EP2295632A1 - Calendre - Google Patents

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Publication number
EP2295632A1
EP2295632A1 EP10166646A EP10166646A EP2295632A1 EP 2295632 A1 EP2295632 A1 EP 2295632A1 EP 10166646 A EP10166646 A EP 10166646A EP 10166646 A EP10166646 A EP 10166646A EP 2295632 A1 EP2295632 A1 EP 2295632A1
Authority
EP
European Patent Office
Prior art keywords
web
nip
roller
calender
central
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.)
Granted
Application number
EP10166646A
Other languages
German (de)
English (en)
Other versions
EP2295632B1 (fr
Inventor
Axel Hißen
Dr. Jörg Rheims
Günter HALMSCHLAGER
Jean Y. Nouaze
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 EP2295632A1 publication Critical patent/EP2295632A1/fr
Application granted granted Critical
Publication of EP2295632B1 publication Critical patent/EP2295632B1/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
    • 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
    • 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

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 surfaces 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 and a first contact surface of the second nip are identical and closed a central roller and the second contact surface of the second nip is formed by a second roller.
  • 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 here in particular from the FIGS. 1 and 3 known.
  • To produce the longer nip 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.
  • the second roll is a non-temperable roll with an elastic surface.
  • an influence of the pressure of the second nip forming the shorter nid on the pressure distribution in the longer nip formed by the band is unavoidable.
  • 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.
  • the task is fulfilled by the combination of two characteristics.
  • First - the first characteristic - runs the web running path such that the web at least over a wrapping angle of 50 °, preferably at least 70 °, on the second roller, which is designed to be tempered. 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 second characteristic provides that the planes of action 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. Thus, almost any influence of a pressure change in the first or second nip on the other can be excluded.
  • 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 circulating band.
  • a band may for example be made of a plastic or steel. It rotates in the simplest 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 second contact surface of the first nip is formed by a heatable metal strip.
  • a metal strip is significantly easier tempered than a typically provided with low thermal conductivity and also insulating plastic tape.
  • induction devices and blowing devices in question.
  • either the metal strip or the central roll can be brought to elevated temperature.
  • the first case consider whether to provide the central roller with an elastic coating, so that the second nip is a soft nip. This improves the uniform compaction of the web.
  • the web running path can be designed so that the central roller is arranged in the web running direction in front of or behind the second roller.
  • the expert has to decide case by case, depending on which paper or cardboard type is to be satined.
  • the strip touches 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, then it is favorable if the web running path fits the central roll and the second roll is S-shaped wraps. 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 abut 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 metal strip.
  • paper and board grades which 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 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.
  • Both figures show a calender 1 according to the invention with a central roll 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 circumferential metal strip 13 according to the embodiment. Instead, however, it is also possible to use plastic strips or a shoe roll likewise known in the prior art, since they too can produce a contact zone length of more than 100 mm.
  • the system pressure in this first long nip is usually between 0.05 and 5 N / mm 2 .
  • the metal strip is guided over band 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 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 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 10 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 °.
  • FIG. 1 The big difference between the two FIGS. 1 and 2 lies in the web running direction 10.
  • FIG. 1 The web runs first through the long first contact zone 6, then through the short second contact zone 7 and then is still in a total S-shaped web running path 3 on the second roller 12 at.
  • FIG. 2 the same calender 1 is used. However, web 2 is first brought into contact with second roller 12 via web deflection rollers 15, again S-shaped, then passes through 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)
EP20100166646 2009-08-25 2010-06-21 Calendre Not-in-force EP2295632B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910028857 DE102009028857A1 (de) 2009-08-25 2009-08-25 Kalander

Publications (2)

Publication Number Publication Date
EP2295632A1 true EP2295632A1 (fr) 2011-03-16
EP2295632B1 EP2295632B1 (fr) 2012-06-20

Family

ID=43502960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100166646 Not-in-force EP2295632B1 (fr) 2009-08-25 2010-06-21 Calendre

Country Status (3)

Country Link
EP (1) EP2295632B1 (fr)
CN (1) CN201924229U (fr)
DE (1) DE102009028857A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012209736A1 (de) 2012-06-11 2013-12-12 Voith Patent Gmbh Kalander

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011077969A1 (de) 2011-06-22 2012-12-27 Voith Patent Gmbh Vorrichtung zur Temperierung einer Faserstoffbahn
DE102011081228A1 (de) 2011-08-19 2013-02-21 Voith Patent Gmbh Verfahren zur Erkennung des Zustandes eines Bandes und Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn

Citations (3)

* 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
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

Patent Citations (3)

* 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
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012209736A1 (de) 2012-06-11 2013-12-12 Voith Patent Gmbh Kalander
WO2013186135A1 (fr) 2012-06-11 2013-12-19 Voith Patent Gmbh Calandre

Also Published As

Publication number Publication date
DE102009028857A1 (de) 2011-03-03
CN201924229U (zh) 2011-08-10
EP2295632B1 (fr) 2012-06-20

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