EP1041198B2 - Soft roll and process for making such a roll - Google Patents
Soft roll and process for making such a roll Download PDFInfo
- Publication number
- EP1041198B2 EP1041198B2 EP00105583A EP00105583A EP1041198B2 EP 1041198 B2 EP1041198 B2 EP 1041198B2 EP 00105583 A EP00105583 A EP 00105583A EP 00105583 A EP00105583 A EP 00105583A EP 1041198 B2 EP1041198 B2 EP 1041198B2
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- EP
- European Patent Office
- Prior art keywords
- roll
- matrix material
- roller
- elastic
- fibres
- 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
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- 238000000034 method Methods 0.000 title claims description 4
- 239000000835 fiber Substances 0.000 claims description 30
- 239000011159 matrix material Substances 0.000 claims description 17
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000009499 grossing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000004848 polyfunctional curative Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 2
- 230000007423 decrease Effects 0.000 claims 1
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 229920001187 thermosetting polymer Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 239000006223 plastic coating Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 238000003490 calendering Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229910000968 Chilled casting Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
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 roll, in particular for smoothing paper webs, comprising a hard roll core, in particular made of metal, which is provided on its outside with an elastic covering layer consisting of an elastic matrix material and fibers embedded in the matrix material. 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 elasticity of this second roller thus prevents excessive compaction of the paper web, which would lead to a greasy appearance of the paper web.
- the order of magnitude of the rolls is in lengths of 6 to 12 m or diameters of 800 to 1500 mm. They withstand line forces of up to 600 N / mm and compressive stresses of up to 50 N / mm 2 .
- the plastics commonly used for the coating have a significantly higher coefficient of thermal expansion than the steel rollers or chill rolls commonly used, so that a high temperature increase axial stresses between the steel roller or chill roller and the associated plastic coating occur.
- hot spots may occur at which detachment or even bursting of the plastic layer takes place.
- the elastic cover layer consists of a plurality of layers, wherein in each case an unreinforced layer alternately follows a fiber-reinforced layer.
- the elastic covering layer consists of a radially inner, fiber-reinforced layer and a radially outer, unreinforced elastic layer. Also in the US 3,490,119 a roller having such a structure of the reference layer is described.
- the cover layer consists of a plurality of different, fiber-reinforced layers, wherein the successive, individual fiber layers each include different angles with the longitudinal axis of the roller body.
- roller of the relevant part of the task is achieved by the features of claim 1.
- a corresponding method according to the invention is specified in claim 4.
- the reference layer has a thermal expansion coefficient, which is also different according to the fiber content in the radial direction from the inside out. Since usually the matrix material has a significantly higher coefficient of thermal expansion than the fiber material used, the respective resulting coefficient of thermal expansion of the fiber-interspersed matrix material thus depends both on the thermal expansion coefficient of the matrix material and that of the fibers. The more fibers that are embedded in the matrix material, the more the resulting coefficient of thermal expansion equals the thermal expansion coefficient of the fibers used.
- the fiber content in the radially outward regions of the cover layer must be chosen to be lower, otherwise the surface of the roller would be too hard and unsuitable for santinage.
- the fiber content in the radially outer region of the reference layer is substantially equal to zero. This ensures that the surface of the roller is as elastic as possible and after a corresponding Abschleifvorgang has a very smooth surface, since the fibers present in the reference layer do not reach to the surface of the cover layer. Furthermore, it is ensured in this way that the surface of the roller can be reground after a certain period of time, without the fibers present in the matrix material after the grinding process at the surface of the cover layer emerge from this and thereby reduce the smoothness of the surface.
- the nip width can also be set as required. Since, in a roller with a very elastic coating, the hard counter-roller presses more deeply into the soft covering of the elastic roller, the width of the nip in the direction of travel of the paper web becomes greater the more elastic the outside of the covering layer of the elastic roller is. Thus, by setting a certain fiber content profile and in particular a certain fiber content at the surface of the reference layer, a desired nip width can be generated.
- Fig. 1 shows a part of a longitudinally cut, for example made of steel roller core 1, which is provided on its outside with an elastic cover layer 2 also shown cut.
- the cover layer 2 consists of an elastic matrix material 3, in particular a resin / hardener combination, in which a plurality of fibers 4 are embedded.
- the fibers 4 may be, for example, carbon fibers or glass fibers or a mixture of carbon and glass fibers.
- the rigidity of the reference layer 2 is increased compared to a reference layer made of pure plastic and at the same time, especially when using carbon fibers, the thermal conductivity is improved.
- the fiber content in the radially inner region 5 of the reference layer 2 is significantly higher than in its radially outward region 6. This ensures that the reference layer 2 is more elastic in its radially outward region 6 than in its radially inner region. 5 so that, for example, in the interaction of the elastic roller with a hard roller, this hard roller relatively far presses into the elastic outer surface of the reference layer 2, whereby a circumferentially long press nip is formed.
- the thermal expansion coefficient of the cover layer 2 is also significantly influenced by the fibers 4. Since the metallic roll core 1 usually has a significantly lower coefficient of thermal expansion than the matrix material 3, the matrix material 3 expands significantly more than the roll core 1 with a corresponding heating in the axial direction. By adding the fibers 4, their coefficient of thermal expansion is of the order of magnitude of the thermal expansion coefficient of the roll core 1, it is achieved that in the region 5 of the reference layer 2, which has a high fiber content, the resulting coefficient of thermal expansion is similar to that of the roll core 1. As a result, with a corresponding heating, the region 5 expands in the axial direction by a similar value as the roller core 1, so that axially occurring longitudinal stresses are largely avoided.
- the substantially continuously radially outwardly decreasing fiber content within the cover layer 2 ensures that even within the cover layer 2 the longitudinal stresses occurring during heating in the course radially outwards each have only low values that can be absorbed by the elasticity of the matrix material 3 ,
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Paper (AREA)
Description
Die vorliegende Erfindung betrifft eine Walze, insbesondere zum Glätten von Papierbahnen, mit einen insbesondere aus Metall bestehenden harte Walzenkern, der an seiner Außenseite mit einer elastischen Bezugsschicht versehen ist, die aus einem elastischen Matrixmaterial und in das Matrixmaterial eingebetteten Fasern besteht. Weiterhin ist die Erfindung auf ein Verfahren zum Herstellen einer solchen Walze gerichtet.The present invention relates to a roll, in particular for smoothing paper webs, comprising a hard roll core, in particular made of metal, which is provided on its outside with an elastic covering layer consisting of an elastic matrix material and fibers embedded in the matrix material. Furthermore, the invention is directed to a method for producing such a roller.
Elastische Walzen dieser Art werden beispielsweise bei der Satinage von Papierbahnen verwendet. Dabei bildet jeweils eine elastische Walze zusammen mit einer harten Walze einen Preßspalt, durch den die zu bearbeitende Papierbahn hindurchgeführt wird. Während die harte Walze eine beispielsweise aus Stahl oder Hartguß bestehende sehr glatte Oberfläche besitzt und für die Glättung der ihr zugewandten Seite der Papierbahn zuständig ist, bewirkt die auf die gegenüberliegende Seite der Papierbahn einwirkende elastische Walze eine Vergleichmäßigung und Verdichtung der Papierbahn im Preßnip. Durch die Elastizität dieser zweiten Walze wird somit eine zu starke Verdichtung der Papierbahn verhindert, die zu einem speckigen Aussehen der Papierbahn führen würde. Die Größenordnung der Walzen liegt bei Längen von 6 bis 12 m bzw. Durchmessern von 800 bis 1500 mm. Sie halten Linienkräften bis zu 600 N/mm und Druckspannungen bis 50 N/mm2 stand.Elastic rolls of this type are used, for example, in the calendering of paper webs. In each case, an elastic roller together with a hard roller forms a press nip through which the paper web to be processed is passed. While 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 elasticity of this second roller thus prevents excessive compaction of the paper web, which would lead to a greasy appearance of the paper web. The order of magnitude of the rolls is in lengths of 6 to 12 m or diameters of 800 to 1500 mm. They withstand line forces of up to 600 N / mm and compressive stresses of up to 50 N / mm 2 .
Da die Tendenz bei der Papierherstellung dahin geht, daß die Satinage im Online-Betrieb erfolgt, d.h. daß die die Papiermaschine oder Streichmaschine verlassende Papierbahn unmittelbar durch die Papierglättvorrichtung (Kalander) geführt wird, werden an die Walzen der Glättvorrichtung insbesondere bezüglich der Temperaturbeständigkeit höhere Anforderungen als bisher gestellt. Durch die im Online-Betrieb erforderlichen hohen Transportgeschwindigkeiten der Papierbahn und die damit verbundenen hohen Rotationsgeschwindigkeiten der Kalanderwalzen wird deren Biegewechselfrequenz erhöht, was wiederum zu erhöhten Walzentemperaturen führt. Diese im Online-Betrieb entstehenden hohen Temperaturen führen zu Problemen, die bei bekannten elastischen Walzen bis zur Zerstörung des Kunststoffbelages führen können. Zum einen sind bei bekannten Kunststoffbelägen maximale Temperaturdifferenzen von ca. 20°C über die Breite der Walze zulässig und zum anderen besitzen die für die Beschichtung üblicherweise verwendeten Kunststoffe einen wesentlich höheren Temperaturausdehnungskoeffizienten als die üblicherweise verwendeten Stahlwalzen bzw. Hartgußwalzen, so daß durch eine Temperaturerhöhung hohe axiale Spannungen zwischen der Stahlwalze bzw. Hartgußwalze und der mit ihr verbundenen Kunststoffbeschichtung auftreten.Since the tendency in papermaking is that the calendering is done online, i. E. that the paper web leaving the paper machine or coater is guided directly through the paper smoothing device (calender), higher demands than before are placed on the rollers of the smoothing device, in particular with regard to the temperature resistance. Due to the high transport speeds of the paper web required in online operation and the associated high rotational speeds of the calender rolls, their bending cycle frequency is increased, which in turn leads to increased rolling temperatures. These high temperatures produced in online operation lead to problems that can lead to the destruction of the plastic coating in known elastic rollers. On the one hand, maximum temperature differences of about 20 ° C. across the width of the roller are permissible in known plastic coverings and, on the other hand, the plastics commonly used for the coating have a significantly higher coefficient of thermal expansion than the steel rollers or chill rolls commonly used, so that a high temperature increase axial stresses between the steel roller or chill roller and the associated plastic coating occur.
Durch diese hohen Spannungen verbunden mit insbesondere punktuell auftretenden Erhitzungsstellen innerhalb der Kunststoffbeschichtung können sogenannte Hot-Spots auftreten, an denen ein Ablösen oder sogar ein Aufplatzen der Kunststoffschicht erfolgt.Due to these high voltages associated with, in particular, occasionally occurring heating points within the plastic coating, so-called hot spots may occur at which detachment or even bursting of the plastic layer takes place.
Diese Hot-Spots treten insbesondere dann auf, wenn zusätzlich zu den mechanischen Spannungen und der relativ hohen Temperatur Kristallisierungspunkte in Form von beispielsweise fehlerhaften Klebungen, Ablagerungen oder überdurchschnittliche Einbuchtungen des elastischen Belages, beispielsweise durch Falten oder Fremdkörper an der Papierbahn, vorhanden sind. In diesen Fällen kann die Temperatur an diesen Kristallisierungspunkten von üblichen 80°C bis 90°C bis auf über 150°C steigen, wodurch die erwähnte Zerstörung der Kunststoffschicht erfolgt.These hot spots occur in particular when, in addition to the mechanical stresses and the relatively high temperature, crystallization points in the form of, for example, defective adhesions, deposits or above-average indentations of the elastic covering, for example due to folds or foreign bodies on the paper web, are present. In these cases, the temperature at these crystallization points of usual 80 ° C to 90 ° C rise to above 150 ° C, whereby the mentioned destruction of the plastic layer takes place.
Aus der
Aus der
In der
Es ist eine Aufgabe der vorliegenden Erfindung ein Verfahren zur Herstellung einer elastischen Walze der eingangs genannten Art sowie eine entsprechende Walze anzugeben, bei der die Gefahr des Auftretens von Hot-Spots bei zumindest gleichbleibenden mechanischen Eigenschaften verringert wird.It is an object of the present invention to provide a method for producing an elastic roller of the aforementioned type and a corresponding roller, in which the risk of the occurrence of hot spots is reduced with at least constant mechanical properties.
Der die Walze betreffende Teil der Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Ein entsprechendes erfindungsgemäßes Verfahren ist im Anspruch 4 angegeben.The roller of the relevant part of the task is achieved by the features of claim 1. A corresponding method according to the invention is specified in claim 4.
Durch die Variierung des Fasergehalts der Bezugsschicht radial von innen nach außen wird erreicht, daß die Bezugsschicht einen Wärmeausdehnungskoeffizienten besitzt, der entsprechend dem Fasergehalt ebenfalls in radialer Richtung von innen nach außen unterschiedlich ist. Da üblicherweise das Matrixmaterial einen deutlich höheren Wärmeausdehnungskoeffizienten hat als das verwendete Fasermaterial, ist somit der jeweils resultierende Wärmeausdehnungskoeffizient des mit Fasern durchsetzten Matrixmaterials sowohl von dem Wärmeausdehnungskoeffizienten des Matrixmaterials als auch dem der Fasern abhängig. Je mehr Fasern in dem Matrixmaterial eingebettet sind, desto mehr gleicht sich der resultierende Wärmeausdehnungskoeffizient dem Wärmeausdehnungskoeffizienten der verwendeten Fasern an.By varying the fiber content of the reference layer radially from the inside to the outside is achieved that the reference layer has a thermal expansion coefficient, which is also different according to the fiber content in the radial direction from the inside out. Since usually the matrix material has a significantly higher coefficient of thermal expansion than the fiber material used, the respective resulting coefficient of thermal expansion of the fiber-interspersed matrix material thus depends both on the thermal expansion coefficient of the matrix material and that of the fibers. The more fibers that are embedded in the matrix material, the more the resulting coefficient of thermal expansion equals the thermal expansion coefficient of the fibers used.
Auf diese Weise ist es möglich, den Wärmeausdehnungskoeffizienten des radial innenliegenden Bereichs der Bezugsschicht durch einen relativ hohen Fasergehalt so einzustellen, daß er im wesentlichen gleich ist oder in der gleichen Größenordnung liegt wie der Wärmeausdehnungskoeffizient des Walzenkerns. Bei einer Erwärmung der Walze im Betrieb dehnen sich somit die radial innengelegenen Bereiche der Bezugsschicht um im wesentlichen den gleichen Wert aus, wie der Walzenkern, so daß hohe axiale Längsspannungen zwischen dem Walzenkern und der Bezugsschicht vermieden werden.In this way, it is possible to set the coefficient of thermal expansion of the radially inner portion of the cover layer by a relatively high fiber content to be substantially the same or of the same order as the thermal expansion coefficient of the roller core. Thus, when the roll is heated during operation, the radially inward regions of the cover layer expand to substantially the same value as the roll core, so that high axial longitudinal stresses between the roll core and the cover layer are avoided.
Da ein hoher Fasergehalt auch die Steifigkeit der Bezugsschicht deutlich erhöht, muß in den radial außengelegenen Bereichen der Bezugsschicht der Fasergehalt niedriger gewählt werden, da andernfalls die Oberfläche der Walze zu hart ist und für die Santinage nicht geeignet wäre. Durch einen insbesondere im wesentlichen kontinuierlich radial nach außen abnehmenden Fasergehalt innerhalb der Bezugsschicht wird erreicht, daß bei einer Erhitzung der Walze die innerhalb der Bezugsschicht auftretenden Längsspannungen, die aufgrund der unterschiedlichen Wärmeausdehnung der verschiedenen Bereiche der Bezugsschicht entstehen, an keiner Stelle so groß werden, daß eine Ablösung oder Zerstörung der Bezugsschicht entsteht.Since a high fiber content also significantly increases the stiffness of the cover layer, the fiber content in the radially outward regions of the cover layer must be chosen to be lower, otherwise the surface of the roller would be too hard and unsuitable for santinage. By a particularly substantially continuously radially outwardly decreasing fiber content within the reference layer is achieved that at a heating of the roller occurring within the reference layer longitudinal stresses that arise due to the different thermal expansion of the different regions of the reference layer, at any point so large that a detachment or destruction of the reference layer arises.
Nach einer vorteilhaften Ausführungform der Erfindung ist im radial außengelegenen Bereich der Bezugsschicht der Fasergehalt im wesentlichen gleich Null. Dadurch wird erreicht, daß die Oberfläche der Walze möglichst elastisch ist und nach einem entsprechenden Abschleifvorgang eine sehr glatte Oberfläche besitzt, da die in der Bezugsschicht vorhandenen Fasern nicht bis an die Oberfläche der Bezugsschicht reichen. Weiterhin ist auf diese Weise gewährleistet, daß die Oberfläche der Walze nach einer gewissen Laufzeit nachgeschliffen werden kann, ohne daß die in dem Matrixmaterial vorhanden Fasern nach dem Schleifvorgang an der Oberfläche der Bezugsschicht aus dieser austreten und dadurch die Glätte der Oberfläche verringern würden.According to an advantageous embodiment of the invention, the fiber content in the radially outer region of the reference layer is substantially equal to zero. This ensures that the surface of the roller is as elastic as possible and after a corresponding Abschleifvorgang has a very smooth surface, since the fibers present in the reference layer do not reach to the surface of the cover layer. Furthermore, it is ensured in this way that the surface of the roller can be reground after a certain period of time, without the fibers present in the matrix material after the grinding process at the surface of the cover layer emerge from this and thereby reduce the smoothness of the surface.
Durch eine geeignete Wahl des Fasergehaltsverlaufs kann auch die Nipbreite wie erforderlich eingestellt werden. Da bei einer Walze mit einem sehr elastischen Belag die harte Gegenwalze sich stärker in den weichen Belag der elastischen Walze eindrückt, wird die Breite des Nips in Laufrichtung der Papierbahn um so größer, je elastischer die Außenseite der Bezugsschicht der elastischen Walze ist. Somit kann durch die Einstellung eines bestimmten Fasergehaltverlaufes und insbesondere eines bestimmten Fasergehaltes an der Oberfläche der Bezugsschicht eine gewünschte Nipbreite erzeugt werden.By a suitable choice of the fiber content profile, the nip width can also be set as required. Since, in a roller with a very elastic coating, the hard counter-roller presses more deeply into the soft covering of the elastic roller, the width of the nip in the direction of travel of the paper web becomes greater the more elastic the outside of the covering layer of the elastic roller is. Thus, by setting a certain fiber content profile and in particular a certain fiber content at the surface of the reference layer, a desired nip width can be generated.
Weitere vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen angegeben. Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher beschrieben; in dieser zeigt:
- Fig. 1
- einen Teillängsschnitt durch eine erfindungsgemäß ausgebildete Walze mit elastischer Bezugsschicht.
- Fig. 1
- a partial longitudinal section through an inventively formed roller with elastic cover layer.
Die Bezugsschicht 2 besteht aus einem elastischen Matrixmaterial 3, insbesondere einer Harz/Härter-Kombination, in die eine Vielzahl von Fasern 4 eingebettet sind. Bei den Fasern 4 kann es sich dabei beispielsweise um Kohlefasern oder um Glasfasern oder um eine Mischung aus Kohle- und Glasfasern handeln.The cover layer 2 consists of an elastic matrix material 3, in particular a resin / hardener combination, in which a plurality of fibers 4 are embedded. The fibers 4 may be, for example, carbon fibers or glass fibers or a mixture of carbon and glass fibers.
Durch die Fasern 4 wird zum einen die Steifigkeit der Bezugsschicht 2 gegenüber einer aus reinem Kunststoff bestehenden Bezugsschicht erhöht und gleichzeitig, insbesondere bei Verwendung von Kohlefasern, die Wärmeleitfähigkeit verbessert.By the fibers 4, on the one hand, the rigidity of the reference layer 2 is increased compared to a reference layer made of pure plastic and at the same time, especially when using carbon fibers, the thermal conductivity is improved.
Der
Weiterhin wird durch die Fasern 4 auch der Wärmeausdehnungskoeffizient der Bezugsschicht 2 wesentlich mitbestimmt. Da der metallische Walzenkern 1 üblicherweise einen deutlich geringeren Wärmeausdehnungskoeffizienten besitzt als das Matrixmaterial 3, dehnt sich das Matrixmaterial 3 bei eine entsprechenden Erwärmung in axialer Richtung deutlich mehr aus als der Walzenkern 1. Durch die Hinzugabe der Fasern 4, deren Wärmeausdehnungskoeffizient in der Größenordnung des Wärmeausdehnungskoeffizienten des Walzenkerns 1 liegt, wird erreicht, daß im Bereich 5 der Bezugsschicht 2, der einen hohen Fasergehalt besitzt, der resultierende Wärmeausdehnungskoeffizient ähnlich dem des Walzenkerns 1 ist. Dadurch dehnt sich bei einer entsprechenden Erwärmung der Bereich 5 in axialer Richtung um einen ähnlichen Wert aus, wie der Walzenkern 1, so daß axial auftretende Längsspannungen weitgehend vermieden werden.Furthermore, the thermal expansion coefficient of the cover layer 2 is also significantly influenced by the fibers 4. Since the metallic roll core 1 usually has a significantly lower coefficient of thermal expansion than the matrix material 3, the matrix material 3 expands significantly more than the roll core 1 with a corresponding heating in the axial direction. By adding the fibers 4, their coefficient of thermal expansion is of the order of magnitude of the thermal expansion coefficient of the roll core 1, it is achieved that in the region 5 of the reference layer 2, which has a high fiber content, the resulting coefficient of thermal expansion is similar to that of the roll core 1. As a result, with a corresponding heating, the region 5 expands in the axial direction by a similar value as the roller core 1, so that axially occurring longitudinal stresses are largely avoided.
Durch den im wesentlich kontinuierlich radial nach außen abnehmenden Fasergehalt innerhalb der Bezugsschicht 2 ist gewährleistet, daß auch innerhalb der Bezugsschicht 2 die bei einer Erwärmung auftretenden Längsspannungen im Verlauf radial nach außen jeweils nur geringe Werte besitzen, die durch die Elastizität des Matrixmaterial 3 aufgenommen werden können.The substantially continuously radially outwardly decreasing fiber content within the cover layer 2 ensures that even within the cover layer 2 the longitudinal stresses occurring during heating in the course radially outwards each have only low values that can be absorbed by the elasticity of the matrix material 3 ,
- 11
- Walzenkernroll core
- 22
- elastische Bezugsschichtelastic cover layer
- 33
- Matrixmaterialmatrix material
- 44
- Fasernfibers
- 55
- innenliegender Bereich der Bezugsschichtinternal area of the cover layer
- 66
- außenliegender Bereich der Bezugsschichtoutboard portion of the cover layer
- 77
- Faserlagenfiber layers
Claims (5)
- A roll, in particular for smoothing paper webs, having a hard roll core (1) which consists in particular of metal and which is provided on its outer side with a resilient covering layer (2), which consists of a resilient matrix material (3, 3') and of fibres (4) embedded in the matrix material (3, 3'), characterized in that the fibre content of the covering layer (2) decreases continuously radially from the inside to the outside.
- A roll in accordance with claim 1, characterized in that the fibre content is essentially zero in the radially outwardly disposed region (6) of the covering layer (2).
- A roll in accordance with any one of the preceding claims, characterized in that the fibres (4) are formed as glass and/or as carbon fibres; and/or in that the matrix material (3) is a plastic, in particular a thermosetting plastic or a thermoplastic; and/or in that the matrix material (3) consists of a resin/hardener combination.
- A method for producing a resilient roll having a hard roll core consisting in particular of metal and a resilient covering layer, which consists of a resilient matrix material and of fibres embedded therein, in particular for producing a roll in accordance with any one of the preceding claims, characterized in that the fibre content of the covering layer is decreased continuously in a radial direction from the inside to the outside.
- A method in accordance with claim 4, characterized in that the fibres used are glass and/or carbon fibres.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19914710A DE19914710A1 (en) | 1999-03-31 | 1999-03-31 | Elastic roller and method of making it |
| DE19914710 | 1999-03-31 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1041198A1 EP1041198A1 (en) | 2000-10-04 |
| EP1041198B1 EP1041198B1 (en) | 2006-06-21 |
| EP1041198B2 true EP1041198B2 (en) | 2010-02-03 |
Family
ID=7903146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00105583A Expired - Lifetime EP1041198B2 (en) | 1999-03-31 | 2000-03-16 | Soft roll and process for making such a roll |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6319185B1 (en) |
| EP (1) | EP1041198B2 (en) |
| DE (2) | DE19914710A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19951038A1 (en) * | 1999-10-22 | 2001-04-26 | Voith Paper Patent Gmbh | Elastic roller |
| DE19952320A1 (en) * | 1999-10-29 | 2001-05-03 | Voith Paper Patent Gmbh | Elastic roller and method for producing such a roller |
| FI116082B (en) | 2001-02-27 | 2005-09-15 | Metso Paper Inc | Method of adjusting properties of the polymer coating of the roller or belt |
| DE10129107C2 (en) * | 2001-06-16 | 2003-08-14 | Westland Gummiwerke Gmbh & Co | Roller for fluid film processing or processing |
| DE102004025116A1 (en) | 2004-05-21 | 2005-12-08 | Voith Paper Patent Gmbh | Fiber composite roll cover for machines processing flat materials comprises a compound whose composition varies in different areas |
| US8156597B2 (en) * | 2005-07-14 | 2012-04-17 | Kegel, LLC. | Cushion roll for bowling lane cleaning machine |
| FI20070244A0 (en) | 2007-03-23 | 2007-03-23 | Metso Paper Inc | rolling |
| DE102009029695A1 (en) * | 2009-09-23 | 2011-03-31 | Voith Patent Gmbh | roll cover |
| DE102010049457A1 (en) * | 2010-10-22 | 2012-04-26 | Paul Sauer Gmbh & Co. Walzenfabrik Kg | Roller or roller element with reinforced roll shell |
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| DE2128294A1 (en) † | 1971-06-07 | 1973-01-04 | Dunbeath Holdings Pty Ltd N D | Roller for paper mfr or steel processing - of elastomer sleeve outside fibre reinforced plastic sleeve |
| US3852862A (en) † | 1972-11-08 | 1974-12-10 | New Hudson Corp | Roll and method of manufacture |
| DE2617741A1 (en) † | 1976-04-23 | 1977-11-03 | Heidelberg Portland Zement | PROCESS FOR PRODUCING FIBER-REINFORCED HYDRAULICALLY HARDENING MASSES OF PRE-DETERMINABLE SHAPE |
| DE3029288A1 (en) † | 1979-08-10 | 1981-03-26 | Yamauchi Corp., Hirakata, Osaka | ROLLS COVERED WITH AN ELASTOMERIC MATERIAL AND METHOD FOR THEIR PRODUCTION |
| DE19736575A1 (en) † | 1997-08-22 | 1999-03-11 | Freudenberg Carl Fa | Laminar roller of synthetic resin with embedded fibers |
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| US3467009A (en) * | 1965-07-06 | 1969-09-16 | Grace W R & Co | Compressible printing roll |
| US3406248A (en) * | 1966-10-27 | 1968-10-15 | Anaconda Wire & Cable Co | Cable with extruded covering having fibrous interlayer |
| US3514312A (en) * | 1967-07-12 | 1970-05-26 | Barrier Corp The | Process for coating a metal surface |
| US3490119A (en) * | 1968-10-23 | 1970-01-20 | Yamauchi Rubber Ind Co Ltd | Polyurethane rubber covered roll |
| DE1807331A1 (en) * | 1968-11-06 | 1970-06-11 | Yamauchi Rubber Ind Co Ltd | Polyurethane rubber covered roll |
| DE2514294C2 (en) * | 1975-04-02 | 1985-01-03 | Continental Gummi-Werke Ag, 3000 Hannover | Shell of a roller for the pressure treatment of webs |
| JPS5724216A (en) * | 1980-07-21 | 1982-02-08 | Fuji Photo Film Co Ltd | Supercalender |
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| US4940445A (en) * | 1989-09-27 | 1990-07-10 | Desportes Aubrey S | Tire and process for making a tire |
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| DE19511153C2 (en) * | 1995-03-27 | 1997-04-30 | Voith Sulzer Finishing Gmbh | Calender roller, in particular for paper treatment |
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| FI111025B (en) * | 1997-05-30 | 2003-05-15 | Metso Paper Inc | A roll having a thermoplastic coating, a method of making the roll, a composition of a thermoplastic surface coating, a calendering process using rolls with a thermoplastic coating of the invention, and a paper / board made by the rollers |
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- 1999-03-31 DE DE19914710A patent/DE19914710A1/en not_active Withdrawn
-
2000
- 2000-03-16 DE DE50013013T patent/DE50013013D1/en not_active Expired - Lifetime
- 2000-03-16 EP EP00105583A patent/EP1041198B2/en not_active Expired - Lifetime
- 2000-03-30 US US09/538,285 patent/US6319185B1/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2128294A1 (en) † | 1971-06-07 | 1973-01-04 | Dunbeath Holdings Pty Ltd N D | Roller for paper mfr or steel processing - of elastomer sleeve outside fibre reinforced plastic sleeve |
| US3852862A (en) † | 1972-11-08 | 1974-12-10 | New Hudson Corp | Roll and method of manufacture |
| DE2617741A1 (en) † | 1976-04-23 | 1977-11-03 | Heidelberg Portland Zement | PROCESS FOR PRODUCING FIBER-REINFORCED HYDRAULICALLY HARDENING MASSES OF PRE-DETERMINABLE SHAPE |
| DE3029288A1 (en) † | 1979-08-10 | 1981-03-26 | Yamauchi Corp., Hirakata, Osaka | ROLLS COVERED WITH AN ELASTOMERIC MATERIAL AND METHOD FOR THEIR PRODUCTION |
| DE19736575A1 (en) † | 1997-08-22 | 1999-03-11 | Freudenberg Carl Fa | Laminar roller of synthetic resin with embedded fibers |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1041198A1 (en) | 2000-10-04 |
| DE19914710A1 (en) | 2000-10-05 |
| EP1041198B1 (en) | 2006-06-21 |
| US6319185B1 (en) | 2001-11-20 |
| DE50013013D1 (en) | 2006-08-03 |
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