EP1318234B1 - Procédé et calandre pour le lissage d' une bande fibreuse - Google Patents

Procédé et calandre pour le lissage d' une bande fibreuse Download PDF

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Publication number
EP1318234B1
EP1318234B1 EP20020024715 EP02024715A EP1318234B1 EP 1318234 B1 EP1318234 B1 EP 1318234B1 EP 20020024715 EP20020024715 EP 20020024715 EP 02024715 A EP02024715 A EP 02024715A EP 1318234 B1 EP1318234 B1 EP 1318234B1
Authority
EP
European Patent Office
Prior art keywords
web
steam
nip
exit
extended nip
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
EP20020024715
Other languages
German (de)
English (en)
Other versions
EP1318234A2 (fr
EP1318234A3 (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
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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1318234A2 publication Critical patent/EP1318234A2/fr
Publication of EP1318234A3 publication Critical patent/EP1318234A3/fr
Application granted granted Critical
Publication of EP1318234B1 publication Critical patent/EP1318234B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • D21G1/006—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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices

Definitions

  • the invention relates to a method for smoothing a fibrous web (see, for example, the document WO-A-900 70 27), in particular a paper or board web, in which one heats the web in a nip formed by a roller and a circumferential jacket which is pressed against the roller over a predetermined peripheral portion. Furthermore, the invention relates to a calender for treating a fibrous web, in particular a paper or board web, with a nip formed by a roller and a over a predetermined peripheral portion pressed against the roller shell, and with a heating device in the nip on the railway acts.
  • the invention has for its object to improve the smoothing result in a nip.
  • This object is achieved in a method of the type mentioned above by applying the web at the exit of the broad nip with steam.
  • steam is directed to the web under elevated pressure relative to atmospheric pressure.
  • this pressure is the same as the vapor pressure inside the web, virtually no steam will escape from the web.
  • the vapor pressure will also decrease at a certain distance from the nip in order to allow the web to cool. An increased vapor pressure immediately at the exit of the broad nip will therefore suffice.
  • the web is passed at the exit of the broad nip through a cooling zone in which a vapor pressure greater than atmospheric pressure is generated in a closed space.
  • the temperature in this room is lower than the temperature at which the web is applied in the nip.
  • the web therefore has an opportunity to lower its temperature in the cooling zone, so that after leaving the cooling zone, the risk of flash evaporation has been substantially reduced.
  • a jet of steam is directed backwards into the nip. This measure is sufficient in most cases to provide the desired vapor atmosphere at the exit of the broad nip even at an elevated pressure.
  • the steam is directed from the side onto the web which abuts the roll in the nip and holds the other side of the web over the jacket for a predetermined distance.
  • the coat then acts as a vapor barrier on its side.
  • the only requirement for this is that the jacket is impermeable to vapor or opposes the passage of steam increased resistance.
  • the side of the web, which rests against the roller in the nip is usually the hotter side, because the heating of the web in the nip takes place in most cases via the roller. Providing the steam jet or steam atmosphere at this side is enough to prevent flash evaporation or mitigate its effects.
  • the object is achieved in a calender of the type mentioned above in that at the output of the broad nip a steam applicator is arranged, which directs steam on the web.
  • the web faces the output of the broad nip of a steam atmosphere.
  • the steam atmosphere either completely inhibits vapor leakage from the web or slows down the vapor to such an extent that the surface of the web is no longer ruptured to the extent previously observed.
  • the smoothness that has received the web in the nip so at least largely maintained.
  • the vapor deposition at the exit of the wide nip is not harmful.
  • the steam application device has at least one steam jet generating device whose steam jet is directed backwards into the wide nipples.
  • the steam jet generating means may be a nozzle bar which retains the vapor, i.e., the jet. directed against the direction of the web, in the nip.
  • a vapor atmosphere is produced under a pressure slightly higher than atmospheric pressure, so that the pressure difference between the vapor inside the web and the environment is no longer too great.
  • the exit velocity of the vapor from the web depends i.a. even after this pressure difference.
  • the steam applicator is disposed on the side of the web which bears against the roller in the nip, and the jacket is guided over a predetermined distance behind the nip as a web cover.
  • the jacket thus serves on its side to prevent the escape of steam from the web.
  • the jacket is completely or at least substantially vapor-impermeable. This attribute however, it is present anyway with most of the materials used to make the sheath.
  • the steam outlet is prevented by the steam application device or at least mitigated. In this case, you only need a single-acting steam application device.
  • the steam application device has a closed space through which the web is guided.
  • the confined space which of course must have openings for the entrance and exit of the web, one can provide steam at an elevated pressure so that one can at least approximately achieve a pressure balance between the vapor inside the web and the vapor outside the web ,
  • the openings to the exit of the web one can even achieve that there is a pressure gradient in the room from the exit of the broad nip to the exit of the room. Along this pressure gradient is thus automatically a kind of cooling zone.
  • the closed space includes the roller and the shell at least partially, in particular completely.
  • the "Schuhglätttechnik" ie the wide-nip arrangement, either completely or at least partially encapsulated.
  • This has the additional advantage that the corresponding parts shell and roller can be kept at a high temperature without heat loss. This increases the profitability. In some cases, complete encapsulation is not required. Here It is then sufficient if the web is guided at the exit of the wide nip in a closed space, which encloses the shell and the roller partially.
  • the space has an exit formed by a nip.
  • a nip which is formed by rotating rollers, the sealing of the space is relatively easy. A sliding contact of the web with sealing elements, which could possibly lead to damage to the surface of the web is not required.
  • the nip is formed as a cold nip.
  • the web is cooled in the nip. This cooling can take place virtually abruptly, ie very quickly, so that the surface of the web is frozen as it were.
  • the cold nip forming rolls are simply formed without heating, i. assume a temperature which is between the temperature in the room and the temperature in the environment. In some cases, however, it may be useful to cool one or even both rolls to achieve even better cooling of the paper or board web.
  • the space has a vapor pressure control device.
  • this vapor pressure control device With this vapor pressure control device, the pressure of the steam in the room and thus the temperature in the room can be set within certain limits.
  • FIG. 1 shows a calender, also referred to as "shoe press” 1, for smoothing a paper or board web 2, which will be referred to below simply as “web”.
  • the web 2 runs in the direction of an arrow 3 through a broad nip 4, which is formed by a roller 5 and a peripheral jacket 6, which is pressed by means of a support shoe 7 over a predetermined peripheral region against the roller 5.
  • the support shoe has for this purpose a pressure surface 8, which is adapted to the curvature of the roller 5.
  • the pressure surface 8 not shown means are provided with which the contact surface between the shell 6 and the support shoe 7 can be lubricated, for example by a hydrostatic support.
  • the jacket 6 is supported by various support rollers 9, which are shown only schematically. He walks in the manner of a roller.
  • the jacket 6 is so flexible that it can adapt to the curvature of the roller 5.
  • the jacket 6 can be in different ways be educated.
  • One possibility is the use of 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.
  • Another possibility is the use of 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.
  • a heater 10 which acts on the roller 5.
  • the heater 10 transfers heat to the roller 5, so that the roller 5 is heated and can deliver a correspondingly elevated temperature to the web 2, when it passes through the nip 4.
  • the heating of the roller 5 can be done in various ways. It is on the one hand possible to supply heat only to the surface of the roller, for example by warm air, by IR radiation or by electrical or magnetic fields. But it is also possible to supply the roller 5, a heat transfer medium, for example, hot water or hot oil or steam, wherein the heat transfer medium is guided through channels in the interior of the roller 5.
  • a heat transfer medium for example, hot water or hot oil or steam, wherein the heat transfer medium is guided through channels in the interior of the roller 5.
  • the increase in temperature of the web in the nip 4 may be so great that moisture, which may still be in the web 2, evaporates. As long as the web 2 is in the nip 4, the steam remains inside the web 2, because he can not escape. This changes when the web 2 leaves the nip 4, ie at the exit 11 of the nip.
  • a Dampfsmokeds healthy 12 is provided, which in the embodiment of FIG. 1 from a first steam jet generating device 13 on the side of the web 2, which abuts the roller 5, and a second steam jet generating means 14 which on the arranged on the mantle 6 side of the web 2 is arranged.
  • the two steam jet generating devices 13, 14 each have nozzles 15, 16 which direct the steam jets 17, 18 backwards, ie against the running direction 3, into the nip 4.
  • These steam jets 17, 18 act on the web 2 at the exit 11 of the broad nip 4 and thus prevent that at the exit 11 a steam-free zone is formed, in the steam from the web 2 can escape.
  • the environment of the web 2 at the exit 11 of the broad nip 4 is saturated with steam, so that there is a vapor pressure, which inhibits the escape of vapor from the web 2 or even completely prevented.
  • the steam jets 17, 18 also provide an increased vapor pressure at the exit 11.
  • the vapor pressure here is higher than the normal atmospheric or ambient pressure.
  • the vapor pressure decreases with increasing distance from the output 11.
  • this is desirable because the web 2 cools with increasing distance from the exit 11 and thus reduces the risk that there will still be steam in the web 2 which can exit the web 2 with increased kinetic energy.
  • Fig. 2 shows a modified embodiment in which the same parts are provided with the same reference numerals.
  • Fig. 3 shows a third embodiment, wherein the same parts are provided with the same reference numerals.
  • the entire shoe press 1 is encapsulated in a housing 19.
  • the housing 19 has an inlet opening 20 for the web 2 and an outlet opening 21, which is formed by a nip between two rollers 22, 23.
  • the two rollers 22, 23 are cooled by a cooling device 24.
  • the cooling device 24 is shown only schematically. It can act on the rollers 22, 23 in different ways, for example by blowing in room air or cooled air, by introducing a cooled liquid into the rollers 22, 23 or otherwise. At the output 21, therefore, a so-called "cold nip" is formed.
  • the housing 19 further includes a vapor pressure generating means 25 which ensures that in the interior of the housing 19, a predetermined vapor pressure prevails. If necessary, a pressure sensor 26 may be provided, which acts on the vapor pressure generator 25 and thus forms a control or control circuit with which a certain vapor pressure inside the housing 19 can be maintained.
  • the web 2 is then cooled and the achieved smoothness values of the surface are "frozen", so to speak.
  • the web has a relatively smooth surface after leaving the exit 21.
  • the vapor pressure generator 25 also serves to heat the roller 5 and the shell 6 from the outside.
  • 4 shows a further embodiment of a shoe press 1, in which only one space 27 is encapsulated at the exit 11 of the wide nip 4. Shown are side walls 28, a top wall 29 and a bottom wall 30. The exit of the space 27 is again formed by a cold nip 21.
  • a further calender can be arranged behind the calender 1, in which the positions of roller 5 and jacket 5 are reversed. Leave with this combination of two calenders then provided both sides of the web 2 with approximately the same surface properties.

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Claims (14)

  1. Procédé pour le lissage d'une nappe fibreuse, notamment d'une nappe de papier ou de carton, dans lequel la nappe (2) est chauffée dans une pince allongée (4), qui est formée par un rouleau (5) et une enveloppe périphérique (6), qui est pressée sur une portion périphérique prédéterminée contre le rouleau (5), caractérisé en ce que l'on sollicite la nappe (2) à la sortie de la pince allongée (4) avec de la vapeur.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on dirige de la vapeur sous une pression accrue par rapport à la pression atmosphérique sur la nappe (2) à la sortie de la pince allongée (4).
  3. Procédé selon la revendication 2, caractérisé en ce que l'on dirige la nappe (2) à la sortie dé la pince allongée (4) à travers une zone de refroidissement dans laquelle une pression de vapeur supérieure à la pression atmosphérique est produite dans un espace fermé.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on dirige un jet de vapeur (17, 18) vers l'arrière à l'intérieur de la pince allongée (4).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on dirige la vapeur sur la nappe (2) depuis le côté qui s'applique dans la pince allongée (4) contre le rouleau (5), et l'autre côté de la nappe (2) est maintenu en appui sur une section prédéterminée contre l'enveloppe (6).
  6. Calandre pour lisser une nappe fibreuse, notamment une nappe de papier ou de carton, comprenant une pince allongée (4) formée par un rouleau (5) et une enveloppe (6) pressée contre le rouleau (5) sur une section périphérique prédéterminée, et comprenant un dispositif de chauffage qui agit sur la nappe (2) dans la pince allongée (4), caractérisée en ce qu'un dispositif d'application de vapeur (12) est disposé à la sortie (11) de la pince allongée (4) et dirige la vapeur sur la nappe (2).
  7. Calandre selon la revendication 6, caractérisée en ce que le dispositif d'application de vapeur (12) présente au moins un dispositif de production d'un jet de vapeur (13,14), dont le jet de vapeur (17, 18) est dirigé vers l'arrière dans la pince allongée (4).
  8. Calandre selon la revendication 6 ou 7, caractérisée en ce que le dispositif d'application de vapeur (12) est disposé du côté de la nappe (2) qui s'applique dans la pince allongée (4) contre le rouleau (5) et l'enveloppe (6) est guidée sous forme de recouvrement de nappe sur une distance prédéterminée derrière la pince allongée (4).
  9. Calandre selon la revendication 6 ou 7, caractérisée en ce que le dispositif d'application de vapeur (12) est disposé des deux côtés de la nappe (2).
  10. Calandre selon l'une quelconque des revendications 6 à 9, caractérisée en ce que le dispositif d'application de vapeur (12) présente un espace fermé (27) à travers lequel est guidée la nappe (2).
  11. Calandre selon la revendication 10, caractérisée en ce que l'espace fermé (27) renferme le rouleau (5) et l'enveloppe (6) au moins partiellement, notamment complètement.
  12. Calandre selon la revendication 10 ou 11, caractérisée en ce que l'espace (27) présente une sortie (21) qui est formée par une pince.
  13. Calandre selon la revendication 12, caractérisée en ce que la pince est réalisée sous forme de pince froide.
  14. Calandre selon la revendication 13, caractérisée en ce que l'espace (27) présente un dispositif de commande de la pression de vapeur (25, 26).
EP20020024715 2001-11-24 2002-11-06 Procédé et calandre pour le lissage d' une bande fibreuse Expired - Fee Related EP1318234B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157690 2001-11-24
DE2001157690 DE10157690C1 (de) 2001-11-24 2001-11-24 Verfahren und Kalander zum Glätten einer Faserstoffbahn

Publications (3)

Publication Number Publication Date
EP1318234A2 EP1318234A2 (fr) 2003-06-11
EP1318234A3 EP1318234A3 (fr) 2003-09-10
EP1318234B1 true EP1318234B1 (fr) 2006-06-21

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EP20020024715 Expired - Fee Related EP1318234B1 (fr) 2001-11-24 2002-11-06 Procédé et calandre pour le lissage d' une bande fibreuse

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EP (1) EP1318234B1 (fr)
DE (2) DE10157690C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10311993A1 (de) * 2003-03-19 2004-10-14 Voith Paper Patent Gmbh Verfahren zur Behandlung einer Faserstoffbahn
DE102004029261B4 (de) * 2004-06-17 2006-05-18 Papierfabrik August Koehler Ag Verfahren zur Herstellung eines wärmeempfindlichen Aufzeichnungsmaterials sowie ein durch das Verfahren hergestelltes Aufzeichnungsmaterial
DE102004062563A1 (de) * 2004-12-24 2006-07-06 Voith Paper Patent Gmbh Vorrichtung und Verfahren zum Behandeln einer Materialbahn
DE102005039991A1 (de) * 2005-08-23 2007-03-08 Voith Patent Gmbh Kalander

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920204A1 (de) * 1988-10-31 1990-05-10 Escher Wyss Gmbh Verfahren zum glaetten einer papier- oder kartonbahn
DE3922184A1 (de) * 1988-12-22 1990-06-28 Escher Wyss Gmbh Verfahren zum glaetten einer papierbahn
FI20000927A0 (fi) * 2000-04-18 2000-04-18 Valmet Corp Menetelmä kartonkirainan kalanteroimiseksi

Also Published As

Publication number Publication date
EP1318234A2 (fr) 2003-06-11
DE50207280D1 (de) 2006-08-03
DE10157690C1 (de) 2003-02-20
EP1318234A3 (fr) 2003-09-10

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