EP1048782B1 - Rouleau élastique et procédé pour la fabrication d' un tel rouleau - Google Patents

Rouleau élastique et procédé pour la fabrication d' un tel rouleau Download PDF

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Publication number
EP1048782B1
EP1048782B1 EP00105584A EP00105584A EP1048782B1 EP 1048782 B1 EP1048782 B1 EP 1048782B1 EP 00105584 A EP00105584 A EP 00105584A EP 00105584 A EP00105584 A EP 00105584A EP 1048782 B1 EP1048782 B1 EP 1048782B1
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EP
European Patent Office
Prior art keywords
particles
matrix material
roll
accordance
fibre
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
EP00105584A
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German (de)
English (en)
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EP1048782A1 (fr
Inventor
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
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Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1048782A1 publication Critical patent/EP1048782A1/fr
Application granted granted Critical
Publication of EP1048782B1 publication Critical patent/EP1048782B1/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 a roller, in particular for smoothing of paper webs, with a hard one consisting in particular of metal Roll core with an elastic cover layer on the outside is provided, which is made of an elastic matrix material and in the There is matrix material embedded fillers. Furthermore, the invention directed to a method of making such a roller.
  • Elastic rollers of this type are used, for example, when satinizing paper webs.
  • An elastic roller forms a press nip with a hard roller through which the paper web to be processed is passed. While the hard roller has a very smooth surface, for example made of steel or chilled cast iron, and is responsible for smoothing the side of the paper web facing it, the elastic roller acting on the opposite side of the paper web causes the paper web to be leveled and compressed in the press nip.
  • the size of the rollers is 3 to 12 m in length and 450 to 1500 mm in diameter. They withstand line forces up to 600 N / mm and compressive stresses up to 130 N / mm 2 .
  • plastic coverings maximum temperature differences of about 20 ° C over the Width of the roller permitted and on the other hand have that for the coating
  • plastics used are much higher Thermal expansion coefficients than those commonly used Steel rollers or chill cast rollers, so that by an increase in temperature high axial tensions between the steel roller or chilled iron roller and the associated plastic coating occur.
  • EP-A-0146342 discloses a roller with a two-layer reference layer known. To improve heat dissipation is the inside Reference layer thermally conductive formed by in the matrix material thermally conductive fillers are introduced into the reference layer. From the US-PS-5142759 is also a roller with an elastic reference layer known. For draining off the surface of the reference layer occurring electrostatic charges are electrical in the reference layer conductive fillers embedded.
  • the reference layer consists of several Layers of an elastic matrix material, each with an unreinforced Alternate layer with a layer reinforced with fiber layers.
  • the part of the task relating to the roller is based on the invention by a roller of the type mentioned by the features of Claim 1 solved.
  • the method according to the invention is characterized by the features of claim 11.
  • both the thermal conductivity and the rigidity of the elastic Reference layer improved. Due to the increased thermal conductivity the overheating heat occurring at critical points is dissipated more quickly so that the critical temperature and thereby preventing hot spots from occurring. It is special the elongated formation of the particles for rapid heat dissipation advantageous from critical points, for example in the direction of the roll core.
  • the elongated rod shape of the particles also leads to the fact that those Particles that are oriented essentially in the radial direction, selectively increase the stiffness of the elastic cover layer.
  • the Elongated rod-shaped particles thus have an elastic reference layer Variety of points with increased stiffness, so that with a corresponding equipped roller transparent paper can be produced. Since the Particle length less than the radial thickness of the elastic reference layer the elongated particles do not extend from the Surface of the reference layer to the roller core, but it can be found areas between individual particles that are free of the particles, so that a certain elasticity of the reference layer is retained, whereby the quality of the tracing paper produced compared to a complete one stiff coating is increased.
  • the elongated ones designed according to the invention preferably have Particles have a ratio of their length to their thickness of between approximately 20: 1 and 5: 1, in particular of approximately 15: 1 and 7: 1, preferably of approximately 10: 1. With These preferred ratios become an ideal combination between Stiffness and elasticity of the cover layer achieved.
  • the elongated Particles are advantageous in radial in the matrix material and / or essentially statistically distributed in the axial direction, whereby uniform rigidity with uniform elasticity of the cover layer is reached over the length of the roller.
  • Particles in the matrix material are essentially radial Direction aligned so that the majority of the particles the stiffness of the elastic reference layer is defined. in principle it is also possible that the particles in the matrix material essentially statistically distributed, i.e. evenly aligned in all directions are. In this case the stiffness of the reference layer is lower, however, at the same time the thermal conductivity of the reference layer in axial direction is increased.
  • the particles are formed from thermally conductive material, the thermal conductivity of the particles is higher than that of the matrix material.
  • the thermal conductivity of the reference layer Depending on the amount of the introduced Particles will have the thermal conductivity of the reference layer this way increased, in particular by the radial direction aligned elongated particles a derivative of excess Heat within the reference layer to the metallic roll core takes place so that unwanted heat within the reference layer quickly to the roller core and can be discharged laterally via this.
  • the particles forming the fillers can all be made from the same Material or be made of different materials.
  • Coefficient of thermal expansion of the particles smaller than that of the matrix material.
  • the total coefficient of thermal expansion the reference layer is smaller than that of the matrix material, so that the total coefficient of thermal expansion at the coefficient of thermal expansion of the roll core can be adjusted. Thereby the longitudinal stresses that occur when the roller is heated reduced between the reference layer and the roll core.
  • a Part of the particles radially outwards to the surface of the elastic reference layer can already do this be introduced into the reference layer so that they are up to extend their surface. If the surface of the reference layer sanded after being applied to produce a high surface smoothness the elongated particles cannot at first reach all the way to the surface of the reference layer. After grinding the The ends of the elongated particles ultimately lie freely on the surface the surface so that they have the desired points of stiffness form.
  • Advantageous values for average lengths of the invention elongated particles are between approximately 200 and 600 ⁇ m, in particular between about 300 and 500 microns, preferably at about 400 microns.
  • the elongated Particles therefore have a length that is significantly below that Length of in the elastic reference layer, for example as reinforcement layers provided fibers, for example carbon fibers.
  • fibers are preferred embedded. These fibers can be in rovings or as nonwoven on the Roll core are applied and are usually used for reinforcement the elastic reference layer.
  • the Fibers arranged in radially successive layers of fibers can be spaced from one another or directly abut each other.
  • the elastic reference layer between about 5 and 100, in particular between about 20 and 70, preferred 30 to 40 fiber layers are available.
  • the reference layer can also have more or fewer fiber layers his.
  • the fiber layers reinforce the elastic reference layer achieved since usually only one consisting of matrix material Reference layer does not have the rigidity required for the satin finish. If the elastic reference layer is formed from several However, there is a risk of fiber layers if the connection is insufficient a tendency for the fiber layers to separate between the individual fiber layers exist.
  • the elongated particles are arranged between such a tendency to detach is counteracted by the individual fiber layers, because the elongated particles are particularly radial an additional connection between the individual fiber layers create.
  • the compensating thermal expansion coefficient also the service life a reference layer designed according to the invention by reduced Transfer tendency to be improved.
  • Fig. 1 shows a part of a cut in the longitudinal direction, for example existing steel or cast iron roll core 1, the outside with an elastic reference layer, also shown in section 2 is provided.
  • the reference layer 2 consists of an elastic matrix material 3, in particular from a resin / hardener combination in which a variety of Fibers 4 are embedded.
  • the fibers 4 for example around carbon fibers or around glass fibers or a mixture of Trade carbon and glass fibers.
  • the fibers 4 are essentially in aligned in the axial direction of the roller core 1 and form a fiber layer 5, which is applied, for example, by winding on the roll core 1 has been.
  • the fibers 4, on the one hand increase the rigidity of the reference layer 2 compared to a reference layer made of pure plastic increased and at the same time, especially when using carbon fibers, improves thermal conductivity in the axial direction.
  • these fillers include elongated, rod-shaped particles 6 and on the other hand fine-grained, the filler forming fine particles 7. While the fine particles are substantially quasi-spherical are formed and a diameter of, for example Have 10 to 20 microns, have the elongated rod-shaped particles a length of about 400 microns, for example.
  • Some of the elongated ones Particles 6 each extend with one end to the surface 8 of the reference layer 2, while others of the elongated particles 6 with their respective ends up to the surface 9 of the roll core 1 extend. All elongated particles 6 are however so formed so that its length is shorter than the radial thickness of the reference layer Second
  • the particles 6 reaching to the surface 8 of the reference layer 2 form 8 punctiform points 10 with increased rigidity on this surface, that with a uniform distribution of the particles 6 in the reference layer 2 accordingly evenly over their entire surface 8 are distributed. In particular with an essentially radial alignment the particle 6 becomes the stiffness of the reference layer at the points 10 2 significantly increased over their remaining areas.
  • the roller shown in FIG. 1 can be used for the production of transparent paper be used.
  • the thermal conductivity of the reference layer 2 increases because the particles 6 have better thermal conductivity possess than the matrix material 3 Direction or inclined particles 6 in particular the Thermal conductivity of the reference layer 2 improved in the radial direction, so that in addition to the improved thermal conductivity by the fiber layer 5 in the axial direction an improvement in a perpendicular to it direction.
  • the total thermal expansion coefficient approaches the reference layer 2 the expansion coefficient of the roll core 1. This applies especially when a large number of the particles 6 are oblique or essentially are arranged extending in the axial direction. Because the matrix material 3 usually has a significantly higher coefficient of thermal expansion owns than the roller core 1 can by reducing of the total thermal expansion coefficient of the reference layer 2 due to the elongated particles 6 when the roller is heated longitudinal stresses occurring between the roll core 1 and the reference layer be reduced.
  • the punctiform fine particles 7 can also be adapted the coefficient of thermal expansion of the reference layer 2 to the coefficient of thermal expansion serve the roll core 1 or other desired Define physical properties of the reference layer. Possibly the fine particles 7 can also be completely eliminated.
  • the fiber layer 5 can, for example, by winding fiber rovings or Nonwoven fabric can be produced on the roll core 1. This is more clearly shown in Fig. 2 to recognize where two fiber layers arranged radially spaced apart from one another 5 ', 5 "are shown schematically.
  • the fibers or fiber rovings can be in the liquid state before winding Matrix material 3 can be applied, for example, by a Matrix bath are drawn. However, it is also possible that the fibers or the fiber rovings are wound dry on the roll core 1 and soaked with or during matrix winding until you are completely surrounded by it. To be a smooth To reach surface 8 of the roller after the winding process top layer of the matrix material 3 is sanded off, creating a multitude of the elongated particles 6 appear on the surface 8 and thus form the punctiform points 10 of increased rigidity.
  • the two fiber layers 5 ′, 5 ′′ are connected to one another via the matrix material 3 connected, the lower fiber layer 5 "also via the matrix material 3 is connected to the surface 9 of the roll core 1.
  • the Reference layer 2 in the area of the fiber layers 5 ', 5 "due to the interlocking Fibers 4 is very stable, consists of the dashed Lines 11, 12 indicated areas between the fiber layers 5 'and 5 " or between the fiber layer 5 “and the surface 9 of the roll core 1 the risk that the reference layer will become detached when subjected to the appropriate stress 2 of the roll core 1 or the two the fiber layers 5 ', 5 " containing partial areas of the reference layer 2 from each other.
  • the elongated rod-shaped particles 6 is just in the endangered areas 11, 12 the connection of the different Sub-layers of the reference layer 2 improved.
  • the elongated particles 6 form reinforcing bridges in the radial direction, so that the overall stability the reference layer 2 significantly increased in the radial direction becomes.
  • the described tendency to detachment is according to the invention trained reference layer 2 is therefore not given.

Landscapes

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

Claims (15)

  1. Rouleau, en particulier pour le lissage de bandes de papier, avec un noyau de rouleau dur (1) se composant en particulier de métal, qui est muni sur son côté extérieur d'une couche de référence élastique (2) se composant d'un matériau de matrice (3) élastique et de matières de remplissage (6, 7) noyées dans le matériau de matrice (3), caractérisé en ce que, pour la production d'une pluralité de points (10) ayant une rigidité accrue à l'intérieur de la couche de référence (2),
    au moins une partie des matières de remplissage (6, 7) est configurée comme particules allongées en forme de barrettes (6),
    les particules (6) ont une rigidité plus importante que le matériau de matrice (3),
    au moins une partie des particules (6) est orientée sensiblement dans le sens radial dans le matériau de matrice (3) et
    la longueur des particules (6) est inférieure à l'épaisseur radiale de la couche de référence élastique (2), dans lequel la conductibilité thermique des particules (6) est plus importante que la conductibilité thermique du matériau de matrice (3).
  2. Rouleau selon la revendication 1, caractérisé en ce que les particules (6) disposent d'un rapport entre la longueur et l'épaisseur qui est d'environ 20 : 1 à 5 : 1, en particulier d'environ 15 : 1 à 7 : 1, de préférence de 10 : 1 et/ou en ce que les particules (6) sont réparties sensiblement de manière statistique en direction radiale et/ou en direction axiale dans le matériau de matrice (3).
  3. Rouleau selon la revendication 1 ou 2, caractérisé en ce qu'une partie prépondérante des particules (6) est orientée sensiblement en direction radiale dans le matériau de matrice (3).
  4. Rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une partie des particules (6) s'étend dans le sens radial vers l'intérieur jusqu'à la surface (9) du noyau de rouleau (1) et/ou en ce que le coefficient de dilatation thermique des particules (6) est inférieur à celui du matériau de matrice (3).
  5. Rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une partie des particules (6) s'étend dans le sens radial vers l'extérieur jusqu'à la surface (8) de la couche de référence élastique (2) et/ou en ce que les particules (6) ont une longueur moyenne située entre environ 200 et 600 µm, en particulier entre environ 300 et 500 µm, de préférence d'environ 400 µm et/ou en ce que les particules (6) se composent de wollastonite et/ou de silicate de calcium.
  6. Rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en plus des particules (6), des fibres (4) sont noyées dans le matériau de matrice (3), en particulier en ce que les fibres (4) sont disposées dans une couche de fibres (5) ou dans des couches de fibres (5', 5") se succédant dans le sens radial, dans lequel, de préférence, les couches de fibres (5', 5") sont espacées les unes des autres ou les couches de fibres se touchent mutuellement.
  7. Rouleau selon la revendication 6, caractérisé en ce que, dans la couche de référence élastique (2), se trouvent environ 5 à 100, en particulier environ 20 à 70, de préférence environ 30 à 40 couches de fibres (5, 5', 5") et/ou en ce que les particules (6) sont disposées entre les différentes couches de fibres (5', 5").
  8. Rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche de référence comprend une couche fonctionnelle située à l'extérieur dans le sens radial et une couche de liaison située à l'intérieur dans le sens radial pour relier la couche fonctionnelle avec le noyau de rouleau et en ce que les particules sont disposées au moins dans la couche fonctionnelle.
  9. Rouleau selon l'une quelconque des revendications 6 à 8, caractérisé en ce que les fibres (4) sont configurées comme fibres de verre et/ou comme fibres de carbone.
  10. Rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau de matrice (3) est un matériau synthétique, en particulier une résine thermodurcissable ou une matière thermoplastique et/ou en ce que le matériau de matrice (3) se compose d'une combinaison résine/durcisseur.
  11. Procédé pour la fabrication d'un rouleau élastique avec un noyau de rouleau dur se composant en particulier de métal et une couche de référence élastique se composant d'un matériau de matrice élastique, en particulier pour la fabrication d'un rouleau selon l'une quelconque des revendications précédentes, caractérisé en ce que pour la production d'une pluralité de points (10) ayant une rigidité accrue à l'intérieur de la couche de référence (2)
    au moins une matière de remplissage sous la forme de particules allongées en forme de barrettes (6) est introduite dans le matériau de matrice élastique;
    les particules (6) ayant une rigidité plus importante que le matériau de matrice (3),
    au moins une partie des particules (6) sont orientées sensiblement dans le sens radial dans le matériau de matrice (3) et
    la longueur des particules (6) est choisie inférieure à l'épaisseur radiale de la couche de référence élastique (2) et
       la conductibilité thermique des particules (6) est choisie plus importante que la conductibilité thermique du matériau de matrice (3).
  12. Procédé selon la revendication 11, caractérisé en ce qu'en plus des particules, des fibres sont noyées dans le matériau de matrice élastique.
  13. Procédé selon la revendication 12, caractérisé en ce que, pour la réalisation de la couche de référence, au moins un faisceau de fibres se composant d'une pluralité de fibres, en particulier en plusieurs couches de fibres superposées, est enroulé sur le noyau de rouleau et les particules sont introduites entre des couches de fibres voisines et/ou entre une couche de fibres et la surface du noyau de rouleau et/ou entre une couche de fibres et la surface de la couche de référence, dans lequel en particulier le faisceau de fibres est formé par un ou plusieurs stratifils de fibres et/ou par un non-tissé, un stratifil se composant respectivement d'une pluralité de fibres de même genre placées les unes à côté des autres, et/ou en ce que le faisceau de fibres est formé par un non-tissé.
  14. Procédé selon la revendication 13, caractérisé en ce que le faisceau de fibres est entouré par le matériau de matrice avant l'enroulement sur le noyau de rouleau en étant en particulier tiré à travers un bain de matrice, et en ce que les particules sont déjà contenues dans le matériau de matrice, en particulier dans le bain de matrice, et/ou sont introduites lors de l'enroulement dans le matériau de matrice entourant le faisceau de fibres, ou en ce que le faisceau de fibres est enroulé sensiblement à l'état sec sur le noyau de rouleau et est soumis à l'application du matériau de matrice pendant ou après l'enroulement en étant en particulier entièrement noyé dans le matériau de matrice, et en ce que les particules sont déjà contenues dans le matériau de matrice et/ou sont introduites dans le matériau de matrice après ou pendant l'application du matériau de matrice.
  15. Procédé selon l'une quelconque des revendications 12 à 14, caractérisé en ce que des fibres de verre et/ou des fibres de carbone sont utilisées comme fibres.
EP00105584A 1999-04-29 2000-03-16 Rouleau élastique et procédé pour la fabrication d' un tel rouleau Expired - Lifetime EP1048782B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19919569A DE19919569B4 (de) 1999-04-29 1999-04-29 Elastische Walze und Verfahren zum Herstellen einer solchen
DE19919569 1999-04-29

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EP1048782A1 EP1048782A1 (fr) 2000-11-02
EP1048782B1 true EP1048782B1 (fr) 2003-12-10

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US (1) US6428455B1 (fr)
EP (1) EP1048782B1 (fr)
DE (2) DE19919569B4 (fr)

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US7802377B2 (en) * 2005-01-05 2010-09-28 Voith Patent Gmbh Drying cylinder

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HUP0102860A3 (en) 1998-07-31 2003-08-28 Shuttleworth Inc Huntington Low electrostatic discharge conveyor and method of its operation
DE10046055A1 (de) 2000-09-18 2002-03-28 Voith Paper Patent Gmbh Elastische Walze
US6993861B2 (en) 2001-07-06 2006-02-07 Esco Corporation Coupling for excavating wear part
DE10159360A1 (de) * 2001-12-04 2003-06-12 Voith Paper Patent Gmbh Verfahren zum Aufwickeln einer laufenden Materialbahn sowie Wickelmaschine zur Durchführung des Verfahrens
WO2003056195A1 (fr) * 2001-12-26 2003-07-10 Yamauchi Corporation Rouleau de resine renforce de fibres et procede de fabrication d'un tel rouleau
US20060138279A1 (en) * 2004-12-23 2006-06-29 Nathan Pisarski Aircraft floor panel
JP5162864B2 (ja) * 2006-09-13 2013-03-13 株式会社リコー 導電性部材、プロセスカートリッジ及び画像形成装置
DE102009029695A1 (de) * 2009-09-23 2011-03-31 Voith Patent Gmbh Walzenbezug
DE102012103079A1 (de) 2012-04-10 2013-10-10 Krones Ag Rollenförderer für Kunststoffvorformlinge

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WO1998054405A1 (fr) * 1997-05-30 1998-12-03 Valmet Corporation Rouleau a revetement thermoplastique, procede de fabrication du rouleau, composition de revetement thermoplastique, procede de calandrage au moyen de rouleaux a revetement thermoplastique selon l'invention et papier/carton produit au moyen de ces rouleaux

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7802377B2 (en) * 2005-01-05 2010-09-28 Voith Patent Gmbh Drying cylinder

Also Published As

Publication number Publication date
DE19919569B4 (de) 2011-07-07
DE19919569A1 (de) 2000-11-02
DE50004692D1 (de) 2004-01-22
US6428455B1 (en) 2002-08-06
EP1048782A1 (fr) 2000-11-02

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