EP1188859B1 - Rouleau élastique - Google Patents

Rouleau élastique Download PDF

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Publication number
EP1188859B1
EP1188859B1 EP01121948A EP01121948A EP1188859B1 EP 1188859 B1 EP1188859 B1 EP 1188859B1 EP 01121948 A EP01121948 A EP 01121948A EP 01121948 A EP01121948 A EP 01121948A EP 1188859 B1 EP1188859 B1 EP 1188859B1
Authority
EP
European Patent Office
Prior art keywords
less
elastic
matrix material
fibers
approx
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
EP01121948A
Other languages
German (de)
English (en)
Other versions
EP1188859A3 (fr
EP1188859A2 (fr
Inventor
Lothar Zimmermann
Carsten Sohl
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 Paper 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
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1188859A2 publication Critical patent/EP1188859A2/fr
Publication of EP1188859A3 publication Critical patent/EP1188859A3/fr
Application granted granted Critical
Publication of EP1188859B1 publication Critical patent/EP1188859B1/fr
Anticipated expiration legal-status Critical
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/49547—Assembling preformed components
    • Y10T29/49549—Work contacting surface element assembled to core
    • Y10T29/49551—Work contacting surface wound about core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core

Definitions

  • the present invention relates to a roller, in particular for smoothing paper webs, according to the preamble of claim 1. Furthermore, the invention is directed to a method for producing such a roller.
  • 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 an existing example of steel or chilled casting very smooth surface and is responsible for the smoothing of their facing side of the paper web, acting on the opposite side of the paper web elastic roller causes a homogenization and densification of the paper web in Preßnip.
  • the order of magnitude of the rolls is in lengths of 3 m to 12 m or diameters of 450 mm to 1500 mm. They withstand line forces up to 600 N / mm and compressive stresses up to 130 N / mm 2 .
  • each of the two sides of the paper web alternately in successive columns once with the hard metal roll and once in contact with the elastic roller. Since the surface of the elastic roller relative to the extremely smooth surface of the hard roller has a relatively high roughness, each of the side of the paper web, which is guided in the current nip on the elastic roller, the previously achieved smoothing result is at least partially nullified.
  • hot spots may occur at which detachment or even bursting of the plastic layer takes place.
  • fillers for example in the form of fibers or powders, are usually introduced into the matrix material.
  • the physical properties of the elastic cover layer are dominated or influenced by the fillers.
  • the heat conductivity of the elastic covering layer can be improved by using fillers having a high thermal conductivity.
  • the smoothness of the surface of the reference layer is usually achieved by appropriately grinding and polishing the reference layer.
  • the size of the fillers commonly used only a limited smoothness of the surface of the cover layer can be achieved.
  • fibers previously used as filler typically have diameters between 8 ⁇ m to 20 ⁇ m. Since, when grinding the surface, these fillers come to lie on the surface and partially emerge from the surface, the smoothness of the surface of known elastic rolls is substantially lower than the smoothness of the known hard rolls.
  • a corresponding method is defined in claim 11.
  • fillers only fibers and powdery fillers (both hereinafter generally referred to as fillers) with dimensions which are many times smaller than the dimensions of conventional fillers are used.
  • fillers both hereinafter generally referred to as fillers
  • the surface of the elastic covering layer containing these extremely small fillers after grinding and polishing is much smoother than the surface of conventional elastic rolls, since the filler sections protruding from the surface have correspondingly small dimensions.
  • the fillers due to the small dimensions of the fillers, a substantially finer distribution of the fillers within the cover layer is possible, as a result of which both a better thermal conductivity and a higher strength of the cover layer are achieved.
  • the improved thermal conductivity means that the high temperatures occurring during operation, in particular at fault locations, are dissipated very quickly, so that the occurrence of hot spots is largely prevented.
  • the higher strength which is achieved by the better homogeneity of the reference layer material, thereby leading to a reduction in the probability of occurrence of hot spots.
  • the improved thermal conductivity is achieved in particular by the fact that due to the reduced dimensions of the fillers, a higher packing density the fillers can be achieved. With this increased packing density, the amount of matrix material present between the fillers, which usually has a low thermal conductivity, is reduced, so that the overall thermal conductivity of the elastic covering layer is improved.
  • the powdery fillers arranged in these free matrix regions formed between the fibers furthermore have the effect that these regions also have an increased thermal conductivity, the extremely high smoothness of the cover layer being maintained by the selected dimensions of the pulverulent fillers.
  • the number of required smoothing gaps can be reduced by the improved surface smoothness, since a high smoothness of the paper web can be achieved on the elastic roller associated side of the paper web and not, as in the known rollers, by the elastic roller previously by the Hard roller achieved smoothing result is worsened again.
  • the diameter of the fibers is less than about 500 nm, in particular less than about 200 nm.
  • the fibers are formed as carbon, aramid or glass fibers. A mixture of these fibers is possible.
  • the powdery Fillers are preferably made of the same material as the fibers, but can in principle also consist of other materials with high thermal conductivity.
  • the fibers can advantageously be connected to one another, for example twisted or entangled, and advantageously in the form of fiber rovings or a fiber fleece. By the connection of, for example, about 10 mm or less long fibers in conjunction with the increased packing density improved thermal conductivity over conventional reference layers is achieved.
  • the diameter of the fiber is predominantly decisive if the largest proportion of the fibers protrudes from the surface of the cover layer during abrading with one of their ends.
  • the smaller the diameter of the fibers the higher the surface smoothness of the reference layer after grinding and polishing.
  • the surface thickness is also improved over conventional cover layers due to the reduced thickness, even if the length of the fibers is chosen as usual.
  • the use of carbon fibers is advantageous in that they have a good thermal conductivity. In this way, a rapid heat dissipation through the carbon fibers during heating of the roller is ensured during operation.
  • the fillers may preferably be distributed uniformly in the matrix material, wherein due to the small size of the fillers, a very homogeneous mixture and, associated therewith, a very high strength of the cover layer is achieved with a simultaneously very good thermal conductivity.
  • the improved thermal conductivity is achieved in particular in that the material of the fillers is chosen so that it has a higher thermal conductivity than the matrix material.
  • the surface of the elastic cover layer has an Ra value of less than about 0.5 ⁇ m, in particular less than about 0.2 ⁇ m, preferably less than about 0.1 ⁇ m.
  • the elastic roller has a surface smoothness, which is of the order of the surface smoothness of the hard roller, so that when passing through a Glättspalts both sides of the paper web are smoothed with substantially the same quality.
  • the desired result can thus be dispensed with some or almost all of the smoothing column of a multi-roll calender, so that in the optimal case with a single nip a sufficient smoothing result is achieved.
  • the production of the elastic roller can be carried out in a known manner, for example by injection, casting or winding method on the roll core, wherein according to the invention extremely small powdery fillers and extremely thin fibers introduced into the elastic matrix material or coated in a winding process with this.
  • the fibers may preferably be in the form of fiber rovings, so that extremely thin layers of fiber rovings can be wound onto the roll core in accordance with the extremely thin diameter of the fibers. These are preferably before or during the winding with the matrix material impregnated or acted upon by winding on the roll core with the matrix material.
  • a fiber fleece which ensures a good thermal conductivity and can be impregnated in the same way with the matrix material.
  • Fig. 1 shows a part of a longitudinally cut, consisting for example of steel or chilled roller core 10, which is provided on its outside with an elastic cover layer 12 also shown cut.
  • the cover layer 12 consists of an elastic matrix material 16 into which particulate fillers 17, for example in powder form, are introduced.
  • the particulate fillers 17 have a diameter of less than 1 .mu.m, wherein the diameter is preferably less than 800 nm, in particular less than 500 nm and advantageously even less than 200 nm.
  • extremely thin fibers 19 are embedded in the matrix material, as shown in FIG. For reasons of clarity, the fibers 19 are not shown in FIG. 1.
  • the fillers 17 may, as shown schematically in the left half of FIG. 1, be substantially evenly distributed over the cover layer 12 or, as shown in the right half of FIG. 1 separated by a dashed line 18, distributed within the cover layer 12 be that the concentration of the fillers 17 decreases radially outward.
  • the physical properties, for example, thermal expansion coefficient, thermal conductivity, elasticity, etc., of the reference layer 12 in the radially inner region are more dominated by the fillers than in the radially outer region.
  • the coefficient of thermal expansion in the radially inner region of the cover layer 12 can thus be adapted to the coefficient of thermal expansion of the roll core 10, so that longitudinal stresses occurring during operation can be compensated for by non-uniform expansion of the roll core 10 and cover layer 12.
  • the thermal conductivity in the radially inner region of the cover layer 12 can be increased by the embedded fillers 17, so that in particular in the region between the roller core 10 and the reference layer 12 occurring excess heat can be dissipated quickly sideways.
  • FIG. 2 shows the fibers 19 arranged in the matrix material 16, which fibers are in particular formed as carbon fibers. While in the left half of FIG. 2 the fibers 19 are again distributed uniformly within the cover layer 12, in the right half separated by the dashed line 18 a distribution of the fibers 19 is shown which is similar to the distribution of the powdered particles 17 in FIG decreases radially outwards. As a result, the advantages already described with reference to FIG. 1 are achieved. Between the fibers 19, the powdery fillers 17 are indicated schematically.
  • the formation of the fillers as fibers 19 has the advantage that, depending on the length of the fibers 19, the heat arising in the interior of the cover layer 12 can be rapidly dissipated without interruption by the elastic matrix material 16. In addition, a higher stiffness of the cover layer 12 can be achieved by the fibers 19.
  • the fibers 19 have a diameter of less than 800 nm, in particular less than 500 nm or even less than 200 nm. This extremely thin formation of the fibers, as already described for Figure 1, an extremely smooth surface 20 of the reference layer 12 after grinding and polishing achieved. Since the fibers 19 generally extend with one of their ends towards the surface 20 of the cover layer 12 or protrude minimally out of it, as can be seen in FIG. 2 by way of example at the fibers marked 19 ', the smoothness of the surface becomes 20 determined by the diameter of the fibers 19 '. The extremely small diameter of the fibers 19 of less than 1 ⁇ m thus achieves an extremely smooth surface of the cover layer 12 after grinding and polishing, which lies in the region of the smoothness of the surface of a hard roller.
  • Fig. 3 shows the production of a roll formed according to the invention by winding.
  • a roll according to the invention can also be produced by other production processes, for example spraying, casting or other suitable processes.
  • the individual fibers are coated with a liquid matrix material 16 so that the fibers are substantially completely embedded in the matrix material 16.
  • the matrix material 16 may be a plastic, in particular a resin / hardener combination. Additional fillers, for example in the form of the powdery fillers 17, whose dimensions are consistently smaller than 1 ⁇ m, may also be provided in the matrix material 16.
  • the fiber bundle 7 completely surrounded by the coating apparatus 8 with the matrix material 16 is wound on the roll core 10 abutting or overlapping, so that after a winding passage over the entire length of the roll core 10, this is completely covered with a fiber layer 7 coated with matrix material 16.
  • This winding process can be repeated several times until a cover layer 12 having a sufficient thickness of 3 to 20 mm is produced. Subsequently, the cover layer 12 can be ground and polished to achieve an extremely smooth surface, whereby an extremely smooth surface of the cover layer 12 is obtained by the extremely small dimensions of the fibers or additional fillers.
  • the right half of Fig. 4 shows a cross section through fibers 19 according to the invention with reduced diameter Fibers 19 are present in the cover layer according to the invention between the fibers 19 less matrix material 16 than between the fibers 19 ".
  • the also extremely small powdery fillers 17 are present, which cause good heat conduction between the individual fibers. Since the thermal conductivity of the matrix material 16 is usually significantly worse than the thermal conductivity of the fiber material, the inventive reference layer 12 thus has an improved overall thermal conductivity.

Landscapes

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

Claims (13)

  1. Rouleau de lissage, notamment pour lisser des bandes de matériau, comprenant un mandrin de rouleau dur (10) constitué notamment de métal, qui est pourvu sur son côté extérieur d'une couche de revêtement élastique (12), qui se compose d'un matériau élastique formant matrice (16) et de fibres (19) noyées dans le matériau formant matrice, l'épaisseur de la couche de revêtement élastique (12) étant comprise entre 3 et 20 mm et des matières de charge pulvérulentes (17) étant noyées en plus des fibres (19) dans le matériau formant matrice (16), leurs dimensions extérieures dans au moins une direction étant à chaque fois inférieures à 1 µm,
    caractérisé en ce que
    le diamètre des fibres (19) est inférieur à 800 nm, de sorte que la surface (20) de la couche de revêtement (12) possède un lissé extrêmement élevé, c'est-à-dire une valeur de rugosité Ra inférieure à environ 0,6 µm.
  2. Rouleau selon la revendication 1,
    caractérisé en ce que
    le diamètre des fibres (19) est inférieur à environ 500 nm, de préférence inférieur à environ 200 nm.
  3. Rouleau selon la revendication 1 ou 2,
    caractérisé en ce que
    les dimensions extérieures des matières de charge pulvérulentes (17) dans au moins une direction sont inférieures à environ 800 nm, en particulier inférieures à environ 500 nm, et de préférence inférieures à environ 200 nm.
  4. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les dimensions extérieures des matières de charge pulvérulentes (17) dans toutes les directions sont inférieures à 1 µm, de préférence inférieures à environ 800 nm, notamment inférieures à environ 500 nm, de préférence inférieures à environ 200 nm.
  5. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les matières de charge pulvérulentes (17) sont réalisées sous la forme de particules essentiellement rondes ou sphériques.
  6. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les fibres (19) sont réalisées sous la forme de fibres de carbone.
  7. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce qu'
    au moins une partie des matières de charge pulvérulentes (17) se compose de carbone.
  8. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les fibres (19) et/ou les matières de charge pulvérulentes (17) se composent d'un matériau qui possède une conductibilité thermique plus importante que le matériau formant matrice.
  9. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    les fibres (19) et/ou les matières de charge pulvérulentes (17) sont réparties uniformément dans le matériau formant matrice (16).
  10. Rouleau selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la surface (20) de la couche de revêtement élastique (12) possède une valeur de rugosité Ra inférieure à environ 0,5 µm, notamment inférieure à environ 0,2 µm, et de préférence inférieure à environ 0,1 µm.
  11. Procédé de fabrication d'un rouleau élastique comprenant un mandrin de rouleau dur (10) constitué notamment de métal et une couche de revêtement élastique (12) qui se compose d'un matériau élastique formant matrice (16), notamment pour la fabrication d'un rouleau selon l'une quelconque des revendications précédentes, dans lequel,
    pour produire un lissé extrêmement élevé de la couche de revêtement élastique, c'est-à-dire une valeur de rugosité Ra inférieure à environ 0,6 µm, on introduit dans le matériau élastique formant matrice (16) essentiellement exclusivement des fibres (19), dont le diamètre est inférieur à 800 nm, des matières de charge pulvérulentes (17) étant introduites en plus des fibres (19) dans le matériau formant matrice (16), leurs dimensions extérieures dans au moins une direction étant à chaque fois inférieures à 1 µm, et la couche de revêtement élastique (12) étant formée avec une épaisseur comprise entre 3 et 20 mm.
  12. Procédé selon la revendication 11,
    caractérisé en ce que
    les fibres (19) et/ou les matières de charge pulvérulentes (17) sont appliquées sur le mandrin du rouleau (10) notamment conjointement avec le matériau formant matrice (16) par un procédé d'injection, de coulage ou d'enroulement.
  13. Procédé selon la revendication 11 ou 12,
    caractérisé en ce que
    les fibres (19) et/ou les matières de charge pulvérulentes (17) sont appliquées sur le mandrin du rouleau (10) conjointement avec le matériau formant matrice (16).
EP01121948A 2000-09-18 2001-09-12 Rouleau élastique Expired - Lifetime EP1188859B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10046055A DE10046055A1 (de) 2000-09-18 2000-09-18 Elastische Walze
DE10046055 2000-09-18

Publications (3)

Publication Number Publication Date
EP1188859A2 EP1188859A2 (fr) 2002-03-20
EP1188859A3 EP1188859A3 (fr) 2003-06-04
EP1188859B1 true EP1188859B1 (fr) 2006-07-05

Family

ID=7656589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01121948A Expired - Lifetime EP1188859B1 (fr) 2000-09-18 2001-09-12 Rouleau élastique

Country Status (4)

Country Link
US (1) US6682467B2 (fr)
EP (1) EP1188859B1 (fr)
AT (1) ATE332410T1 (fr)
DE (2) DE10046055A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI116082B (fi) * 2001-02-27 2005-09-15 Metso Paper Inc Menetelmä telan tai hihnan polymeeripinnoitteen ominaisuuksien säätämiseksi
DE102004025116A1 (de) 2004-05-21 2005-12-08 Voith Paper Patent Gmbh Faserverbund Walzenbezug
DE102004044389A1 (de) * 2004-09-14 2006-03-30 Voith Paper Patent Gmbh Kalanderanordnung
DE102009018038B4 (de) 2009-04-18 2011-04-14 Groß, Heinz, Dr.-Ing. Metallische Walze mit elastischer Oberfläche
DE102009028210A1 (de) * 2009-08-04 2011-02-17 Voith Patent Gmbh Selbstkonditionierende Walzenbeschabung
DE102009029695A1 (de) * 2009-09-23 2011-03-31 Voith Patent Gmbh Walzenbezug
DE102012205221A1 (de) * 2012-03-30 2013-10-02 Voith Patent Gmbh Walzenbezug

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JPS5724216A (en) * 1980-07-21 1982-02-08 Fuji Photo Film Co Ltd Supercalender
US4321033A (en) * 1980-10-29 1982-03-23 Xerox Corporation Thermally conductive fusing device
FI72765C (fi) * 1986-02-13 1987-07-10 Valmet Oy Utbredningsvals eller motsvarande foer vaevnaden i en pappersmaskin samt foerfarande foer framstaellning av denna.
DE69220313T2 (de) * 1991-09-27 1998-01-08 Bridgestone Corp Kontaktaufladegerät und Verfahren
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Also Published As

Publication number Publication date
ATE332410T1 (de) 2006-07-15
DE10046055A1 (de) 2002-03-28
DE50110388D1 (de) 2006-08-17
EP1188859A3 (fr) 2003-06-04
US20020045523A1 (en) 2002-04-18
US6682467B2 (en) 2004-01-27
EP1188859A2 (fr) 2002-03-20

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