EP1541758B1 - Procédé de traitement d'une bande de papier - Google Patents

Procédé de traitement d'une bande de papier Download PDF

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Publication number
EP1541758B1
EP1541758B1 EP20040105856 EP04105856A EP1541758B1 EP 1541758 B1 EP1541758 B1 EP 1541758B1 EP 20040105856 EP20040105856 EP 20040105856 EP 04105856 A EP04105856 A EP 04105856A EP 1541758 B1 EP1541758 B1 EP 1541758B1
Authority
EP
European Patent Office
Prior art keywords
moisture
paper web
calender
web
paper
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.)
Revoked
Application number
EP20040105856
Other languages
German (de)
English (en)
Other versions
EP1541758A1 (fr
Inventor
Ingolf Cedra
Holger Humberg
Joachim Hinz
Rüdiger KURTZ
Jörg Rheims
Udo Gabbusch
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
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1541758A1 publication Critical patent/EP1541758A1/fr
Application granted granted Critical
Publication of EP1541758B1 publication Critical patent/EP1541758B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a method for treating a paper web, in which the paper web is dried and passed through a calender.
  • the invention relates to the treatment of SC paper in the off-line process.
  • the paper web is overdried, i. it is dried down to a moisture content in the order of 2 to 4% in or after the drying section. This would eliminate moisture nests that have formed despite drying in the dryer section in the paper web. Although these moisture nests have only an order of a few square centimeters, i. Expansions in the range of 1 to 5 cm. Here moisture remains in or between the fibers of the paper web. In addition to the "stains" with high moisture content, there are areas with low moisture content. Particularly detrimental affect these moisture stains in connection with a calendering of the paper web in the calender, in which after the action of higher pressures and temperatures, a so-called "cockling" can occur.
  • the paper web is overdried. Over-drying means that the paper web is so dry that it can no longer be satisfactorily calendered in a calender. To make the calendering possible, the paper web becomes then rewetted to the humidity of 7 to 12% required for off-line calendering. This rewetting is done so far in the paper machine after the dryer section and before winding.
  • the EP-A-1335066 discloses a method and an apparatus for producing and treating a web, in particular a paper or board web.
  • the material web is guided at the end of a paper machine through a drying section and then wound up in a winding device. Between the dryer section and the winding device, a first moisture is provided, through which the material web can be moistened before winding.
  • a scanner is arranged in each case, which serves to determine the moisture content of the material web.
  • the material web should be moistened before winding at most to a critical with respect to the winding moisture.
  • the moisture content of the web at the end of the dryer section is usually in the range of 2.5%. Therefore, the material web is moistened until it has a moisture content of up to 10%.
  • the web of material may have higher moisture after leaving the dryer section.
  • the material web may have a moisture content in the range between 6% and 10%. After winding the web, storage takes place. In this case, there is a maturation of the material web, which is required for achieving the desired quality.
  • the invention is based on the object with little effort to achieve a satisfactory result in the treatment in the calender.
  • This object is achieved in a method of the type mentioned in that dries the paper web to a moisture content of at least 7%, wound, stored in the wound state for at least 20 minutes, unwinds and then passes through the calender, wherein a cross-profile control of Moisture by at least one zone-controlled drying element performs.
  • the paper web is no longer overdried. It is dried to a humidity at which the paper web can still be satined. The remaining moisture can be eliminated by a combination of two measures.
  • a cross-sectional regulation of the moisture is carried out.
  • the paper web is allowed to rest in the wound state for a predetermined rest period, so that a compensation between adjacent regions of the wound-up paper web can take place. The compensation can be done in all directions.
  • This intermediate storage takes place on the spool in the time from winding to off-line calendering. Both measures together result in a paper web whose cross profile of Moisture is even enough for a satisfactory quality.
  • the regulation of the transverse profile of the moisture is carried out by means of at least one zone-controlled drying element.
  • a zone-controlled drying element can be realized for example by an infrared dryer, which is divided transversely to the direction of the paper web into individual sections, which can be controlled individually.
  • the paper web is passed through the calender without rewetting. If the cross-section of the moisture can already be sufficiently leveled by the zone-controlled drying elements, then the remoistening is unnecessary, which can lead to a further energy saving.
  • the transverse profile control of the moisture is at least partially performed prior to winding.
  • the paper web thus has a relatively uniform moisture already in the wound state.
  • the above-mentioned moisture nests are still not eliminated. But it creates a condition that the moisture from these moisture nests can spread relatively quickly and uniformly, so that after the predetermined rest period receives a paper web with a sufficiently uniformed moisture profile.
  • the moisture content of the paper web is preferably increased by 1 to 5 percentage points, and the moisture profile is controlled in this case.
  • the moisture profile is controlled in this case.
  • the moisture is increased by means of a gas-pressure-operated nozzle applicator.
  • a gas-pressure-operated nozzle applicator which can also be referred to as a nozzle humidifier
  • the liquid used for the moist usually water, ejected through nozzles and thereby atomized.
  • a compressed gas For "drive” you can use a compressed gas.
  • the compressed gas has two tasks. It leads, on the one hand, to the fact that the liquid is atomized on leaving the nozzle. On the other hand, the gas helps to transport the liquid onto the surface of the paper web.
  • steam is used as the drive gas for the nozzle applicator.
  • Steam usually water vapor, has several advantages. Firstly, the liquid is slightly heated during atomization, so that it can be easily absorbed by the paper web. The higher the temperature of the liquid, the easier the fibers of the paper web will absorb the moisture. On the other hand, the liquid contained in the vapor at the latest when it condenses on or in the paper web, leading to an increase in the Humidity. In addition, the web is simultaneously supplied with thermal energy, which further improves the calendering result based on the "Temperature / Moisture Gradient Method".
  • air may be used as the drive gas for the nozzle applicator. This procedure is advantageous for reasons of cost, among other things.
  • the application of moisture after unwinding has the advantage that the moisture can wet only the surface areas of the paper web until the time when the paper web passes through the first nip of the calender. Thus, there is no complete moisture penetration of the paper web. The result is a moisture gradient. The center of the paper web (in the z-direction) remains drier so that the paper web in the calender is not compressed as much as in the state of complete moisture penetration. You can thus achieve a volume-smoothing.
  • the time that elapses between the wet application after unwinding and passing through the first nip of the calender should be in the range of 0.1 to 1 s, in particular in the range of 0.3 to 0.6 s. These times are sufficient to wet the surfaces of the paper web to the extent that on the one hand a sufficiently uniform moisture profile is achieved, on the other hand the calendering in the calender can be achieved with the desired smoothness.
  • a paper web 1 is produced in a paper machine 2 shown only schematically and dried in a drying section 3 of the paper machine. The drying takes place so that the paper web 1 at the output 4 of the dryer section has a moisture content of at least 7%, but preferably 8 to 12%. Such a moisture of the paper web would be sufficient to be able to calender the paper web in an off-line calender 5.
  • the paper web 1 is wound in a reel 6 on a spool 7.
  • the wound on the spool 7 paper web 1 remains for a predetermined rest period on the spool 7, i. she is stored there.
  • This rest period can also be formed by the time required to transport the spool 7 from the reeling 6 to a unwind 8 in front of the calender 5.
  • the rest period is at least about 20 minutes.
  • a cross-section control of the moisture is additionally provided.
  • a sensor arrangement 9 is provided which in each case has a sensor 10 for the underside of the paper web and a sensor 11 for the upper side of the paper web 1. It is also possible to use only a single sensor, which then performs a so-called translucent measurement.
  • the sensors 10, 11 determine the moisture of the paper web or parameters of the paper web 1 correlated therewith. If the determined moisture does not correspond to a desired preset value, then there are several possibilities for changing the moisture. These possibilities can be used either alternatively or together.
  • a corresponding drying element 12a can be arranged on the opposite side of the web 1.
  • This element may, for example, be an infrared dryer or another radiation dryer which is subdivided transversely to the running direction of the paper web 1 into a plurality of sections which can be controlled individually.
  • the sections may have a relatively small extent of the order of 10 to 30 cm, so that one can thereby achieve a relatively fine resolution of the moisture in the cross machine direction. If you make the cross-profile control of moisture exclusively on the zone-controlled drying element 12, then you can dry down the moisture of the paper web 1 relatively accurately to the desired target moisture.
  • more than just the one illustrated drying element 12 may be provided.
  • Another possibility is to additionally connect the sensor arrangement 9 to a wet application unit 13 which has a first nozzle moistener 14 for the lower side and a second nozzle moistener 15 over the upper side of the paper web 1.
  • a wet application unit 13 which has a first nozzle moistener 14 for the lower side and a second nozzle moistener 15 over the upper side of the paper web 1.
  • the additional moisture is of the order of 1 to 3%, maximum 5% ,
  • the liquid used for the moisture is ejected from the nozzle dampers 14, 15 by means of pressurized gas.
  • gas one can use here steam, in particular water vapor.
  • the water vapor additionally contributes to a moistening of the surfaces of the paper web 1.
  • air is usable as gas to transport the moisture to the web 1.
  • zone-controlled drying elements 12 and a moisture applicator 13 together, if you can improve the moisture profile of the paper web 1 even more.
  • the moisture application by the moisturizing device 13 may be relatively low. It only serves to even out the moisture profile in the cross machine direction. An increase in the humidity of the paper web 1 in total is not required, because the paper web 1 has not been previously overdried.
  • the provided with a relatively uniform moisture profile transverse web 1 is, as mentioned, wound on the spool 7. In the wound state, no "large” moisture balance must take place. Accordingly, the local moisture nests that may still be present in the paper web 1 may dissolve.
  • the spool 7 is transported from the winding 6 for unwinding 8 and unwound there, so that the paper web 1 can be passed through the calender 5. Even after unwinding you can still apply moisture to the paper web 1 to equalize the moisture profile.
  • another moisturizing device 17 with two nozzle moisteners 18, 19 is provided shortly after the unwinding.
  • the moisture application device 17 is controlled as a function of a sensor arrangement 20, each having a sensor 21 for the lower side of the paper web 1 and a sensor 22 for the upper side of the paper web 1.
  • the sensor arrangement 20 forms a control circuit together with the moisture application device 17.
  • Additional moisture application devices 23, 24 can additionally be arranged in the calender in order to set the moisture content of the paper web 1 to a desired value.
  • the method described is in particular also in connection with at least one single-row drying group and / or high vacuum boxes in the dryer section interesting. Also, the use of a dilution hydrogen casserole and a Gapformers and at least one shoe press, which may optionally be equipped with at least one steam box, leads to favorable results in the calendering in the calender. 5

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  • Paper (AREA)

Claims (8)

  1. Procédé de traitement d'une bande de papier, dans lequel on sèche la bande de papier et on la fait passer à travers une calandre, dans lequel la bande est séchée à une humidité d'au moins 7%, enroulée, stockée temporairement dans l'état enroulé pendant au moins 20 minutes, déroulée et passée à travers la calandre, un réglage du profil transversal de l'humidité étant effectué par au moins un élément de séchage commandé par zones.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on effectue la régulation du profil transversal de l'humidité au moins en partie avant l'enroulement.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on augmente l'humidité de la bande de papier après le séchage de 1 à 5 pour cent et l'on effectue la régulation du profil transversal de l'humidité.
  4. Procédé selon la revendication 3, caractérisé en ce que l'on augmente l'humidité à l'aide d'un appareil d'enduction à buse entraîné par une pression de gaz.
  5. Procédé selon la revendication 4, caractérisé en ce que l'on utilise de la vapeur comme gaz d'entraînement pour l'appareil d'enduction à buse.
  6. Procédé selon la revendication 4, caractérisé en ce que l'on utilise de l'air comme gaz d'entraînement pour l'appareil d'enduction à buse.
  7. Procédé selon l'une quelconque des revendications 3 à 6, caractérisé en ce que l'on effectue l'augmentation de l'humidité après l'enroulement.
  8. Procédé selon les revendications 1 à 7, caractérisé en ce que l'on guide la bande de papier à travers la calandre sans réhumidification.
EP20040105856 2003-12-12 2004-11-18 Procédé de traitement d'une bande de papier Revoked EP1541758B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003158186 DE10358186B4 (de) 2003-12-12 2003-12-12 Verfahren zum Behandeln einer Papierbahn
DE10358186 2003-12-12

Publications (2)

Publication Number Publication Date
EP1541758A1 EP1541758A1 (fr) 2005-06-15
EP1541758B1 true EP1541758B1 (fr) 2009-01-21

Family

ID=34485342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040105856 Revoked EP1541758B1 (fr) 2003-12-12 2004-11-18 Procédé de traitement d'une bande de papier

Country Status (2)

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EP (1) EP1541758B1 (fr)
DE (2) DE10358186B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012210757A1 (de) 2012-06-25 2014-01-23 Metso Paper, Inc. Vorrichtung und Verfahren zur Bearbeitung einer Faserbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3819762A1 (de) * 1988-06-10 1989-12-14 Vib Apparatebau Gmbh Spruehkopf fuer duesenfeuchter und verfahren zum befeuchten
US5045342A (en) * 1989-01-27 1991-09-03 Measurex Corporation Independent heat moisture control system for gloss optimization
US5711087A (en) * 1996-03-22 1998-01-27 Measurex Devron Inc. Apparatus for profile control of a sheet having a removable screen
PT1105570E (pt) * 1998-07-10 2004-08-31 Metso Paper Inc Processo de fabrico de papel calandrado
FI108655B (fi) * 1999-06-17 2002-02-28 Metso Paper Inc Menetelmä rainan johtamiseksi kalanteritelanippien välillä ja kalanteri
DE10052187B4 (de) * 2000-10-20 2013-12-24 Voith Patent Gmbh Verfahren zum Glätten einer Materialbahn sowie Kalander zur Durchführung des Verfahrens
DE10205220A1 (de) * 2002-02-08 2003-08-21 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Herstellung und Behandlung einer Materialbahn

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012210757A1 (de) 2012-06-25 2014-01-23 Metso Paper, Inc. Vorrichtung und Verfahren zur Bearbeitung einer Faserbahn

Also Published As

Publication number Publication date
DE502004008905D1 (de) 2009-03-12
DE10358186A1 (de) 2005-07-21
EP1541758A1 (fr) 2005-06-15
DE10358186B4 (de) 2006-09-07

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