EP2492394A1 - Calendre - Google Patents

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Publication number
EP2492394A1
EP2492394A1 EP12152560A EP12152560A EP2492394A1 EP 2492394 A1 EP2492394 A1 EP 2492394A1 EP 12152560 A EP12152560 A EP 12152560A EP 12152560 A EP12152560 A EP 12152560A EP 2492394 A1 EP2492394 A1 EP 2492394A1
Authority
EP
European Patent Office
Prior art keywords
nip
web
roller
calender according
calender
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.)
Withdrawn
Application number
EP12152560A
Other languages
German (de)
English (en)
Inventor
Dr. Jörg Rheims
Michael Ganasinski
Thomas Hermsen
Hans-Rolf Conrad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2492394A1 publication Critical patent/EP2492394A1/fr
Withdrawn legal-status Critical Current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
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a calender with a web running path for a running paper or board web through a first and a second, each having a first and a second circumferential contact surface having nip, wherein the web in the contact zones of each nip under pressure and / or temperature is treatable and the first contact zone of the first nip has a length in the web running direction of at least 100 mm and the second contact zone of the second nip has a length in the web running direction of at most 50 mm, wherein a first contact surface of the first nip and a first contact surface of the second nip are identical and belong to a central roller and the second contact surface of the second nip is formed by a second roller, and wherein the web running path such that the web either first through the first nip and then through the second nip or first through the second nip and then through the first nip is led.
  • the extended nip can be achieved on a roller by using an additional elastic band which partially wraps around the roller to extend the contact zone.
  • the band may be made of a plastic or a metal.
  • a short contact zone in a roll calender acts in contrast to the long contact zone in a Breitnipkalander significantly different on the web.
  • the invention has a calender to the content, at the central roller both a wide and a narrow nip are arranged.
  • Such an arrangement is for example from the DE102007024581 A1 , and in particular from Figures 1 and 3 known.
  • a metal belt partially wrapped around the roller is used.
  • the short nip is formed by a counter roll.
  • the disadvantage of the illustrated arrangement is that two longer nips are used, of which the second is to cause as little as possible heat input into the web by cooling the band forming the second contact surface of the third nip. Thus, it should not come to a so-called flash evaporation.
  • this desire can only be realized with an energy-technically unfavorably high cooling capacity on the belt.
  • a metal strip calender which, with its metal strip, forms a longer nip on a central roll.
  • a central roller opposite to the tape and a second roller at both rollers together form another nip for the web.
  • the web guide between both nips takes place on the surface of the central roller.
  • the second roll is a non-temperable roll with an elastic surface. In this constellation, an influence of the pressure of the second nip forming the shorter nip on the pressure distribution in the longer nip formed by the band is unavoidable. Conversely, even slight changes in the thickness profile of the strip and the resulting pressure pulses on the central roll impose a negative influence on the transverse pressure profile in the shorter nip.
  • a device which serves to treat a paper or board web.
  • the web passes through a roller nip and then, guided on the surface of a heating roller, a belt pressed against this heating roller by deflection rollers.
  • This tape is described as a metal or plastic fiber fabric, so it is completely unsuitable for a tape calender because of its roughness.
  • the object is achieved in that the web running path between the first and the second contact zone extends around an additional guide means.
  • the web is thus guided away from the central roll between the first nip and the second nip and wraps around a conducting means, usually a guide roll.
  • a conducting means usually a guide roll.
  • this conductive agent prevents the web from wrinkling. It is believed that a train can build up on the way from the first contact zone to the conducting means and from the conducting means to the second contact zone in the web. This formation of a web tension is accordingly prevented when the web is in contact with the central roll from the first to the second nip all the time.
  • the situation is comparable to that of a multi-roll calender, for example Applicant's Janus calender, where the web also has to be fed first from nip to nip around a guide roll.
  • the second contact surface of the first nip is formed by a circulating band.
  • a band can be made for example of a plastic or steel.
  • the invention is particularly supportive when the tape is a smooth plastic tape.
  • the band rotates in the optimal case three guide rollers and abuts over a peripheral portion of the central roller, so that a long contact zone and thus a long nip for the web is formed.
  • the length of the contact zone and the contact pressure of the band can be made changeable.
  • the tape has a maximum surface roughness Ra of 4 ⁇ m.
  • the guide means comprises a tension measuring device.
  • a tension measuring device Such Buchmess worn are known per se.
  • the Buchmess worn by suitable drive control of the central roller, second roller and band guide rollers ensure that a slack in the web is avoided.
  • the web at least over a wrapping angle of 50 °, preferably at least 70 °, on the second roller, which is designed to be tempered is applied. It creates in this way the possibility before or after the second nip and in the second nip to cool the track on one side at will or heat.
  • Common methods for heating the roll are known to the person skilled in the art and include the internal flow through with hot tempering fluids and the external heating by induction or hot air.
  • cooling methods of the roll are known which include flowing the roll through cooled fluids and blowing with cooled air.
  • the active planes of the two nips which are respectively defined by the contact zone center in the web running direction and the central axis of the central roll, are at an angle of 75 ° to 105 ° to each other.
  • the active planes are at an angle of 90 ° to one another.
  • the printing direction in a nip is then no longer important for the adjustment of the pressure cross-section in the other nip.
  • Under pressure profile is here to understand the pressure profile, which is set perpendicular to the web running direction.
  • the central roll is also tempered.
  • the possibility is created to also heat or cool the other side of the web.
  • the tempering of the web side, which rests against the central roller, can increase the Satinage intricate.
  • the second contact surface of the first nip is formed by a heatable band.
  • induction devices and blowing devices in question.
  • either the belt or the central roller can be brought to elevated temperature.
  • the band consists of a material with a thermal conductivity of less than 1 W / mK as a thermal insulator. This ensures a uniform and safe heating of the web.
  • the strip contacts the central roll at a wrap angle of more than 50 °, preferably at least 70 °, and the heat transfer to the second roll is to be as high as possible, it is favorable if the web running path is the central roll and the second roll S-shaped looped around. It remains to lay the design of the calender, the axes of the central roller and second roller in a horizontal, vertical or inclined at any other angle plane.
  • the web running path is traversable in both directions. This allows a freer selection in the paper quality to be treated.
  • paper and cardboard which preferably initially applied over a large angle of wrap on the heated second roll to be well soaked, then passed through a soft or hard nip for calibration and finally to be finished on a heated strip.
  • paper and board grades which, for example, should be smoothed on both sides in the long first nip, then compacted in a short nip and finally cooled on the second roll.
  • the calender according to the invention offers numerous possibilities for web treatment here.
  • the calender has a particular advantage if it has a humidifying device in the inlet of the web.
  • a moistened paper or board web can be satined to a higher quality.
  • the guide means has at least a quarter of the circumference of an insulating hood. Convection and radiation of the web are satisfactorily contained.
  • FIG. 1 shows a schematic representation of a calender according to the invention with a web running path from the central roll to the second roll.
  • the figure shows a calender 1 according to the invention with a central roller 11, the surface of which constitutes a peripheral contact surface 4.1, 5.1.
  • a first contact zone is formed with a further circumferential contact surface 4.2.
  • a second contact zone 7 is formed by means of the contact surface 5.2 of a second roller 12, which constitutes a second nip 5.
  • the first contact zone 6 is over 100 mm long (in the circumferential direction), the second contact zone 7 is less than 50 mm long.
  • a web travel path 3 determines the path on which a paper or board web 2 is passed through the calender 1, in particular through the contact zones 6, 7. In the contact zones 6, 7, the web 2 is subjected to pressure and / or temperature.
  • the second contact surface 4.2 is predetermined by the surface of a circulating belt 13, preferably a plastic belt with a surface roughness Ra of less than 4 ⁇ m.
  • the system pressure in this first long nip is usually between 0.05 and 5 N / mm 2 .
  • the belt is guided over belt guide rollers 14. These have an adjusting device (indicated at two band guide rollers by the arrow with the reference numeral 20). Depending on which of the belt guide rollers 14 have such an adjustment device 20, the contact zone length can be changed via this and the contact pressure of the metal strip 13 on the central roller 11 can be determined.
  • the band can also be isolating. It is also advantageous if the band has a hardness as conventional plastic-based counter-rollers in calenders.
  • the second roller 12 can supply or dissipate heat energy; So it is designed to be tempered.
  • the roller 12 can be tempered from the inside via a heat transfer fluid.
  • a heat transfer fluid For the treatment of the web, many possibilities of influence remain here because the web 2 wraps around the second roller at least 50 °, preferably at least 70 °. Over such a large peripheral portion of the web can be added or removed a lot of heat.
  • the wrap angle is indicated by the arrow 16.
  • the web is guided away in its web running path from the central roller and wraps around a guide means 15 in the form of a guide roller.
  • a guide means 15 in the form of a guide roller.
  • the train is able to build a train and stay taut.
  • the guide roller 15 is covered on a part of its circumference by an insulating cover 22.
  • the second nip 5 could become a soft nip when the second roll has an elastic coating 17.
  • the roller 12 it is also possible to provide the roller 12 with a coating 17 which conducts heat particularly well. It is advantageous if the compressive stress in the second nip 5 is significantly higher than that in the first nip 4, particularly preferably in the range of 3 to 30 N / mm 2 .
  • the angle 21 between the two active planes is not less than 75 ° and not greater than 105 °. Preferably, it is understandably 90 °.
  • the web running direction 10 is indicated in FIG.
  • the web first passes through the long first contact zone 6, then through the short second contact zone 7 and then abuts the second roller 12 in an overall S-shaped web running path 3.
  • the web direction can also be exactly the other way around.
  • the web 2 is then first, again S-shaped, in contact with the brought second roller 12, then passes through the short second contact zone 7 and is finally finished in a long first contact zone 6.
  • an air squeezing device provided in a manner not shown, which ensures that no air boundary layer between web 2 and the surface of the second roller 12 is drawn in, can be very advantageous in order to increase the heat transfer value between web 2 and roller 12 ,
  • the driving style is heavily dependent on the paper or board type.

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  • Paper (AREA)
EP12152560A 2011-02-25 2012-01-26 Calendre Withdrawn EP2492394A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110004730 DE102011004730A1 (de) 2011-02-25 2011-02-25 Kalander

Publications (1)

Publication Number Publication Date
EP2492394A1 true EP2492394A1 (fr) 2012-08-29

Family

ID=45509388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12152560A Withdrawn EP2492394A1 (fr) 2011-02-25 2012-01-26 Calendre

Country Status (2)

Country Link
EP (1) EP2492394A1 (fr)
DE (1) DE102011004730A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141614A2 (fr) 1983-10-24 1985-05-15 Black-Clawson International Limited Traitement de surface du papier et du carton
WO2001061107A1 (fr) * 2000-02-16 2001-08-23 Metso Paper, Inc. Procede de calandrage de papier et dispositif correspondant comprenant un rouleau chauffable
WO2003064762A1 (fr) * 2002-01-29 2003-08-07 Metso Paper, Inc. Dispositif de traitement et procede d'exploitation du dispositif pour traiter une bande fibreuse couchee ou non couchee
WO2008049973A2 (fr) * 2006-10-25 2008-05-02 Metso Paper, Inc. Calandre multi-rouleaux en ligne et méthode de calandrage d'une bande fibreuse sur une calandre multi-rouleaux en ligne.
DE102007024581A1 (de) 2007-05-25 2008-11-27 Voith Patent Gmbh Kalander und Verfahren zur Satinage von Papier- oder Kartonbahnen
WO2009077643A1 (fr) 2007-12-17 2009-06-25 Metso Paper, Inc. Calandre à bande métallique
EP2270280A1 (fr) * 2009-06-30 2011-01-05 Andritz Küsters GmbH Calandre destinée au traitement d'une bande de matériau

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0141614A2 (fr) 1983-10-24 1985-05-15 Black-Clawson International Limited Traitement de surface du papier et du carton
WO2001061107A1 (fr) * 2000-02-16 2001-08-23 Metso Paper, Inc. Procede de calandrage de papier et dispositif correspondant comprenant un rouleau chauffable
WO2003064762A1 (fr) * 2002-01-29 2003-08-07 Metso Paper, Inc. Dispositif de traitement et procede d'exploitation du dispositif pour traiter une bande fibreuse couchee ou non couchee
WO2008049973A2 (fr) * 2006-10-25 2008-05-02 Metso Paper, Inc. Calandre multi-rouleaux en ligne et méthode de calandrage d'une bande fibreuse sur une calandre multi-rouleaux en ligne.
DE102007024581A1 (de) 2007-05-25 2008-11-27 Voith Patent Gmbh Kalander und Verfahren zur Satinage von Papier- oder Kartonbahnen
WO2009077643A1 (fr) 2007-12-17 2009-06-25 Metso Paper, Inc. Calandre à bande métallique
EP2270280A1 (fr) * 2009-06-30 2011-01-05 Andritz Küsters GmbH Calandre destinée au traitement d'une bande de matériau
WO2011000529A1 (fr) 2009-06-30 2011-01-06 Andritz Küsters GmbH & Co. KG Calandre servant au traitement d’un produit en bande

Also Published As

Publication number Publication date
DE102011004730A1 (de) 2012-08-30

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