WO2013107721A1 - Revêtement de cylindre contenant une charge minérale et une charge polymère - Google Patents

Revêtement de cylindre contenant une charge minérale et une charge polymère Download PDF

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Publication number
WO2013107721A1
WO2013107721A1 PCT/EP2013/050634 EP2013050634W WO2013107721A1 WO 2013107721 A1 WO2013107721 A1 WO 2013107721A1 EP 2013050634 W EP2013050634 W EP 2013050634W WO 2013107721 A1 WO2013107721 A1 WO 2013107721A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll cover
roll
cover according
particles
particle diameter
Prior art date
Application number
PCT/EP2013/050634
Other languages
German (de)
English (en)
Inventor
Franz Grohmann
Michael Wokurek
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
Priority claimed from DE201210200791 external-priority patent/DE102012200791A1/de
Priority claimed from DE201210205899 external-priority patent/DE102012205899A1/de
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2013107721A1 publication Critical patent/WO2013107721A1/fr

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
    • 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
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed

Definitions

  • the present invention relates to a roll cover in particular for a roll for treating a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, a roll comprising this roll cover and the use of such a roll.
  • rolls and in particular rolls having an elastic surface are used in a plurality of process steps, such as sheet formation in the wire section of the paper machine, dewatering in the press section of the paper machine, and brushing, drying and smoothing in the paper machine End part of the paper machine.
  • process steps such as sheet formation in the wire section of the paper machine, dewatering in the press section of the paper machine, and brushing, drying and smoothing in the paper machine End part of the paper machine.
  • the surfaces of the rollers are in almost constant contact with the paper webs, which is why they must have, inter alia, a high mechanical resistance and in particular a high wear resistance. Besides, they must have a high resistance to the formation of scratches thereon, a high impact strength, a good tear strength, a high compression strength and a sufficiently high hardness.
  • rolls are usually provided on their surface with a roll cover arranged on a roll core, the material of which is formulated with regard to the required application properties.
  • a roll cover arranged on a roll core, the material of which is formulated with regard to the required application properties.
  • Surfaces of rolls used, for example, in painting in the end portion of a paper machine are also in contact with a coater, such as a doctor bar, which is used to uniformize and spread the coating medium applied to the roll surface To ensure the roll surface a uniformly thick film of coating medium.
  • a coater such as a doctor bar
  • the roll surfaces must not be too abrasive in this application.
  • the roll surfaces themselves must be sufficiently resistant to abrasion, have a high resistance to the formation of scratches thereon and high wear resistance.
  • the roll surfaces must have a defined roughness, since this determines the absorption capacity of the rollers for the coating medium, and this defined roughness must be maintained as possible for a long operating time, because otherwise the capacity of the rollers for the coating medium and thus the transfer amount of coating agent on the paper web changed.
  • One or more elastomers or, in some cases, composites containing a matrix of an elastomer or a mixture of two or more elastomers in which one or more fillers are embedded are typically used to make elastic roll covers.
  • the incorporation of mineral fillers, such as silica and silicates, in the polymer matrices of the roll covers can increase the resistance of roll covers to the formation of scratches on them.
  • mineral fillers are very hard.
  • mineral fillers with a comparatively small diameter must always be used in roll covers because larger rolls oriented on the roll surface must be used. te filler particles protrude from the roll reference surface and impress in the operation of the rollers in the thus contacted pulp or paper web. Apart from that, larger particles of mineral filler in the roll surface in the operation of the roll are too abrasive on coating equipment, such as doctor bars, which reduces their life.
  • the object of the present invention is therefore to provide a roll cover which has excellent abrasion resistance and high wear resistance, which maintains its initial surface roughness constant even over a long period of operation, and at the same time by a high resistance to the formation of scratches on the surface distinguished.
  • the roll cover should not exert too high an abrasive action on doctor bars or other spreading devices and should have a sufficiently high hardness, a sufficiently high impact strength, a good tensile strength and a good compressive strength.
  • the roll cover should be easy and inexpensive to produce.
  • a roll cover in particular for a roll for treating a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, which comprises at least one preferably its surface forming layer , which contains a matrix of at least one elastomer, in which particles of at least one inorganic filler having a mean particle diameter (dso) of at most 50 ⁇ m and particles of at least one polymer filler are embedded.
  • the addition of the particles of the at least one inorganic filler having a mean particle diameter (dso) of at most 50 ⁇ good abrasion resistance, good wear resistance and in particular a high resistance to the formation of scratches on the surface of the roll cover causes wearing
  • Addition of the at least one polymer filler to the excellent abrasion resistance and wear resistance of the roll cover and in addition also requires in particular the maintenance of the initial surface roughness of the roll cover also over a very long service life of the roll cover.
  • the addition of the at least one polymer filler causes the roll cover does not have too high abrasive effect on doctor bars or other coating devices.
  • the polymer filler is soft enough not to aggressively attack the metering rod but hard enough to increase the abrasion resistance of the matrix.
  • the polymer filler is soft enough not to aggressively attack the metering rod but hard enough to increase the abrasion resistance of the matrix.
  • the particles contained in the roll cover of the at least one inorganic filler having a mean particle diameter (dso) of at most 50 ⁇ so as to improve the mechanical properties of the roll cover, in particular its abrasion resistance, its wear resistance and above all, its resistance to the formation of scratches on its surface, but at the same time to ensure that the roll cover does not appear too abrasive on doctor blades or other coating devices.
  • the average particle diameter d.sub.50 of the at least one inorganic filler means the value of the particle diameter which is less than 50% of the particles present of the at least one inorganic filler, ie 50% of all particles present particles of the at least one inorganic filler have a smaller particle diameter than the dso value.
  • the particles of the at least one inorganic filler have an average particle diameter (dso) between 1 nm and a maximum of 20 ⁇ and particularly preferably of between 1 nm and a maximum of 10 ⁇ .
  • the particle size distribution of the particles of the at least one inorganic filler can be monomodal or else multimodal, for example bimodal. While the particle size distribution has only one maximum in the monomodal distribution, it has several maxima in a multimodal distribution, such as two maxima in a bimodal distribution. A multimodal particle size distribution is especially present when particles of several different fillers are used. When the particle size distribution is monomodal, it is preferable that it be as narrow as possible.
  • the ratio of the particle diameter (dgo) / particle diameter (dso) of the particles of the at least one inorganic filler with a monomodal particle size distribution is preferably 3: 1 to 1: 1, particularly preferably 2: 1 to 1: 1, 01 and very particularly preferably 1 , 5: 1 to 1: 1, 1.
  • mean particle diameter dgo of the particles of the at least one inorganic filler is understood in accordance with the above definition of the mean particle diameter dso according to the present patent application, the value of the particle diameter, the 90% of the present Particles of the at least one inorganic filler below, ie 90% of all present particles of the at least one inorganic filler have a smaller particle diameter than the dgo value.
  • the at least one inorganic filler may consist of any inorganic material which is sufficiently hard to provide a high abrasion resistance and a sufficiently high resistance. ability of the roll cover surface against the formation of scratches on it.
  • suitable materials include, but are not limited to, those selected from the group consisting of metal oxides, semimetal oxides, metal carbides, semi-metal carbides, metal nitrides, metal halides, metal carbonitrides,
  • Particles of two or more different inorganic materials can be used in particular in the roll cover according to the invention, it being preferred in this case that all particles of the inorganic fillers have a mean particle diameter (dso) of at most 50 ⁇ m, particularly preferably between 1 nm and have a maximum of 20 ⁇ and most preferably of between 1 nm and a maximum of 10 ⁇ .
  • dso mean particle diameter
  • the at least one inorganic filler is selected from the group consisting of aluminum oxide, titanium dioxide, zirconium dioxide, yttrium oxide, silicon dioxide, chromium oxide,
  • the optimum amount of inorganic filler or inorganic fillers in the at least one layer of the roll cover according to the invention depends on the properties specifically required for the intended use of the roll cover. With particular regard to use of the roll cover according to the invention in a film coating Aggregate of a paper or board machine, it is preferred that the content of inorganic filler or inorganic fillers is as high as possible.
  • the roll cover preferably contains 0, 1 to 5% by volume, preferably 1 to 5% by volume, particularly preferably 2 to 5% by volume and very particularly preferably 3 to 5% by volume, based on the volume of the at least one layer. % Particles of the at least one inorganic filler, since with smaller amounts the desired effects can not be achieved to a sufficiently high extent and larger amounts can not be sufficiently dispersed in the matrix material.
  • the present invention is not limited to the material for the polymer filler particles to be used in the roll cover. According to a preferred embodiment of the present invention, however, it is preferred that the particles of the at least one polymer filler contained in the roll cover have a greater modulus of elasticity than the matrix, i. the elastomer (s) forming the matrix, so that the at least one polymer filler together with the inorganic filler (s) contribute to an increase in abrasion resistance and, in particular, resistance of the roll cover to scratches on its surface.
  • the material of the polymer filler is preferably soft enough not to abrasive-coat doctor bars or other coating devices, but hard enough to increase the abrasion resistance of the roll cover matrix.
  • the particles of the at least one polymer filler contained in the roll cover have a modulus of elasticity between 500 and
  • the modulus of performance is understood to mean the modulus of elasticity determined in the compression test according to DIN ISO 604.
  • the at least one polymer filler is selected from the group consisting of polyolefins,
  • the at least one polymer filler is a polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE, trade name Teflon®), polyphenylene sulfide (PPS), polyether rethereketone (PEEK), polyamide (PA). , Polycarbonate (PC) or mixtures thereof, and preferably is a high density polyethylene.
  • PP polypropylene
  • PE polyethylene
  • PTFE polytetrafluoroethylene
  • PPS polyphenylene sulfide
  • PEEK polyether rethereketone
  • PA polyamide
  • PC Polycarbonate
  • PC Polycarbonate
  • the at least one polymer filler can be surface-modified and preferably be a high-density polyethylene (HDPE), ultra high molecular weight polyethylene (UHMWPE), high-density polypropylene (HDPP) or a mixture thereof.
  • HDPE high-density polyethylene
  • UHMWPE ultra high molecular weight polyethylene
  • HDPP high-density polypropylene
  • the at least one polymer filler has a hydrolysis resistance such that the modulus of elasticity of the at least one polymer filler after incubation for 4 days at a temperature of 120 ° C and a pressure of 2 bar by not more than 50%.
  • the particle size and the particle size distribution of the polymer filler particles significantly determine the surface roughness of the roll cover. For this reason, it is preferred if the particle size distribution of the particles of the at least one polymer filler is monomodal and is particularly preferably as narrow as possible. Preferably is the ratio of the particle diameter
  • the specific value for the average particle diameter (d 50) of the at least one polymer filler is preferably between 0.1 ⁇ m and 500 ⁇ m and preferably between 10 ⁇ m and 150 ⁇ m.
  • the optimum amount of polymer filler in the at least one layer of the roll cover according to the invention depends on the properties specifically required for the intended use of the roll cover. In particular with regard to use of the roll cover according to the invention in a film coater of a paper, board or tissue machine, it is preferred that the content of polymer filler or polymer fillers is as high as possible.
  • the roll cover preferably contains 0.1 to 20% by volume, preferably 1 to 20% by volume and particularly preferably 5 to 20% by volume of particles of the at least one polymer filler, since with low
  • the desired effects can not be achieved to a sufficiently high extent and larger amounts can not be sufficiently dispersed in the matrix material.
  • elastomer (e) for the roll cover according to the invention it is possible in principle to use those which are used for known roll covers.
  • suitable elastomers include, but are not limited to, polyurethane elastomers and rubber, suitable rubbers being, for example, those selected from the group consisting of nitrile-butadiene rubbers, hydrogenated nitrile-butadiene rubbers, natural rubber, styrene-butadiene rubbers, Chloroprene rubbers and any mixtures of two or more of the aforementioned compounds.
  • the at least one elastomer has such solvent resistance that the modulus of elasticity of the at least one elastomer after incubation for 4 days at 120 ° C in a Saturated steam atmosphere does not decrease by more than 50%.
  • the at least one elastomer has an aging resistance such that its hardness does not increase by more than 50% after incubation for 4 weeks at 120 ° C. in hot air.
  • the at least one matrix-forming elastomer has a modulus of elasticity of less than 500 MPa, preferably between 5 and 100 MPa and particularly preferably between 10 and 50 MPa.
  • the roll cover comprises at least one layer described above, which contains a matrix of at least one elastomer, in which particles of at least one inorganic filler having a mean particle diameter (d.sub.50) of at most 50 .mu.m and particles of at least one polymer filler are embedded. Since this layer particularly advantageously has a high abrasion resistance, an excellent resistance to the formation of scratches thereon and a comparatively low abrasive effect on doctor bars or other coating devices, this at least one layer preferably forms the cover layer of the roll cover. Good results are in particular achieved in this embodiment, when the at least one layer has a thickness between 5 and 25 mm.
  • the roll cover consists of the at least one layer, wherein it is particularly preferred that this has a thickness between 5 and 25 mm.
  • Another object of the present invention is a roll having a roll core and an elastic roll cover formed on the roll core, which is composed as described above.
  • the roll according to the invention can be produced by any process known to the person skilled in the art, preferably by a casting process, particularly preferably by a rotational casting process or vertical casting process.
  • a polyurethane elastomer precursor or a polyurethane elastomer precursor mixture which is composed for example of a polyurethane prepolymer and a curing agent, with particles of one or more inorganic fillers, for example silicon dioxide, having an average particle diameter (dso) of at most 50 ⁇ and with particles of at least a polymer filler, for example high-density polyethylene (HDPE), before the mixture thus produced is applied, for example by means of rotational casting, to an adhesive layer-coated roll core, which consists for example of steel, then the polyurethane elastomer precursor is cured by a heat treatment and so produced roller finally machined to the desired final dimensions.
  • the present invention relates to the use of the roller described above in a film coater of a paper or board machine.
  • Example Adiprene ® Ribbon Flow RFA 1001 Chemtura, USA as polyurethane prepolymer was mixed with a filler-containing hardener mixture, and this mixture was applied by rotational casting to a roller core of steel and by a heat treatment for 4 hours at 100 ° C and then for 24 hours cured at 120 ° C.
  • the mixing ratio of polyurethane prepolymer to filler-containing curing agent mixture was 100:95 and the filler-containing curing agent mixture was composed as follows:

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  • Paper (AREA)

Abstract

L'invention concerne un revêtement de cylindre, en particulier pour un cylindre destiné à traiter une bande de papier, de carton, de tissu ou d'une autre matière fibreuse d'une machine, pour leur fabrication ou leur ennoblissement. Ledit revêtement comprend au moins une couche contenant une matrice constituée d'au moins un élastomère, dans laquelle sont incorporées des particules d'au moins une charge inorganique présentant un diamètre de particule moyen de 50 μm maximum et des particules d'au moins une charge polymère.
PCT/EP2013/050634 2012-01-20 2013-01-15 Revêtement de cylindre contenant une charge minérale et une charge polymère WO2013107721A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102012200791.1 2012-01-20
DE201210200791 DE102012200791A1 (de) 2012-01-20 2012-01-20 Walzenbezug enthaltend mineralischen Füllstoff und Polymerfüllstoff
DE102012205899.0 2012-04-11
DE201210205899 DE102012205899A1 (de) 2012-04-11 2012-04-11 Walze für ein Streichaggregat

Publications (1)

Publication Number Publication Date
WO2013107721A1 true WO2013107721A1 (fr) 2013-07-25

Family

ID=47594711

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/050634 WO2013107721A1 (fr) 2012-01-20 2013-01-15 Revêtement de cylindre contenant une charge minérale et une charge polymère

Country Status (1)

Country Link
WO (1) WO2013107721A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015216503A1 (de) * 2015-08-28 2017-03-02 Voith Patent Gmbh Walzenbezug sowie Auftragswalze umfassend einen solchen
DE102015218672A1 (de) 2015-09-29 2017-03-30 Voith Patent Gmbh Auftragswerk und Verfahren zum Betreiben eines solchen
CN113167027A (zh) * 2018-12-04 2021-07-23 安德里茨库斯特斯有限责任公司 辊子及辊子的制造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040014573A1 (en) * 2002-07-19 2004-01-22 Vergara Romeo G. Paper machine roll cover
DE102007000505A1 (de) * 2007-10-15 2009-04-16 Voith Patent Gmbh Walzenbelag mit füllstoff- und faserverstärktem Polyurethanelastomer
DE102009029045A1 (de) * 2009-08-31 2011-03-03 Voith Patent Gmbh Elastomermatrix mit einpolymerisierten Füllstoffen
WO2011128491A1 (fr) * 2010-04-12 2011-10-20 Metso Paper, Inc. Rouleau pour machine à bande de fibres

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040014573A1 (en) * 2002-07-19 2004-01-22 Vergara Romeo G. Paper machine roll cover
DE102007000505A1 (de) * 2007-10-15 2009-04-16 Voith Patent Gmbh Walzenbelag mit füllstoff- und faserverstärktem Polyurethanelastomer
DE102009029045A1 (de) * 2009-08-31 2011-03-03 Voith Patent Gmbh Elastomermatrix mit einpolymerisierten Füllstoffen
WO2011128491A1 (fr) * 2010-04-12 2011-10-20 Metso Paper, Inc. Rouleau pour machine à bande de fibres

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015216503A1 (de) * 2015-08-28 2017-03-02 Voith Patent Gmbh Walzenbezug sowie Auftragswalze umfassend einen solchen
DE102015218672A1 (de) 2015-09-29 2017-03-30 Voith Patent Gmbh Auftragswerk und Verfahren zum Betreiben eines solchen
DE102015218672B4 (de) * 2015-09-29 2017-06-01 Voith Patent Gmbh Auftragswerk und Verfahren zum Betreiben eines solchen
CN113167027A (zh) * 2018-12-04 2021-07-23 安德里茨库斯特斯有限责任公司 辊子及辊子的制造方法
CN113167027B (zh) * 2018-12-04 2023-08-29 安德里茨库斯特斯有限责任公司 辊子及辊子的制造方法

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