EP4337825A1 - Revêtement de rouleau et rouleau - Google Patents

Revêtement de rouleau et rouleau

Info

Publication number
EP4337825A1
EP4337825A1 EP22718934.7A EP22718934A EP4337825A1 EP 4337825 A1 EP4337825 A1 EP 4337825A1 EP 22718934 A EP22718934 A EP 22718934A EP 4337825 A1 EP4337825 A1 EP 4337825A1
Authority
EP
European Patent Office
Prior art keywords
roll cover
less
elastomeric material
roll
roller
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
EP22718934.7A
Other languages
German (de)
English (en)
Inventor
Franz Grohmann
Nina EGGERS
Anton HORAK
Stefan Pollaschek
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 EP4337825A1 publication Critical patent/EP4337825A1/fr
Pending 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
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls
    • 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

Definitions

  • the invention relates to a roll cover for a roll, in particular for use in a plant for the production or processing of a fibrous web according to the preamble of claim 1, and a corresponding roll.
  • a large number of rollers are used in industrial plants such as paper machines. These rollers can be used to guide the material web or to influence the surface properties. Another important application of such rollers is the pressing and dewatering of the fibrous web.
  • US Pat. No. 9,488,217 proposes that the grooves and bores be made very wide in relation to their depth. Specifically, it is suggested there that the width between the diameter is at least 70% of the depth or more.
  • the present invention aims to overcome the problems known in the prior art.
  • material web fibrous web and paper web are used synonymously in this application. This should include in particular cellulose webs, webs for graphic paper or packaging paper, cardboard webs, tissue webs and webs of special papers.
  • the object is completely achieved by a roll cover for a roll, in particular for use in a plant for the production or processing of a fibrous web, the roll cover comprising a radially outer functional layer which provides the surface of the roll cover that comes into contact with the web, and the functional layer Has structural elements in particular in the form of grooves and / or holes.
  • the functional layer is composed of an elastomer material that has a Poisson's ratio of more than 0.4.
  • the elastomeric material has a Poisson's ratio between 0.45 and 0.5, for example 0.47, 0.48 or 0.49.
  • a rubber material in particular a rubber formulation based on HNBR (hydrogenated acrylonitrile butadiene rubber) or EPDM (ethylene propylene diene rubber) is used as the elastomer material.
  • HNBR hydrogenated acrylonitrile butadiene rubber
  • EPDM ethylene propylene diene rubber
  • other elastomeric materials such as polyurethanes can also be used.
  • Poisson's number also called Poisson's ratio, Poisson's ratio or Poisson's ratio
  • Poisson's ratio is a material parameter in mechanics or strength of materials. It is used to calculate the transverse contraction and is one of the elastic constants of a material.
  • the Poisson's ratio is defined as the linearized negative ratio of the relative change in dimension transverse to the uniaxial direction of stress to the relative change in length under the influence of a one-dimensional mechanical stress state:
  • the roll covers are often operated at temperatures between 50°C and 60°C, it would be desirable to also determine the Poisson's ratio at these operating temperatures.
  • the effort involved in appropriately controlling the temperature of the measuring device is relatively high. Therefore, the Poisson's ratios that are in the frame - 4 - of this application are measured under laboratory conditions, ie at 20 ° C.
  • the Poisson's ratio hardly changes over a large temperature range. Significant changes can only be expected below the glass transition temperature, which is in the range of -20°C for such elastomers, or above 80°C - 100°C. Therefore, a measurement at 20°C is also representative for use at 50°- 60°C.
  • the Poisson's ratio measured in the tensile test is dependent on the tensile speed at which the test is carried out. At low speeds (e.g.: 10 mm/min), relaxation effects also occur and are also recorded, which are not relevant for the very rapid deformation that occurs in practice in the press nip - at speeds greater than 100 mm/min, no significant speed dependency was found.
  • the measured values described were therefore determined with a speed of 125mm/min, a preload of 1N in the range of 1.5 - 2.5% elongation and a measuring length (Lo) of 25mm in the case of the S1 rod and 20mm in the case of the S2 rod. Due to the scatter of the measured values, the median of at least 3, ideally at least 5, individual measurements was used.
  • the inventors have recognized that the material behavior of a roll cover in a treatment gap can be characterized very well by this material index.
  • an elastomer material in particular a rubber material, with a Poisson's ratio above 0.4, in particular between 0.45 and 0.5, there are no or only slight undesirable material deformations even at relatively high pressures in the treatment gap. This gives you a great deal of freedom to introduce structures into the surface of the roll cover. These structures are then not changed or only slightly changed in the treatment gap and their storage volume is largely retained.
  • the roll cover has grooves as structural elements, and the ratio of the groove width - 5 - to the groove depth is less than or equal to 0.7, in particular less than or equal to 0.68, 0.65, 0.6 or 0.5
  • the roll cover has bores as structural elements, and the ratio of the bore diameter to the bore depth is less than or equal to 0.7, in particular less than or equal to 0.68, 0.65, 0.6 or 0.5.
  • the groove width and/or the bore diameter is between 0.7 mm and 1.4 mm, preferably between 0.8 mm and 1.1 mm.
  • the groove depth and/or borehole depth is between 1.2mm and 2.5mm, in particular between 1.8mm and 2.2mm.
  • a groove width of 1.1mm and a groove depth of 2mm gives a ratio of 0.55.
  • a groove width of 0.8mm and a groove depth of 2.5mm results in a ratio of 0.32.
  • Roll covers according to aspects of the present invention also allow large open areas of up to 40% or 45% to be provided in the roll cover.
  • the open area can be 28%, 33% or 34%.
  • An open area of 33.3% means that with a groove width of 1mm, the lands between the grooves have a width of 2mm.
  • a soft roller cover can be provided.
  • the flatness of the functional layer is over 10 P&J, in particular between 15 P&J and 50 P&J. hardness values of 20 P&J, 6
  • P&J 25 P&J, 30 P&J or 35 P&J are common. Hardening of this type can be achieved very easily specifically with a rubber material, in particular a rubber formulation based on HNBR (hydrogenated acrylonitrile butadiene rubber) or EPDM (ethylene propylene diene rubber).
  • HNBR hydrogenated acrylonitrile butadiene rubber
  • EPDM ethylene propylene diene rubber
  • P & J refers to the measurement according to Pusey & Jones. In this measurement, softer materials have higher P & J values.
  • the statement that a roller cover has a hardness of more than 10 P&J means that the cover should be softer than 10 P&J.
  • the rolls, and in particular the roll covers are exposed to very harsh conditions when they are used, e.g. in a paper machine.
  • Mechanical influences such as the pressure in a nip and also friction, but also the chemical influence of the various process waters and process chemicals lead to constant wear of the roll cover.
  • a certain ratio e.g. width/depth ⁇ 0.7 or ⁇ 0.6mm
  • this wear is disturbing. For example, if % of the thickness of the cover is removed due to wear, while the width of the structure remains the same, the width/depth ratio increases by 1/3. As a result, there is a risk that the width/depth ratio is no longer in the desired range.
  • rollers can also change the properties of the material of the roller covers.
  • the material or the roller surface may harden or soften, for example.
  • the elastomeric material in particular in the case of a rubber material, has one, several or all of the following properties:
  • Property 2 Acid Resistance
  • An elastomeric material should be referred to as acid-resistant in the context of this application if the hardness of the elastomeric material increased by a maximum of 5 P&J, preferably 3 P&J, in particular 1 P&J or less changes.
  • the products that can provide constant dewatering performance show consistency over a wide range of media.
  • a rubber material can be used as the elastomeric material, which has all four properties, or at least properties 1, 2 and 3 together.
  • the object is achieved by a roller for a plant for producing or processing a fibrous web comprising an essentially cylindrical roller core and a roller cover applied thereto, the roller cover being designed according to one aspect of the invention. The invention is explained further below with the aid of examples.
  • the examples give some examples of elastomers suitable for use in a roll cover according to one aspect of the invention. These are different rubber materials. The invention is not limited to these example formulations either.
  • Example recipe 2 HNBR 20
  • this rubber material Before storage, this rubber material has a hardness between 20 and 25 P&J.
  • the elastomeric material has a Poisson's ratio above 0.4, in particular between 0.45 and 0.5.
  • the materials are all suitable for use in a roll cover according to one aspect of the present invention.
  • example formulation 1 EPDM 25
  • example formulation 2 HNBR 20
  • HNBR 20 shows only a relatively small change in hardness in all storage conditions.
  • the material is therefore very water-resistant, acid-resistant and alkali-resistant. Nevertheless, the measured change in hardness is already about twice as large as with formulation 1.
  • the reference formulation NBR 20 shows by far the greatest changes in hardness. When stored in caustic soda, the change in hardness is 10 P&J. - 11
  • FIG. 1 shows the relative changes in the modulus 10 value for the materials from Examples 1 and 2 and the reference material when stored in various media for 7 or 28 days (672 hours).
  • HNBR also shows advantageous properties. Both when stored in water and in sulfuric acid, the change in the modulus 10 value remains below 10% or even below 8%. Only when stored in sodium hydroxide solution is the module 10 value after 28 days only around 80% of the initial value.
  • NBR 20 performs worst here as well. When stored in water, there is already a strong change in elongation after 7 days, and after 28 days it is around 10%. When stored in sulfuric acid or caustic soda, the module 10 value of NBR 20 drops massively. After 28 days of storage in sulfuric acid, the value is only between 50% and 60% of the initial value.
  • NBR 20 With regard to the modulus 10 value, the use of NBR 20 will not be optimal in many applications, so that alternatives as described in Examples 1 and 2 are to be preferred here as well.

Landscapes

  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Abstract

L'invention concerne un revêtement de rouleau et un rouleau, en particulier pour une utilisation dans une installation de production ou de traitement de bande fibreuse. Le revêtement de rouleau comporte une couche fonctionnelle radialement externe qui représente la surface du revêtement de rouleau qui est en contact avec la bande, et la couche fonctionnelle comporte des éléments structurels, en particulier sous la forme de rainures et/ou d'alésages, la couche fonctionnelle étant constituée d'un matériau élastomère dont le coefficient de Poisson est supérieur à 0,4, en particulier compris entre 0,45 et 0,5.
EP22718934.7A 2021-05-12 2022-03-29 Revêtement de rouleau et rouleau Pending EP4337825A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021112370.4A DE102021112370A1 (de) 2021-05-12 2021-05-12 Walzenbezug und Walze
PCT/EP2022/058221 WO2022238042A1 (fr) 2021-05-12 2022-03-29 Revêtement de rouleau et rouleau

Publications (1)

Publication Number Publication Date
EP4337825A1 true EP4337825A1 (fr) 2024-03-20

Family

ID=81386968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22718934.7A Pending EP4337825A1 (fr) 2021-05-12 2022-03-29 Revêtement de rouleau et rouleau

Country Status (4)

Country Link
US (1) US20240068164A1 (fr)
EP (1) EP4337825A1 (fr)
DE (1) DE102021112370A1 (fr)
WO (1) WO2022238042A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI100314B (fi) * 1992-02-06 1997-11-14 Valmet Paper Machinery Inc Paperikoneen telan pinnoittaminen ja telan pinnoite
FI20115400A7 (fi) * 2011-04-26 2012-10-27 Metso Paper Inc Telapinnoite ja menetelmä sen valmistamiseksi
CN106062274A (zh) 2013-09-20 2016-10-26 斯托·伍德沃德许可有限责任公司 带有宽凹槽的软橡胶辊罩
CN106192535B (zh) * 2016-07-22 2017-11-14 福建省联盛纸业有限责任公司 一种纸张压榨装置
FI128303B (en) * 2017-11-28 2020-03-13 Valmet Technologies Oy ROLLER AND ITS USE

Also Published As

Publication number Publication date
US20240068164A1 (en) 2024-02-29
DE102021112370A1 (de) 2022-11-17
WO2022238042A1 (fr) 2022-11-17

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