EP1424440B1 - Dispositif pour le traitement d'une bande avec appareil d'humidification - Google Patents

Dispositif pour le traitement d'une bande avec appareil d'humidification Download PDF

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Publication number
EP1424440B1
EP1424440B1 EP03023409A EP03023409A EP1424440B1 EP 1424440 B1 EP1424440 B1 EP 1424440B1 EP 03023409 A EP03023409 A EP 03023409A EP 03023409 A EP03023409 A EP 03023409A EP 1424440 B1 EP1424440 B1 EP 1424440B1
Authority
EP
European Patent Office
Prior art keywords
web
steam
roll
roller
housing
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 - Lifetime
Application number
EP03023409A
Other languages
German (de)
English (en)
Other versions
EP1424440A1 (fr
Inventor
Josef Schneid
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
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1424440A1 publication Critical patent/EP1424440A1/fr
Application granted granted Critical
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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

Definitions

  • the invention relates to a web treatment device, in particular calender, with at least one roller over which a web is feasible, and a steam donating moistening device, which is arranged in the direction of the web behind the roller and on the same side of the web as the roller Moistening device comprises a housing which is arranged at a distance from the roller.
  • Such a device is off EP 0 708 203 A2 known.
  • the housing of the moistening device is provided on the inlet side with a protruding in the direction of the web bar.
  • US 4,207,143 A describes a method for wetting a web which is unwound, passed through a calender and rewound. Moistening devices are arranged in front of and behind the calender.
  • WO 01/075224 A1 shows a calender behind whose first nip the web is moistened on both sides.
  • the one moistening device is arranged in a pocket which is formed by the web.
  • a paper web is usually calendered in the course of its manufacture, i. passed through a calender, and there subjected to increased pressure and elevated temperature. In many cases one also tries to even out the moisture profile of the web transversely to the running direction. For this purpose, moisture is applied to the web, and in many cases with the help of so-called steam dampers, which spend steam in the direction of the web.
  • the vapor output can be in the width direction of the web, i. be controlled zone by zone, so that some areas of the web receive more and other areas less vapor. The vapor condenses on the surface of the web, thus giving off moisture and heat to the web.
  • the invention has for its object to enable humidification at higher web speeds.
  • the web can be moistened shortly after lifting from the roller.
  • no or at least no disturbing air boundary layer has formed on the surface of the web even at higher web speeds.
  • the air boundary layer which may still be present in front of the roll has been disturbed or even eliminated by the overlay on the roll.
  • steaming the web in this state then the steam passes smoothly or with little interference on the surface of the web and can condense there.
  • the steam is for this purpose from the moistening device issued so that it reaches the web. This can be done either by directing the steam directly at the web or by directing it towards the roller. Also combinations of these possibilities are conceivable.
  • the moistening device comprises a housing which is arranged at a distance from the roller, wherein a seal is arranged between the roller and the housing, it is achieved that a space arises between the moistening device and the roller in which there is virtually no air boundary layer can train more at the track. Ingress of air into this space between the housing of the humidifier and roller is avoided by the seal. Also on the front sides of this room you can take appropriate measures to ensure that the ingress of air is prevented. After a certain period of operation, it can be assumed that this space has been filled with steam, so that the web faces a steam atmosphere as it lifts off the roller. It may therefore at best form a vapor boundary layer. However, this boundary layer causes the desired moistening of the web.
  • the housing is expediently constructed in two walls, wherein steam can also circulate between an inner wall and an outer wall. In this way it is prevented that can precipitate condensate on the outside of the outside, which would then drip on the web.
  • the moistening device has a vapor outlet directed into the drainage gusset between the roller and the web. With the help of the steam outlet you can quickly and permanently fill the space between the housing and the roller with steam. Also, a Dampfabtransport by running off the roller path does not cause air to penetrate into this room can. The vapor deposition on the web is improved.
  • the seal is attached to the housing and abuts the roller. So the roller rubs against the seal. This avoids gaps between the housing and the roller. Accordingly, a steam outlet in this area is practically impossible or only to a very small extent possible. You concentrate the vapor where you want it, on the surface of the web.
  • the seal is offset by about 90 ° to a line at which the web lifts off from the roll.
  • the arrangement of the seal is about 90 ° from the line where the web leaves the roller, a structurally relatively simple Measure to ensure good tightness. The construction costs are kept small.
  • the moistening device has an extension in the running direction of the web. This extends the exposure time of the steam to the web. This is particularly advantageous in high-speed webs to transfer enough moisture to the web.
  • the extension is designed as a cover without steam output. With this configuration, one additionally achieves that the steam delivery can be kept small in the environment. The vapor is trapped between the web and the moistening device until it is substantially completely condensed on the web.
  • the extension has a decreasing thickness in the running direction of the web across the web. Since the extension is mainly supported on the housing of the humidifier, keeping in this way the mechanical loads small.
  • roller is cooled. This causes condensate to form on the surface of the roller, which is transferred from there to the web.
  • the condensate has the advantage that it interferes with the air layer adhering to the web when it rests on the roller.
  • the web is cooled by the roller. This causes the vapor to condense even more.
  • the roller is designed as a guide roller.
  • the guide roller is located in front of a nip of a calender. There, the humidification is particularly advantageous.
  • the figure shows a trained as a calender treatment device 1 with two rollers 2, 3, which form between them a nip 4, through which a web 5, for example, a paper web, is guided.
  • the web 5 has a running direction 6.
  • the web 5 is subjected to increased pressure and usually also at an elevated temperature. This should improve the surface properties of the web.
  • a guide roller 7 is arranged, over which the web 5 is guided.
  • the wrap around the guide roller is relatively large. In the present case, it is almost 180 °. In most cases, however, the wrap angle of the web around the guide roll 7 is at least 100 °.
  • a moistening device 8 is arranged and that on the same side of the web 5, on which the guide roller 7 is arranged.
  • the moistening device 8 has a housing 9 which is arranged at a certain distance from the guide roller 7. At this distance, a seal 10 is arranged, which is fixed to the housing 9 and slidably abuts the guide roller 7. However, one can also provide a gap between the seal 10 and the guide roller 7, but this gap should be kept as small as possible.
  • the housing 9 is formed in a manner not shown double-walled with an outer wall and an inner wall, wherein in the space between the outer wall and the inner wall of steam circulates and thus heats the outer wall. This prevents condensate from precipitating on the outside wall, which may drip onto the web.
  • the housing has on its web 5 facing the bottom 11 a number of steam outlet openings 12. Another steam outlet opening 13 is directed into a space 14 between the housing 9 and the guide roller 7. The steam outlet opening 13 is preferably even directed into the outlet gusset 15 between the web 5 and the guide roller 7, so that the web 5, more precisely the moistening device 8 facing side of the web when lifting from the guide roller 7 immediately faces a steam atmosphere.
  • the seal 10 is arranged at approximately 90 ° offset from a line 16 on which the web 5 lifts off from the guide roller 7.
  • the space 14 is then bounded, so to speak, by an isosceles triangle whose base is curved because it is formed by the surface of the roller 7.
  • the seal 10 can be made substantially radially to the roller 7, so that one can easily apply the required contact pressures, without the risk that the seal 10 is damaged during operation by the guide roller 7.
  • the moistening device 8 has in the running direction 6 of the web 5 on an extension 17, which is simply designed as a cover without steam output.
  • the extension 17 allows the steam to act on the surface of the web 5 for a longer time.
  • the steam which is expelled through the steam outlet openings 12, 13 can thus condense completely or at least almost completely on the web 5. This has the additional advantage that less vapor can escape into the environment.
  • the extension 17 has in the running direction 6 of the web 5 to a decreasing thickness. This keeps the loads on the connection between extension 17 and housing 9 small.
  • the extension 17 is preferably made of a metal, which may be heated via the housing 9, in order to Avoid condensation. But also a plastic with low heat capacity and low thermal conductivity is possible.
  • the mode of action of the treatment device is as follows:
  • the guide roller 7 has additional means to disturb such a boundary layer.
  • Such means may be, for example, grooves in the surface of the guide roller, which extend for example helically outwards.
  • Such measures are known per se in connection with guide rolls. They are used to prevent lateral running of the web 5 on the guide roller 7.
  • the cooling of the guide roller 17 can be done for example by supplying cooling water.
  • the cooling has several effects.
  • condensate can increasingly form on the surface of the guide roll 7, which condensate is transferred from there to the web 5.
  • the web 5 hits when running onto the guide roller 7 on a moisture layer that may interfere with the air boundary layer.
  • the web 5 is cooled by the guide roller 7, so that the steam emerging from the openings 12, 13 can condense even more strongly on the web 5. All effects are technologically desirable and complement each other.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (8)

  1. Dispositif pour le traitement d'une bande (1), en particulier calandre, avec au moins un cylindre (7) sur lequel une bande peut être guidée, et un dispositif d'humidification (8) dégageant de la vapeur, qui est disposé après le cylindre (7) dans le sens de défilement (6) de la bande (5) et qui est disposé du même côté de la bande (5) que le cylindre (7), dans lequel le dispositif d'humidification (8) comprend un boîtier (9) qui est disposé à distance du cylindre (7), caractérisé en ce qu'un joint d'étanchéité (10) est disposé entre le cylindre (7) et le boîtier (9) et/ou le dispositif d'humidification (8) comporte une sortie de vapeur (13) dirigée vers le coin de sortie (15) entre le cylindre (7) et la bande (5).
  2. Dispositif selon la revendication 1, caractérisé en ce que le joint d'étanchéité (10) est fixé au boîtier (9) et est appliqué sur le cylindre (7).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que le joint d'étanchéité (10) est déporté d'environ 90° par rapport à une ligne (16) à laquelle la bande (5) se soulève du cylindre (7).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le dispositif d'humidification (8) comporte un prolongement (17) dans le sens de défilement de la bande (5).
  5. Dispositif selon la revendication 4, caractérisé en ce que le prolongement (17) forme un recouvrement sans émission de vapeur.
  6. Dispositif selon la revendication 5, caractérisé en ce que le prolongement (17) présente une épaisseur qui diminue dans le sens de défilement (6) de la bande (5) transversalement à la bande (5).
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le cylindre (7) est refroidi.
  8. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le cylindre (7) est un cylindre de renvoi.
EP03023409A 2002-11-29 2003-10-17 Dispositif pour le traitement d'une bande avec appareil d'humidification Expired - Lifetime EP1424440B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10255716A DE10255716B4 (de) 2002-11-29 2002-11-29 Bahnbehandlungsvorrichtung, insbesondere Kalander
DE10255716 2002-11-29

Publications (2)

Publication Number Publication Date
EP1424440A1 EP1424440A1 (fr) 2004-06-02
EP1424440B1 true EP1424440B1 (fr) 2008-01-09

Family

ID=32240511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03023409A Expired - Lifetime EP1424440B1 (fr) 2002-11-29 2003-10-17 Dispositif pour le traitement d'une bande avec appareil d'humidification

Country Status (3)

Country Link
EP (1) EP1424440B1 (fr)
AT (1) ATE383467T1 (fr)
DE (2) DE10255716B4 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012217746A1 (de) 2011-11-18 2013-05-23 Voith Patent Gmbh Presseinrichtung
DE102011086617A1 (de) 2011-11-18 2013-05-23 Voith Patent Gmbh Dampfblaskasten

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207143A (en) * 1976-10-13 1980-06-10 Westvaco Corporation Method for adding moisture to a traveling web
DE4437375C2 (de) * 1994-10-19 2000-05-25 Vib Apparatebau Gmbh Vorrichtung und Verfahren zum Befeuchten einer vorbeilaufenden Materialbahn
DE19835989C5 (de) * 1998-08-08 2010-04-01 V.I.B. Systems Gmbh Verfahren und Vorrichtung zur Online-Kalandrierung von Papier
FI20000788A0 (fi) * 2000-04-04 2000-04-04 Valmet Corp Menetelmä ja sovitelma kosteuden hallitsemiseksi monitelakalanterissa

Also Published As

Publication number Publication date
DE50308961D1 (de) 2008-02-21
DE10255716A1 (de) 2004-06-24
ATE383467T1 (de) 2008-01-15
DE10255716B4 (de) 2006-08-31
EP1424440A1 (fr) 2004-06-02

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