EP2128337B1 - Procédé de fonctionnement d'une calandre et calandre - Google Patents

Procédé de fonctionnement d'une calandre et calandre Download PDF

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Publication number
EP2128337B1
EP2128337B1 EP09160981A EP09160981A EP2128337B1 EP 2128337 B1 EP2128337 B1 EP 2128337B1 EP 09160981 A EP09160981 A EP 09160981A EP 09160981 A EP09160981 A EP 09160981A EP 2128337 B1 EP2128337 B1 EP 2128337B1
Authority
EP
European Patent Office
Prior art keywords
nip
calender
forming element
roller
movement
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.)
Not-in-force
Application number
EP09160981A
Other languages
German (de)
English (en)
Other versions
EP2128337A1 (fr
Inventor
Lothar Dr. Zimmermann
Thomas Vetter
Hans-Peter Koch
Joachim Hinz
Rolf Van Haag
Dominik Lemken
Volker Schoelzke
Jochen Dr. Niemann
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
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2128337A1 publication Critical patent/EP2128337A1/fr
Application granted granted Critical
Publication of EP2128337B1 publication Critical patent/EP2128337B1/fr
Not-in-force legal-status Critical Current
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
    • D21G1/0073—Accessories for calenders
    • D21G1/008—Vibration-preventing or -eliminating devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a method of operating a calender with at least one nip delimited by two nip-forming elements, in which one closes the nip and sets the surface of the nip-forming elements in a revolving motion, forming the revolving movement of a nip Elements superimposed at least in the nip a vibrational movement.
  • the invention relates to a calender with at least one nip, which is bounded by two nip-forming elements, of which at least one has a circulating movement generating drive, wherein the nip-forming element has an auxiliary drive, which is controlled at a higher frequency than the drive and generates a vibratory motion in the nip across the nip direction.
  • the invention will be described below in connection with a calender used to treat a paper web. But it is also applicable when other webs are treated in the calender, such as cardboard sheets.
  • the nip-forming elements are often formed as cylindrical rollers. But they can also be designed as shoe rollers or as a metal band. Of the sake of simplicity, the following explanation will be made using the example of rolls for the nip-forming elements.
  • DE 102 38 949 B3 suggests to generate a relative speed between the web and the surface during the passage of a portion of the web and dispose of the portion of the web.
  • DE 100 08 800 A1 describes a roller in the interior of an active vibration is generated, which acts on the roll shell.
  • an actuator is arranged in the interior.
  • the invention has for its object to reduce effects of barrings.
  • This object is achieved in a method of the type mentioned in that it brings about by the oscillatory motion of at least one nip forming element erosion.
  • a torque oscillation is generated in addition to a drive torque.
  • the drive torque generates the circumferential movement of the surface of the nip-forming element. If one superposes a torque oscillation on this revolving movement, then the surface of the nip-forming element in the nip briefly moves faster and for a short time slower than the average speed. This results in a relative movement between the surface of the nip-forming element and the surface of the adjacent nip-forming element, which causes the machine-wide grinding.
  • one of the nip forming elements is vibrated parallel to a direction of travel of a web through the nip. Relative to a roller, this means that you create a tangential movement in the nip. This movement can be generated, for example, by a suitable excitation of a torque support or a bearing.
  • a synchronous motor is used to generate the oscillatory motion.
  • a synchronous motor which is controlled by a frequency converter, can be controlled with a relatively high frequency, so that you can generate the desired vibrations using the synchronous motor.
  • one adapts the phase position of the oscillatory motion to a determined by a measurement barring pattern, wherein a relative movement between the two nip-forming elements in the region of a wave crest of the barring pattern is greater than in the region of a wave trough.
  • a relative movement between the two nip-forming elements in the region of a wave crest of the barring pattern is greater than in the region of a wave trough.
  • one uses a drive torque with a size in the range for generating the oscillatory motion from 1 to 50% of the drive moment of the nip-forming element. This ensures that the nip-forming element can still perform a circulating movement, ie can rotate in the case of a roller.
  • the drive torque additionally generated to generate the oscillatory motion has a magnitude sufficient to produce the relative movement on the surface of the nip-forming element.
  • a vibrational motion is generated at a frequency in the range of 30 Hz to 2000 Hz. This is a relatively high frequency, which is significantly higher than the rotational frequency of the nip-forming element. The greater one chooses the distance of the corresponding frequencies, the lower the risk that these frequencies influence each other negatively.
  • a frequency is used at which the nip-forming element still performs a rigid body movement.
  • the nip-forming element still performs a rigid body movement.
  • the additionally Siliconpulste torque leads to a slightly higher overall wear at a significantly extended roller life.
  • the vibration movement is generated before a barring pattern on the nip-forming element has a depth of 5 ⁇ m achieved. Even with smaller barring patterns with a depth of 1 to 2 microns on the surface of the nip-forming element shows a significant noise on the calender. If the barring pattern is impressed with more than 10 to 20 microns in the elastic cover of a roll, then the barring strips are detectable in the web. If, on the other hand, you intervene relatively early and reduce or remove the barring pattern due to machine-wide grinding, then you can significantly increase the service life of the nip-forming elements.
  • the object is achieved in a calender of the type mentioned above in that the oscillating movement causes a removal of at least one nip-forming element.
  • the auxiliary drive is only put into operation if you actually want to eliminate the barring pattern. In "normal" production, the auxiliary drive is out of action.
  • a vibrational movement of the nip-forming element is generated, which is anyway directed in the nip parallel to the direction of rotation. Since the other nip-forming element does not have this oscillatory motion, arises a relative movement, with the help of which one can effect a machine-wide grinding of the nip-forming element.
  • the auxiliary drive has a synchronous motor which is connected to a frequency converter.
  • the frequency converter drives the synchronous motor at the desired higher frequency to produce the oscillatory motion.
  • the frequency converter is connected to at least one vibration sensor which determines a vibration of the nip-forming element and / or in the calender. It is thus possible to control the frequency converter in order to achieve optimum grinding of the barring pattern on the nip-forming element.
  • the auxiliary drive preferably has a driven torque support. Even with this, the desired additional movement can be generated in the form of a vibration.
  • a calender 1 has two rollers 2, 3 as nip-forming elements.
  • the roller 2 is designed as a "soft roll", ie it has an elastic cover their surface.
  • the other roller 3 is formed as a hard roller having a peripheral surface of steel or cast, which is substantially harder than the surface of the soft roll. 2
  • a nip 4 is formed, which is closed in the drawing.
  • a web is guided by the closed nip 4, for example a paper or board web.
  • the calender 1 is then used to satinize this web.
  • the nip 4 can be closed so that the two rollers 2, 3 lie directly against each other.
  • the web In the production operation of the calender 1, in which the web is calendered, it can be observed after a certain operating time that results in a barring formation.
  • the barrings are strips that run transversely to the direction of the web. Once these streaks become visible, the web is broke, which must be disposed of. In some cases, there is already a quality deficiency before the streaks become visible.
  • the barrings are formed by vibrations that imprint a pattern in the surface of the soft roll 2. Usually there is a significant noise on the calender 1 when the barring pattern has a depth of 1 to 2 microns. If the barring pattern is imprinted more than 10 to 20 microns in the elastic cover, then the variations in thickness are visible with visible streaks in the web.
  • a sensor 5 is provided to inspect the surface of the soft roll continuously or from time to time. At the latest when the barring pattern has a depth of 5 ⁇ m, a signal indicating that condition is generated. One can then initiate by an operator or automatically a machine-wide grinding process.
  • the roller 2 has a rotary drive 6.
  • the roller 3 has a rotary drive 7.
  • the two rotary drives 6, 7 are coordinated so that the two rollers 2, 3 in the normal production, ie in the calendering of the web, which is guided by the nip 4, rotate at the same peripheral speed.
  • the two rotary drives 6, 7 act on roll cams 8, 9 or otherwise on the rollers 2, 3rd
  • the soft roller 2 has at its other end an auxiliary drive 10, which is shown here for explanation smaller.
  • the auxiliary drive 10 is designed as a synchronous motor which provides a drive torque which corresponds to approximately 1 to 50% of the nominal torque of the rotary drive 6 of the soft roller 2.
  • the auxiliary drive 10 acts on the roll pin 11 at the other End, ie the end facing away from the rotary drive, on the roller. 2
  • the auxiliary drive 10 is connected to a frequency converter 12, which forms part of a control device 13.
  • the sensor 5, which determines the barring pattern, is connected to the control device 13.
  • a vibration sensor 14 which detects a vibration of the soft roller 2. In a manner not shown further vibration sensors 14 may be provided.
  • the auxiliary drive 10 is driven by the frequency converter with a relatively high frequency.
  • the frequency can be in the range of 30 to 2000 Hz. In rolls, however, it is advantageous to choose the frequency so that the roller 2 still performs a vibration in the form of a rigid body movement. In this case, the frequency is for example 30 to 150 Hz.
  • the rotational frequency of the roller is in the range of 5 to 15 Hz.
  • auxiliary drive 10 By the action of the auxiliary drive 10 now lead the two rollers 2, 3 in the nip 4 at a constant circumferential speed in the circumferential direction reciprocating motion relative to each other, which causes the soft roller 2 through the hard roller 3 or the guided through the nip 4 track is sanded. If you start grinding enough early enough, for example at the depth of the barring pattern of the order of 1 to 2 ⁇ m, then only a relatively small material thickness must be removed. This can be achieved in a reasonable time, for example, has an order of 15 to 120 minutes.
  • the time required for machine-wide grinding of the soft roll 2 by means of the web is somewhat shorter.
  • a paper web has a coefficient of friction with respect to the plastic cover of the soft roll in the range of 0.2 to 0.4.
  • the coefficient of friction of a steel roller against a plastic roller is about half. Accordingly, if you pass a web through the nip 4 for grinding, you only need half the time that would be required if the two rolls 2, 3 are in direct contact with each other.
  • the torque oscillations which are generated by means of the auxiliary drive 10, are adapted with their phase position to the phase position of the barring pattern.
  • the phase position of the barring pattern can be determined by the sensor 5.
  • a relatively large relative movement is produced between the roller 2 and the roller 3 or between the roller 2 and the path guided through the nip 4 when a mountain of the barring pattern is in the nip 4, and a relatively small relative movement when a Valley of the Barring pattern located in nip 4. This results in an optimal grinding of the barring pattern of the soft roll. 2
  • the calender 1 is shown here with two rollers, wherein the soft roller is provided with the auxiliary drive 10.
  • the soft roller is provided with the auxiliary drive 10.
  • a metal belt calender in which additionally a band of metal or other material passes through the nip 4, one can perform the grinding operation on the soft or elastic roller 2 with the aid of the belt.
  • the described procedure can be used not only for two rolls 2, 3, as shown, but also for a multi-nip calender, in which a soft roll is provided as a center roll. If a barring pattern with an even multiple of the rotational frequency, ie the vibration frequency measured by the sensor 14, forms on the soft roller, then a high-frequency torque pulsating at a higher frequency is introduced into the roller journal 11 and thus introduced into the roller 2. If it is an even multiple in a multi-nip calender, then vibrates the elastic roller against their relatively stationary rollers. As a result, the nip of the elastic roller is loaded on one side in contact with the counter-roller, while the other nip is relieved rather, which is formed with the underlying counter-roller. This results in the sum of an even barring pattern across the roll width with the elastic roll cover.
  • the line load used in machine-wide grinding of the soft roll 2 can be reduced in comparison with the conditions of calendering.
  • the hard roll 3 is a heated roll
  • this roll 3 must be cooled to a suitable surface temperature before the soft roll 2 is ground.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (14)

  1. Procédé de fonctionnement d'une calandre comprenant au moins un pinçage, qui est limité par deux éléments formant le pinçage, dans lequel on ferme le pinçage et on met en mouvement de rotation la surface des éléments formant le pinçage, le mouvement de rotation d'un élément formant le pinçage étant superposé au moins dans le pinçage à un mouvement d'oscillation, caractérisé en ce que l'on réalise des enlèvements par le biais du mouvement d'oscillation sur au moins un élément formant le pinçage.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on produit une oscillation de couple en plus d'un couple d'entraînement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on anime l'un des éléments formant le pinçage d'une oscillation parallèlement à une direction d'avance d'une bande à travers le pinçage.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on choisit la fréquence du mouvement d'oscillation de manière à ce qu'elle soit au moins deux fois plus grande que la fréquence de rotation de l'élément formant le pinçage.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on utilise un moteur synchrone pour produire le mouvement d'oscillation.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on adapte la position de phase du mouvement d'oscillation à un modèle de formation de stries déterminé par une mesure, un mouvement relatif entre les deux éléments formant le pinçage dans la région d'un sommet d'ondulation du modèle de formation de stries étant plus important que dans la région d'un creux d'ondulation.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on utilise pour produire le mouvement d'oscillation un couple d'entraînement d'une valeur comprise dans une plage de 1 à 50% du couple d'entraînement de l'élément formant le pinçage.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on produit un mouvement d'oscillation ayant une fréquence de l'ordre de 30 Hz à 2000 Hz.
  9. Procédé selon la revendication 8, caractérisé en ce que l'on utilise une fréquence à laquelle l'élément formant le pinçage effectue encore un mouvement de corps rigide.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que l'on produit le mouvement d'oscillation avant qu'un modèle de formation de stries de l'élément formant le pinçage n'atteigne une profondeur de 5 µm.
  11. Calandre comprenant au moins un pinçage, qui est limité par deux éléments formant le pinçage, dont au moins un présente un entraînement produisant un mouvement de rotation, l'élément formant le pinçage (2) présentant un entraînement supplémentaire (10) qui peut être commandé avec une fréquence supérieure à l'entraînement (6), et produit un mouvement d'oscillation dans le pinçage (4) transversalement à la direction du pinçage, caractérisée en ce que le mouvement d'oscillation réalise un enlèvement sur au moins un élément formant le pinçage.
  12. Calandre selon la revendication 11, caractérisée en ce que l'entraînement supplémentaire (10) présente un moteur synchrone qui est connecté à un convertisseur de fréquence (12).
  13. Calandre selon la revendication 12, caractérisée en ce que le convertisseur de fréquence (12) est connecté à au moins un capteur d'oscillation (14) qui détermine une oscillation de l'élément formant le pinçage (2) et/ou dans la calandre (1).
  14. Calandre selon l'une quelconque des revendications 11 à 13, caractérisée en ce que l'entraînement supplémentaire présente un support de couple entraîné.
EP09160981A 2008-05-31 2009-05-25 Procédé de fonctionnement d'une calandre et calandre Not-in-force EP2128337B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008026344A DE102008026344A1 (de) 2008-05-31 2008-05-31 Verfahren zum Betreiben eines Kalanders und Kalander

Publications (2)

Publication Number Publication Date
EP2128337A1 EP2128337A1 (fr) 2009-12-02
EP2128337B1 true EP2128337B1 (fr) 2011-01-26

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EP09160981A Not-in-force EP2128337B1 (fr) 2008-05-31 2009-05-25 Procédé de fonctionnement d'une calandre et calandre

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EP (1) EP2128337B1 (fr)
AT (1) ATE497060T1 (fr)
DE (2) DE102008026344A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19815339A1 (de) 1998-04-06 1999-10-14 Voith Sulzer Papiermasch Gmbh Walzenmaschine und Verfahren zu ihrem Betrieb
DE19821854C1 (de) 1998-05-15 1999-07-29 Eras Entwicklung Und Realisati Vorrichtung zum aktiven Unterdrücken von Kontaktschwingungen an einer Walzenanordnung
DE10008800B4 (de) 2000-02-25 2005-10-27 Voith Paper Patent Gmbh Verfahren zum Betrieb einer Kalanderwalze und Kalanderwalze
DE10221680C1 (de) 2002-05-16 2003-10-09 Voith Paper Patent Gmbh Kalander und Verfahren zum Betreiben eines Kalanders
DE10238949B3 (de) 2002-08-24 2004-02-12 Voith Paper Patent Gmbh Verfahren zum Reinigen einer Walze in einem Kalander
DE102007022344A1 (de) 2007-05-12 2008-11-20 Aradex Ag Antriebssystem für eine Walzenanordnung einer Papiermaschine
DE102007041931A1 (de) 2007-09-04 2009-03-05 Voith Patent Gmbh Walzenanordnung

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Publication number Publication date
EP2128337A1 (fr) 2009-12-02
DE102008026344A1 (de) 2009-12-03
ATE497060T1 (de) 2011-02-15
DE502009000343D1 (de) 2011-03-10

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