EP2189570A1 - Procédé et dispositif de traitement de papiers bruts de séparation et papier brut de séparation - Google Patents

Procédé et dispositif de traitement de papiers bruts de séparation et papier brut de séparation Download PDF

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Publication number
EP2189570A1
EP2189570A1 EP09169239A EP09169239A EP2189570A1 EP 2189570 A1 EP2189570 A1 EP 2189570A1 EP 09169239 A EP09169239 A EP 09169239A EP 09169239 A EP09169239 A EP 09169239A EP 2189570 A1 EP2189570 A1 EP 2189570A1
Authority
EP
European Patent Office
Prior art keywords
web
cylinder
nip
heated cylinder
drying
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Withdrawn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
EP09169239A
Other languages
German (de)
English (en)
Inventor
Hans-Peter Marleaux
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 EP2189570A1 publication Critical patent/EP2189570A1/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Withdrawn legal-status Critical Current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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • 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
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06—Vegetable or imitation parchment; Glassine paper

Definitions

  • the invention relates to a method for refining separation base paper, wherein a web with 10 to 20% inlet moisture content in at least one nip compressed and smoothed, dried in the further course, possibly cooled and finally wound up.
  • the invention further relates to a device for refining separation base papers in particular according to one of the method claims, which includes a web running path through a Mehrwalzenkalander and a drying device. Finally, the invention relates to a release paper.
  • release base papers such as silicone base paper, glassine or Kraft papers are now performed at high humidity and under high pressure by a multi-rolling calender, then dried in an air dryer and finally cooled before winding.
  • the multi-roll calender has in most cases at least 11 rolls and no alternating nip (in which two elastic rolls abut each other), so that substantially only one side of the sheet is smoothed.
  • a method and a device for refining separation base papers for example, from the DE 3427967 A1 out.
  • the invention has set itself the goal of eliminating at least some of the above-mentioned disadvantages of existing methods and devices for refining release base papers.
  • the object is achieved with respect to the method in that the web is dried after the at least one nip by contact with at least one heated cylinder.
  • the drying device comprises a heated cylinder and Bruleitsch, wherein the Bruleitsch are aligned such that the web comes in its web running path for engagement with the coating cylinder.
  • the solutions are based on the fact that the drying device used assumes part of the tasks of the multi-roll calender, such as, for example, a smoothing increase.
  • a part of the air dryer is replaced after the calender by a heated dry cylinder with a smooth surface on the surface of the web both dried and provided with the desired properties in terms of smoothness, transparency, etc.
  • the use of such a drying cylinder means that either one part of the highly heated calender rolls can be dispensed with in new plants to save heating and energy, or on the other hand can increase the web speed and thus production in conversions of existing plants.
  • the web is pressed during drying by means of a pressing device over a wrap angle greater than 120 ° to the heated cylinder. If the web is laid to such an extent (taking into account that the usual cylinder diameters are 2 to 5 m), a great influence is exerted on the smoothness development. The usually relatively large smoothness losses in an air drying can be substantially avoided. In some cases even an increase in smoothness in the drying compared to the smoothness value (in sec Bekk) after the calender was recorded.
  • the web preferably runs at a speed above 800 m / min, preferably above 1000 m / min.
  • the high speed compared to the prior art, the values of which resulted from the limited drying capability in the calender and in the air dryer, makes it possible to increase the production output.
  • the web is subjected to a line load of more than 300 N / m in at least one nip.
  • This line load compacts the web to an extent that is sufficient for high quality release base papers.
  • the multi-roll calender advantageously has less than 10 rolls. This is a significant advance over the prior art in which release base papers having at least 11 rollers were smoothed. It can be saved in such Mehrwalzenkalander significant energy and production costs.
  • a multi-roll calender should also be understood to mean those calenders which are not constructed as a single stack. The multi-roll calender may well have multiple stacks of rolls.
  • At least one nip in the multi-roll calender is suitable for applying a line load of more than 300 N / mm. In any case, you have a nip in the calender that can compact the web to a necessary degree.
  • a pressing means is present, which can press the web over a wrap angle greater than 120 ° to the heated cylinder. In this way, a high heat transfer to the drying of the web is realized. An insulating air boundary layer is largely prevented. The exposure time of the surface temperature of the cylinder to the web is so long that a large amount of heat can be dissipated into the web surface. In addition, an additional calendering performance can be applied by the pressing of the pressing. A contact pressure between 0.5 and 5 bar has been found to be advantageous.
  • the pressing means is formed by a circulating belt.
  • the belt like the train itself, can be guided by conductive means, but in a closed circuit, unlike the web.
  • a long section rests on a circumferential section of the cylinder on the track.
  • the band may be closed and smooth or porous in order to retain the forming water vapor in the paper web for increased smoothness or to allow more to escape for drying.
  • the circulating belt is made of metal and in particular if the heated cylinder and / or the belt has a surface roughness Ra of less than 0.1 ⁇ m.
  • Such a smooth band as well as such a smooth cylinder surface contributes enormously to the smoothness increase.
  • the figure shows a schematic representation of a device for refining a Trennrohpapiers.
  • the finishing device follows in this embodiment online directly the paper machine, which is provided only symbolically in its entirety by the reference numeral 2.
  • the web 8 emerging from the paper machine or a rehydration with a moisture content of between 10 and 20% passes through the entire apparatus for finishing a release base paper 1 on a web running path 15 predetermined by web guiding means 14 and is first fed to a multiroll calender 3.
  • the Mehrwalzenkalander 3 has alternately heated rollers 9 and elastic rollers 10 and no interchangeable gap with two elastic rollers. So only one side of the very smooth heated rollers 9 and is there smoothed. In at least one calender nip there is a line load of at least 300 N / mm to sufficiently compact the web to a density greater than one.
  • a drying device 4 which comprises a rotating heatable cylinder 7, with which the web 8 over a peripheral portion which should be greater than 120 ° in contact.
  • the web side which was previously smoothened higher in the multiroll calender 3, also abuts against the cylinder surface.
  • release papers it is usually important to ensure that a web page is particularly smooth.
  • the smoothness of this web page is reinforced by the system on the cylinder 7, whose surfaces should also be very smooth (if possible below a Ra value of 0.1 microns), reinforced again. At the very least, the web will not be roughened substantially, as would be the case with an air dryer.
  • both sides of the web have a certain degree of smoothness, it is also possible to ensure that the side of the web which did not come into contact with the hot rolls in the multi-roll calender 3 rests against the cylinder surface in the drying device 4.
  • a second drying device can be followed, in which the other side of the web rests against the cylinder surface.
  • a pressing device 11 in the form of a circumferential band 12 is provided.
  • This belt 12 can be guided and tensioned over belt guide rollers 13, so that it exerts pressure on the web 8 resting against the surface of the cylinder 8.
  • further force transmitter pressure rollers, pressure boxes or the like act from the outside on the tape to increase the contact pressure.
  • the circumferential band 12 is preferably made of plastic or metal. Again, a high smoothness of the tape in the order of less than an Ra value of 0.1 is very advantageous because even on the web side, on which the tape is applied, no deterioration of the smoothness is allowed.
  • the band 12 may also be different tempered, in particular cooled, than the heated cylinder 7. This favors the escape of steam from the web 8.
  • the operator of the device for refining a release base paper 1 has several opportunities to improve its business performance.
  • the purchase price is reduced because fewer rolls are needed in the multi-roll calender than before. As a rule, then less than 10 rolls are necessary.
  • the production speed can be significantly increased. Web speeds above 800 m / min are easy to handle, but it can be achieved with the inventive design and web speeds higher 1000 m / min.
  • refined release base papers can be produced which have a smoothness of more than 2300 seconds (Bekk) and / or a transparency of 40 to 55% (DIN 53147).

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  • Paper (AREA)
EP09169239A 2008-11-19 2009-09-02 Procédé et dispositif de traitement de papiers bruts de séparation et papier brut de séparation Withdrawn EP2189570A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810043867 DE102008043867A1 (de) 2008-11-19 2008-11-19 Verfahren und Vorrichtung zu Behandlung von Trennrohpapieren und Trennrohrpapier

Publications (1)

Publication Number Publication Date
EP2189570A1 true EP2189570A1 (fr) 2010-05-26

Family

ID=42035648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09169239A Withdrawn EP2189570A1 (fr) 2008-11-19 2009-09-02 Procédé et dispositif de traitement de papiers bruts de séparation et papier brut de séparation

Country Status (2)

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EP (1) EP2189570A1 (fr)
DE (1) DE102008043867A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876205A1 (fr) * 2013-11-21 2015-05-27 Valmet Technologies, Inc. Procédé de calandrage d'une bande de matière fibreuse et calandre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3427967A1 (de) 1984-07-28 1986-02-06 Kämmerer GmbH, 4500 Osnabrück Verfahren zum veredeln von papier und vorrichtung zur durchfuehrung des verfahrens
EP0402513A1 (fr) * 1989-06-16 1990-12-19 Kämmerer Gmbh Procédé de préparation de papier trés comprimé, contenant des fibres synthétiques, de masse volumique supérieure ou égale à 0,84 kg/dm3
WO2000003088A1 (fr) * 1998-07-10 2000-01-20 Valmet Corporation Procede et appareil de fabrication de papier calandre
US20020060022A1 (en) * 2000-02-25 2002-05-23 Bauer Donald G. Method for smoothening a paper web before coating
WO2003100167A1 (fr) * 2002-05-29 2003-12-04 Upm-Kymmene Corporation Papier de base destine au papier antiadhesif et procede de fabrication correspondant
DE102004017808A1 (de) * 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Maschine und Verfahren zur Herstellung einer Faserstoffbahn

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3427967A1 (de) 1984-07-28 1986-02-06 Kämmerer GmbH, 4500 Osnabrück Verfahren zum veredeln von papier und vorrichtung zur durchfuehrung des verfahrens
EP0402513A1 (fr) * 1989-06-16 1990-12-19 Kämmerer Gmbh Procédé de préparation de papier trés comprimé, contenant des fibres synthétiques, de masse volumique supérieure ou égale à 0,84 kg/dm3
WO2000003088A1 (fr) * 1998-07-10 2000-01-20 Valmet Corporation Procede et appareil de fabrication de papier calandre
US20020060022A1 (en) * 2000-02-25 2002-05-23 Bauer Donald G. Method for smoothening a paper web before coating
WO2003100167A1 (fr) * 2002-05-29 2003-12-04 Upm-Kymmene Corporation Papier de base destine au papier antiadhesif et procede de fabrication correspondant
DE102004017808A1 (de) * 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Maschine und Verfahren zur Herstellung einer Faserstoffbahn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876205A1 (fr) * 2013-11-21 2015-05-27 Valmet Technologies, Inc. Procédé de calandrage d'une bande de matière fibreuse et calandre

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