EP1363034B1 - Rouleau de lissage élastique et son procédé de fabrication - Google Patents

Rouleau de lissage élastique et son procédé de fabrication Download PDF

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Publication number
EP1363034B1
EP1363034B1 EP20030009548 EP03009548A EP1363034B1 EP 1363034 B1 EP1363034 B1 EP 1363034B1 EP 20030009548 EP20030009548 EP 20030009548 EP 03009548 A EP03009548 A EP 03009548A EP 1363034 B1 EP1363034 B1 EP 1363034B1
Authority
EP
European Patent Office
Prior art keywords
roll
accordance
layer
plastic
outer layer
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.)
Expired - Lifetime
Application number
EP20030009548
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German (de)
English (en)
Other versions
EP1363034A1 (fr
Inventor
José Rodal
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
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1363034A1 publication Critical patent/EP1363034A1/fr
Application granted granted Critical
Publication of EP1363034B1 publication Critical patent/EP1363034B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 present invention relates to an elastic smoothing roll, in particular for the smoothing of paper webs, with a hard roll core and provided on the outside of the roll core, multi-layered, elastic matrix material comprising elastic cover layer. Furthermore, the invention is directed to a method for producing such an elastic smoothing roll.
  • Elastic rolls of this type are used, for example, in the calendering of paper webs.
  • an elastic roller together with a hard roller forms a press nip through which the paper web to be processed is passed.
  • the hard roller has a very smooth surface consisting, for example, of steel or chilled cast iron and is responsible for the smoothing of the side of the paper web facing it
  • the elastic roller acting on the opposite side of the paper web causes equalization and densification of the paper web in press nip.
  • the order of magnitude of the rolls lies with lengths of 3 to 12 meters or diameters of 450 to 1500 millimeters. They withstand line forces of up to 600 N / mm and compressive stresses up to 130 N / mm 2 .
  • the plastics conventionally used for the coating have a significantly higher coefficient of thermal expansion than the steel rollers or chilled cast iron commonly used, so that a high temperature increase causes high temperatures Tensions between the steel roller or chill roller and the associated plastic coating occur.
  • the elastic cover layer To control the properties of the elastic cover layer, it is known to introduce powdered fillers and / or fibers into the matrix material. Depending on the amount and physical property of these fillers or fibers, the physical properties of the elastic cover layer are dominated or influenced by the fillers or the fibers. However, the powdery or fibrous fillers often worsen the smoothness of the surface of the elastic roll. This is undesirable because the paper quality depends directly on the smoothness of the surface of the smoothing roll.
  • reference layers of plastic material have a relatively low abrasion resistance, so that the life of the corresponding smoothing rollers is often insufficient. Due to the plastics used for the cover layer, there is also the risk that in operation by the existing friction between the plastic roller and the paper web to be smoothed the elastic smoothing roller is statically charged, creating the risk that attracted by this charge particles, such as dust particles or the like, settle on the surface of the smoothing roller and thus cause a reduction in the smoothing quality or at worst even damage to the roll coating.
  • a smoothing roll in which in addition to the outer plastic layer, a plastic layer covering this metallic cover layer is provided.
  • the metallic outer layer is produced by winding liquid-metal-coated fibers onto the elastic plastic layer. Due to the fibers used as a carrier for the metal coating, the smoothness of this roller depends on the fiber diameters used.
  • the elastic cover layer is not made of plastic, but exclusively of a soft metal.
  • Such trained rollers have a very smooth surface and a very high thermal conductivity.
  • these rolls are not suitable for all types of paper due to the pure metal surface, since the elasticity of these rolls is less than the elasticity of smoothing rolls with a plastic coating.
  • the part of the object relating to the smoothing roller is achieved on the basis of a smoothing roller of the type mentioned at the outset, wherein the thermal reference layer comprises a radially inner, fiber-reinforced base layer, wherein the coefficient of thermal expansion and modulus of elasticity of the base layer through the fibers is equal to the coefficient of thermal expansion and Are approximated elastic modulus of the roll core, that a middle elastic layer is provided whose elastic modulus is smaller than the elastic modulus of the base layer, that a radially outer outer layer is provided, which consists of a mixture of molten metal and molten plastic, and that the coefficient of thermal expansion and the Young's modulus of the middle layer are at least in the radially outer region of the temperature expansion coefficient and the elastic modulus of the outer layer approximated.
  • the thermal reference layer comprises a radially inner, fiber-reinforced base layer, wherein the coefficient of thermal expansion and modulus of elasticity of the base layer through the fibers is equal to the coefficient of thermal expansion and Are approximated elastic modul
  • the inventive method is characterized in that the existing of a mixture of molten metal and molten plastic outer layer is applied by a spraying, casting, coating or painting on the middle layer.
  • the advantages of the different known methods are thus combined with one another by producing the outer layer from a mixture of metal and plastic and by longitudinal stresses occurring between the individual layers of the reference layer during operation as a result of a corresponding configuration of the remaining layers reduced or avoided in the optimal case completely.
  • both the metal and the plastic are mixed with each other in the molten state and applied to the surface of the roll core, thereby achieving significant advantages.
  • a mixture according to the invention of molten metal and molten plastic has a substantially more homogeneous structure and thus an increased strength. Furthermore, it is avoided that crystallization points for hotspots caused by particles arranged in the matrix material, which could lead to destruction of the roll reference layer.
  • the physical properties of the cover layer are optimally homogeneous over the entire cover layer.
  • the smoothness of the cover layer can be extremely high, for example, by grinding and subsequent polishing, set as no particles, be it in Powder form, in fibrous form or in any other form, are present in the matrix material, which could ultimately lead to the surface of the cover layer to an undesirable roughness.
  • the roll produced according to the invention has a heat conduction coefficient which is significantly improved in comparison to a roll with a plastic layer, so that the heat occurring during operation can be dissipated very quickly and thus the danger of the occurrence of hotspots can be further reduced.
  • the outer layer is formed substantially free of fibers.
  • optimum homogeneity of the outer layer and on the other hand an extremely smooth surface of the outer layer is achieved.
  • the smoothness can be optimized by grinding and / or polishing the surface.
  • the surface of the outer layer preferably has an Ra value which is less than 0.05 ⁇ m, in particular less than 0.03 ⁇ m.
  • an abrasion-resistant metal is used for the outer layer.
  • the more abrasion resistant the metal used the greater the life of a corresponding trained roller, so that the economy of such a roller can be significantly improved.
  • a high performance plastic i. a high melting point plastic, especially a polyimide (PI), polyamideimide (PAI), polyetherimide (PEI), polysulfone (PSU, PES), polyethersulfone (PESU) or a poly (phenylene sulfone) (PPSU), a mixture of one or more high performance plastics with other plastics or a mixture of high performance plastics.
  • PI polyimide
  • PAI polyamideimide
  • PEI polyetherimide
  • PSU polysulfone
  • PES polysulfone
  • PESU poly (phenylene sulfone)
  • PPSU poly (phenylene sulfone)
  • a plastic or a plastic mixture having a melting point of more than about 300 ° C, in particular more than about 400 ° C, preferably from about 500 ° C or more and / or with a modulus of elasticity of less than about 4 GPa, preferably of about 3.5 GPa or less is used.
  • the middle layer is substantially thicker than the outer layer and / or formed as the base layer.
  • a "soft" course of the essential physical properties such as thermal expansion coefficient and elastic modulus over the radial thickness of the reference layer is adjustable. This prevents a separation of individual layers from one another due to stresses or temperature differences occurring during operation.
  • the outer layer has a high thermal conductivity. This ensures that that occurring during operation heat can be derived quickly and reliably from the respective overheating point.
  • the middle layer at least partially contains fibers.
  • fibers are preferably fibers with a relatively high thermal conductivity
  • the number within the middle layer can be radially variable so that the thermal conductivity of the middle layer increases radially outward until it is approximately equal to the heat conductivity of the outer layer at the transition to the outer layer.
  • the modulus of elasticity can be increased radially outwards and / or the coefficient of thermal expansion can be set to decrease radially outwards in order to achieve an alignment with the outer layer. This can be achieved, for example, by using carbon fibers in the middle layer.
  • the fibers of the base layer at least partially comprise aramid and / or glass fibers.
  • the fibers are wound as rovings on the roll core and embedded in the elastic matrix material of the base layer.
  • the material and the amount of fibers are chosen so that the temperature coefficient and the elasticity model in the radially inner region of the base layer are approximated to the corresponding parameters of the roll core. Radially outward, the amount of fibers is chosen to give a smooth transition of these parameters to the middle layer.
  • the matrix material may preferably be formed as a resin-hardener combination and comprise, for example, epoxy resin.
  • the roll core can be made of metal or fiber-reinforced plastic in particular.
  • the use of a plastic roller as a roll core has the advantage that the weight and thus the inertia of the smoothing roll can be significantly reduced compared to a use of a metal core. Particularly in the case of the high rotational speeds occurring during operation, the reduction of the roll weight is advantageous.
  • the use of especially fiber-reinforced plastic rollers, especially in so-called Breitnipkalandern advantageous since a roll core made of plastic over a metallic roll core has a certain flexibility, which causes a homogenization of the paper web in the nip.
  • the outer layer is applied to the roll core by a flame or plasma spraying process.
  • a flame or plasma spraying process By means of a corresponding flame or plasma spraying process, it is possible to produce very high-quality outer layers and to produce a very strong bond between these outer layers and the middle layer.
  • the metal and / or the plastic are preferably melted during the flame or plasma spraying.
  • the metal and / or the plastic may be present as starting material in each case, for example, in powder form and be converted into liquid state only during the flame or plasma spraying. In principle, however, it is also possible that the metal and the plastic are melted before being applied to the roll core and mixed together.
  • the outer layer can be easily repaired, for example, simply by spraying a mixture of molten metal and molten plastic according to the invention - optionally over the entire surface of the roll or only in the region of damage.
  • the figure shows a schematic cross section through an inventively designed smoothing roll.
  • the illustrated smoothing roll comprises a roll core 1, which is made, for example, of metal or fiber-reinforced plastic, for example polymer, and which is rotatably mounted about an axis of rotation 2.
  • a roll core 1 which is made, for example, of metal or fiber-reinforced plastic, for example polymer, and which is rotatably mounted about an axis of rotation 2.
  • carbon fibers, aramid fibers, glass fibers or other suitable fibers can be used as fibers.
  • a relatively thin base layer 3 which consists of a fiber-reinforced elastic matrix material consists.
  • the material, the number and the orientation of the fibers are selected so that the coefficient of thermal expansion of the base layer 3 is at least approximately as large as the temperature expansion coefficient of the roll core 1, at least in its radially inner region.
  • the base layer 3 is followed by a middle layer 4, which is formed substantially thicker than the base layer 3.
  • This middle layer 4, as a continuation of the base layer 3, may also consist of fiber-reinforced matrix material. Since the thickness of the middle layer 4 substantially determines the elasticity of the entire reference layer, the number of fibers within the middle layer 4 is usually significantly reduced from the base layer 3, so that the elastic modulus of the middle layer 4 is less than the elastic modulus of the base layer 3.
  • the middle layer 4 is in turn divided into a radially inner region 5 and a radially outer region 6, which are separated from each other in the figure by a dashed line 7. While the ultimately existing elasticity of the overall roller is essentially determined by the matrix material used and the fibers embedded therein in the radially inner region 5, the radially outer region 6 forms a transition region to an outer layer 9 forming the surface 8 of the roller.
  • the region 6 of the middle layer 4 is significantly thinner than the region 5 and contains fibers embedded in the matrix material, by means of which the elastic modulus and the coefficient of thermal expansion approach the corresponding parameters of the outer layer 9.
  • the fibers can be variable radially outward, in particular be increasingly distributed in order to achieve the closest possible approximation of said parameters.
  • the outer layer 9 is formed as a thin elastic layer, which according to the invention consists of a mixture of molten metal and molten plastic.
  • the outer layer 9 is therefore consistently homogeneous and has an extremely smooth surface 8, for example, due to an accomplished grinding and / or polishing process.
  • the mixture of molten metal and molten plastic can be applied, for example, as indicated schematically, by a flame spraying device 10 on the surface of the middle layer 4.
  • a flame spraying device 10 on the surface of the middle layer 4.
  • the coating can be applied by the roller core 1 is set in rotation and the flame spraying device 10 is moved slowly in the axial direction parallel to the axis of rotation 2.
  • the starting materials metal / plastic
  • the two starting materials already by a Pretreatment in the liquid state and be applied by a simple spray, casting or painting on the surface of the roll core.

Landscapes

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

Claims (22)

  1. Cylindre de lissage élastique, en particulier pour lisser des bandes de papier, comportant un noyau de cylindre dur (1) et une couche de revêtement élastique prévue sur la face extérieure du noyau de cylindre (1), réalisée multicouche et contenant un matériau de matrice élastique,
    caractérisé en ce que
    la couche de revêtement élastique comprend une couche de base (3) renforcée de fibres et située radialement à l'intérieur, le coefficient de dilatation thermique et le module d'élasticité de la couche de base (3) étant du fait des fibres rapprochés du coefficient de dilatation thermique et du module d'élasticité du noyau de cylindre (1),
    en ce qu'il est prévu une couche centrale élastique (4) dont le module d'élasticité est inférieur au module d'élasticité de la couche de base (3),
    en ce qu'il est prévu une couche extérieure (9) située radialement à l'extérieur, qui est constituée d'un mélange de métal fondu et de matière plastique fondue,
    et en ce que le coefficient de dilatation thermique et le module d'élasticité de la couche centrale (4) sont rapprochés du coefficient de dilatation thermique et du module d'élasticité de la couche extérieure (9), au moins dans sa zone (6) située radialement à l'extérieur.
  2. Cylindre selon la revendication 1,
    caractérisé en ce que la couche extérieure (9) est réalisée sensiblement sans fibres.
  3. Cylindre selon la revendication 1 ou 2,
    caractérisé en ce que
    la surface (8) de la couche extérieure (9) est extrêmement lisse, en particulier polie.
  4. Cylindre selon la revendication 3,
    caractérisé en ce que
    la surface (8) de la couche extérieure (9) possède une valeur Ra inférieure à 0,05 µm, en particulier inférieure à 0,03 µm.
  5. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    le métal utilisé pour le mélange de la couche extérieure (9) est un métal résistant à l'abrasion.
  6. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la matière plastique utilisée pour le mélange de la couche extérieure (9) est une matière plastique à haute performance, c'est-à-dire une matière plastique à point de fusion élevé, en particulier un polyimide (PI), polyamideimide (PAI), polyétherimide (PEI), polysulfone (PSU, PES), polyéthersulfone (PESU) ou un polyphénsulfone (PPSU).
  7. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la matière plastique utilisée pour le mélange de la couche extérieure (9) est un mélange d'une ou de plusieurs matières plastiques à haute performance avec d'autres matières plastiques ou bien un mélange de matières plastiques à haute performance.
  8. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la matière plastique ou le mélange de matière plastique utilisé(e) pour le mélange de la couche extérieure (9) présente un point de fusion supérieur à environ 300°C, en particulier supérieur à environ 400°C, de préférence égal à environ 500°C ou plus.
  9. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la matière plastique utilisée pour le mélange de la couche extérieure (9) possède un module d'élasticité inférieur à environ 4 GPa, de préférence d'environ 3,5 GPa ou moins.
  10. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche centrale (4) est sensiblement plus épaisse que la couche extérieure (9).
  11. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche centrale (4) est sensiblement plus épaisse que la couche de base (3).
  12. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche extérieure (9) est réalisée antistatique.
  13. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche extérieure (9) possède une haute conductivité thermique.
  14. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche centrale (4) comprend au moins localement des fibres.
  15. Cylindre selon la revendication 14,
    caractérisé en ce que
    les fibres de la couche centrale (4) comprennent au moins des fibres de carbone.
  16. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    les fibres de la couche de base (3) comprennent au moins partiellement des fibres aramides et/ou des fibres de verre.
  17. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    le matériau de matrice comprend de la résine époxy.
  18. Cylindre selon l'une des revendications précédentes,
    caractérisé en ce que
    le noyau de cylindre (1) est constitué de métal ou de matière plastique en particulier renforcée de fibres.
  19. Procédé pour réaliser un cylindre de lissage élastique selon l'une des revendications précédentes,
    caractérisé en ce que
    la couche extérieure (9) constituée d'un mélange de métal fondu et de matière plastique fondue est déposée sur la couche centrale (4) par un procédé de projection, de coulée, de couchage ou de laquage.
  20. Procédé selon la revendication 19,
    caractérisé en ce que
    le mélange est déposé sur la couche centrale (4) par un procédé de projection à la flamme ou au plasma.
  21. Procédé selon la revendication 20,
    caractérisé en ce que
    le métal et/ou la matière plastique est fondu(e) pendant la projection à la flamme ou au plasma.
  22. Procédé selon l'une des revendications 19 à 21,
    caractérisé en ce que
    le métal et la matière plastique sont fondus et mélangés l'un avec l'autre avant la déposition sur la couche centrale (4).
EP20030009548 2002-05-13 2003-04-28 Rouleau de lissage élastique et son procédé de fabrication Expired - Lifetime EP1363034B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10221172 2002-05-13
DE2002121172 DE10221172A1 (de) 2002-05-13 2002-05-13 Elastische Glättwalze und Verfahren zur Herstellung einer solchen

Publications (2)

Publication Number Publication Date
EP1363034A1 EP1363034A1 (fr) 2003-11-19
EP1363034B1 true EP1363034B1 (fr) 2007-06-06

Family

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Application Number Title Priority Date Filing Date
EP20030009548 Expired - Lifetime EP1363034B1 (fr) 2002-05-13 2003-04-28 Rouleau de lissage élastique et son procédé de fabrication

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EP (1) EP1363034B1 (fr)
DE (2) DE10221172A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008044369A1 (de) * 2008-12-05 2010-06-10 Voith Patent Gmbh Kalander
DE102009018038B4 (de) 2009-04-18 2011-04-14 Groß, Heinz, Dr.-Ing. Metallische Walze mit elastischer Oberfläche
DE102009029695A1 (de) * 2009-09-23 2011-03-31 Voith Patent Gmbh Walzenbezug
DE102009045824A1 (de) * 2009-10-20 2011-04-21 Voith Patent Gmbh Kalander
FI20106122A (fi) * 2010-10-28 2012-04-29 Metso Paper Inc Menetelmä värähtelyn sietokyvyn parantamiseksi kuiturainakoneen pyörivässä puristuselimessä, pinnoite, puristuselin ja menetelmä pinnoitteen tai puristuselimen kunnostamiseksi

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116641A1 (de) * 1991-05-22 1992-11-26 Sigri Great Lakes Carbon Gmbh Verfahren zum beschichten eines faserverstaerkten kunststoffkoerpers
DE19710573C2 (de) * 1997-03-14 1999-01-21 Voith Sulzer Finishing Gmbh Kalander, insbesondere für Papierbahnen
JPH10336668A (ja) * 1997-06-02 1998-12-18 Sharp Corp 動きベクトル検出装置
DE19813640A1 (de) * 1998-03-27 1999-09-30 Voith Sulzer Papiertech Patent Kalander, insbesondere zur Behandlung einer Papierbahn
DE19925421A1 (de) * 1999-06-02 2000-12-07 Voith Sulzer Papiertech Patent Elastische Walze und Verfahren zum Herstellen einer solchen
DE19925418A1 (de) * 1999-06-02 2000-12-07 Voith Sulzer Papiertech Patent Elastische Walze und Verfahren zum Herstellen einer solchen
DE19925419A1 (de) * 1999-06-02 2000-12-07 Voith Sulzer Papiertech Patent Elastische Walze und Verfahren zum Herstellen einer solchen
DE19925420A1 (de) * 1999-06-02 2000-12-07 Voith Sulzer Papiertech Patent Elastische Walze und Verfahren zum Herstellen einer solchen
DE19951038A1 (de) * 1999-10-22 2001-04-26 Voith Paper Patent Gmbh Elastische Walze
DE19952320A1 (de) * 1999-10-29 2001-05-03 Voith Paper Patent Gmbh Elastische Walze sowie Verfahren zur Herstellung einer solchen Walze

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Publication number Publication date
EP1363034A1 (fr) 2003-11-19
DE10221172A1 (de) 2003-12-04
DE50307404D1 (de) 2007-07-19

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