EP2119826A1 - Méthode et dispositif pour humidifier une bande de matière fibreuse - Google Patents

Méthode et dispositif pour humidifier une bande de matière fibreuse Download PDF

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Publication number
EP2119826A1
EP2119826A1 EP09159959A EP09159959A EP2119826A1 EP 2119826 A1 EP2119826 A1 EP 2119826A1 EP 09159959 A EP09159959 A EP 09159959A EP 09159959 A EP09159959 A EP 09159959A EP 2119826 A1 EP2119826 A1 EP 2119826A1
Authority
EP
European Patent Office
Prior art keywords
liquid
steam
web
range
dispensing device
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.)
Granted
Application number
EP09159959A
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German (de)
English (en)
Other versions
EP2119826B1 (fr
Inventor
Jörg Dr. Rheims
Lothar Dr. Zimmermann
Frank Wegehaupt
Thomas Keuerleber
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 EP2119826A1 publication Critical patent/EP2119826A1/fr
Application granted granted Critical
Publication of EP2119826B1 publication Critical patent/EP2119826B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/003—Indicating or regulating the moisture content of the layer
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting

Definitions

  • the invention relates to a method for moistening a fibrous web, in particular a paper or board web, in which first applying liquid and then steam to the fibrous web.
  • the invention further relates to a device for moistening a fibrous web, in particular a paper or board web, with a liquid dispensing device adjacent to a web running path and a steam dispensing device arranged along the web running path behind it.
  • moistening is necessary in many cases. For example, if you pass the paper web through a calender to satin it, you apply moisture to improve the calendering result. You want to do that achieve that the moisture application remains essentially on the surface of the paper web, because only there, the fibers are to be plasticized.
  • the moisture should preferably not penetrate into the interior of the paper web when passing through the nips in order to achieve a volume-saving calendering. So you want to achieve a moisture gradient and possibly also a temperature gradient.
  • Another possibility is to apply the moisture in the form of a liquid which is atomized, for example in a nozzle moistener.
  • a liquid which is atomized for example in a nozzle moistener.
  • it prepares In many cases difficulties to apply the moisture evenly in this way, since the liquid is always reflected in the form of individual drops on the surface of the paper web. In spite of fine drops, in many cases no homogeneous film is formed. This creates the risk of marks on the surface of the paper web. It takes a relatively long residence time of the liquid on the paper web before it can be introduced into a calender nip or other treatment device.
  • the invention has for its object to achieve the highest possible and low-interference moisture application.
  • This object is achieved in a method of the type mentioned in that applying the steam to the fibrous web, as long as previously applied liquid is still on the surface.
  • the first applied liquid serves as a nucleus or core for the condensation of the vapor applied thereafter, so that the condensation of the vapor is achieved largely independently of the temperature of the fibrous web.
  • the condensation heats the already applied liquid.
  • the viscosity of this liquid decreases and the surface tension is reduced, so that the applied liquid can now easily form a uniform liquid film.
  • the applied liquid acts as a heat conductor between the later applied steam and the fibrous web, so that the fibrous web can be further heated by the steam.
  • the steam at a time interval in the range of 1 ms to 200 ms, in particular in the range of 1 ms to 100 ms, after the application of the liquid.
  • This time interval is so small that it is ensured that in any case, a sufficient amount of liquid remains on the surface of the fibrous web.
  • the liquid is sufficient to condense the steam to the desired extent.
  • the vapor is applied at a spatial distance in the range from 20 mm to 2000 mm, in particular from 30 mm to 1500 mm and preferably in the range from 50 mm to 500 mm behind the application of the liquid.
  • the distance is chosen so that when applying the steam enough liquid is still present on the surface of the fibrous web to achieve the desired effect.
  • the steam is applied as long as at least 75%, in particular at least 90%, of the liquid is present on the surface of the fibrous web. In this case, well over half of the applied liquid is available to condense the vapor.
  • the liquid is heated by the steam, as already mentioned. Due to the relatively large amount of liquid, the liquid droplets that have formed on the surface of the fibrous web can then combine to form a film.
  • the liquid is applied by saturated steam or wet steam.
  • steam may be passed into a cooled or simply low temperature steam box.
  • the liquid then already has an elevated temperature, which has a positive effect on the further moistening of the fibrous web.
  • the liquid in the form of ice can be applied in the form of small ice crystals that have been previously prepared.
  • Such ice crystals become the state as a solid maintained only a relatively short time. They are converted back into a liquid very quickly by the subsequent vapor deposition. Due to the lower temperature compared to a liquid, the steam can then condense to an increased extent, so that more moisture can be introduced by steam application than otherwise.
  • the liquid at a greater distance from the fibrous web is discharged from a liquid dispenser than steam from a steam dispenser.
  • the distance between the liquid of the dispenser and the web running path is thus greater than the distance between the steam dispenser and the web running path.
  • the distance between the liquid dispensing device depends essentially on the desired quality of the spray application. The efficiency of the vapor deposition is the better, the closer the vapor dispensing device is arranged on the web running path.
  • liquid mist Preferably, it sucks off liquid mist and / or steam.
  • one avoids an exposure to the environment with liquid mist or steam.
  • the moisture contained in the liquid mist or vapor can be reused.
  • the web temperature after the vapor deposition is in the range of 80 to 100 ° C, in particular in the range of 85 to 90 ° C.
  • such high temperatures can not be realized by a pure steam application. But if you apply liquid before and then let the steam condense, then you can enter a sufficient amount of heat in the web.
  • the steam optionally serves to increase the rate of penetration by heating the web.
  • the liquid and / or the vapor is applied via slot nozzles.
  • a slot nozzle With a slot nozzle, a distance of less than 25 mm to the surface of the web can be achieved for liquid application. The distance can then just as big as when steaming, which is very advantageous when using a common housing.
  • additives can, for example, support the penetration behavior, for example by reducing the surface tension of the liquid, or by performing a coating or assisting to homogenize the liquid application or to reduce disruptive deposits.
  • the liquid used is water, at least one coating color, at least one starch solution, at least one coating chemical, polyacrylic acid and its salts with alkali metal ions, alkaline earth metal ions, polyvinyl alcohol, polyethylene glycol, polypropylene glycols, polysulfonic acids and / or long-chain organic ethers.
  • the liquid is applied in an amount in the range from 0.1 to 8 g / m 2 , in particular in the range from 0.2 to 1.5 g / m 2, based on the area of the fibrous web.
  • the liquid serves as a nucleus or condensation nucleus for the condensation of the vapor.
  • it serves as a heat conductor to transfer the heat from the steam to the surface of the fibrous web.
  • the vapor has the beneficial effect of reducing the viscosity and surface tension of the liquid so that it is easier to form a uniform film of liquid on the surface of the fibrous web. With a uniform film of liquid on the surface you can then so moistened fibrous web through a nip in lead a calender or other treatment device without having a greater risk of damage to the fibrous web.
  • the liquid dispensing device and the vapor dispensing device preferably have a common housing.
  • This housing can also be formed by the fact that the two devices are firmly connected.
  • the liquid dispensing device preferably has a vapor inlet connection. It is then possible to feed the liquid dispenser and the vapor dispenser from the same source, namely a vapor source. Such a steam source is available anyway in many paper or board mills.
  • the liquid can then be produced by cooling the liquid dispenser or otherwise maintaining it at a sufficiently low temperature.
  • the liquid is then discharged in the form of saturated or wet steam, which has the advantage that the liquid itself can already be used to heat the fibrous web.
  • the liquid dispensing device has a hot water connection. It is thus possible to supply the liquid dispensing device with already heated or heated liquid, which is then dispensed onto the fibrous web at a correspondingly high temperature.
  • the liquid dispenser may also be connected to an ice maker.
  • An ice maker turns liquid into ice, preferably in the form of small ice crystals.
  • the ice crystals are particularly capable of causing condensation of the vapor.
  • the ice crystals are melted. But this is desirable because you want to ultimately achieve a humidification of the fibrous web. Here you can apply a large amount of steam, which allows a particularly fine control.
  • the vapor dispensing device has a distance from the web travel path which is smaller than the distance of the liquid dispensing device to the web travel path.
  • the efficiency of the steam dispenser is particularly good.
  • a bigger one Spacing in the liquid dispenser makes it possible to achieve a good efficiency in the formation of a spray.
  • a suction device is provided.
  • the suction device is able to suck vapor or liquid mist, which is not absorbed by the fibrous web, and thus transported away. The environment is therefore not adversely affected.
  • the liquid dispensing device and / or the vapor dispensing device preferably has a slot nozzle arrangement.
  • a slot nozzle arrangement one can achieve a relatively small distance between the dispenser and the web, which is particularly advantageous if one wants to make liquid application and vapor deposition from a common housing out.
  • the slot nozzle is particularly advantageous for the liquid application.
  • Fig. 1 shows a device 1 for wetting a paper web 2.
  • the paper web 2 is used here as an example of a fibrous web. Instead of the paper web 2, of course, a cardboard or board web can be moistened.
  • the paper web 2 is moved in a running direction 3 shown by an arrow on the device 1 along. Where the paper web 2 is located, a web running path is assumed.
  • the device 1 has in the running direction 3, first a liquid dispensing device 4 and then a steam dispenser 5.
  • the liquid dispensing device 4 dispenses liquid in the form of spray jets 6 in the direction of the paper web 2, so that a liquid film 7 is formed.
  • the liquid film 7 must be in the area of the liquid dispensing device 4 not yet connected. He may also be there in the form of individual droplets. As soon as the liquid has arrived on the surface of the paper web 2, it begins to penetrate into the interior of the paper web 2. However, this requires a certain amount of time.
  • the paper web 2 runs during this time past the steam dispensing device 5, the steam jets 8 in the direction of the paper web 2 outputs.
  • the steam transported by the steam jets 8 comes in contact with the liquid film 7, which has a lower temperature than the steam jets 8. Accordingly, the vapor condenses here and forms a further film referred to here as "steam film” 9, which, however, mixes with the liquid film 7.
  • steam film This approach has the advantage of being able to produce a sufficiently low temperature at the surface of the paper web 2 to cause the steam to condense. Accordingly, the heat energy contained in the steam can be almost completely used to heat the paper web 2 at the surface. The steam is thus applied with a relatively high efficiency.
  • the liquid film 7 is heated by the steam. As a result, the surface tension and the viscosity of the liquid forming the liquid film 7 are reduced, so that the droplets possibly formed during the liquid application can combine to form a uniform layer. By the increased Temperature, the liquid can then penetrate more easily into the surface of the paper web, so that the moistening and heating of the paper web 2 is favored.
  • liquid and steam Due to the separate application of liquid and steam, these two media can be set independently. If the liquid dispensing device 4 and the vapor dispenser 5 are subdivided into zones perpendicular to the direction of travel 3 of the paper web, which can be controlled independently, it is possible to be able to profile the moisture across the width of the paper web. Since it is possible to set the vapor deposition and the liquid application largely independently of each other, the profiling is possible both in terms of temperature and humidity. By zonal regulation of the amount of liquid and vapor, it is possible, for example, to apply liquid to profiles that are too dry at points in the air and steam to wet points when the steam is used in a subsequent process, e.g. passing through a nip of a calender causes greater drying. This allows targeted and energy-saving moisture profiling.
  • the liquid should as far as possible to the steam order, so at least 75%, better yet at least 90%, present on the surface of the paper web 2. It should therefore only have penetrated into the paper web 2 to a small extent.
  • the liquid dispensing device 4 and the steam dispensing device are arranged as close as possible to each other, advantageously even in a common housing.
  • the spatial distance between the end of the liquid application and the start of the vapor deposition should be in the range of 20 mm to 2000 mm, in particular between 50 mm and 1500 mm and particularly preferably between 30 mm and 500 mm.
  • the time interval of the job to a moving paper web 2 should be in the range of 1 ms to 200 ms, preferably between 1 ms and 100 ms.
  • the web temperature is heated after the device 1 to temperatures in the range of 70 to 100 ° C, preferably at temperatures in the range of 80 to 90 ° C.
  • Fig. 2 shows schematically how to realize such a device.
  • the device 1 is in this case arranged in front of a nip 10, which is formed between two rollers 11, 12.
  • the liquid dispensing device 4 has a steam connection 13 and a hot water connection 14 and can be cooled in a manner not shown in detail in order to convert the introduced steam into wet or saturated steam.
  • the liquid dispensing device 4 may also simply be designed as a nozzle moistener, in which water can be atomized by air or in some other way into fine droplets.
  • the steam dispenser 5 has a steam connection 15. Incidentally, the same elements as in Fig. 1 provided with the same reference numerals.
  • the device 1 is arranged so close to the nip 10 that pass at production speed less than 0.2 s, preferably in the range of 0.2 to 0.02 s before the paper web 2 after passing by the device 1 through the nip 10 is running. In this way it is ensured that the desired moisture and temperature conditioning takes place only in the outer layers of the paper web 2.
  • Fig. 3 shows an embodiment in which the device 1 is arranged in the region of a deflection roller 16. Same elements as in the Fig. 1 and 2 are provided with the same reference numerals. It can be seen that a distance a between the liquid dispensing device 4 and the paper web 2, which rests on the surface of the guide roller 16, is greater than a portion b between the vapor dispenser 5 and the paper web 2.
  • the distance a is preferably in the range of 15 to 200 mm, in particular from 100 to 120 mm.
  • the distance b is in the range of 10 to 100 mm, in particular in the range of 15 to 25 mm.
  • the distance a depends mainly on the desired quality of the spray application.
  • liquid dispensing device 4 and the vapor dispenser 5 have a common housing. At the entrance of the liquid dispensing device 4, a bulkhead 17 is still arranged.
  • a hot air outlet 18 or another possibility for heating the paper web 2 can additionally be provided. Subsequently, if necessary, still a solid application 19 may be provided.
  • a suction device 20 can also be arranged.
  • the suction device 20 may also, as indicated by arrows 21, unfold their effect in the region of the liquid dispensing device 4, so that there spray mist, which is not absorbed by the paper web 2, is sucked out.
  • Fig. 4 shows a similar embodiment, in which the only difference is that the device 1 is arranged in the region of a free web tension.
  • the liquid dispenser 4 is not curved.
  • Fig. 5 shows an embodiment in which the device 1 is arranged above the paper web 2 at least in the region of the liquid application.
  • the paper web 2 facing side of the steam dispenser 5 is curved, so that there is a substantially uniform Spampfungsspalt.
  • the liquid can also be applied in the form of solid, ie in the form of ice crystals.
  • the liquid dispensing device 4 is then connected to an ice generating device, not shown, which continuously produces ice crystals.
  • the ice crystals reduce the temperature of the surface of the paper web 2 to a particular extent, so that subsequently the steam transported up with the steam jets 8 can condense particularly well.
  • Fig. 6 schematically shows the formation of nozzles of the device 1.
  • first slot nozzles 22 and in the vapor dispensing device 5 second slot nozzles 23.
  • a distance t1 between the last in web direction 3 slot nozzle 22 for liquid and the first slot in the direction of web 3 23 for steam chosen to be in the range of 20 mm to 2000 mm, especially in the range of 30 mm to 500 mm and especially preferably in the range of 50 to 500 mm.
  • the paper web 2 requires a time in the range of 1 ms to 200 ms, in particular from 1 ms to 100 ms, to get from the last slot 22 to the first slot 23.
  • the liquid used is preferably water, which may also be provided with additives in order to support the penetration behavior.
  • the amount of liquid is preferably in the range of 0.1 to 8 g / m 2 , preferably 0.5 to 2.5 g / m 2 . In this case, one uses an amount of liquid from 2 to 2000 1 / h, preferably between 5 and 300 1 / h per meter width of the paper web. 2
  • the liquid is preferably atomized in two-substance nozzles by means of a gas, ie air or steam.
  • Preferred pressures for the sputtering gas are in the range of 5 kPa to 300 kPa, preferably in the range of 10 kPa to 100 kPa.
  • the amount of atomizing gas may be in the range of 100 to 2000 m 3 / h, preferably in the range of 150 m 3 / h and 400 m 3 / h per meter of web width.
  • the steam for vapor deposition should preferably have a temperature in the range of 115 to 135 ° C when entering the device 1.
  • the steam should have a vapor pressure of 1.2 to 2.0 bar absolute, preferably in the range of 1.2 to 1.5 bar absolute.
  • the steam is used in an amount of 0.2 to 5 g / m 2 , preferably in the range of 0.5 to 2.5 g / m 2 .
  • the liquid dispenser 4 and the vapor dispenser 5 may be constructed zonal, each zone being separately controllable.
  • the zone width for the liquid application is preferably in the range of 15 mm to 100 mm. A zone width of 20 mm or less is preferred.
  • the zone width for the vapor deposition is in the range of 50 to 300 mm, preferably in the range of 50 mm to 100 mm.
  • the device 1 is preferably used in a calender.
  • the liquid application should begin in a range of 0.02 s to 0.20 s in front of the nip 10, preferably in a range of 0.029 s to 0.14 s in front of the nip 10.

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  • Paper (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP09159959A 2008-05-16 2009-05-12 Méthode et dispositif pour humidifier une bande de matière fibreuse Not-in-force EP2119826B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008023924A DE102008023924A1 (de) 2008-05-16 2008-05-16 Verfahren und Vorrichtung zum Befeuchten einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2119826A1 true EP2119826A1 (fr) 2009-11-18
EP2119826B1 EP2119826B1 (fr) 2011-01-26

Family

ID=40792628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09159959A Not-in-force EP2119826B1 (fr) 2008-05-16 2009-05-12 Méthode et dispositif pour humidifier une bande de matière fibreuse

Country Status (3)

Country Link
EP (1) EP2119826B1 (fr)
AT (1) ATE497059T1 (fr)
DE (2) DE102008023924A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876206B1 (fr) 2013-11-21 2018-10-10 Valmet Technologies, Inc. Procédé de produktion de bandes de fibres et ligne de fabrication de bandes de fibres

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922407A (en) 1996-08-26 1999-07-13 Voith Sulzer Papiermaschinen Gmbh Method and an apparatus for the application of a liquid or pasty medium onto a moving material web
US6187142B1 (en) 1997-10-24 2001-02-13 Voith Sulzer Papiertechnik Patent Gmbh Process and device for acting on a paper or cardboard web with one of a fluid and pasty coating medium
US6207020B1 (en) * 1998-05-12 2001-03-27 International Paper Company Method for conditioning paper and paperboard webs
US6248407B1 (en) 1998-05-07 2001-06-19 Voith Sulzer Papiertechnik Gmbh Method for applying a coating medium onto a moving surface
US6274001B1 (en) 1997-10-21 2001-08-14 International Paper Company Method for calendering surface sized paper/paperboard to improve smoothness
EP0979897B1 (fr) 1998-08-08 2003-11-12 V.I.B. Systems GmbH Procédé et dispositif pour la fabrication de papier online
DE102005031445A1 (de) 2005-07-04 2007-01-11 Voith Patent Gmbh Verfahren zum Behandeln einer Bahn aus Faserstoff und Kalander

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5922407A (en) 1996-08-26 1999-07-13 Voith Sulzer Papiermaschinen Gmbh Method and an apparatus for the application of a liquid or pasty medium onto a moving material web
US6274001B1 (en) 1997-10-21 2001-08-14 International Paper Company Method for calendering surface sized paper/paperboard to improve smoothness
US6187142B1 (en) 1997-10-24 2001-02-13 Voith Sulzer Papiertechnik Patent Gmbh Process and device for acting on a paper or cardboard web with one of a fluid and pasty coating medium
US6248407B1 (en) 1998-05-07 2001-06-19 Voith Sulzer Papiertechnik Gmbh Method for applying a coating medium onto a moving surface
US6207020B1 (en) * 1998-05-12 2001-03-27 International Paper Company Method for conditioning paper and paperboard webs
EP0979897B1 (fr) 1998-08-08 2003-11-12 V.I.B. Systems GmbH Procédé et dispositif pour la fabrication de papier online
DE102005031445A1 (de) 2005-07-04 2007-01-11 Voith Patent Gmbh Verfahren zum Behandeln einer Bahn aus Faserstoff und Kalander

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876206B1 (fr) 2013-11-21 2018-10-10 Valmet Technologies, Inc. Procédé de produktion de bandes de fibres et ligne de fabrication de bandes de fibres

Also Published As

Publication number Publication date
ATE497059T1 (de) 2011-02-15
EP2119826B1 (fr) 2011-01-26
DE102008023924A1 (de) 2009-11-19
DE502009000342D1 (de) 2011-03-10

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