EP2022892A2 - Bloc doté d'une calendre et d'un dispositif de séchage - Google Patents

Bloc doté d'une calendre et d'un dispositif de séchage Download PDF

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Publication number
EP2022892A2
EP2022892A2 EP08160375A EP08160375A EP2022892A2 EP 2022892 A2 EP2022892 A2 EP 2022892A2 EP 08160375 A EP08160375 A EP 08160375A EP 08160375 A EP08160375 A EP 08160375A EP 2022892 A2 EP2022892 A2 EP 2022892A2
Authority
EP
European Patent Office
Prior art keywords
calender
web
drying
assembly according
rollers
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Withdrawn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
EP08160375A
Other languages
German (de)
English (en)
Other versions
EP2022892A3 (fr
Inventor
Thomas Hermsen
Uwe Matuschczyk
Jörg Dr. Rheims
Ulrich Rothfuss
Eugen Schnyder
Peter Dr. Wiemer
Lothar Dr. Zimmermann
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 EP2022892A2 publication Critical patent/EP2022892A2/fr
Publication of EP2022892A3 publication Critical patent/EP2022892A3/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Withdrawn legal-status Critical Current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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper

Definitions

  • the invention relates to an assembly, in particular an assembly for paper machines, which has a drying device, a calender device and at least one belt device for at least one-sided contact with a material web.
  • rollers carry out different tasks.
  • several rollers are combined to form an assembly of the production line, in which a certain processing task is performed.
  • the rollers or the roller group can perform the respective task, they are designed accordingly (eg as a solid roller, as a hollow cylinder roller etc.), arranged correspondingly (eg in combination with a second roller, so that the two rollers together form a nip), or provided with corresponding additional equipment (eg heatable rollers, moistening devices, etc.).
  • a dryer assembly is provided which, in addition to other rolls and devices, has in particular a plurality of heatable drying rolls.
  • an endless, circulating belt is still provided that supports the still moist, unstable base paper web. Most of the raw paper web is supported from both sides by a circumferential support band.
  • calendering devices To subsequently densify and smooth the web, calendering devices are used. Calender devices exist in different designs. In the classic design two rolls are arranged directly next to each other, such that they together form a nip. To adequately smooth a paper web, a single calender nip is generally insufficient. Therefore, it is necessary to provide a plurality of calenders. To save space and costs, multinip calenders (also known as supercalenders or Janus calenders) are used). These have a plurality of superposed rollers, of which two together form a nip for the material web to be processed.
  • Breitnipkalander Since not only the number of nips has an influence on the processing result, but in particular the residence time of the processed Material web in the nip has an influence on the processing result, are also used in the meantime, so-called Breitnipkalander.
  • One possible design is that adjacent to a steel roller an elastically deformable roller is assigned. In the contact area of the two rollers, the elastically deformable roller is pressed concavely by the steel roller. This creates a nip with an increased processing length, in other words a nip.
  • At least two band devices in particular two common band devices are provided, which are provided for two-sided contact with the material web.
  • the material web to be processed can be characterized by the band devices from both sides be included. As a result, the material web to be processed is not exposed at the times when it is enclosed by the belt devices from both sides. The material web can be protected and processed very gently.
  • the proposed development makes sense if it is a very thin, very filigree and / or very tear-sensitive material web. The same applies analogously to a precursor of the material web, for example if the precursor of the material web is particularly susceptible to cracking.
  • At least one common band device is permeable and in particular has a felt web. Especially in the field of drying device, it can lead to evaporation of a significant amount of water. The resulting water vapor must naturally be able to escape. In this case, a permeable belt device proves to be advantageous. If the band device is furthermore designed as a felt web, then it can be fully filled with water and thus support the drying process of the material web.
  • At least one common band device has a metal band.
  • a metal strip is just for use in the calender area of the assembly advantageous because it can transmit high contact pressures.
  • process heat can be supplied or removed particularly well via a metal strip.
  • it is particularly to think of composite tapes.
  • At least one common band device is at least partially heated by the drying device.
  • the heating of the belt device which is anyway required in the drying device can be used to determine the calendering result in the To improve calendering of the assembly, because the processing result of the calender can be improved not only by broadening the nip, but also by heating the calender or the material to be processed web in the nip area (the so-called conditioning of the web).
  • the proposed leadership of the common band device heat energy can be saved, since here the "residual heat" of the dryer area can be used advantageously.
  • At least one common belt device is at least partially heated by an additional heater. If appropriate, the heat energy originating from the dryer group is insufficient, so that reheating can take place by the proposed additional heater. Nevertheless, energy can be saved since at least the initial heating can be "saved".
  • At least one common belt device passes through at least one wet area of the drying device.
  • the residual moisture remaining in the belt device or in connection with the belt device in the material web can advantageously be used for conditioning the material web to be calendered.
  • the processing result in the calendering device can thereby be further improved.
  • a hitherto partially customary separate moisture conditioning can be omitted, or at least made easier.
  • rollers of the calendering device are at least partially formed as elastic rollers, in particular as Breitnipwalzen. This can also the processing result of improve in the calender to be processed web.
  • the common belt device it is also possible to be more flexible in the material selection of one or more calender rolls. Particularly advantageously, a wide nip with a residual moisture and / or a residual heat conditioning can be combined.
  • a roll assembly 1 of a paper machine which has a calendering section 2 and a drying section 3 as an integrated unit.
  • a plurality of heated drying cylinders 4 is provided, over which the paper web 5 to be processed is guided.
  • the drying cylinders 4 are associated with a plurality of guide rollers 6.
  • the guide rollers 6, in combination with the drying rollers 4, pass the paper web 5 through the dryer section 3.
  • the paper web 5 is surrounded by two thin metal bands 7. How out Fig. 1 As can be seen, a direct contact between the paper web 5 and the corresponding roll surfaces 4, 6 is prevented in a plurality of the drying rollers 4 and guide rollers 6.
  • Fig. 1 can be removed, however, the removal of the metal strips 7 of the paper web is only temporary. In other words, at the end of the transition region 9 in the calendering region 2, the metal strips 7 again contact the paper web 5. This will be explained in more detail below.
  • the dryer section 3 - based on Fig. 1 - can extend further to the right. In such an area further drying rollers and other circulating endless belts may be provided. In particular, the endless belts provided there may at least partially be present as a felt web.
  • the paper web 5 After leaving the end region 8 of the dryer section 3, the paper web 5 enters a calendering section 2. From the calendering section 2, in the present case only a single calender roller pair 11 is shown. Of course, it is possible for the calender roller pair 11 to be followed by further calenders, or for the calender roller pair 11 also to be designed as a multinip calender and / or a broad nip calender.
  • the process heat introduced by the heated drying rollers 4 into the paper web 5 via the metal strips 7 can be used advantageously as conditioning heat for the calender -walzencru 11 of the calender 2 are used.
  • the metal bands 7 retain their heat when passing through the transition region 9 between the dry party 3 and the calendering section 2 at.
  • the distance to be bridged is only a few meters, so that at today's machine speeds of 300 m / min to 1000 m / min and more, the heat losses occurring are only minimal.
  • additional heaters 10 are provided in the transitional region 9 between the dryer section 3 and calender section 2, which reheat the metal strip 7, if this should prove necessary.
  • the additional heaters 10 can heat the respective metal strip 7 by applying an eddy current field, for example.
  • the strength of the reheating can be done for example by a corresponding control of the additional heaters 10. This task can take over the usually already existing control of the paper machine.
  • the paper web 5 Due to the free guidance of the paper web 5 in the transition area 9 excessive moisture can be discharged from the paper web 5 to the environment. On the other hand, since the transition area 9 is not selected to be too large, the paper web 5 does not excessively dry out. The residual moisture remaining in the paper web 5 also serves to condition the paper web 5, so that the processing result in the nip 12 of the calender roll pair 11 improved again.
  • a Breitnipkalander 14 and a separately trained dryer section 15 can be seen.
  • the paper web 17 is transferred in the space exposed from the dryer section 15 to the Breitnipkalander 14. Since the heat capacity of the paper web 17 is insufficient for a sufficient conditioning temperature to prevail in the extended nip calender 14, the nip calender 14 must have a separate heating device. This is usually done by one of the two calender rolls 16 of the Breitnipkalanders 15 (or both) are designed to be heated.

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  • Paper (AREA)
EP08160375.5A 2007-07-21 2008-07-15 Bloc doté d'une calendre et d'un dispositif de séchage Withdrawn EP2022892A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710034098 DE102007034098A1 (de) 2007-07-21 2007-07-21 Baugruppe mit Kalander und Trockenvorrichtung

Publications (2)

Publication Number Publication Date
EP2022892A2 true EP2022892A2 (fr) 2009-02-11
EP2022892A3 EP2022892A3 (fr) 2013-10-23

Family

ID=39865117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08160375.5A Withdrawn EP2022892A3 (fr) 2007-07-21 2008-07-15 Bloc doté d'une calendre et d'un dispositif de séchage

Country Status (2)

Country Link
EP (1) EP2022892A3 (fr)
DE (1) DE102007034098A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2549013A1 (fr) * 2011-07-21 2013-01-23 Metso Paper, Inc. Procédé et agencement pour produire une bande de materiau fibreux

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044196A1 (fr) * 1997-04-02 1998-10-08 Valmet Corporation Procede de calandrage et calandre utilisant ledit procede
WO1999014427A1 (fr) * 1997-09-18 1999-03-25 Valmet Corporation Procede et appareil a l'extremite de la partie seche d'une machine a papier
WO2002048452A2 (fr) * 2000-12-14 2002-06-20 Kimberly-Clark Worldwide, Inc. Procede de calandrage d'une feuille de tissu sechee a coeur non crepee
EP1840260A2 (fr) * 2006-04-01 2007-10-03 Voith Patent GmbH Dispositif de fabrication et traitement d'une bande de matière fibreuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998044196A1 (fr) * 1997-04-02 1998-10-08 Valmet Corporation Procede de calandrage et calandre utilisant ledit procede
WO1999014427A1 (fr) * 1997-09-18 1999-03-25 Valmet Corporation Procede et appareil a l'extremite de la partie seche d'une machine a papier
WO2002048452A2 (fr) * 2000-12-14 2002-06-20 Kimberly-Clark Worldwide, Inc. Procede de calandrage d'une feuille de tissu sechee a coeur non crepee
EP1840260A2 (fr) * 2006-04-01 2007-10-03 Voith Patent GmbH Dispositif de fabrication et traitement d'une bande de matière fibreuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2549013A1 (fr) * 2011-07-21 2013-01-23 Metso Paper, Inc. Procédé et agencement pour produire une bande de materiau fibreux

Also Published As

Publication number Publication date
DE102007034098A1 (de) 2009-01-22
EP2022892A3 (fr) 2013-10-23

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