EP1318232B1 - Calandre et procédé pour le lissage d'une bande de papier ou carton - Google Patents

Calandre et procédé pour le lissage d'une bande de papier ou carton Download PDF

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Publication number
EP1318232B1
EP1318232B1 EP20020024065 EP02024065A EP1318232B1 EP 1318232 B1 EP1318232 B1 EP 1318232B1 EP 20020024065 EP20020024065 EP 20020024065 EP 02024065 A EP02024065 A EP 02024065A EP 1318232 B1 EP1318232 B1 EP 1318232B1
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EP
European Patent Office
Prior art keywords
web
rolls
roller
calender
roll
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.)
Expired - Fee Related
Application number
EP20020024065
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German (de)
English (en)
Other versions
EP1318232A2 (fr
EP1318232A3 (fr
Inventor
Rüdiger Dr. Kurtz
Josef Schneid
Thomas Hermsen
Udo Gabbusch
Harald Hess
Rainer Fenske
Alexander Wassermann
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 Paper Patent GmbH
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Publication date
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1318232A2 publication Critical patent/EP1318232A2/fr
Publication of EP1318232A3 publication Critical patent/EP1318232A3/fr
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Publication of EP1318232B1 publication Critical patent/EP1318232B1/fr
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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
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a calender for smoothing a paper or board web having at least two rollers which form a number of treatment nips corresponding to the number of rollers with a common jacket, which bears against the rollers under the action of support shoes. Furthermore, the invention relates to a method for smoothing a paper or board web, in which the web is passed through a plurality of treatment nips, which are formed between a common shell and a number of rollers corresponding to the number of treatment nips, wherein the web in the treatment nips with pressure is charged.
  • Such an apparatus and method are known from EP 0 188 399 A and CH-A-601686.
  • the device described therein serves to drain the web, but can also used for calendering.
  • the web is passed through three successive treatment tips, wherein the web is thereby guided between a circumferential jacket and a felt, which is placed around the respective rollers.
  • the support shoes are in this case provided with a magnet arrangement, wherein the magnet arrangement cooperates with the respectively opposite roller in order to apply the required pressure force can. Due to the felt, the web has a relatively rough surface after passing through the three treatment nips.
  • the invention is based, to broaden the treatment options of the web when smoothing the task.
  • rollers have at least two different temperatures.
  • a hotter roller serves to improve the smoothness of the web at least on one side.
  • the colder roller can be used to "freeze” an achieved condition.
  • smoothing is meant in the following the smoothness, which is achieved in a calender. This process is also referred to as "satinage”.
  • a hot roller and then a cold roller is arranged along a web path.
  • a compliant jacket by the support shoe to the Roll is pressed, creates a so-called wide nip, ie a nip with a relatively large treatment length in the range of, for example, 70 to 250 mm.
  • the jacket therefore covers a larger peripheral portion of the roller than would be the case with a nip formed by two opposing rollers. Due to the longer treatment length, a longer treatment time is of course available with otherwise unchanged conditions, so that the elevated temperature of the hot roller can act on the web over a longer period of time. This improves the surface properties of the web at least on the side which bears against the hot roll.
  • this embodiment has in some cases the advantage that the smooth surface of the web, which results in a "molten" state, in the cold nip by conditioning on the colder roller shock-like cooled and thus frozen. The state reached in the hot treatment nip is thus preserved.
  • the moisture distribution is uniformed transversely to the web running direction.
  • the jacket can be designed in different ways.
  • a relatively stiff shell which is elastic enough to adapt to the curvature of the roll, but otherwise rotates virtually in the manner of a roller.
  • This jacket can be provided with discs on the front side.
  • a less rigid band which is guided via support rollers in one circulation, wherein the deflection rollers practically define a polygon. Such a band can also be relatively thin.
  • the jacket is arranged between the rollers.
  • the jacket thus simultaneously serves as a thermal insulator between the hot roller and the cold roller. This increases the efficiency of the device because heat transfer is largely prevented by at least thermal radiation. Contributes to this, that the jacket is formed of a relatively flexible plastic, with plastics usually have a poor heat transfer property.
  • two rollers cooperate with support shoes having an opposite press direction.
  • the two support shoes work so to speak against each other and are based on each other. This simplifies the construction of the device, because you can do with weaker constructions for holding and supporting the support shoes. In addition, let the pressures in the treatment tips match each other.
  • the hot roll has a temperature of at least 100 ° C and the cold roll at a temperature of at most 60 ° C.
  • the choice of a temperature of at least 100 ° C ensures that moisture contained in the web can evaporate.
  • this embodiment has the advantage that the moisture distribution in the web is made uniform. The temperature of the cold roll ensures that the web is cooled relatively quickly and the moisture contained in the web can condense there.
  • the temperature of the hot roll in the range of 150 to 250 ° C and the temperature of the cold roll in the range of 30 to 50 ° C. These temperatures are particularly suitable.
  • the web running path runs between two treatment nips at a distance from the mantle. This prevents the web between the treatment tips rests uncontrollably on the deforming under certain circumstances coat. It is rather briefly lifted off the coat. The distance between the jacket and the web can remain small. The spacing avoids markings that could result, for example, from a swinging of the shell between the treatment nips.
  • the web rests on the surface of the rolls.
  • the surface of the rolls is therefore imaged directly onto the surface of the web, at least in the hot treatment nip. If the cold roll can freeze this condition, then the surface of the cold roll is also imaged on the web.
  • two rollers are provided which cooperate with the shell, wherein a sealing roller rests against both rollers.
  • a space is defined by the two rollers, the sealing roller and the jacket, in which a vapor pressure can build up.
  • the two rollers, the shell and the sealing roller surround a space in which a guide roller is arranged.
  • the guide roller thus serves to lift the web in the space of the shell and of the two rollers, so that the present in space steam can act on the web from both sides.
  • the object is achieved in a method of the type mentioned above in that the web is acted upon in at least two treatment tips with different temperatures.
  • the web is first heated and then cooled.
  • heating the smoothing of the surface of the web is promoted.
  • cooling the smooth surface can be frozen, so to speak.
  • cooling can prevent flash evaporation or at least mitigate its effects.
  • the jacket is used for thermal shielding between the rollers of different temperature. Heat transfer from the hot roller to the cold roller is thus largely prevented by heat radiation.
  • the web is passed through a closed space for cooling.
  • a closed space can then build up a vapor pressure, which prevents steam from the interior of the web passes outward and thus damaged the smoothed surface again.
  • the moisture contained in the web possibly in the form of vapor, may condense again in the colder nip, thus avoiding excessive drying of the web.
  • the moisture over the width of the web is greatly homogenized.
  • the first roller 3 is provided with a heater 5.
  • This heater 5 is shown only schematically.
  • the heating of the roller 3 can take place with the aid of a hot liquid, such as water or oil, or with the aid of a vapor.
  • Other ways to heat the roller for example, with heat radiation from infrared radiators or with the help of electromagnetic heaters, are also possible.
  • the heater 5 heats the surface of the rollers to a temperature in the range of 150 ° C to 250 ° C.
  • the temperature of the roller 3 should be so high as to be able to vaporize moisture in the web 2.
  • the second roller 4 is provided with a cooling device 6.
  • the cooling device 6 ensures that the temperature of the surface of the second roller 4 is at most 60 ° C, preferably, the temperature should be in a range of 30 to 50 ° C. Also for cooling, there are several options, such as the use of cooling water or cooling air.
  • a circumferential jacket 7 is arranged, which is pressed by a first support shoe 8 against the first roller 3 and by a second support shoe 9 against the second roller 4 and rotates like a roller.
  • a first nip 10 and between the shell 7 and the second roller 4 a second nip 11 is formed between the rotating jacket 7 and the first roller.
  • Both nips 10, 11 are designed as so-called broad nips or extended nips, i. they comprise a predetermined peripheral portion of the two rollers 3, 4.
  • the jacket 7 can be supported with only schematically illustrated guide rollers 12, 13 or with other aids.
  • the two support shoes 8, 9 each have a pressure surface 14, 15, whose curvature is substantially adapted to the curvature of the opposite roller 3, 4.
  • the support shoes 8, 9 may for example be hydrostatically lubricated, so that a friction between the support shoes 8, 9 and the shell 7 is reduced.
  • the jacket 7 is formed of a plastic which is flexible enough to conform in the illustrated convex shape to the outside around a peripheral portion of the two rollers 3, 4. Although the jacket 7 is here shown approximately circular except for the indentations in the area of the rollers 3, 4. This circular shape is not absolutely necessary.
  • the two support shoes 8, 9 are supported on a common carrier 16. They act in opposite directions with approximately equal force, so that the carrier 16 is substantially in equilibrium.
  • the web 2 is guided over deflection rollers 17-20 and through the two nips 10, 11.
  • the guide roller 18 is arranged so that the web 2 is lifted off the jacket 7 after leaving the first nip 10. In the nip 10 it lies with one side on the smooth, hard roller 3.
  • the guide roller 19 is arranged so that the web 2 between the two nips 10, 11 remains lifted from the jacket 7 and only in the area of the nip 11 comes to rest against the jacket 7 again. Also in the second nip 11, the web 2 is applied to the smooth, hard roller 4 and that with the same side.
  • the distance between the two nips 10, 11 is matched to the speed of the web 2, that the web enters the second nip 11 already a very short time after leaving the first nip 10, where it has been heated.
  • the time period between leaving the first nip 10 and entering the second nip 11 is in the range of a few hundredths of a second and is not sufficient for a steam outlet with disturbing consequences.
  • the hot roller 3 has such a high surface temperature that moisture still contained in the web 2 can evaporate. Preferred temperature values are in the range of 150 to 250 ° C. Before this vapor can leave the web 2 almost explosively after leaving the first nip 10, the web enters the second nip 11, where it is cooled. Of course you will not be able to prevent that some steam from the web 2 emerges. However, the exiting amount of steam is still so small that a significant disturbance of the surface of the web 2 is not associated with it.
  • the cold roll 4 has such a low surface temperature that the web 2 after leaving of the nip 11 is altogether at a temperature in which the vapor is completely condensed in the interior.
  • the distance between the first nip 10 and the second nip 11 is also so small that the web with a smooth, fused surface after heating can be directly shock-cooled and frozen, so to speak.
  • the jacket 7 shields the hot roller 3 from the cold roller 4.
  • the first roller 3 may still be surrounded by a housing or other shield, which prevents heat radiation.
  • a heat transfer between the hot roller 3 and the cold roller 4 is prevented by the jacket 7.
  • the jacket 7 is also poor thermal conductivity, so that a heat transfer is largely prevented.
  • the effected by the pulleys 18, 19 distance of the web 2 from the jacket 7 does not have to be large. It should only be prevented that the web 2 in the area between the two nips 10, 11 touches the jacket 7.
  • Fig. 2 shows another embodiment of a calender, in which parts corresponding to those of Fig. 1, are provided with the same reference numerals.
  • the press directions of the broad nips 10, 11 are at an angle of approximately 90 ° to each other.
  • the two rollers 3, 4 and the shell 7 are therefore arranged as an inverted V.
  • a sealing roller 21 is provided, which on the two rollers 3, 4 is present.
  • a space 22 is bounded, in which a guide roller 18 is arranged. If the space 22 is sealed at the front, then it is possible to build up a vapor pressure in this space 22.
  • This vapor pressure can be generated either by external means, for example by feeding steam into the space 22. However, the vapor pressure usually results more or less automatically after a short period of operation in that steam escapes from the web 2, in the hotter nip 10 has been heated.
  • a vapor pressure prevails in chamber 22 which is approximately equal to the vapor pressure in the interior of web 2, so that the vapor can no longer escape from web 2 after leaving the broad nip 10 and damage the surface.
  • the web 2 is lifted by means of the guide roller 18 from the surface of the shell 7, the steam can reach both sides of the web 2.

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  • Paper (AREA)

Claims (14)

  1. Calandre pour le lissage d'une nappe de papier ou de carton (2) comprenant au moins deux rouleaux (3, 4) qui forment avec une enveloppe commune (7), qui s'applique contre les rouleaux (3, 4) sous l'action de sabots de support (8, 9), un certain nombre de pinces de traitement (10, 11) correspondant au nombre des rouleaux (3, 4), caractérisée en ce que les rouleaux (3, 4) présentent au moins deux températures différentes.
  2. Calandre selon la revendication 1, caractérisée en ce qu'un rouleau chaud (3) est d'abord disposé le long d'un chemin d'avance de la nappe, puis un rouleau froid (4).
  3. Calandre selon la revendication 1 ou 2, caractérisée en ce que l'enveloppe (7) est disposée entre les rouleaux (3, 4).
  4. Calandre selon la revendication 3, caractérisée en ce que deux rouleaux (3, 4) coopèrent avec des sabots de support (8, 9) qui présentent une direction de pressage opposée.
  5. Calandre selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le rouleau chaud (3) présente une température d'au moins 100°C et le rouleau froid (4) une température d'au plus 60°C.
  6. Calandre selon la revendication 5, caractérisée en ce que la température du rouleau chaud (3) est comprise dans la plage de 150 à 250°C et la température du rouleau froid (4) dans la plage de 30 à 50°C.
  7. Calandre selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le chemin d'avance de la nappe s'étend entre deux pinces de traitement (10, 11) à une certaine distance de l'enveloppe (7).
  8. Calandre selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la nappe (2) s'applique sur la surface des rouleaux (3, 4).
  9. Calandre selon l'une quelconque des revendications 1 à 8, caractérisée en ce que deux rouleaux (3, 4) sont prévus et coopèrent avec l'enveloppe (7), un rouleau d'étanchéité (21) s'appliquant contre les deux rouleaux (3, 4).
  10. Calandre selon la revendication 9, caractérisée en ce que les deux rouleaux (3, 4), l'enveloppe (7) et le rouleau d'étanchéité (21) entourent un espace (22) dans lequel est disposé un rouleau directeur (18).
  11. Procédé pour le lissage d'une nappe de papier ou de carton (2), dans lequel la nappe (2) est guidée à travers plusieurs pinces de traitement (10, 11) qui sont formées entre une enveloppe commune (7) et un certain nombre de rouleaux (3, 4) correspondant au nombre des pinces de traitement (10, 11), la nappe (2) étant sollicitée avec une pression dans les pinces de traitement (10, 11), caractérisé en ce que la nappe (2) est sollicitée dans au moins deux pinces de traitement (10, 11) avec des températures différentes.
  12. Procédé selon la revendication 11, caractérisé en ce que la nappe (2) est d'abord chauffée puis refroidie.
  13. Procédé selon la revendication 11 ou 12, caractérisé en ce que l'on utilise l'enveloppe (7) pour l'isolation entre les rouleaux (3, 4) de différentes températures.
  14. Procédé selon la revendication 12, caractérisé en ce que l'on guide la nappe (2) après le chauffage à travers un espace fermé pour la refroidir.
EP20020024065 2001-11-24 2002-10-29 Calandre et procédé pour le lissage d'une bande de papier ou carton Expired - Fee Related EP1318232B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157686 2001-11-24
DE2001157686 DE10157686B4 (de) 2001-11-24 2001-11-24 Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn

Publications (3)

Publication Number Publication Date
EP1318232A2 EP1318232A2 (fr) 2003-06-11
EP1318232A3 EP1318232A3 (fr) 2003-09-10
EP1318232B1 true EP1318232B1 (fr) 2006-06-28

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ID=7706840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020024065 Expired - Fee Related EP1318232B1 (fr) 2001-11-24 2002-10-29 Calandre et procédé pour le lissage d'une bande de papier ou carton

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EP (1) EP1318232B1 (fr)
DE (2) DE10157686B4 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1540056A (en) * 1975-01-13 1979-02-07 Wiggins Teape Ltd Heat treatment of a web containing fibres of thermoplastic material
CH601686A5 (fr) * 1976-11-30 1978-07-14 Escher Wyss Ag
CA1249470A (fr) * 1985-01-08 1989-01-31 Gregory L. Wedel Presse lineaire electromagnetique a rallonge
FI74065C (fi) * 1985-10-04 1987-12-10 Waertsilae Oy Ab Kalander, t.ex. superkalander.
US5439559A (en) * 1994-02-14 1995-08-08 Beloit Technologies Heavy-weight high-temperature pressing apparatus
DE19828156A1 (de) * 1998-06-24 1999-12-30 Voith Sulzer Papiertech Patent Vorrichtung zum Glätten einer Materialbahn

Also Published As

Publication number Publication date
DE10157686A1 (de) 2003-06-12
EP1318232A2 (fr) 2003-06-11
DE10157686B4 (de) 2005-11-17
DE50207372D1 (de) 2006-08-10
EP1318232A3 (fr) 2003-09-10

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