WO2014198657A1 - Revêtement de cylindre - Google Patents

Revêtement de cylindre Download PDF

Info

Publication number
WO2014198657A1
WO2014198657A1 PCT/EP2014/061818 EP2014061818W WO2014198657A1 WO 2014198657 A1 WO2014198657 A1 WO 2014198657A1 EP 2014061818 W EP2014061818 W EP 2014061818W WO 2014198657 A1 WO2014198657 A1 WO 2014198657A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll cover
roll
cover according
mixtures
polyurethane
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.)
Ceased
Application number
PCT/EP2014/061818
Other languages
German (de)
English (en)
Inventor
Sarah LIPPL
Michael Wokurek
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 WO2014198657A1 publication Critical patent/WO2014198657A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls

Definitions

  • the invention relates to a roll cover for use in a machine for the production, further processing and / or finishing of a fibrous web such as a paper, board or tissue web according to the preamble of claim 1.
  • press and suction press rolls are used to dewater the fiber web.
  • the rollers used are usually provided with a roll cover made of polyurethane for this application.
  • the duration of use of such a polyurethane roll cover depends, inter alia, on the wear resistance of the polyurethane.
  • the dewatering capacity is adjustable above all by the design of the surface of the roll cover. Surface shapes such as grooves, suction and blind bores are commonly incorporated to increase the capacity for water absorption and drainage.
  • roller coverings of this type are apparent, for example, from EP2584092A1.
  • a roller is described for a machine for producing a material web, in particular for a paper, board or tissue machine, which comprises a cylindrical roll shell and an elastic roll cover covering the surface of the roll shell with an outwardly facing work contact surface, surface forms in the work contact surface are provided which define in their entirety an open area and / or an open volume.
  • the surface shapes have in the axial length of the roller-related edge regions to a middle region of different sized open area and / or a different sized open volume.
  • a roll cover with the characterizing features of claim 1 in conjunction with the generic features.
  • the polyurethane comprises at least one polyol which is selected from: polyethers having a molecular weight of 250 to 3000 g / mol, polybutadienes having a molecular weight of 250 to 3000 g / mol or polycarbonates having a molecular weight of 250 to 3000 g / mol or Mixtures thereof.
  • the polyols may be mixed in their nature and / or in their molecular weight.
  • the latter has shown a surprisingly strong influence on the properties of the polyurethane.
  • the polyurethane may contain a diisocyanate which is selected from aromatic or aliphatic diisocyanates or mixtures thereof.
  • the diisocyanate may be selected from: diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate or mixtures thereof.
  • the polyurethane may further contain a chain extender or crosslinker selected from: diamines, diols, trifunctional products or mixtures thereof.
  • the chain extender or crosslinker may be selected from: MCDEA, MOCA, 1,4-butanediol, trimethylolpropane.
  • the roll cover has a working contact surface facing the fiber web, in which surface forms may be provided which in their entirety define an open area and / or an open volume.
  • the surface shapes may be selected from: grooves, blind holes, suction holes or combinations thereof.
  • the drainage performance of the roll cover can be optimized.
  • the roll cover according to the invention can be made in a hardness of 3 to 40 according to Pusey & Jones (P & J).
  • the roller may preferably be designed as a press roll or as a suction press roll.
  • Rollers are found in fibrous web machines such as paper, board or tissue machines in many positions. They serve at different positions for different purposes such as the guidance and deflection of the fiber web and the fiber web transporting paper machine clothing as well as the drainage, equalization and smoothing of the fiber web.
  • the dewatering by means of rollers takes place in particular in the press section of a fiber web machine, where the fibrous web passes through one or more so-called press nips between two or more rolls after initial dewatering in the forming section together with one or more paper machine clothing such as press felts or conveyor belts and thereby by pressure and / or suction is further dewatered to a desired solids content.
  • the rollers usually have a roller core made of a solid material such as metal or fiber-reinforced plastic and arranged on the roller core and this surrounding roller cover. This may be hard or soft depending on position and function and may consist of a polymer such as polyurethane or of a rubber material, for example.
  • the dewatering takes place on the one hand on the water absorbency of paper machine clothing, which are usually multi-layered and can absorb and store a certain amount of water from the fiber web in their individual layers, and to a greater extent by pressing or suction press rolls on one of the fiber web facing working contact surface of the roll cover have surface shapes that define in their entirety an open area or an open volume, which is a measure of the Dewatering capacity of the roller represents.
  • Suction press rolls are also pressurized from the inside with a vacuum and take through corresponding holes on the water from the fiber web.
  • Such surface shapes are usually formed in the form of grooves and holes.
  • the grooves can be made spirally or as single stitches.
  • the holes may be formed as blind or blind holes, which are formed only in the roll cover, or as the roll cover and the roll shell by cross suction holes.
  • paper machine clothing which bridges the open surface of the roll cover, also breaks into wide surface forms.
  • the paper machine clothing thus depends on the surface shapes, which can also lead to undesirable marks, which are visible in the final product and affect its quality. It is thus desirable to make the roll cover so that the lands between the surface shapes are more stable and are not easily deformed or broken under load.
  • the general wear resistance of the roll cover can also be increased with these measures.
  • the hydrolysis resistance of the roll cover should not suffer from the measures according to the invention.
  • the particular wear resistance of a roll cover can be modeled by the appropriate selection of the polyurethane and in particular by the selection of the polyols, which form a main component of the polymer.
  • Suitable polyols for the production of such roll covers are polyethers having a molecular weight of 250 to 3000 g / mol, polybutadienes having a molecular weight of 250 to 3000 g / mol or polycarbonates having a molecular weight of 250 to 3000 g / mol.
  • Polyether provides a very good hydrolysis resistance, but is only partially firm and resistant.
  • polyester is very strong and resistant, very resistant to abrasion, but has poor resistance to hydrolysis.
  • Polycarbonate is characterized by a high strength and resistance and by a good hydrolysis resistance.
  • the polyurethane must contain a diisocyanate which is selected from aromatic or aliphatic diisocyanates or mixtures thereof. Particularly suitable are diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate or mixtures thereof.
  • the polyurethane contains a chain extender or crosslinker selected from diamines, diols, trifunctional products or mixtures thereof. Particularly suitable are MCDEA, MOCA, 1, 4-butanediol, trimethylolpropane or mixtures thereof.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un revêtement de cylindre pour un cylindre destiné à une machine permettant de produire une bande de matériau, en particulier une machine à papier, à carton ou à papier ouaté, ce cylindre étant pourvu d'une chemise cylindrique. La surface de la chemise du cylindre est recouverte au moins par endroits d'un revêtement, ce revêtement de cylindre étant élastique et constitué au moins par endroits d'un polyuréthane. Le polyuréthane comprend au moins un polyol, lequel est choisi dans un groupe constitué par : le polyéther pourvu d'un poids moléculaire de 250 à 3000 g/mol, le polybutadiène pourvu d'un poids moléculaire de 250 à 3000 g/mol ou les polycarbonates pourvus d'un poids moléculaire de 250 à 3000 g/mol ou leurs mélanges.
PCT/EP2014/061818 2013-06-10 2014-06-06 Revêtement de cylindre Ceased WO2014198657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013210735 2013-06-10
DE102013210735.8 2013-06-10

Publications (1)

Publication Number Publication Date
WO2014198657A1 true WO2014198657A1 (fr) 2014-12-18

Family

ID=50896308

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/061818 Ceased WO2014198657A1 (fr) 2013-06-10 2014-06-06 Revêtement de cylindre

Country Status (1)

Country Link
WO (1) WO2014198657A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018118052A1 (de) * 2018-07-26 2020-01-30 Voith Patent Gmbh Mantel, dessen Verwendung für eine Breitstreckwalze und Breitstreckwalze
WO2022223162A1 (fr) * 2021-04-19 2022-10-27 Voith Patent Gmbh Polyuréthane, revêtement de rouleau et procédé de production
US20240076833A1 (en) * 2021-05-12 2024-03-07 Voith Patent Gmbh Roll cover and roll

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087231A (en) * 1960-11-08 1963-04-30 Us Rubber Co Paper mill rolls
EP0053804A2 (fr) * 1980-12-04 1982-06-16 Kinyosha Co. Ltd. Rouleau de pression
US20050208288A1 (en) * 2004-03-16 2005-09-22 Cheng-Kuang Li Belts and roll coverings having a nanocomposite coating
EP2584092A1 (fr) 2011-10-21 2013-04-24 Voith Patent GmbH Rouleau

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087231A (en) * 1960-11-08 1963-04-30 Us Rubber Co Paper mill rolls
EP0053804A2 (fr) * 1980-12-04 1982-06-16 Kinyosha Co. Ltd. Rouleau de pression
US20050208288A1 (en) * 2004-03-16 2005-09-22 Cheng-Kuang Li Belts and roll coverings having a nanocomposite coating
EP2584092A1 (fr) 2011-10-21 2013-04-24 Voith Patent GmbH Rouleau

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018118052A1 (de) * 2018-07-26 2020-01-30 Voith Patent Gmbh Mantel, dessen Verwendung für eine Breitstreckwalze und Breitstreckwalze
WO2022223162A1 (fr) * 2021-04-19 2022-10-27 Voith Patent Gmbh Polyuréthane, revêtement de rouleau et procédé de production
CN117255819A (zh) * 2021-04-19 2023-12-19 福伊特专利有限公司 聚氨酯、辊覆盖物和制造方法
US20240076833A1 (en) * 2021-05-12 2024-03-07 Voith Patent Gmbh Roll cover and roll

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