alia, to such generic suction press rolls.
  • roller cover In order to meet the high demands on drainage, mechanical and chemical properties, elastomers, e.g. on a rubber basis, are used for the roller cover. It is therefore often necessary for roll covers to be built up from several layers. This structure is time-consuming and therefore costly.
  • metals such as stainless steel or bronze are used for the roller core.
  • a barrier for example in the form of a paint or a coating, is necessary. This barrier is intended to prevent the sulfur from the rubber from reacting with the copper from the bronze during the vulcanization of the roll cover. This would lead to poor adhesion between the roll core and the roll cover.
  • the object of the invention to provide a roll, its use and a paper machine comprising such a roll, which are improved over the prior art.
  • the adhesion of the roll cover to the roll core is to be increased and a roll that can be manufactured more economically is to be specified.
  • the inventors have recognized that by providing a roller in which the roller cover is applied to the roller core and the radially innermost layer, i.e. the binding layer of the roller cover, is made of a peroxide crosslinked rubber, instead of a sulfur crosslinked rubber, the problems mentioned above in particular can be avoided in the case of roller cores made of bronze.
  • the base layer which for example directly adjoins the radially outer surface of the binding layer, can then be made of such a sulfur-crosslinked rubber, preferably an acrylonitrile-butadiene rubber (NBR), and thus form a hard rubber.
  • NBR acrylonitrile-butadiene rubber
  • the sulfur-containing base layer is separated from the roller core, which has bronze, for example, by the peroxide-linked binding layer.
  • an NBR rubber can also be used for the binding layer.
  • an adhesion promoter can be provided between the roller core and the roller cover.
  • functional layer in the context of the present invention means a layer which comes into direct contact with the fibrous web or indirectly, for example via conveyor belts, such as felts or sieves, arranged between the fibrous web and the functional layer.
  • a binding layer is understood to mean a layer which serves to promote adhesion between the roll core on the one hand and the actual roll cover.
  • Both the binding layer and the functional layer are thus part of the firm roll cover that has already been applied to the roll and is successively applied to the roll core during manufacture.
  • Functional and / or binding layer can be built up from a plurality of individual layers.
  • the roll for a paper machine for the production or further processing of a fibrous web, such as a paper, cardboard or tissue web
  • a metallic roll core and a roll cover applied to the roll core the roll cover having several in each case has layers arranged radially one above the other as viewed on the longitudinal axis of the roller, namely a radially innermost binding layer and a radially outer supporting layer, the binding layer being made of a peroxidically crosslinked rubber.
  • the base layer is made of a hard rubber, that is to say a rubber crosslinked with sulfur, and the rubber is preferably an acrylonitrile-butadiene rubber (NBR).
  • the roller cover has a radially outermost functional layer which is made from a peroxidically crosslinked rubber.
  • a roller cover can be produced simply and inexpensively. If a roller core made of bronze is also used, this prevents sulfur from the material of the base layer from reacting with the copper of the bronze during vulcanization, i.e. the manufacture of the roller cover.
  • the invention also relates to the use of a roll according to the invention for a paper machine for the production or further processing of a fibrous web, such as a paper, cardboard or tissue web.
  • the invention also relates to a paper machine for the production or further processing of a fibrous web, such as a paper, cardboard or tissue web, the paper machine having at least one roller according to the invention.
  • the paper machine is preferably set up to produce a tissue web.
  • the fibrous web 2 to be dried and creped, here the tissue web is transported on a covering, coming from the bottom right, and transferred to a heated or heatable drying cylinder 3, such as a Yankee cylinder.
  • the transfer takes place via a roller 6, here designed as a suction press roller.
  • the roller 6 is placed with its radially outermost surface on the radially outermost surface of the drying cylinder 3.
  • the suction press roll 6 has suction via a suction device (not shown) to generate a vacuum in order to dewater the fibrous web 2 in the press nip 5.
  • the tissue web 2 is dried on the drying cylinder 3 and then detached from the surface of the drying cylinder 3 by creping by means of a creping doctor 4.
  • Fig. 2 is in a schematic, not to scale cross-section through the longitudinal axis 6.1 of the roller 6, as they are in a paper machine of Fig. 1 could be used, shown.
  • the roller 6 comprises a roller core 7 and a roller cover 8 applied to the radially outer surface of the roller core 7.
  • the roller core 7 and the roller cover 8 have a plurality of bores 10 communicating with one another - here shown exaggeratedly large. The latter are arranged distributed on the circumference of the roller 6 and in the present case are designed as through bores.
  • the water exiting from the fibrous web 2 in the press nip 5 can be removed via the bores 10 by the suction device (not shown).
  • the roll cover 8 of the roll 6 can be multi-layered, with the individual layers in the radial direction of the roll 6 - relative to its longitudinal axis 6.1 being able to be arranged from radially inside to radially outside as follows: a binding layer 8.1, a base layer 8.2, an intermediate layer 8.3 and a functional layer 8.4.
  • a binding layer 8.1 represents the radially innermost layer
  • the functional layer 8.4 represents the radially outermost layer of the roller cover 6.
  • An adhesion promoter 9 can be applied between the radially outermost surface of the roller core 7 and the radially innermost surface of the roller cover 8. Both the provision of the adhesion promoter 9 and the intermediate layer 8.3 are optional.
  • the intermediate layer 8.3 can, for example, be made from a peroxide crosslinked rubber.
  • the intermediate layer 8.3 is made of the same material as the binding layer 8.1.
  • Both the binding layer 8.1 and the base layer 8.2 can be made from an acrylonitrile-butadiene rubber (NBR).
  • NBR acrylonitrile-butadiene rubber
  • the binding layer 8.1 is then crosslinked peroxidically to form a rubber and the base layer 8.2 is crosslinked with sulfur to form a hard rubber.
  • the object of the invention is achieved to a particularly good extent when the proportion of sulfur in the base layer is greater than 10% by weight.
  • the advantages according to the invention also result if the glass transition temperature of the material of the base layer 8.1 is greater than the use temperature of the roller 6, while the glass transition temperature of the material of the binding layer 8.1 can preferably be lower than the use temperature of the roller 6.
  • the thickness of the binding layer can be 1 to 2 mm, the thickness of the base layer 1 to 5 mm, the thickness of the intermediate layer 1 to 2 mm and the thickness of the functional layer 5 to 30 mm. In order to achieve this thickness of the functional layer, it can in turn be composed of several, less thick individual layers. The thickness of each individual layer is measured in the radial direction in relation to the longitudinal axis 6.1 of the roller 6 (in a section through the longitudinal axis 6.1).
  • the intermediate layer 8.3 adjoins the functional layer 8.4 on the one hand and directly on the base layer 8.2 on the other hand.

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  • Paper (AREA)
EP20189602.4A 2019-08-30 2020-08-05 Rouleau pour une machine à papier et son utilisation Pending EP3786358A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019123284.8A DE102019123284A1 (de) 2019-08-30 2019-08-30 Walze für eine Papiermaschine, deren Verwendung sowie Papiermaschine

Publications (1)

Publication Number Publication Date
EP3786358A1 true EP3786358A1 (fr) 2021-03-03

Family

ID=71950506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20189602.4A Pending EP3786358A1 (fr) 2019-08-30 2020-08-05 Rouleau pour une machine à papier et son utilisation

Country Status (2)

Country Link
EP (1) EP3786358A1 (fr)
DE (1) DE102019123284A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1116821A2 (fr) * 1999-11-24 2001-07-18 Schäfer KG Courroie de pressage, bande de pressage ou revêtement pour rouleau
US20070111871A1 (en) * 2005-11-08 2007-05-17 Butterfield William S Abrasion-resistant rubber roll cover with polyurethane coating
WO2018019816A1 (fr) * 2016-07-29 2018-02-01 Voith Patent Gmbh Revêtement de cylindre, et cylindre et son utilisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20060636A (fi) * 2006-06-30 2007-12-31 Metso Paper Inc Pinnoitettu tela
DE102007011659A1 (de) * 2007-03-09 2008-09-11 Voith Patent Gmbh Dichtleiste

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1116821A2 (fr) * 1999-11-24 2001-07-18 Schäfer KG Courroie de pressage, bande de pressage ou revêtement pour rouleau
US20070111871A1 (en) * 2005-11-08 2007-05-17 Butterfield William S Abrasion-resistant rubber roll cover with polyurethane coating
WO2018019816A1 (fr) * 2016-07-29 2018-02-01 Voith Patent Gmbh Revêtement de cylindre, et cylindre et son utilisation

Also Published As

Publication number Publication date
DE102019123284A1 (de) 2021-03-04

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